+++ /dev/null
- 2/14/2011
- ---------
-[bash-4.2 released]
-
- 2/15
- ----
-lib/glob/gmisc.c
- - fix wmatchlen and umatchlen to avoid going past the end of the
- string on an incomplete bracket expression that ends with a
- NUL. Partial fix for bug reported by Clark Wang <dearvoid@gmail.com>
-
- 2/16
- ----
-subst.h
- - new string extract flag value: SX_WORD. Used when calling
- extract_dollar_brace_string to skip over the word in
- ${param op word} from parameter_brace_expand
-
-subst.c
- - change parameter_brace_expand to add SX_WORD to flags passed to
- extract_dollar_brace_string
- - change parameter_brace_expand to use SX_POSIXEXP for all non-posix
- word expansion operators that treat single quotes as special, not
- just % and #
- - change extract_dollar_brace_string to initialize dolbrace_state to
- DOLBRACE_WORD if SX_WORD flag supplied and we shouldn't use
- DOLBRACE_QUOTE. Fixes bug reported by Juergen Daubert <jue@jue.li>
-
-doc/{bash.1,bashref.texi}
- - document the exact expansions here strings undergo
-
- 2/17
- ----
-lib/readline/vi_mode.c
- - make sure that `dd', `cc', and `yy' call vidomove_dispatch from
- rl_domove_read_callback. Fixes bug reported by Clark Wang
- <dearvoid@gmail.com>
-
-lib/readline/callback.c
- - make sure _rl_internal_char_cleanup is called after the
- vi-motion callbacks (rl_vi_domove_callback) in rl_callback_read_char.
- Companion to above fix
-
-doc/{bash.1,bashref.texi}
- - make sure that the text describing the rhs of the == and =~
- operators to [[ states that only the quoted portion of the pattern
- is matched as a string
-
- 2/18
- ----
-lib/glob/gmisc.c
- - better fix for umatchlen/wmatchlen: keep track of the number of
- characters in a bracket expression as the value to increase
- matchlen by if the bracket expression is not well-formed. Fixes
- bug reported by Clark Wang <dearvoid@gmail.com>
-
-subst.c
- - change expand_string_for_rhs so that it sets the W_NOSPLIT2 flag
- in the word flags. We will not perform word splitting or quote
- removal on the result, so we do not want to add quoted nulls if
- we see "" or ''. Fixes bug reported by Mike Frysinger
- <vapier@gentoo.org>
-
- 2/19
- ----
-variables.c
- - new function, int chkexport(name), checks whether variable NAME is
- exported and remakes the export environment if necessary. Returns
- 1 if NAME is exported and 0 if not
- - call chkexport(name) to get tzset to look at the right variable in
- the environment when modifying TZ in sv_tz. Don't call tzset if
- chkexport doesn't indicate that the variable is exported
-
-variables.h
- - new extern declaration for chkexport
-
-
-{parse.y,builtins/printf.def}
- - call sv_tz before calling localtime() when formatting time strings
- in prompt strings or using printf. Fixes bug reported by
- Dennis Williamson <dennistwilliamson@gmail.com>
-
-execute_cmd.c
- - modify fix of 2/9 to add casts when those variables are passed to
- functions; some compilers throw errors instead of warnings. Report
- and fix from Joachim Schmitz <jojo@schmitz-digital.de>
-
-support/shobj-conf
- - add a stanza for nsk on the Tandem from Joachim Schmitz
- <jojo@schmitz-digital.de>
-
-{shell,lib/readline/shell}.c
- - Tandem systems should use getpwnam (getlogin()); for some reason
- they don't do well with using getuid(). Fix from Joachim Schmitz
- <jojo@schmitz-digital.de>
-
- 3/1
- ---
-variables.c
- - make sure that the return value from find_variable is non-null
- before trying to use it in chkexport. Fixes bug reported by
- Evangelos Foutras <foutrelis@gmail.com>
-
- 3/3
- ---
-parse.y
- - when adding $$ to the current token buffer in read_token_word(),
- don't xmalloc a buffer for two characters and then strcpy it, just
- copy the characters directly into the token buffer. Fix from
- Michael Whitten <mfwitten@gmail.com>
-
-execute_cmd.c
- - fix expand_word_unsplit to add the W_NOSPLIT2 flag to the word to
- be expanded, so "" doesn't add CTLNUL. Similar to fix of 2/18 to
- expand_string_for_rhs. Fixes bug reported by Nathanael D. Noblet
- <nathanael@gnat.ca> and Matthias Klose <doko@debian.org>
-
-parse.y
- - fix extended_glob case of read_token_word to allocate an extra
- space in the buffer for the next character read after the extended
- glob specification if it's a CTLESC or CTLNUL. Report and fix from
- Michael Witten <mfwitten@gmail.com>
- - fix shell expansions case of read_token_word to allocate an extra
- space in the buffer for the next character read after the shell
- expansion if it's a CTLESC or CTLNUL. Report and fix from
- Michael Witten <mfwitten@gmail.com>
- - TENTATIVE: fix read_token_word to reduce the amount of buffer space
- required to hold the translated and double-quoted value of $"..."
- strings. Report and fix from Michael Witten <mfwitten@gmail.com>
- - change code around got_character and got_escaped_character labels to
- make sure that we call RESIZE_MALLOCED_BUFFER before adding the
- CTLESC before a CTLESC or CTLNUL, and before adding the character if
- we're not adding a CTLESC. Report and fix from
- Michael Witten <mfwitten@gmail.com>
-
-subst.c
- - new param flags value, PF_ASSIGNRHS, mirrors W_ASSIGNRHS, noting that
- parameter expansion is on rhs of assignment statement. That inhibits
- word splitting
- - change param_expand to call string_list_dollar_at with quoted == 1
- if PF_ASSIGNRHS is set, so it will quote IFS characters in the
- positional parameter before separating them with the first char of
- $IFS. This keeps the rhs from being split inappropriately. Fixes
- bug reported by Andres Perera <andres.p@zoho.com>
-
- 3/4
- ---
-lib/readline/bind.c
- - add a missing free of `names' in rl_function_dumper. Bug report
- and fix from Michael Snyder <msnyder@vmware.com>
-
- 3/5
- ---
-lib/readline/rltty.c
- - change rl_deprep_terminal so it uses fileno (stdin) for the tty fd
- if rl_instream is not set, like rl_prep_terminal
-
- 3/6
- ---
-lib/readline/display.c
- - fix rl_message to use a dynamically-allocated buffer instead of a
- fixed-size buffer of 128 chars for the `local message prompt'. Bug
- report and fix from Micah Cowan <micah@cowan.name>
-
- 3/7
- ---
-jobs.c
- - add sentinel to wait_sigint_handler so it only sets wait_sigint_received
- if waiting_for_child is non-zero; otherwise, it restores the old
- SIGINT handler and sends itself the SIGINT
- - set waiting_for_child around the calls to waitchld that use it to
- synchronously wait for a process
- - change logic that decides whether or not the child process blocked
- or handled SIGINT based on whether or not waitpid returns -1/EINTR
- and the shell receives a SIGINT and the child does not exit. If
- the child later exits due to SIGINT, cancel the assumoption that it
- was handled
- - instead of testing whether or not the child exited due to SIGINT
- when deciding whether the shell should act on a SIGINT it received
- while waiting, test whether or not we think the child caught
- SIGINT. If it did, we let it go (unless the shell has it trapped);
- if it did not catch it, the shell acts on the SIGINT. Fix from
- Linus Torvalds <torvalds@linux-foundation.org>, bug report originally
- from Oleg Nesterov <oleg@redhat.com>
-
- 3/8
- ---
-shell.c
- - initialize no_line_editing to 1 if READLINE is not defined -- we
- can't have line editing without readline
-
- 3/12
- ----
-lib/readline/signals.c
- - add SIGHUP to the set of signals readline handles
-
-lib/readline/doc/rltech.texi
- - document that SIGHUP is now part of the set of signals readline
- handles
-
-lib/readline/input.c
- - if _rl_caught_signal indicates that read() was interrupted by a
- SIGHUP or SIGTERM, return READERR or EOF as appropriate
- - call rl_event_hook, if it's set, if call to read in rl_getc
- returns -1/EINTR. If rl_event_hook doesn't do anything, this
- continues the loop as before. This handles the other fatal
- signals
-
-execute_cmd.c
- - add a couple of QUIT; calls to execute_disk_command and
- execute_simple_command to improve responsiveness to interrupts
- and fatal signals
-
-input.c
- - rearrange getc_with_restart so that the return values from read()
- are handled right
-
-parse.y
- - don't need to set terminate_immediately in yy_stream_get, since
- getc_with_restart checks for terminating signals itself
- - since readline returns READERR on SIGHUP or SIGTERM, don't need
- to set terminate_immediately. Still doesn't handle other
- signals well -- will have to check that some more
-
-bashline.c
- - new function, bash_event_hook, for rl_event_hook. Just checks for
- terminating signals and acts on them using CHECK_TERMSIG.
- - set rl_event_hook to bash_event_hook
-
-builtins/read.def
- - take out setting terminate_immediately; add calls to CHECK_TERMSIG
- after read calls
-
-doc/{bash.1,bashref.texi}
- - move the text describing the effect of negative subscripts used to
- reference indexed array elements to the paragraphs describing
- ${parameter[subscript]}, since that's where they are implemented.
- Pointed out by Christopher F. A. Johnson <cfajohnson@gmail.com>
-
-arrayfunc.[ch],subst.c
- - array_expand_index now takes a new first argument: a SHELL_VAR *
- of the array variable being subscripted. Can be used later to fully
- implement negative subscripts
-
- 3/14
- ----
-lib/glob/glob.c
- - fix mbskipname to not turn the directory entry name into a wide char
- string if the conversion of the pattern to a wide char string fails
- - fix mbskipname to call skipname if either the pattern or the filename
- can't be converted into a wide-char string
-
-lib/glob/xmbsrtowcs.c
- - fix xdupmbstowcs2 to handle return value of 0 from mbsnrtowcs and
- short-circuit with failure in that case. Fixes bug reported by
- Roman Rakus <rrakus@redhat.com>
-
- 3/15
- ----
-bashline.c
- - new variable, bash_filename_quote_characters to store the value
- assigned to rl_filename_quote_characters so it can be restored
- if changed.
- - change bashline_reset and attempt_shell_completion to restore
- rl_filename_quote_characters if not set to default
-
- 3/22
- ----
-lib/glob/glob.c
- - wdequote_pathname falls back to udequote_pathname if xdupmbstowcs
- fails to convert the pathname to a wide-character string
-
-lib/glob/xmbsrtowcs.c
- - xdupmbstowcs2: change to fix problem with leading '\\' (results in
- nms == 0, which causes it to short-circuit with failure right
- away). Fixes bug pointed out by Werner Fink <werner@suse.de>
- - xdupmbstowcs2: compensate for mbsnrtowcs returning 0 by taking the
- next single-byte character and going on
- - xdupmbstowcs2: change memory allocation to increase by WSBUF_INC
- bytes; try to avoid calls to realloc (even if they don't actually
- result in more memory being allocated)
-
- 3/24
- ----
-doc/{bash.1,bashref.texi}
- - slightly modify BASH_SUBSHELL description based on complaint from
- Sam Liddicott <sam@liddicott.com>
-
- 3/25
- ----
-trap.c
- - change free_trap_strings to not call free_trap_string for signals
- that are being ignored, like reset_or_restore_signal_handlers.
- Fixes bug reported by Satoshi Takahashi <blue3waters@gmail.com>
-
- 3/26
- ----
-lib/readline/rltypedefs.h
- - remove old Function/VFunction/CPFunction/CPPFunction typedefs as
- suggested by Tom Tromey <tromey@redhat.com>
-
-lib/readline/rlstdc.h
- - move defines for USE_VARARGS/PREFER_STDARG/PREFER_VARARGS from
- config.h.in to here because declaration of rl_message in
- readline.h uses the defines. This makes it hard for another packages
- to use after the header files are installed, since config.h is not
- one of the installed files. Suggested by Tom Tromey
- <tromey@redhat.com>
-
- 3/27
- ----
-print_cmd.c
- - change indirection_string from a static buffer to a dynamic one
- managed by indirection_level_string(), so we don't end up truncating
- PS4. Suggested by Dennis Williamson <dennistwilliamson@gmail.com>
-
-lib/readline/shell.c
- - change sh_set_lines_and_columns to use static buffers instead of
- allocating the buffers to pass to setenv/putenv
-
-lib/readline/terminal.c
- - change _rl_get_screen_size to not call sh_set_lines_and_columns if
- ignore_env == 0
- - _rl_sigwinch_resize_terminal: new function to just retrieve terminal
- size, ignoring environment
-
-lib/readline/rlprivate.h
- - new external declaration for _rl_sigwinch_resize_terminal() (currently
- unused)
-
-lib/readline/signals.c
- - rl_sigwinch_handler: set _rl_caught_signal to SIGWINCH
- - rl_sigwinch_handler: don't immediately call rl_resize_terminal; just
- leave _rl_caught_signal set for RL_CHECK_SIGNALS to handle
- - _rl_signal_handler: call rl_resize_terminal if sig == SIGWINCH.
- Should fix hang when sending multiple repeated SIGWINCH reported by
- Henning Bekel <h.bekel@googlemail.com>
-
- 3/29
- ----
-lib/sh/snprintf.c
- - include math.h for any defines for isinf/isnan
- - use code from gnulib documentation to implement isinf/isnan if they
- are not defined
-
-configure.in
- - don't check for isinf or isnan; c99 says they're macros anyway
-
-config.h.in
- - remove defines for ISINF_IN_LIBC and ISNAN_IN_LIBC, no longer used
- by snprintf.c
-
- 4/2
- ---
-braces.c
- - brace_gobbler: fix to understand double-quoted command substitution,
- since the shell understands unquoted comsubs. Fixes bug reported
- by Michael Whitten <mfwitten@gmail.com>
-
-lib/readline/display.c
- - include <pc.h> on MDOS
- - get and set screen size using DJGPP-specific calls on MSDOS
- - move cursor up clear screen using DJGPP-specific calls
- - don't call tputs on DJGPP; there is no good terminfo support
-
-lib/readline/terminal.c
- - include <pc.h> on MDOS
- - get and set screen size using DJGPP-specific calls on MSDOS
- - use DJGPP-specific initialization on MSDOS, zeroing all the
- _rl_term_* variables
- - don't call tputs on DJGPP; there is no good terminfo support
- DJGPP support from Eli Zaretskii <eliz@gnu.org>
-
- 4/6
- ---
-
-config-top.h
- - change DEFAULT_PATH_VALUE to something more useful and modern
-
- 4/8
- ---
-tests/printf2.sub
- - make sure LC_ALL and LC_CTYPE are set so LANG assignment takes effect.
- Reported by Cedric Arbogast <arbogast.cedric@gmail.com>
-
- 4/11
- ----
-include/chartypes.h
- - fix a couple of dicey defines (though ones that don't cause any
- compiler warnings) in IN_CTYPE_DOMAIN
-
-doc/{bashref.texi,bash.1}
- - add note referring to duplicating file descriptors in sections
- describing redirecting stdout and stderr and appending to stdout
- and stderr. Suggested by Matthew Dinger <mdinger.bugzilla@gmail.com>
-
-pcomplete.c
- - it_init_helptopics: new function to support completing on help topics,
- not just builtins
- - it_helptopics: new programmable completion list of help topics
- - build list of helptopic completions in gen_action_completions on
- demand
-
-pcomplete.h
- - new extern declaration for it_helptopics
-
-builtins/complete.def
- - the `helptopic' action now maps to CA_HELPTOPIC intead of CA_BUILTIN,
- since there are more help topics than just builtins. Suggested by
- Clark Wang <dearvoid@gmail.com>
-
- 4/12
- ----
-print_cmd.c
- - fix print_arith_for_command to add a call to PRINT_DEFERRED_HEREDOCS
- before ending the body of the command, so heredocs get attached to
- the right command instead of to the loop. From gentoo bug 363371
- http://bugs.gentoo.org/show_bug.cgi?id=363371
-
-execute_cmd.c
- - change coproc_pidchk to unset the appropriate shell variables when
- the (currently single) known coproc pid terminates
- - cleanup and new functions to fully support multiple coprocesses when
- and if I decide to go there
-
- 4/13
- ----
-print_cmd.c
- - fix print_group_command to add a call to PRINT_DEFERRED_HEREDOCS
- after call to make_command_string_internal before printing closing
- `}'
- - fix make_command_string_internal to add a call to
- PRINT_DEFERRED_HEREDOCS after recursive call to
- make_command_string_internal in case cm_subshell before printing
- closing `)'
-
- 4/14
- ----
-print_cmd.c
- - change overlapping strcpy in named_function_string to memmove
-
-sig.h
- - UNBLOCK_SIGNAL: convenience define, same as UNBLOCK_CHILD, just
- restores an old signal mask
-
-trap.c
- - set_signal: instead of setting the signal handler to SIG_IGN while
- installing the new trap handler, block the signal and unblock it
- after the new handler is installed. Fixes bug reported by Roman
- Rakus <rrakus@redhat.com>
-
- 4/15
- ----
-doc/{bash.1,bashref.texi}
- - make it clear that enabling monitor mode means that all jobs run in
- separate process groups
-
- 4/18
- ----
-builtins/fc.def
- - update fix of 4/15/2010 to not take saved_command_line_count into
- account when stepping down the history list to make sure that
- last_hist indexes something that is valid. Fixes bug reported by
- <piuma@piumalab.org>
-
- 4/19
- ----
-builtins/fc.def
- - fc_gethnum: make sure the calculation to decide the last history
- entry is exactly the same as fc_builtin. Fixes bug uncovered by
- fix of 4/18 to stop seg fault
-
- 4/22
- ----
-lib/readline/terminal.c
- - change _rl_enable_meta_key to set a flag indicating that it sent the
- enable-meta sequence
- - _rl_disable_meta_key: new function to turn off meta mode after we
- turned it on with _rl_enable_meta_key
-
-lib/readline/rlprivate.h
- - extern declaration for _rl_disable_meta_key
-
-configure.in
- - if not cross-compiling, set CFLAGS_FOR_BUILD from any CFLAGS inherited
- from the environment. Fixes HP/UX build problem reported by
- "Daniel Richard G." <skunk@iSKUNK.ORG>
-
- 4/26
- ----
-config-top.h
- - define MULTIPLE_COPROCS to 0 so the code is still disabled but easy
- to enable via configure option or editing this file
-
- 4/29
- ----
-lib/sh/eaccess.c
- - freebsd provides faccessat, with the same misfeature as their eaccess
- and access implementations (X_OK returns true for uid==0 regardless
- of the actual file permissions), so reorganize code to check the
- file permissions as with eaccess. Report and fix from Johan Hattne
- <johan.hattne@utsouthwestern.edu>
-
- 5/2
- ---
-doc/{bash.1,bashref.texi}
- - add forward reference to `Pattern Matching' from `Pathname
- Expansion', suggested by Greg Wooledge <wooledg@eeg.ccf.org>
-
- 5/5
- ---
-pcomplib.c
- - the bash_completion project now distributes over 200 completions
- for various programs, with no end in sight, so increase the value
- of COMPLETE_HASH_BUCKETS from 32 to 128
-
-pathexp.c
- - quote_string_for_globbing: make sure CTLESC quoting CTLESC is
- translated into \<CTLESC> even if the flags include QGLOB_REGEXP.
- We don't want to process the second CTLESC as a quote character.
- Fixes bug reported by Shawn Bohrer <sbohrer@rgmadvisors.com>
-
- 5/6
- ---
-builtins/printf.def
- - change PRETURN to not call fflush if ferror(stdout) is true
- - if a call to one of the stdio functions or printstr leaves
- ferror(stdout) true, and PRETURN is going to be called, let PRETURN
- print the error message rather than doubling up the messages. Fixes
- problem reported by Roman Rakus <rrakus@redhat.com>
-
- 5/9
- ---
-doc/{bash.1,bashref.texi}
- - add note to the effect that lists inside compound command can be
- terminated by newlines as well as semicolons. Suggested by
- Roman Byshko <rbyshko@gmail.com>
-
- 5/10
- ----
-subst.c
- - remove_quoted_nulls: fix problem that caused it to skip over the
- character after a CTLNUL, which had the effect of skipping every
- other of a series of CTLNULs. Fixes bug reported by
- Marten Wikstrom <marten.wikstrom@keystream.se>
-
- 5/11
- ----
-subst.c
- - extract_process_subst: add SX_COMMAND flag to call to
- extract_delimited_string, since we're expanding the same sort of
- command as command substitution. Fixes bug reported in Ubuntu
- bug 779848
-
- 5/12
- ----
-configure.in
- - set the prefer_shared and prefer_static variables appropriately
- depending on the value of $opt_static_link
-
-aclocal.m4
- - AC_LIB_LINKFLAGS_BODY: change to not prefer shared versions of the
- libraries it's searching for if the prefer_shared variable is "no".
- Fixes problem reported by Cedric Arbogast <arbogast.cedric@gmail.com>
-
- 5/13
- ----
-lib/readline/readline.c
- - _rl_internal_teardown: add call to _rl_disable_meta_key to make the
- meta key active only for the duration of the call to readline()
- - _rl_internal_setup: move call to _rl_enable_meta_key here from
- readline_initialize_everything so the meta key is active only for
- the duration of the call to readline(). Suggestion from Miroslav
- Lichvar <mlichvar@redhat.com>
-
-builtins/help.def
- - help_builtin: change strncmp to strcmp so that `help read' no longer
- matches `readonly'. Suggested by Clark Wang <dearvoid@gmail.com>
-
-config.h.in
- - add define for GLIBC21, checked using jm_GLIBC21 as part of the tests
- for libintl
-
-lib/malloc/malloc.c
- - internal_free: don't use the cached value of memtop when deciding
- whether or not to adjust the break and give memory back to the kernel
- when using the GNU C library, since glibc uses sbrk for its own
- internal purposes. From Debian bug 614815, reported by Samuel
- Thibault <samuel.thibault@gnu.org>
-
-aclocal.m4
- - BASH_STRUCT_WEXITSTATUS_OFFSET: change AC_RUN_IFELSE to AC_TRY_RUN
- to avoid warning about not using AC_LANG_SOURCE
-
- 5/14
- ----
-bashline.[ch]
- - two new functions, bashline_set_event_hook and bashline_reset_event_hook,
- to set rl_event_hook to bash_event_hook and back to NULL, respectively
- - don't set rl_event_hook unconditionally
-
-sig.c
- - termsig_sighandler: if the shell is currently interactive and
- readline is active, call bashline_set_event_hook to cause
- termsig_handler to be called via bash_event_hook when the shell
- returns from the signal handler
-
- 5/15
- ----
-lib/readline/display.c
- - _rl_col_width: Mac OS X has a bug in wcwidth: it does not return 0
- for UTF-8 combining characters. Added workaround dependent on
- MACOSX. Fixes problem pointed out by Thomas De Contes
- <d.l.tDecontes@free.fr>
-
- 5/16
- ----
-lib/readline/rlmbutil.h
- - WCWIDTH: wrapper for wcwidth that returns 0 for Unicode combining
- characters on systems where wcwidth is broken (e.g., Mac OS X).
-
-lib/readline/{complete,display,mbutil}.c
- - use WCWIDTH instead of wcwidth
-
- 5/17
- ----
-lib/readline/display.c
- - update_line: after computing ofd and nfd, see whether the next
- character in ofd is a zero-width combining character. If it is,
- back ofd and nfd up one, so the base characters no longer compare
- as equivalent. Fixes problem reported by Keith Winstein
- <keithw@mit.edu>
-
-lib/readline/nls.c
- - _rl_utf8locale: new flag variable, set to non-zero if the current
- locale is UTF-8
- - utf8locale(): new function, returns 1 if the passed lspec (or the
- current locale) indicates that the locale is UTF-8. Called from
- _rl_init_eightbit
-
-lib/readline/rlprivate.h
- - extern declaration for _rl_utf8locale
-
-locale.c
- - locale_utf8locale: new flag variable, set to non-zero if the current
- locale is UTF-8 (currently unused)
- - locale_isutf8(): new function, returns 1 if the passed lspec (or the
- current locale) indicates that the locale is UTF-8. Should be called
- whenever the locale or LC_CTYPE value is modified
-
-aclocal.m4
- - BASH_WCWIDTH_BROKEN: new test for whether or not wcwidth returns
- zero-width characters like unicode combining characters as having
- display length 1; define WCWIDTH_BROKEN in this case
-
-config.h.in
- - WCWIDTH_BROKEN: new define
-
-lib/readline/rlmbutil.h
- - change WCWIDTH macro to use _rl_utf8locale and the full range of
- Unicode combining characters (U+0300-U+036F)
-
- 5/19
- ----
-lib/readline/rlprivate.h
- - _rl_search_context: new member, prevc, will hold character read
- prior to lastc
-
-lib/readline/isearch.c
- - _rl_isearch_dispatch: if the character causes us to index into
- another keymap, save that character in cxt->prevc
- - _rl_isearch_dispatch: if we index into another keymap, but don't
- find a function that's special to i-search, and the character that
- caused us to index into that keymap would have terminated the
- search, push back cxt->prevc and cxt->lastc to make it appear as
- if `prevc' terminated the search, and execute lastc as a command.
- We have to push prevc back so we index into the same keymap before
- we read lastc. Fixes bug report from Davor Cubranic
- <cubranic@stat.ubc.ca>
-
- 5/20
- ----
-expr.c
- - expr_bind_variable: pay attention to the return value from
- bind_variable and check whether or not we should error out due to
- a readonly or noassign variable. Fixes bug reported by Eric
- Blake <eblake@redhat.com>
-
- 5/26
- ----
-
-lib/readline/search.c
- - include histlib.h for ANCHORED_SEARCH defines
- - rl_history_search_flags: new variable, holds ANCHORED_SEARCH flag for
- the duration of a history search
- - rl_history_search_reinit: takes a new flags variable, defines whether
- or not the search is anchored; assigned to rl_history_search_flags
- - rl_history_serarch_reinit: if ANCHORED_SEARCH flag passed, add ^ to
- beginning of search string; otherwise search string is unmodified
- - rl_history_search_internal: set rl_point appropriately based on
- whether or not rl_history_search_flags includes ANCHORED_SEARCH
- - rl_history_substr_search_forward: new function, for non-anchored
- substring search forward through history for string of characters
- preceding rl_point
- - rl_history_substr_search_backward: new function, for non-anchored
- substring search backward through history for string of characters
- preceding rl_point. Original code from Niraj Kulkarni
- <kulkarniniraj14@gmail.com>
-
-lib/readline/readline.h
- - extern declarations for rl_history_substr_search_{for,back}ward
-
-lib/readline/funmap.c
- - history-substring-search-forward: new bindable command, invokes
- rl_history_substr_search_forward
- - history-substring-search-backward: new bindable command, invokes
- rl_history_substr_search_backward
-
-lib/readline/doc/{rluser.texi,readline.3}
- - document history-substring-search-forward and
- history-substring-search-backward
-
- 5/27
- ----
-{nojobs,jobs}.c
- - add support for DONT_REPORT_SIGTERM so that the shell doesn't print
- a message when a job exits due to SIGTERM since that's the default
- signal sent by the kill builtin. Suggested by Marc Herbert
- <mark.herbert@gmail.com>
-
-config-top.h
- - DONT_REPORT_SIGTERM: new user-modifiable setting. Commented out
- by default
-
- 5/28
- ----
-lib/readline/bind.c
- - _rl_skip_to_delim: skip to a closing double quote or other delimiter,
- allowing backslash to quote any character, including the delimiter
- - rl_parse_and_bind: call _rl_skip_to_delim instead of using inline
- code
- - rl_parse_and_bind: allow quoted strings as the values of string
- variables. Variable values without double quotes have trailing
- whitespace removed (which still allows embedded whitespace, for
- better or worse). Fixes problem with string variables not matching
- in `set' command if values happen to have trailing spaces or tabs
- (debian bash bug #602762), but introduces slight incompatibility.
-
- 5/29
- ----
-doc/{bash.1,bashref.texi}
- - clarify unset description to specify that without options, a
- variable, then a shell function if there is no variable by that
- name, is unset. Fixes discrepancy reported by Mu Qiao
- <qiaomuf@gentoo.org>
-
- 6/4
- ----
-doc/{bash.1,bashref.texi}
- - clarify description of LINES and COLUMNS (and checkwinsize shopt
- option) to make it clear that only interactive shells set a
- handler for SIGWINCH and update LINES and COLUMNS. Original
- report submitted by Jonathan Nieder <jrnieder@gmail.com>
-
-arrayfunc.c
- - expand_compound_array_assignment: defer expansion of words between
- parens when performing compound assignmnt to an associative array
- variable
- - assign_compound_array_list: perform the same expansions when doing
- a compound array assignment to an associative array variable as
- when doing a straight array index assignment. The idea is that
- foo=( [ind1]=bar [ind2]=quux)
- is the same as
- foo[ind1]=bar ; foo[ind2]=quux
-
- This fixes problems with double-expansion and quote removal being
- performed on the array indices
-
- 6/13
- ----
-doc/{bash.1,bashref.texi}
- - Add a little text to make it clear that the locale determines how
- range expressions in glob patterns are handled.
-
-
- 6/21
- ----
-builtins/read.def
- - display a message and return error status if -a is used with an
- existing associative array. Fixes bug reported by Curtis Doty
- <curtis@greenkey.net>
-
- 6/24
- ----
-{jobs,nojobs}.c
- - non-interactive shells now react to the setting of checkwinsize
- and set LINES and COLUMNS after a foreground job exits. From a
- suggestion by Leslie Rhorer <lrhorer@satx.rr.com>
-
-doc/{bash.1,bashref.texi}
- - checkwinsize: remove language saying that only interactive shells
- check the window size after each command
-
-lib/readline/histfile.c
- - history_backupfile: new file, creates a backup history file name
- given a filename (appending `-')
- - history_do_write: when overwriting the history file, back it up
- before writing. Restore backup file on a write error. Suggested
- by chkno@chkno.net
-
-bashline.c
- - find_cmd_name: two new arguments, return the start and end of the
- actual text string used to find the command name, without taking
- whitespace into account
- - attempt_shell_completion: small changes to make sure that completion
- attempted at the beginning of a non-empty line does not find a
- programmable completion, even if the command name starts at point
- - attempt_shell_completion: small change to make sure that completion
- does not find a progcomp when in whitespace before the command
- name
- - attempt_shell_completion: small change to make sure that completion
- does not find a progcomp when point is at the first character of a
- command name, even when there is leading whitespace (similar to
- above). Fixes problems noted by Ville Skytta <ville.skytta@iki.fi>
-
-subst.c
- - brace_expand_word_list: since the individual strings in the strvec
- returned by brace_expand are already allocated, don't copy them to
- newly-allocated memory when building the WORD_LIST, just use them
- intact
-
-locale.c
- - locale_mb_cur_max: cache value of MB_CUR_MAX when we set or change
- the locale to avoid a function call every time we need to read it
-
-shell.h
- - new struct to save shell_input_line and associated variables:
- shell_input_line_state_t
- - add members of sh_parser_state_t to save and restore token and the
- size of the token buffer
-
-parse.y
- - {save,restore}_input_line_state: new functions to save and restore
- shell_input_line and associated variables
- - {save,restore}_parser_state: add code to save and restore the token
- and token buffer size
- - xparse_dolparen: call save_ and restore_input_line_state to avoid
- problems with overwriting shell_input_line when we recursively
- call the parser to parse a command substitution. Fixes bug
- reported by Rui Santos <rsantos@grupopie.com>
-
-include/shmbutil.h
- - use locale_mb_cur_max instead of MB_CUR_MAX in ADVANCE_CHAR and
- similar macros
-
-lib/glob/smatch.c
- - rangecmp,rangecmp_wc: change to take an additional argument, which
- forces the use of strcoll/wscoll when non-zero. If it's 0, a new
- variable `glob_asciirange' controls whether or not we use strcoll/
- wscoll. If glob_asciirange is non-zero, we use straight
- C-locale-like ordering. Suggested by Aharon Robbins
- <arnold@skeeve.com>
-
- 6/30
- ----
-execute_cmd.c
- - execute_pipeline: make sure the lastpipe code is protected by
- #ifdef JOB_CONTROL. Fixes problem reported by Thomas Cort
- <tcort@minix3.org>
-
- 7/2
- ---
-lib/readline/complete.c
- - EXPERIMENTAL: remove setting of _rl_interrupt_immediately around
- completion functions that touch the file system. Idea from Jan
- Kratochvil <jan.ktratochvil@redhat.com> and the GDB development
- team
-
-lib/readline/signals.c
- - rl_signal_handler: if we're in callback mode, don't interrupt
- immediately on a SIGWINCH
-
- 7/3
- ---
-bashline.c
- - set_directory_hook: and its siblings are a new set of functions to
- set, save, and restore the appropriate directory completion hook
- - change callers to use {set,save,restore}_directory_hook instead of
- manipulating rl_directory_rewrite_hook directly
- - dircomplete_expand: new variable, defaults to 0, if non-zero causes
- directory names to be word-expanded during word and filename
- completion
- - change {set,save,restore}_directory_hook to look at dircomplete_expand
- and change rl_directory_completion_hook or rl_directory_rewrite_hook
- appropriately
-
-bashline.h
- - extern declaration for set_directory_hook so shopt code can use it
-
- 7/6
- ---
-builtins/shopt.def
- - globasciiranges: new settable shopt option, makes glob ranges act
- as if in the C locale (so b no longer comes between A and B).
- Suggested by Aharon Robbins <arnold@skeeve.com>
-
- 7/7
- ---
-doc/{bash.1,bashref.texi}
- - document new `globasciiranges' shopt option
-
- 7/8
- ---
-builtins/shopt.def
- - direxpand: new settable option, makes filename completion expand
- variables in directory names like bash-4.1 did.
- - shopt_set_complete_direxpand: new function, does the work for the
- above by calling set_directory_hook
-
-doc/{bash.1,bashref.texi}
- - document new `direxpand' shopt option
-
- 7/15
- ----
-lib/readline/isearch.c
- - _rl_isearch_dispatch: when adding character to search string, use
- cxt->lastc (which we use in the switch statement) instead of c,
- since lastc can be modified earlier in the function
-
- 7/18
- ----
-lib/readline/rlprivate.h
- - _rl_search_context: add another member to save previous value of
- (multibyte) lastc: pmb is to mb as prevc is to lastc
-
-lib/readline/isearch.c:
- - _rl_isearch_dispatch: if a key sequence indexes into a new keymap,
- but doesn't find any bound function (k[ind].function == 0) or is
- bound to self-insert (k[ind].function == rl_insert), back up and
- insert the previous character (the one that caused the index into a
- new keymap) and arrange things so the current character is the next
- one read, so both of them end up in the search string. Fixes bug
- reported by Clark Wang <dearvoid@gmail.com>
- - _rl_isearch_dispatch: a couple of efficiency improvements when adding
- characters to the isearch string
-
- 7/24
- ----
-lib/readline/isearch.c
- - _rl_isearch_dispatch: save and restore cxt->mb and cxt->pmb
- appropriately when in a multibyte locale
-
-doc/{bash.1,bashref.texi}
- - correct description of {x}>file (and other redirection operators
- that allocate a file descriptor) to note the the fd range is
- greater than or equal to 10. Fixes problem reported by
- Christian Ullrich
-
-lib/readline/signals.c
- - rl_signal_handler: don't interrupt immediately if in callback mode
-
-lib/readline/callback.c
- - rl_callback_read_char: install signal handlers only when readline
- has control in callback mode, so readline's signal handlers aren't
- called when the application is active (e.g., between the calls to
- rl_callback_handler_install and rl_callback_read_char). If the
- readline signal handlers only set a flag, which the application
- doesn't know about, the signals will effectively be ignored until
- the next time the application calls into the readline callback
- interface. Fixes problem of calling unsafe functions from signal
- handlers when in callback mode reported by Jan Kratochvil
- <jan.kratochvil@redhat.com>
-
-execute_cmd.c
- - fix_assignment_words: when in Posix mode, the `command' builtin
- doesn't change whether or not the command name it protects is an
- assignment builtin. One or more instances of `command'
- preceding `export', for instance, doesn't make `export' treat its
- assignment statement arguments differently. Posix interpretation
- #351
-
-doc/{bash.1,bashref.texi}
- - document new Posix-mode behavior of `command' when preceding builtins
- that take assignment statements as arguments
-
-builtins/printf.def
- - printstr: if fieldwidth or precision are < 0 or > INT_MAX when
- supplied explicitly (since we take care of the `-' separately),
- clamp at INT_MAX like when using getint(). Fixes issue reported
- by Ralph Coredroy <ralph@inputplus.co.uk>
-
- 7/25
- ----
-lib/readline/chardefs.h
- - isxdigit: don't define if compiling with c++; declared as a c++
- template function. Fixes bug reported by Miroslav Lichvar
- <mlichvar@redhat.com>
-
-builtins/printf.def
- - getint: if garglist == 0, return whatever getintmax returns (0).
- Fixes bug reported by Ralph Coredroy <ralph@inputplus.co.uk>
-
- 7/28
- ----
-doc/{bash.1,bashref.texi}
- - minor changes to the descriptions of the cd and pushd builtins
-
-lib/sh/zread.c
- - zsyncfd: change variable holding return value from lseek to
- off_t. Bug report and fix from Gregory Margo <gmargo@pacbell.net>
-
- 8/1
- ---
-expr.c
- - don't check for division by 0 when in a context where no evaluation
- is taking place. Fixes bug reported by dnade.ext@orange-ftgroup.com
-
- 8/6
- ---
-execute_cmd.c
- - execute_command_internal: the parent branch of the subshell code
- (where the child calls execute_in_subshell) should not close all
- open FIFOs with unlink_fifo_list if it's part of a shell function
- that's still executing. Fixes bug reported by Maarten Billemont
- <lhunath@lyndir.com>
-
- 8/9
- ---
-builtins/common.c
- - get_exitstat: return EX_BADUSAGE (2) on a non-numeric argument
-
-builtins/return.def
- - return_builtin: just call get_exitstat to get the return status,
- let it handle proper parsing and handling of arguments. Fixes
- issue most recently raised by Linda Walsh <bash@tlinx.org>.
- Reverses change from 9/11/2008 (see above)
-
- 8/16
- ----
-doc/{bash.1,bashref.texi}
- - clean up `set -e' language to make it clearer that any failure of
- a compound command will cause the shell to exit, not just subshells
- and brace commands
-
- 8/17
- ----
-configure.in
- - make the various XXX_FOR_BUILD variables `precious' to autoconf to
- avoid stale data
- - change how CC_FOR_BUILD is initialized when cross-compiling and not,
- but do not change behavior
- - initialize CFLAGS_FOR_BUILD to -g when cross-compiling
- - initialize LIBS_FOR_BUILD to $(LIBS) when not cross-compiling, empty
- when cross-compiling
- - create AUTO_CFLAGS variable to hold basic CFLAGS defaults; used when
- CFLAGS not inherited from environment (like effect of old
- auto_cflags variable)
- - substitute LIBS_FOR_BUILD into output Makefiles
- [changes inspired by bug report from Nathan Phillip Brink
- <ohnobinki@ohnopublishing.net> -- gentoo bug 378941]
-
-builtins/Makefile.in
- - substitute LIBS_FOR_BUILD from configure, not strictly initialized
- to $(LIBS)
-
- 8/27
- ----
-doc/{bash.1,bashref.texi}
- - minor changes to the here string description to clarify the
- expansions performed on the word
-
-support/shobj-conf
- - handle compilation on Lion (Mac OS X 10.7/darwin11) with changes
- to darwin stanzas. Fixes readline bug reported by Vincent
- Sheffer <vince.sheffer@apisphere.com>
-
-lib/sh/strtrans.c
- - ansic_wshouldquote: check a string with multi-byte characters for
- characters that needs to be backslash-octal escaped for $'...'
- - ansic_shouldquote: if is_basic fails for one character, let
- ansic_wshouldquote examine the rest of the string and return what
- it returns. From a patch sent by Roman Rakus <rrakus@redhat.com>
-
- 8/30
- ----
-lib/sh/strtrans.c
- - ansic_quote: changes to quote (or not) multibyte characters. New
- code converts them to wide characters and uses iswprint to check
- valid wide chars. From a patch sent by Roman Rakus
- <rrakus@redhat.com>
-
- 9/7
- ---
-lib/sh/shquote.c
- - sh_backslash_quote: change to be table-driven so we can use a
- different table if we want to
- - sh_backslash_quote: takes a second char table[256] argument;
-
-externs.h
- - sh_backslash_quote: add second argument to function prototype
-
-bashline.c,braces.c,parse.y,builtins/printf.def
- - change callers of sh_backslash_quote to add second argument
-
-bashline.c
- - filename_bstab: table of characters to pass to sh_backslash_quote;
- characters with value 1 will be backslash-quoted
- - set_filename_bstab: turn on characters in filename backslash-quote
- table according to passed string argument
- - call set_filename_bstab every time rl_filename_quote_characters is
- assigned a value
- - bash_quote_filename: call sh_backslash_quote with filename_bstab
- as second argument. This allows other characters in filenames to
- be quoted without quoting, for instance, a dollar sign in a shell
- variable reference
-
- 9/8
- ---
-bashline.c
- - complete_fullquote: new variable, controls table passed to
- sh_backslash_quote. If non-zero (the default), the standard set
- of shell metacharacters -- as in bash versions up to and including
- bash-4.2 -- gets backslash-quoted by the completion code. If zero,
- sh_backslash_quote gets the table with the characters in the
- variable reference removed, which means they are removed from the
- set of characters to be quoted in filenames
-
- 9/10
- ----
-bashline.c
- - bash_filename_stat_hook: new function, designed to expand variable
- references in filenames before readline passes them to stat(2)
- to determine whether or not they are a directory
-
- 9/15
- ----
-builtins/declare.def
- - if assign_array_element fails due to a bad (or empty) subscript, mark
- it as an assignment error and don't attempt any further processing
- of that declaration. Fixes segfault bug reported by Diego Augusto
- Molina <diegoaugustomolina@gmail.com>
-
- 9/19
- ----
-expr.c
- - exppower: replace the simple exponentiation algorithm with an
- implementation of exponentiation by squaring. Inspired by report
- from Nicolas ARGYROU <nargy@yahoo.com>
-
-bashline.c
- - bash_quote_filename: check for rtext being non-null before
- dereferencing it
- - set_saved_history: operate_and_get_next assumes that the previous
- line was added to the history, even when the history is stifled and
- at the max number of entries. If it wasn't, make sure the history
- number is incremented properly. Partial fix for bug reported by
- gregrwm <backuppc-users@whitleymott.net>
-
-doc/{bash.1,bashref.texi},lib/readline/doc/{hsuser,rluser}.texi
- - minor editorial changes inspired by suggestions from
- Roger Zauner <rogerx.oss@gmail.com>
-
- 9/20
- ----
-lib/intl/localealias.c
- - read_alias_file: close resource leak (fp) when returning on error
-
- 9/22
- ----
-execute_command.c
- - execute_intern_function: implement Posix interpretation 383 by making
- it an error to define a function with the same name as a special
- builtin when in Posix mode.
- http://austingroupbugs.net/view.php?id=383#c692
-
- 9/25
- ----
-doc/{bash.1,bashref.texi}
- - formatting and some content changes from Benno Schulenberg
- <bensberg@justemail.net>
- - document new posix-mode behavior from interp 383 change of 9/22
-
- 9/30
- ----
-execute_cmd.c
- - shell_execve: add strerror to error message about executable file
- that shell can't execute as a shell script. From suggestion by
- daysleeper <daysleeper@centrum.cz>
-
- 10/1
- ----
-bashhist.c
- - maybe_add_history: act as if literal_history is set when parser_state
- includes PST_HEREDOC, so we save the bodies of here-documents just
- as they were entered. Fixes bug reported by Jonathan Wakely
- <bugs@kayari.org>
- - bash_add_history: make sure that the second and subsequent lines of
- a here document don't have extra newlines or other delimiting
- chars added, since they have the trailing newline preserved, when
- `lithist' is set and history_delimiting_chars isn't called
-
-execute_cmd.c
- - execute_command_internal: avoid fd exhaustion caused by using
- process substitution in loops inside shell functions by using
- copy_fifo_list and close_new_fifos (). Fixes debian bash bug
- 642504
-
-lib/readline/complete.c
- - new variable, rl_filename_stat_hook, used by append_to_match. If
- filename completion is desired, and rl_filename_stat_hook points
- to a function, call that function to expand the filename in an
- application-specific way before calling stat.
-
-bashline.c
- - bash_default_completion: if variable completion returns a single
- match, use bash_filename_stat_hook and file_isdir to determine
- whether or not the variable name expands to a directory. If it
- does, set the filename_append_character to `/'. This is not
- perfect, so we will see how it works out. Adds functionality
- requested by Peter Toft <pto@linuxbog.dk> and Patrick Pfeifer
- <patrick@pfeifer.de>
- - rl_filename_stat_hook: assigned bash_filename_stat_hook, so things
- like $HOME/Downloads (after completion) have a slash appended.
- In general, this causes the stat hook to be called whenever
- filename completion is appended. Adds functionality requested by
- Patrick Pfeifer <patrick@pfeifer.de>
-
-lib/readline/readline.h
- - new extern declaration for rl_filename_stat_hook
-
-lib/readline/doc/rltech.texi
- - rl_directory_rewrite_hook: now documented
- - rl_filename_stat_hook: document
-
-pcomplete.c
- - gen_action_completions: in the CA_DIRECTORY case, turn off
- rl_filename_completion_desired if it was off before we called
- rl_filename_completion_function and we didn't get any matches.
- Having it on causes readline to quote the matches as if they
- were filenames. Adds functionality requested by many,
- including Clark Wang <dearvoid@gmail.com>
-
-assoc.[ch]
- - assoc_replace: new function, takes the same arguments as
- assoc_insert, but returns the old data instead of freeing it
- - assoc_insert: if the object returned by hash_insert doesn't have
- the same value for its key as the key passed as an argument, we
- are overwriting an existing value. In this case, we can free the
- key. Fixes bug reported by David Parks <davidparks21@yahoo.com>
-
- 10/5
- ----
-print_cmd.c
- - indirection_level_string: small change to only re-enable `x'
- option after calling decode_prompt_string if it was on before. In
- normal mode, it will be, but John Reiser <jreiser@bitwagon.com>
- has a novel use for that code in conjunction with a pre-loaded
- shared library that traces system call usage in shell scripts
-
- 10/10
- -----
-Makefile.in
- - Fix from Mike Frysinger <vapier@gentoo.org> to avoid trying to
- build y.tab.c and y.tab.h with two separate runs of yacc if
- parse.y changes. Problem with parallel makes
- - Fix from Mike Frysinger <vapier@gentoo.org> to avoid subdirectory
- builds each trying to make version.h (and all its dependencies)
-
-lib/sh/Makefile.in
- - remove some dependencies on version.h where it doesn't make sense
-
-variables.c
- - initialize_shell_variables: while reading the environment, a shell
- running in posix mode now checks for SHELLOPTS being readonly (it
- gets set early on in main()) before trying to assign to it. It
- saves an error message and the variable gets parsed as it should.
- Fixes bug reported by Len Giambrone <Len.Giambrone@intersystems.com>
-
- 10/14
- -----
-doc/{bash.1,bashref.texi}
- - add to the "duplicating file descriptors" description that >&word
- doesn't redirect stdout and stderr if word expands to `-'
- - add to the "appending standard output and standard error"
- description a note that >&word, where word is a number or `-',
- causes other redirection operators to apply for sh and Posix
- compatibility reasons. Suggested by Greg Wooledge
- <wooledg@eeg.ccf.org>
-
- 10/15
- -----
-pcomplete.c
- - change pcomp_filename_completion_function to only run the filename
- dequoting function in the cases (as best as it can figure) where
- readline won't do it via rl_filename_completion_function. Based
- on reports from <lolilolicon@gmail.com>
-
- 10/19
- -----
-bashline.c
- - attempt_shell_completion: add call to set_directory_hook() to make
- sure the rewrite functions are correct. It's cheap and doesn't
- hurt
- - command_word_completion_function: if completing a command name that
- starts with `.' or `..', temporarily suppress the effects of the
- `direxpand' option and restore the correct value after calling
- rl_filename_completion_function. If it's enabled, the directory
- name will be rewritten and no longer match `./' or `../'. Fixes
- problem reported by Michael Kalisz <michael@kalisz.homelinux.net>
-
- 10/22
- -----
-builtins/history.def
- - push_history: make sure remember_on_history is enabled before we
- try to delete the last history entry -- the `history -s' command
- might not have been saved. Fixes bug reported by
- lester@vmw-les.eng.vmware.com
-
-lib/readline/complete.c
- - rl_callback_read_char: add calls to a macro CALLBACK_READ_RETURN
- instead of straight return; add same call at end of function.
- Placeholder for future work in deinstalling signal handlers when
- readline is not active
-
- 10/25
- -----
-expr.c
- - exp2: catch arithmetic overflow when val1 == INTMAX_MIN and val2 == -1
- for DIV and MOD and avoid SIGFPE. Bug report and pointer to fix
- from Jaak Ristioja <jaak.ristioja@cyber.ee>
- - expassign: same changes for arithmetic overflow for DIV and MOD
-
- 10/28
- -----
-subst.c
- - parameter_brace_expand: allow pattern substitution when there is an
- expansion of the form ${var/} as a no-op: replacing nothing with
- nothing
- - parameter_brace_patsub: don't need to check for PATSUB being NULL;
- it never is
-
-flags.c
- - if STRICT_POSIX is defined, initialize history_expansion to 0, since
- history expansion (and its treatment of ! within double quotes) is
- not a conforming posix environment. From austin-group issue 500
-
-lib/readline/histexpand.c
- - history_expand: when processing a string within double quotes
- (DQUOTE == 1), make the closing double quote inhibit history
- expansion, as if the word were outside double quotes. In effect,
- we assume that the double quote is followed by a character in
- history_no_expand_chars. tcsh and csh seem to do this. This
- answers a persistent complaint about history expansion
-
- 10/29
- -----
-make_cmd.c
- - make_arith_for_command: use skip_to_delim to find the next `;'
- when breaking the string between the double parens into three
- separate components instead of a simple character loop. Fixes
- bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 11/2
- ----
-Makefile.in
- - make libbuiltins.a depend on builtext.h to serialize its creation
- and avoid conflict between multiple invocations of mkbuiltins.
- Fix from Mike Frysinger <vapier@gentoo.org>
-
- 11/5
- ----
-findcmd.c
- - user_command_matches: if stat(".", ...) returns -1, set st_dev
- and st_ino fields in dotinfo to 0 to avoid same_file matches
- - find_user_command_in_path: check stat(2) return the same way
-
-lib/glob/glob.c
- - glob_vector: don't call strlen(pat) without checking pat == 0
- - glob_dir_to_array: make sure to free `result' and all allocated
- members before returning error due to malloc failure
- - glob_vector: make sure to free `nextname' and `npat' on errors
- (mostly when setting lose = 1)
- - glob_vector: if flags & GX_MATCHDIRS but not GX_ALLDIRS, make
- sure we free `subdir'
- - glob_filename: when expanding ** (GX_ALLDIRS), make sure we
- free temp_results (return value from glob_vector)
-
-lib/glob/xmbsrtowcs.c
- - xdupmbstowcs: fix call to realloc to use sizeof (char *) instead
- of sizeof (char **) when assigning idxtmp
-
-execute_cmd.c
- - print_index_and_element: return 0 right away if L == 0
- - is_dirname: fix memory leak by freeing `temp'
- - time_command: don't try to deref NULL `command' when assigning
- to `posix_time'
- - shell_execve: null-terminate `sample' after READ_SAMPLE_BUF so it's
- terminated for functions that expect that
-
-builtins/read.def
- - read_builtin: don't call bind_read_variable with a potentially-null
- string
-
-pcomplete.c
- - gen_command_matches: don't call dispose_word_desc with a NULL arg
- - gen_compspec_completions: fix memory leak by freeing `ret' before
- calling gen_action_completions (tcs, ...). happens when
- performing directory completion as default and no completions
- have been generated
- - gen_progcomp_completions: make sure to set foundp to 0 whenever
- returning NULL
- - it_init_aliases: fix memory leak by freeing alias_list before
- returning
-
-bashline.c
- - command_word_completion_function: don't call restore_tilde with a
- NULL directory_part argument
- - bash_directory_expansion: bugfix: don't throw away results of
- rl_directory_rewrite_hook if it's set and returns non-zero
- - bind_keyseq_to_unix_command: free `kseq' before returning error
-
-arrayfunc.c
- - assign_array_element_internal: make sure `akey' is freed if non-null
- before returning error
- - assign_compound_array_list: free `akey' before returning error
- - array_value_internal: free `akey' before returning error
- - unbind_array_element: free `akey' before returning error
-
-subst.c
- - array_length_reference: free `akey' before returning error in case
- of expand_assignment_string_to_string error
- - array_length_reference: free `akey' after call to assoc_reference
- - skip_to_delim: if skipping process and command substitution, free
- return value from extract_process_subst
- - parameter_brace_substring: free `val' (vtype == VT_VARIABLE) before
- returning if verify_substring_values fails
- - parameter_brace_expand: remove two duplicate lines that allocate
- ret in parameter_brace_substring case
- - parameter_brace_expand: convert `free (name); name = xmalloc (...)'
- to use `xrealloc (name, ...)'
- - parameter_brace_expand: free `name' before returning when handling
- ${!PREFIX*} expansion
- - split_at_delims: fix memory leak by freeing `d2' before returning
-
-redir.c
- - redirection_error: free `filename' if the redirection operator is
- REDIR_VARASSIGN by assigning allocname
-
-eval.c
- - send_pwd_to_eterm: fix memory leak by freeing value returned by
- get_working_directory()
-
-builtins/cd.def
- - change_to_directory: fix memory leak by freeing return value from
- resetpwd()
- - cd_builtin: fix memory leak by freeing value returned by dirspell()
- - cd_builtin: fix memory leak by freeing `directory' if appropriate
- before overwriting with return value from resetpwd()
-
-builtins/type.def
- - describe_command: free `full_path' before overwriting it with return
- value from sh_makepath
-
-builtins/complete.def
- - compgen_builtin: fix memory leak by calling strlist_dispose (sl)
- before overwriting sl with return value from completions_to_stringlist
-
-builtins/hash.def
- - list_hashed_filename_targets: fix memory leak by freeing `target'
-
-make_cmd.c
- - make_arith_for_command: free `init', `test', and `step' before
- returning error on parse error
-
-jobs.c
- - initialize_job_control: don't call move_to_high_fd if shell_tty == -1
-
-general.c
- - check_dev_tty: don't call close with an fd < 0
- - legal_number: deal with NULL `string' argument, return invalid
-
-lib/sh/fmtulong.c
- - fmtulong: if the `base' argument is invalid, make sure we index
- buf by `len-1' at maximum
-
-print_cmd.c
- - print_deferred_heredocs: don't try to dereference a NULL `cstring'
- - cprintf: make sure to call va_end (args)
-
-variables.c
- - push_dollar_vars: fix call to xrealloc to use sizeof (WORD_LIST *)
- instead of sizeof (WORD_LIST **)
-
-lib/sh/zmapfd.c
- - zmapfd: if read returns error, free result and return -1 immediately
- instead of trying to reallocate it
-
- 11/6
- ----
-execute_cmd.c
- - cpl_reap: rewrote to avoid using pointer after freeing it; now builds
- new coproc list on the fly while traversing the old one and sets the
- right values for coproc_list when done
-
- 11/12
- -----
-builtins/set.def
- - if neither -f nor -v supplied, don't allow a readonly function to
- be implicitly unset. Fixes bug reported by Jens Schmidt
- <jens.schmidt35@arcor.de>
-
-lib/readline/callback.c
- - change CALLBACK_READ_RETURN to clear signal handlers before returning
- from rl_callback_read_char so readline's signal handlers aren't
- installed when readline doesn't have control. Idea from Jan
- Kratochvil <jan.ktratochvil@redhat.com> and the GDB development
- team
-
-pcomplete.h
- - COPT_NOQUOTE: new complete/compgen option value
-
-builtins/complete.def
- - noquote: new complete/compgen option; will be used to disable
- filename completion quoting
-
-pcomplete.c
- - pcomp_set_readline_variables: pay attention to COPT_NOQUOTE; turns
- of rl_filename_quoting_desired if set; turns it on if unset (value
- is inverted, since default is on)
-
-doc/bash.1,lib/readline/doc/rluser.texi
- - document new -o noquote option to complete/compgen/compopt
-
-pathexp.c
- - quote_string_for_globbing: if QGLOB_REGEXP, make sure characters
- between brackets in an ERE bracket expression are not inappropriately
- quoted with backslashes. This is a pretty substantial change,
- should be stressed when opening bash up for alpha and beta tests.
- Fixes bug pointed out by Stephane Chazleas
- <stephane_chazelas@yahoo.fr>
-
-doc/{bash.1,bashref.texi}
- - document that regexp matches can be inconsistent when quoting
- characters in bracket expressions, since usual quoting characters
- lose their meaning within brackets
- - note that regular expression matching when the pattern is stored
- in a shell variable which is quoted for expansion causes string
- matching
-
-redir.h
- - RX_SAVEFD: new flag value; notes that a redirection denotes an
- fd used to save another even if it's not >= SHELL_FD_BASE
-
-redir.c
- - do_redirection_internal: when deciding whether or not to reset the
- close-on-exec flag on a restored file descriptor, trust the value
- of redirect->flags & RX_SAVCLEXEC even if the fd is < SHELL_FD_BASE
- if the RX_SAVEFD flag is set
- - add_undo_redirect: set the RX_SAVEFD flag if the file descriptor
- limit is such that the shell can't duplicate to a file descriptor
- >= 10. Fixes a limitation that tripped a coreutils test reported
- by Paul Eggert <eggert@cs.ucla.edu>
-
- 11/19
- -----
-doc/{bash.1,bashref.texi},lib/readline/doc/hsuser.texi
- - make it clear that bash runs HISTFILESIZE=$HISTSIZE after reading
- the startup files
- - make it clear that bash runs HISTSIZE=500 after reading the
- startup files
- - make it clear that setting HISTSIZE=0 causes commands to not be
- saved in the history list
- - make it clear that setting HISTFILESIZE=0 causes the history file
- to be truncated to zero size
-
-variables.c
- - sv_histsize: change so setting HISTSIZE to a value less than 0
- causes the history to be `unstifled'
- - sv_histsize: change so setting HISTFILESIZE to a value less than 0
- results in no file truncation
- - make it clear that numeric values less than 0 for HISTFILESIZE or
- HISTSIZE inhibit the usual functions
-
- 11/23
- -----
-parse.y
- - save_input_line_state: add missing `return ls' at the end, since the
- function is supposed to return its argument. Pointed out by
- Andreas Schwab <schwab@linux-m68k.org>
-
-builtins/read.def
- - skip over NUL bytes in input, as most modern shells seem to. Bug
- report by Matthew Story <matt@tablethotels.com>
-
-lib/readline/vi_mode.c
- - rl_vi_replace: set _rl_vi_last_key_before_insert to invoking key
-
- 11/25
- -----
-builtins/read.def
- - read_builtin: if xrealloc returns same pointer as first argument,
- don't bother with the remove_unwind_protect/add_unwind_protect pair
- - read_builtin: set a flag (`reading') around calls to zread/zreadc
- and readline()
- - sigalrm: change to set flag (`sigalrm_seen') and only longjmp if
- currently in read(2) (reading != 0)
- - CHECK_ALRM: new macro, checks sigalrm_seen and longjmps if non-zero,
- behavior of old SIGALRM catching function
- - read_builtin: call CHECK_ALRM in appropriate places while reading
- line of input. Fixes bug reported by Pierre Gaston
- <pierre.gaston@gmail.com>
-
-lib/readline/vi_mode.c
- - rl_vi_replace: initialize characters before printing characters in
- vi_replace_keymap to their default values in vi_insertion_keymap,
- since we're supposed to be in insert mode replacing characters
- - rl_vi_replace: call rl_vi_start_inserting to set last command to
- `R' for undo
- - rl_vi_replace: set _rl_vi_last_key_before_insert to `R' for future
- use by _rl_vi_done_inserting
- - vi_save_insert_buffer: new function, broke out code that copies text
- into vi_insert_buffer from _rl_vi_save_insert
- - _rl_vi_save_replace: new function, saves text modified by
- rl_vi_replace (using current point and vi_replace_count to figure
- it out) to vi_replace_buffer
- - _rl_vi_save_insert: call vi_save_insert_buffer
- - _rl_vi_done_inserting: if _rl_vi_last_key_before_insert == 'R', call
- _rl_vi_save_replace to save text modified in replace mode (uses
- vi_save_insert_buffer)
- - _rl_vi_replace_insert: new function, replaces the number of chars
- in vi_insert_buffer after rl_point with contents ov vi_insert_buffer
- - rl_vi_redo: call _rl_vi_replace_insert if last command == 'R' and
- there's something in vi_insert_buffer. Fixes bug with `.' not
- redoing the most recent `R' command, reported by Geoff Clare
- <g.clare@opengroup.org> in readline area on savannah
-
- 11/26
- -----
-lib/readline/rlprivate.h
- - RL_SIG_RECEIVED(): evaluate to non-zero if there is a pending signal
- to be handled
- - RL_SIGINT_RECEIVED(): evaluate to non-zero if there is a pending
- SIGINT to be handled
-
-lib/readline/complete.c
- - remove all mention of _rl_interrupt_immediately
- - rl_completion_matches: check RL_SIG_RECEIVED after each call to
- the entry function, call RL_CHECK_SIGNALS if true to handle the
- signal
- - rl_completion_matches: if RL_SIG_RECEIVED evaluates to true, free
- and zero out the match_list this function allocated
- - rl_completion_matches: if the completion entry function is
- rl_filename_completion_function, free the contents of match_list,
- because that function does not keep state and will not free the
- entries; avoids possible memory leak pointed out by
- Garrett Cooper <yanegomi@gmail.com>
- - gen_completion_matches: if RL_SIG_RECEIVED evalutes to true after
- calling rl_attempted_completion_function, free the returned match
- list and handle the signal with RL_CHECK_SIGNALS; avoids
- possible memory leak pointed out by Garrett Cooper
- <yanegomi@gmail.com>
- - gen_completion_matches: if RL_SIG_RECEIVED evaluates to true after
- calling rl_completion_matches, free the returned match list and
- handle the signal with RL_CHECK_SIGNALS
-
-lib/readline/util.c
- - rl_settracefp: new utility function to set the tracing FILE *
-
-lib/readline/signals.c
- - _rl_sigcleanup: pointer to a function that will be called with the
- signal and a void * argument from _rl_handle_signal
- - _rl_sigcleanarg: void * that the rest of the code can set to have
- passed to the signal cleanup function
- - _rl_handle_signal: if _rl_sigcleanup set, call as
- (*_rl_sigcleanup) (sig, _rl_sigcleanarg)
-
-lib/readline/rlprivate.h
- - extern declarations for _rl_sigcleanup and _rl_sigcleanarg
-
-lib/readline/complete.c
- - _rl_complete_sigcleanup: signal cleanup function for completion code;
- calls _rl_free_match_list on _rl_sigcleanarg if signal == SIGINT
- - rl_complete_internal: before calling display_matches if what_to_do
- == `?', set _rl_sigcleanup to _rl_complete_sigcleanup so the match
- list gets freed on SIGINT; avoids possible memory leak pointed out
- by Garrett Cooper <yanegomi@gmail.com>
- - rl_complete_internal: in default switch case, call _rl_free_match_list
- before returning to avoid memory leak
-
-doc/bashref.texi
- - start at a set of examples for the =~ regular expression matching
- operator, touching on keeping the pattern in a shell variable and
- quoting portions of the pattern to remove their special meaning
-
- 12/1
- ----
-lib/glob/gmisc.c
- - extglob_pattern: new function, returns 1 if pattern passed as an
- argument looks like an extended globbing pattern
-
-lib/glob/glob.c
- - skipname: return 0 immediately if extglob_pattern returns non-zero,
- let the extended globbing code do the right thing with skipping
- names beginning with a `.'
- - mbskipname: return 0 immediately if extglob_pattern returns non-zero,
- let the extended globbing code do the right thing with skipping
- names beginning with a `.'. Fixes bug reported by Yongzhi Pan
- <panyongzhi@gmail.com>
-
- 12/2
- ----
-lib/glob/smatch.c
- - patscan, patscan_wc: no longer static so other parts of the glob
- library can use them, renamed to glob_patscan, glob_patscan_wc
-
-lib/glob/glob.c
- - extern declarations for glob_patscan, glob_patscan_wc
- - wchkname: new function, does skipname on wchar_t pattern and dname,
- old body of mbskipname after converting to wide chars
- - extglob_skipname: new function, checks all subpatterns in an extglob
- pattern to determine whether or not a filename should be skipped.
- Calls skipname for each subpattern. Dname is only skipped if all
- subpatterns indicate it should be. Better fix for bug reported by
- Yongzhi Pan <panyongzhi@gmail.com>
- - wextglob_skipname: wide-char version of extglob_skipname, calls
- wchkname instead of calling back into mbskipname for each
- subpattern to avoid problems with char/wchar_t mismatch
- - skipname: call extglob_skipname if extglob_pattern returns non-zero
- - mbskipname: call wextglob_skipname if extglob_pattern returns non-zero
- - mbskipname: short-circuit immediately if no multibyte chars in
- pattern or filename
-
-execute_cmd.c
- - execute_cond_node: added parens to patmatch assignment statement to
- make intent clearer
-
- 12/3
- ----
-configure.in,config.h.in
- - check for imaxdiv, define HAVE_IMAXDIV if present
-
-expr.c
- - expassign, exp2: use imaxdiv if available. Doesn't help with checks
- for overflow from 10/25
-
- 12/6
- ----
-lib/readline/complete.c
- - compute_lcd_of_matches: if we're ignoring case in the matches, only
- use what the user typed as the lcd if it matches the first match
- (after sorting) up to the length of what was typed (if what the
- user typed is longer than the shortest of the possible matches, use
- the shortest common length of the matches instead). If it doesn't
- match, use the first of the list of matches, as if case were not
- being ignored. Fixes bug reported by Clark Wang
- <dearvoid@gmail.com>
-
- 12/7
- ----
-builtins/cd.def
- - cd_builtin: add code to return error in case cd has more than one
- non-option argument, conditional on CD_COMPLAINS define (which is
- not defined anywhere)
-
-doc/{bash.1,bashref.texi}
- - note that additional arguments to cd following the directory name
- are ignored. Suggested by Vaclav Hanzl <hanzl@noel.feld.cvut.cz>
-
- 12/10
- -----
-lib/readline/input.c
- - rl_read_key: don't need to increment key sequence length here; doing
- it leads to an off-by-one error
-
-lib/readline/macro.c
- - rl_end_kbd_macro: after off-by-one error with rl_key_sequence_length
- fixed, can decrement current_macro_index by rl_key_sequence_length
- (length of key sequence that closes keyboard macro)
-
-lib/readline/readline.c
- - _rl_dispatch_subseq: fix extra increment of rl_key_sequence_length
- when ESC maps to a new keymap and we're converting meta characters
- to ESC+key
- - _rl_dispatch_subseq: better increment of rl_key_sequence_length
- before we dispatch to a function in the ISFUNC case (where the
- second increment above should have happened)
- - rl_executing_keyseq: the full key sequence that ended up executing
- a readline command. Available to the calling application, maintained
- by _rl_dispatch_subseq, indexed by rl_key_sequence_length
- - rl_executing_key: the key that was bound to the currently-executing
- readline command. Same as the `key' argument to the function
-
-lib/readline/readline.h
- - rl_executing_keyseq: extern declaration
- - rl_executing_key: extern declaration
- - rl_key_sequence_length: declaration moved here from rlprivate.h,
- now part of public interface
-
-lib/readline/rlprivate.h
- - new extern declaration for _rl_executing_keyseq_size, buffer size
- for rl_executing_keyseq
-
-lib/readline/doc/rltech.texi
- - documented new variables: rl_executing_key, rl_executing_keyseq,
- rl_key_sequence_length
-
- 12/13
- -----
-bashline.c
- - bash_execute_unix_command: replace ad-hoc code that searches
- cmd_xmap for correct command with call to rl_function_of_keyseq
- using rl_executing_keyseq; now supports key sequences longer
- than two characters. Fixes bug reported by Michael Kazior
- <kazikcz@gmail.com>
-
- 12/15
- -----
-make_cmd.c
- - make_function_def: don't null out source_file before calling
- make_command so it can be used later on when the function definition
- is executed
-
-execute_cmd.c
- - execute_intern_function: second argument is now FUNCTION_DEF *
- instead of COMMAND *
- - execute_command_internal: call execute_intern_function with the
- new second argument (the entire FUNCTION_DEF instead of just the
- command member)
- - execute_intern_function: if DEBUGGER is defined, call
- bind_function_def before calling bind_function, just like
- make_function_def does (might be able to take out the call in
- make_function_def depending on what the debugger does with it).
- Fixes bug reported by <dethrophes@motd005>
-
-expr.c
- - more minor changes to cases of INTMAX_MIN % -1 and INTMAX_MIN / 1;
- fix typos and logic errors
-
- 12/16
- -----
-bashline.c
- - find_cmd_start: change flags to remove SD_NOSKIPCMD so it skips over
- command substitutions and doesn't treat them as command separators
- - attempt_shell_completion: instead of taking first return from
- find_cmd_name as command name to use for programmable completion,
- use loop to skip over assignment statements. Fixes problem reported
- by Raphael Droz <raphael.droz+floss@gmail.com>
- - attempt_shell_completion: if we don't find a command name but the
- command line is non-empty, assume the other words are all assignment
- statements and flag that point is in a command position so we can
- do command name completion
- - attempt_shell_completion: if the word being completed is the first
- word following a series of assignment statements, and the
- command line is non-empty, flag that point is in a command position
- so we can do command name completion
-
-lib/readline/history.c
- - history_get_time: atol -> strtol
-
- 12/18
- -----
-parse.y
- - parser_in_command_position: external interface to the
- command_token_position macro for use by other parts of the shell,
- like the completion mechanism
-
-externs.h
- - extern declaration for parser_in_command_position
-
- 12/19
- -----
-
-builtins/read.def
- - read_builtin: make sure all calls to bind_read_variable are passed
- a non-null string. Fixes bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
-bashline.c
- - attempt_shell_completion: mark that we're in a command position if
- we're at the start of the line and the parser is ready to accept
- a reserved word or command name. Feature most recently suggested
- by Peng Yu <pengyu.ut@gmail.com>
-
- 12/21
- -----
-lib/readline/bind.c
- - _rl_escchar: return the character that would be backslash-escaped
- to denote the control character passed as an argument ('\n' -> 'n')
- - _rl_isescape: return 1 if character passed is one that has a
- backslash escape
- - _rl_untranslate_macro_value: new second argument: use_escapes, if
- non-zero translate to backslash escapes where possible instead of
- using straight \C-x for control character `x'. Change callers
- - _rl_untranslate_macro_value: now global
-
-lib/readline/rlprivate.h
- - _rl_untranslate_macro_value: extern declaration
-
-lib/readline/{macro.c,readline.h}
- - rl_print_last_kbd_macro: new bindable function, inspired by patch
- from Mitchel Humpherys
-
-lib/readline/funmap.c
- - print-last-kbd-macro: new bindable command, bound to
- rl_print_last_kbd_macro
-
-lib/readline/doc/{rluser.texi,readline.3},doc/bash.1
- - print-last-kbd-macro: document.
-
-lib/readline/text.c
- - _rl_insert_next: if we're defining a macro, make sure the key gets
- added to the macro text (should really audit calls to rl_read_key()
- and make sure the right thing is happening for all of them)
-
-bashline.[ch]
- - print_unix_command_map: new function, prints all bound commands in
- cmd_xmap using rl_macro_dumper in a reusable format
-
-builtins/bind.def
- - new -X option: print all keysequences bound to Unix commands using
- print_unix_command_map. Feature suggested by Dennis Williamson
- (2/2011)
-
-doc/{bash.1,bashref.texi}
- - document new `bind -X' option
-
- 12/24
- -----
-
-doc/{bash.1,bashref.texi}
- - add a couple of sentences to the description of the case modification
- operators making it clearer that each character of parameter is
- tested against the pattern, and that the pattern should only attempt
- to match a single character. Suggested by Bill Gradwohl
- <bill@ycc.com>
-
- 12/28
- -----
-shell.c
- - init_noninteractive: instead of calling set_job_control(0) to
- unconditionally turn off job control, turn on job control if
- forced_interactive or jobs_m_flag is set
- - shell_initialize: call initialize_job_control with jobs_m_flag as
- argument so `bash -m script' enables job control while running the
- script
-
-jobs.c
- - initialize_job_control: if the `force' argument is non-zero, turn on
- job control even if the shell is not currently interactive
- (interactive == 0)
-
- 12/29
- -----
-
-flags.h
- - new extern declaration for jobs_m_flag
-
-builtins/{cd,set}.def,doc/{bash.1,bashref.texi}
- - added text clarifying the descriptions of cd -L and -P, suggested by
- Padraig Brady <p@draigbrady.com>
- - slight change to the description of `set -P' about resolving symbolic
- links
-
-lib/readline/doc/rluser.texi
- - Added an example to the programmable completion section: _comp_cd,
- a completion function for cd, with additional verbiage. Text
- includes a reference to the bash_completion project
-
- 1/1/2012
- --------
-jobs.c
- - set_job_status_and_cleanup: note that a job is stopped due to
- SIGTSTP (any_tstped) if job_control is set; there's no need to
- test interactive
-
- 1/5
- ---
-quit.h
- - LASTSIG(): new macro, expands to signal number of last terminating
- signal received (terminating_signal or SIGINT)
-
-trap.c
- - first_pending_trap: returns lowest signal number with a trap pending
- - trapped_signal_received: set to the last trapped signal the shell
- received in trap_handler(); reset to 0 in run_pending_traps
-
-builtins/read.def
- - read_builtin: changes to posix-mode (posixly_correct != 0) to make
- `read' interruptible by a trapped signal. After the trap runs,
- read returns 128+sig and does not assign the partially-read line
- to the named variable(s). From an austin-group discussion started
- by David Korn
-
- 1/11
- ----
-doc/{bash.1,bashref.texi}
- - slight changes to the descriptions of the compat32 and compat40 shell
- options to clarify their meaning
-
- 1/12
- ----
-lib/readline/{colors.[ch],parse-colors.[ch]}
- - new files, part of color infrastructure support
-
-Makefile.in,lib/readline/Makefile.in
- - arrange to have colors.o and parse-colors.o added to readline
- library
-
-{configure,config.h}.in
- - check for stdbool.h, define HAVE_STDBOOL_H if found
-
- 1/14
- ----
-lib/readline/bind.c
- - colored_stats: new bindable variable, enables using colors to
- indicate file type when listing completions
-
-lib/readline/complete.c
- - _rl_colored_stats: new variable, controlled by colored-stats bindable
- variable
- - colored_stat_start, colored_stat_end: new functions to set and reset
- the terminal color appropriately depending on the type of the
- filename to be printed
- - print_filename: changes to print colors if `colored-stats' variable
- set. Changes contributed by Raphael Droz
- <raphael.droz+floss@gmail.com>
-
-lib/readline/readline.c
- - rl_initialize_everything: add call to _rl_parse_colors to parse
- color values out of $LS_COLORS. May have to add to rl_initialize
- to make more dynamic if LS_COLORS changes (which doesn't happen
- very often, if at all)
-
-lib/readline/rlprivate.h
- - _rl_colored_stats: new extern declaration
-
-lib/readline/doc/{readline.3,rluser.texi},doc/bash.1
- - colored-stats: document new bindable readline variable
-
-lib/readline/colors.c
- - _rl_print_color_indicator: call rl_filename_stat_hook before calling
- lstat/stat so we can get color indicators for stuff like
- $HOME/Applications
-
-lib/readline/complete.c
- - stat_char: call rl_filename_stat_hook before calling lstat/stat
-
-findcmd.[ch],execute_cmd.c
- - search_for_command: now takes a second `flags' argument; changed
- header function prototype and callers
- - search_for_command: if (flags & 1), put the command found in $PATH
- into the command hash table (previous default behavior)
-
-execute_cmd.c
- - is_dirname: call search_for_command with flags argument of 0 so it
- doesn't try to put something in the command hash table
-
-bashline.c
- - bash_command_name_stat_hook: a hook function for readline's
- filename_stat_hook that does $PATH searching the same way that
- execute_cmd.c:execute_disk_command() does it, and rewrites the
- passed filename if found. Does not put names into command hash
- table. This allows command name completion to take advantage
- of `visible-stats' and `colored-stats' settings.
- - executable_completion: new function, calls the directory completion
- hook to expand the filename before calling executable_file or
- executable_or_directory; change command_word_completion_function to
- call executable_completion. This allows $HOME/bin/[TAB] to do
- command completion and display alternatives
-
- 1/17
- ----
-pcomplete.c
- - gen_command_matches: now takes a new second argument: the command
- name as deciphered by the programmable completion code and used
- to look up the compspec; changed callers (gen_compspec_completions)
- - gen_shell_function_matches: now takes a new second argument: the
- command that originally caused the completion function to be
- invoked; changed callers (gen_compspec_completions))
- - build_arg_list: now takes a new second argument: the command name
- corresponding to the current compspec; changed callers
- (gen_command_matches, gen_shell_function_matches)
- - build_arg_list: now uses `cmd' argument to create $1 passed to
- invoked command or shell function
- - gen_compspec_completions: if we skipped a null command at the
- beginning of the line (e.g., for completing `>'), add a new word for
- it at the beginning of the word list and increment nw and cw
- appropriately. This is all a partial fix for the shortcoming
- pointed out by Sung Pae <sungpae@gmail.com>
-
- 1/18
- ----
-
-{configure,config.h}.in
- - new check: check for AUDIT_USER_TTY defined in <linux/audit.h>,
- define HAVE_DECL_AUDIT_USER_TTY if both are found
-
-lib/readline/rlconf.h
- - ENABLE_TTY_AUDIT_SUPPORT: new define, allows use of the Linux kernel
- tty auditing system if it's available and enabled
-
-lib/readline/util.c
- - _rl_audit_tty: new function, send a string to the kernel tty audit
- system
-
-lib/readline/rlprivate.h
- - _rl_audit_tty: new extern declaration
-
-lib/readline/readline.c
- - readline: call _rl_audit_tty with line to be returned before returning
- it if the Linux tty audit system is available and it's been enabled
- in rlconf.h Original patch from Miroslav Trmac; recent request
- from Miroslav Lichvar <mlichvar@redhat.com>
-
- 1/21
- ----
-
-lib/readline/readline.c:
- - _rl_dispatch_subseq: add an inter-character timeout for multi-char
- key sequences. Suggested by <rogerx.oss@gmail.com>. Still needs
- work to make a user-settable variable
-
-parse.y
- - shell_getc: make code that uses the pop_alias dependent on ALIAS
- define
-
-variables.h
- - sv_tz: extern define should only depend on HAVE_TZSET
-
-expr.c
- - expr_streval: if ARRAY_VARS is not defined, set lvalue->ind to -1;
- move assignment to `ind' inside define
- - expr_bind_array_element: declaration and uses need to be #ifdef
- ARRAY_VARS
-
-arrayfunc.h
- - AV_ALLOWALL, AV_QUOTED, AV_USEIND: define to 0 if ARRAY_VARS not
- defined; used in subst.c unconditionally
-
-sig.h
- - make the signal blocking functions not dependent on JOB_CONTROL
-
-sig.c
- - sigprocmask: make the replacement definition not dependent on
- JOB_CONTROL
-
-trap.c
- - use BLOCK_SIGNAL/UNBLOCK_SIGNAL instead of code dependent on
- HAVE_POSIX_SIGNALS and BSD signals
-
- 1/24
- ----
-
-print_cmd.c
- - print_redirection_list: change the conditions under which
- r_duplicating_output_word is mapped to r_err_and_out to more or
- less match those used in redir.c. Fixes bug pointed out by
- Dan Douglas <ormaaj@gmail.com>
-
-
- 1/29
- ----
-lib/readline/signals.c
- - _rl_block_sigwinch,_rl_release_sigwinch: don't compile in bodies
- unless SIGWINCH is defined. Fixes bug reported by Pierre Muller
- <pierre.muller@ics-cnrs.unistra.fr>
-
-doc/{bash.1,bashref.texi}
- - small modifications to the introduction to the REDIRECTION section
- to describe how redirections can modify file handles
- - small modification to the section describing base#n to make it
- clearer that n can be denoted using non-numerics. From a posting
- by Linda Walsh <bash@tlinx.org>
-
- 2/2
- ---
-builtins/printf.def
- - printf_builtin: make sure vbuf is intialized and non-null when -v
- is supplied, since other parts of the code assume that it's not
- null (e.g., bind_printf_variable()). Fixes bug reported by Jim
- Avera <james_avera@yahoo.com>
-
- 2/4
- ---
-lib/readline/undo.c
- - _rl_free_undo_list: new function, old body of rl_free_undo_list,
- frees undo entries in UNDO_LIST * passed as argument
- - rl_free_undo_list: call _rl_free_undo_list
-
-lib/readline/rlprivate.h
- - _rl_free_undo_list: new extern declaration
- - _rl_keyseq_timeout: new extern declaration (see below)
-
-lib/readline/misc.c
- - rl_clear_history: new function. Clears the history list and frees
- all associated data similar to history.c:clear_history(), but
- takes rl_undo_list into account and frees and UNDO_LISTs saved as
- `data' members of a history list entry
-
-lib/readline/doc/rltech.texi
- - rl_clear_history: documented
-
-lib/readline/readline.c
- - _rl_keyseq_timeout: new variable to hold intra-key timeout value
- from 1/21 fix; specified in milliseconds. Default value is 500
- - _rl_dispatch_subseq: change to use _rl_keyseq_timeout as intra-key
- timeout if it's greater than 0; no timeout if <= 0
- - _rl_dispatch_subseq: don't check for queued keyboard input if we have
- pushed or pending input, or if we're reading input from a macro
-
-lib/readline/bind.c
- - keyseq-timeout: new bindable variable, shadows _rl_keyseq_timeout
- - string_varlist: add keyseq-timeout
- - sv_seqtimeout: new function to modify value of _rl_keyseq_timeout;
- clamps negative values at 0 for now
- - _rl_get_string_variable_value: return value for keyseq-timeout
-
-doc/bash.1,lib/readline/doc/{rluser.texi,readline.3}
- - keyseq-timeout: documented
-
-lib/readline/isearch.c
- - _rl_isearch_dispatch: modification to fix from 7/18 to not use
- cxt->keymap and cxt->okeymap, since by the time this code is
- executed, they are equal. Use `f' to check for rl_insert or
- unbound func
- - _rl_isearch_dispatch: if we're switching keymaps, not in
- callback mode, and don't have pending or pushed input, use
- _rl_input_queued to resolve a potentially ambiguous key sequence.
- Suggested by Roger Zauner <rogerx.oss@gmail.com>
- - _rl_isearch_dispatch: if we have changed keymaps and resolved to
- an editing function (not self-insert), make sure we stuff the
- right characters back onto the input after changing the keymap
- back so the right editing function is executed after the search
- is terminated. Rest of fix for bug reported by Roger Zauner
- <rogerx.oss@gmail.com>
-
- 2/5
- ---
-builtins/gen-helpfiles.c
- - new file: reads struct builtin and writes the long docs to files
- in the `helpdirs' subdirectory. The filename is given in the
- previously-unused `handle' member of the struct builtin. Links
- with `tmpbuiltins.o', which is created by Makefile to have the
- right long documentation. When not cross-compiling, gets the
- right #defines based on configuration options from config.h instead
- of trying to parse conditional parts of def files. Fixes
- shortcoming pointed out by Andreas Schwab <schwab@linux-m68k.org>
-
-builtins/Makefile.in
- - tmpbuiltins.c: new generated file, created to enable creation of
- separate helpfiles based on correct #defines instead of trying to
- parse conditional parts of def files
- - gen-helpfiles: new program to generate helpfiles, links with
- tmpbuiltins.o
- - HELPFILES_TARGET: new target, substituted by configure to `helpdoc'
- if separate helpfiles requested
- - targets: new target, libbuiltins.a and $(HELPFILES_TARGET)
- - CREATED_OBJECTS: new variable, holds created object files for
- make clean; changed make clean to remove created objects
- - helpdoc: changed to call gen-helpfiles instead of mkbuiltins
-
-Makefile.in
- - when building libbuiltins.a, recursively call make with `targets'
- argument to make sure separate helpfiles get built
-
-configure.in
- - substitute `helpdoc' as value of HELPFILES_TARGET if
- --enable-separate-helpfiles supplied as configure argument
-
-builtins/mkbuiltins.c
- - `-nofunctions': new argument, causes mkbuiltins to not write value
- for function implementing a particular builtin to struct builtin
- and to write document file name to `handle' member of struct builtin
- - no longer writes separate helpfiles; that is left to gen-helpfiles
-
- 2/8
- ---
-subst.c
- - make sure last_command_exit_value is set to a non-zero value before
- any calls to report_error, since `-e' set will short-circuit
- report_error. Fixes bug reported by Ewan Mellor
- <Ewan.Mellor@eu.citrix.com>
-
-variables.c
- - make_local_array_variable: added second argument; if non-zero,
- function will return an existing local associative array variable
- instead of insisting on an indexed array
-
-variable.h,subst.c
- - make_local_array_variable: changed prototype and caller
-
-builtins/declare.def
- - declare_internal: add second arg to call to make_local_array_variable;
- making_array_special, which indicates we're processing an
- assignment like declare a[b]=c. Fixes seg fault resulting from
- a being an already-declared local associative array variable in a
- function. Ubuntu bash bug 928900.
-
- 2/14
- ----
-
-execute_cmd.c
- - execute_command_internal: if redirections into or out of a loop fail,
- don't try to free ofifo_list unless saved_fifo is non-zero. It's
- only valid if saved_fifo is set
-
- 2/15
- ----
-{arrayfunc,braces,variables}.c
- - last_command_exit_value: make sure it's set before any calls to
- report_error, since -e will cause that to exit the shell
-
-builtins/common.c
- - get_job_by_name: call internal_error instead of report_error so this
- doesn't exit the shell
-
- 2/18
- ----
-builtins/evalstring.c
- - parse_and_execute: make sure the file descriptor to be redirected to
- is 1 before calling cat_file. One fix for bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
-parse.y
- - read_token_word: don't return NUMBER if a string of all digits
- resolves to a number that overflows the bounds of an intmax_t.
- Other fix for bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 2/19
- ----
-lib/sh/strtrans.c
- - ansicstr: use 0x7f as the boundary for characters that translate
- directly from ASCII to unicode (\u and \U escapes) instead of
- UCHAR_MAX, since everything >= 0x80 requires more than one byte.
- Bug and fix from John Kearney <dethrophes@web.de>
-
-builtins/printf.def
- - tescape: ditto for printf \u and \U escape sequences
-
- 2/20
- ----
-lib/sh/unicode.c
- - u32toutf8: fix to handle encodings up to six bytes long correctly
- (though technically UTF-8 only has characters up to 4 bytes long).
- Report and fix from John Kearney <dethrophes@web.de>
- - u32toutf8: first argument is now an unsigned 32-bit quantity,
- changed callers (u32cconv) to pass c instead of wc
- - u32reset: new function, resets local static state to uninitialized
- (locale information, currently)
-
-locale.c
- - call u32reset whenever LC_CTYPE/LC_ALL/LANG is changed to reset the
- cached locale information used by u32cconv. From a report from
- John Kearney <dethrophes@web.de>
-
- 2/21
- ----
-doc/{bash,builtins}.1
- - minor changes from Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
-
-lib/sh/unicode.c
- - u32cconv: only assume you can directly call wctomb on the passed
- value if __STDC_ISO_10646__ is defined and the value is <=
- 0x7fffffff
- - stub_charset: return locale as default instead of "ASCII", let
- rest of code decide what to do with it
-
-lib/readline/parens.c
- - _rl_enable_paren_matching: make paren matching work in vi insert
- mode. Bug report from <derflob@derflob.de>
-
- 2/22
- ----
-lib/sh/shquote.c
- - sh_backslash_quote: quote tilde in places where it would be
- expanded. From a report from John Kearney <dethrophes@web.de>
-
- 2/23
- ----
-execute_cmd.c
- - execute_pipeline: wrap the discard_unwind_frame call in #ifdef
- JOB_CONTROL, since the frame is only created if JOB_CONTROL is
- defined. Bug and fix from Doug Kehn <rdkehn@yahoo.com>
-
- 2/25
- ----
-error.c
- - report_error: make sure last_command_exit_value is non-zero before
- we call exit_shell, since the exit trap may reference it. Call
- exit_shell with last_command_exit_value to allow exit statuses
- other than 1
-
-unicode.c
- - stub_charset: use local static buffer to hold charset, don't change
- value returned by get_locale_var. Based on idea and code from
- John Kearney <dethrophes@web.de>
- - u32toutf16: function to convert unsigned 32-bit value (unicode) to
- UTF-16. From John Kearney <dethrophes@web.de>
- - u32cconv: call u32toutf16 if __STDC_ISO_10646__ defined and wchar_t
- is two bytes, send result to wcstombs, return if not encoding error.
- From John Kearney <dethrophes@web.de>
- - u32cconv: return UTF-8 conversion if iconv conversion to local
- charset is unsupported
-
- 3/2
- ---
-lib/readline/complete.c
- - print_filename: if there is no directory hook, but there is a stat
- hook, and we want to append a slash to directories, call the stat
- hook before calling path_isdir on the expanded directory name.
- Report and pointer to fix from Steve Rago <sar@nec-labs.com>
-
- 3/3
- ---
-builtins/evalstring.c
- - parse_and_execute: fix to change of 2/18: make sure the file
- descriptor being redirected to is 0 before calling cat_file when
- we see something like $(< file). Real fix for bug reported by
- Dan Douglas <ormaaj@gmail.com>
-
-subst.c
- - parameter_brace_patsub: run the replacement string through quote
- removal even if the expansion is within double quotes, because
- the parser and string extract functions treat the quotes and
- backslashes as special. If they're treated as special, quote
- removal should remove them (this is the Posix position and
- compatible with ksh93). THIS IS NOT BACKWARDS COMPATIBLE.
-
- 3/4
- ---
-lib/readline/complete.c
- - rl_menu_complete: fix to make show-all-if-ambiguous and
- menu-complete-display-prefix work together if both are set. Fix
- from Sami Pietila <sami.pietila@gmail.com>
-
- 3/5
- ---
-bashline.c
- - dircomplete_expand_relpath: new variable, if non-zero, means that
- `shopt -s direxpand' should expand relative pathnames. Zero by
- default, not user-settable yet
- - bash_directory_completion_hook: if we have a relative pathname that
- isn't changed by canonicalization or spell checking after being
- appended to $PWD, then don't change what the user typed. Controlled
- by dircomplete_expand_relpath
-
- 3/7
- ---
-m4/timespec.m4
- - new macros, cribbed from gnulib and coreutils: find out whether we
- have `struct timespec' and what file includes it
-
-m4/stat-time.m4
- - new macros, cribbed from gnulib and coreutils: find out whether the
- mtime/atime/ctime/etctime fields of struct stat are of type
- struct timespec, and what the name is
-
-include/stat-time.h
- - new file, cribbed from gnulib, with additions from coreutils: include
- the right file to get the struct timespec define, or provide our own
- replacement. Provides a bunch of inline functions to turn the
- appropriate members of struct stat into `struct timespec' values,
- zeroing out the tv_nsec field if necessary
-
-test.c
- - include "stat-time.h" for the nanosecond timestamp resolution stuff
- - stat_mtime: new function, returns struct stat and the mod time
- normalized into a `struct timespec' for the filename passed as the
- first argument
- - filecomp: call stat_mtime instead of sh_stat for each filename
- argument to get the mtime as a struct timespec
- - filecomp: call timespec_cmp instead of using a straight arithmetic
- comparison for the -nt and -ot operators, using timespec returned by
- stat_mtime. Added functionality requested by by Werner Fink
- <werner@suse.de> for systems that can support it
-
- 3/10
- ----
-include/posixdir.h
- - REAL_DIR_ENTRY: remove dependency on _POSIX_SOURCE, only use feature
- test macros to decide whether dirent.d_ino is present and usable;
- define D_INO_AVAILABLE. Report and fix from Fabrizion Gennari
- <fabrizio.ge@tiscali.it>
- - D_FILENO_AVAILABLE: define if we can use dirent.d_fileno
-
-lib/sh/getcwd.c
- - use D_FILENO_AVAILABLE to decide whether or not to compile in
- _path_checkino and whether or not to call it. Report and initial
- fix from Fabrizion Gennari <fabrizio.ge@tiscali.it>
-
-lib/readline/signals.c
- - make sure all occurrences of SIGWINCH are protected by #ifdef
-
-sig.c
- - make sure all occurrences of SIGCHLD are protected by #ifdef
-
-nojobs.c
- - make sure SA_RESTART is defined to 0 if the OS doesn't define it
-
-version.c
- - show_shell_version: don't use string literals in printf, use %s.
- Has added benefit of removing newline from string to be translated
-
-trap.c
- - queue_sigchld_trap: new function, increments the number of pending
- SIGCHLD signals by the argument, which is by convention the number
- of children reaped in a call to waitchld()
-
-trap.h
- - queue_sigchld_trap: new extern declaration
-
-jobs.c
- - waitchld: if called from the SIGCHLD signal handler (sigchld > 0),
- then call queue_sigchld_trap to avoid running the trap in a signal
- handler context. Report and original fix from Siddhesh Poyarekar
- <siddhesh@redhat.com>
-
-lib/sh/unicode.c
- - u32tocesc: take an unsigned 32-bit quantity and encode it using
- ISO C99 string notation (\u/\U)
- - u32cconv: call u32tocesc as a fallback instead of u32cchar
- - u32cconv: call u32tocesc if iconv cannot convert the character.
- Maybe do the same thing if iconv_open fails
- - u32reset: call iconv_close on localconv if u32init == 1
-
- 3/11
- ----
-config-top.h
- - CHECKWINSIZE_DEFAULT: new define, set to initial value of
- check_window_size (shopt checkwinsize): 0 for off, 1 for on.
- Default is 0
-
-{jobs,nojobs}.c
- - check_window_size: default initial value to CHECKWINSIZE_DEFAULT
-
- 3/13
- ----
-doc/bashref.texi
- - change text referring to the copying restrictions to that
- recommended by the FSF (no Front-Cover Texts and no Back-Cover
- Texts)
-
-lib/readline/doc/{history,rlman,rluserman}.texi
- - change text referring to the copying restrictions to that
- recommended by the FSF (no Front-Cover Texts and no Back-Cover
- Texts)
-
- 3/15
- ----
-array.c
- - LASTREF_START: new macro to set the starting position for an array
- traversal to `lastref' if that's valid, and to the start of the array
- if not. Used in array_reference, array_insert, array_remove
- - array_remove: try to be a little smarter with lastref instead of
- unconditionally invalidating it
-
- 3/16
- ----
-array.c
- - array_insert: fix memory leak by deleting element to be added in the
- case of an error
-
- 3/18
- ----
-lib/sh/mbschr.c
- - mbschr: don't call mbrlen unless is_basic is false; devolves to a
- straight character-by-character run through the string
-
- 3/19
- ----
-stringlib.c
- - substring: use memcpy instead of strncpy, since we know the length
- and are going to add our own NUL terminator
-
- 3/20
- ----
-subst.c
- - parameter_brace_expand_rhs: if expand_string_for_rhs returns a quoted
- null string (a list with one element for which
- QUOTED_NULL(list->word->word) returns true), return the quoted null
- and set the flags in the returned word to indicate it. Fixes bug
- reported by Mark Edgar <medgar123@gmail.com>
-
-lib/sh/tmpfile.c
- - use random(3) instead of get_random_number to avoid perturbing the
- random sequence you get using $RANDOM. Bug report and fix from
- Jurij Mihelic <jurij.mihelic@fri.uni-lj.si>
-
- 3/21
- ----
-config-top.h
- - OPTIMIZE_SEQUENTIAL_ARRAY_ASSIGNMENT: define to 1 to optimize
- sequential indexed array assignment patterns. Defined to 1 by
- default
-
-array.c
- - array_insert: if OPTIMIZE_SEQUENTIAL_ARRAY_ASSIGNMENT is defined,
- start the search at lastref (see change from 3/15)
-
- 3/27
- ----
-print_cmd.c
- - debug_print_word_list: new debugging function, prints a word list
- preceded by an optional string and using a caller-specified
- separator
-
- 4/1
- ---
-command.h
- - W_ASSNGLOBAL: new flag, set to indicate declare -g
-
-execute_cmd.c
- - fix_assignment_words: note that we have a -g argument to an assignment
- builtin and set the W_ASSNGLOBAL flag in the variable word
-
-subst.c
- - dump_word_flags: print out W_ASSNGLOBAL if present
- - do_assignment_internal: only set ASS_MKLOCAL if W_ASSIGNARG is set
- and W_ASSNGLOBAL is not. Don't want to create a local variable even
- if variable_context is non-zero if ASSNGLOBAL is set. Fixes bug
- reported by Bill Gradwohl <bill@ycc.com>
-
- 4/7
- ---
-lib/readline/readline.c
- - _rl_dispatch_subseq: make the `keyseq-timeout' variable apply to
- ESC processing when in vi mode. After hitting ESC, readline will
- wait up to _rl_keyseq_timeout*1000 microseconds (if set) for
- additional input before dispatching on the ESC and switching to
- command/movement mode. Completes timeout work suggested by
- <rogerx.oss@gmail.com>; this prompted by report from Barry Downes
- <barry.downes@gmail.com>
-
-lib/sh/shmbchar.c
- - sh_mbsnlen: new function, returns the number of (possibly multibyte)
- characters in a passed string with a passed length, examining at most
- maxlen (third argument) bytes
-
-externs.h
- - sh_mbsnlen: extern declaration for new function
-
-shell.c
- - exit_shell: call maybe_save_shell_history if remember_on_history is
- set, not just in interactive shells. That means the history is
- saved if history is enabled, regardless of whether or not the shell
- is interactive
-
-doc/{bash.1,bashref.texi}
- - TMOUT: fix description to make it explicit that TMOUT is the timeout
- period for a complete line of input, not just any input. Fixes
- problem reported in Ubuntu bug 957303:
- https://bugs.launchpad.net/ubuntu/+source/bash/+bug/957303
- - HISTFILE: document change to write history list to history file in
- any shell with history enabled, not just interactive shells. This
- seems to be more logical behavior. Suggested by Greg Wooledge
- <wooledg@eeg.ccf.org>
-
- 4/12
- ----
-lib/readline/colors.h
- - only include stdbool.h if HAVE_STDBOOL_H is defined
- - if HAVE_STDBOOL_H is not defined, provide enough definition for the
- library to use `bool', `true', and `false'
-
-lib/readline/parse-colors.[ch]
- - don't try to include <stdbool.h> at all; rely on colors.h to do it
-
-lib/sh/snprintf.c
- - vsnprintf_internal: only treat '0' as a flag to indicate zero padding
- if `.' hasn't been encountered ((flags&PF_DOT) == 0); otherwise treat
- it as the first digit of a precision specifier. Fixes bug reported
- by Petr Sumbera <petr.sumbera@sun.com>
-
- 4/15
- ----
-lib/sh/snprintf.c
- - vsnprintf_internal: if the '0' and '-' flags both occur, the '0'
- flag is ignored -- Posix. Start of a series of fixes based on
- tests and patches from Petr Sumbera <petr.sumbera@sun.com>
- - PUT_PLUS: make sure PF_PLUS flag is specified before putting the `+'
- - vsnprintf_internal: when '+' is read as a flag, don't set right-
- justify flag if the LADJUST (`-') flag has already been supplied
- - floating: make sure to output space padding before the `+', zero
- padding after
- - exponent: make sure to output space padding before the `+', zero
- padding after
- - exponent: only subtract one from the width for the decimal point
- if we're really going to print one
- - floating: use presence of PF_PLUS flag to decide whether to account
- for the `+' in the padded field width. Ditto for exponent()
-
- 4/16
- ----
-lib/sh/snprintf.c
- - vsnprint_internal: only reduce precision by 1 when processing the `g'
- format if it's > 0. A precision of 0 should stay 0; otherwise it
- gets set to -1 (NOT_FOUND) and converted to the default
- - number, lnumber: if an explicit precision is supplied, turn off the
- zero-padding flag and set the pad character back to space
- - number, lnumber: only account for a `+' when performing the field
- width calculation if the coversion is base 10; we don't add a `+'
- for other bases
-
- 4/18
- ----
-tests/printf3.sub
- - try using "perl -e 'print time'" to get the current time in seconds
- since the epoch if "date +%s" is not available (solaris 8-10)
-
- 4/19
- ----
-tests/run-printf
- - use cat -v instead of relying on diff -a being available to convert
- control characters to ascii and avoid the dreaded "Binary files
- /tmp/xx and printf.right differ"
-
- 4/20
- ----
-lib/sh/strftime.c
- - incoporated new version from Aharon Robbins <arnold@skeeve.com>
-
- 4/22
- ----
-doc/{bash.1,bashref.texi}
- - slight change to the description of /dev/tcp and /dev/udp
-
-subst.c
- - match_wpattern: logic fix to the calculation of `simple' (was |=,
- needs to be &=). Bug report from Mike Frysinger <vapier@gentoo.org>,
- fix from Andreas Schwab <schwab@linux-m68k.org>
-
-bashline.c
- - bash_filename_stat_hook: add code from bash_directory_completion_hook
- that performs pathname canonicalization in the same way that cd and
- other builtins will do
-
- 4/25
- ----
-execute_cmd.c
- - execute_pipeline: change the call to move_to_high_fd to make it use
- getdtablesize() and to not stomp on existing open file descriptors,
- like the fd the shell is using to read a script. Bug report from
- Greg Wooledge <wooledg@eeg.ccf.org>
-
- 5/6
- ---
-subst.c
- - expand_word_internal: case '$': after calling param_expand and
- setting had_quoted_null, set TEMP to null. The code that builds the
- returned string at the end of the function will take care of making
- and returning a quoted null string if there's nothing else in
- ISTRING. If there is, the quoted null should just go away. Part of
- fix for bug reported by Ruediger Kuhlmann <RKuhlmann@orga-systems.com>
- - expand_word_internal: when processing ISTRING to build return value,
- only set W_HASQUOTEDNULL in the returned word flags if the word is
- a quoted null string AND had_quoted_null is set. Rest of fix
-
- 5/9
- ---
-variables.c
- - bind_variable_internal: if we get an array variable here (implicit
- assignment to index 0), call make_array_variable_value, which
- dummies up a fake SHELL_VAR * from array[0]. This matters when
- we're appending and have to use the current value
- - bind_variable_internal: after computing the new value, treat assoc
- variables with higher precedence than simple array variables; it
- might be that a variable has both attributes set
-
-arrayfunc.c
- - bind_array_var_internal: break code out that handles creating the
- new value to be assigned to an array variable index into a new
- function, make_array_variable_value. This handles creating a
- dummy SHELL_VAR * for implicit array[0] assignment. Fixes bug
- reported by Dan Douglas <ormaaj@gmail.com>
-
-arrayfunc.h
- - make_array_variable_value: new extern declaration
-
- 5/19
- ----
-variables.c
- - bind_int_variable: if an assignment statement like x=y comes in
- from the expression evaluator, and x is an array, handle it like
- x[0]=y. Fixes bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 5/24
- ----
-
-braces.c
- - mkseq: handle possible overflow and break the sequence generating
- loop if it occurs. Fixes OpenSUSE bug 763591:
- https://bugzilla.novell.com/show_bug.cgi?id=763591
-
- 5/25
- ----
-Makefile.in
- - LDFLAGS_FOR_BUILD: add to compilation recipes for build tools
- buildversion, mksignames, mksyntax
- - LDFLAGS_FOR_BUILD: add to compilation recipes for test tools
- recho, zecho, printenv, xcase
-
-builtins/Makefile.in
- - LDFLAGS_FOR_BUILD: add to compilation recipes for build tools
- gen-helpfiles, psize.aux
-
-variables.c
- - bind_int_variable: if LHS is a simple variable name without an array
- reference, but resolves to an array variable, call
- bind_array_variable with index 0 to make x=1 equivalent to x[0]=1.
- Fixes bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 5/27
- ----
-subst.c
- - expand_word_internal: make sure has_dollar_at doesn't get reset before
- recursive calls to param_expand or expand_word_internal, since it has
- to save state of what came before. Use temp variable and make sure
- has_dollar_at is incremented if recursive call processes "$@".
- Fixes bug reported by gregrwm <backuppc-users@whitleymott.net> and
- supplemented by Dan Douglas <ormaaj@gmail.com>
-
-doc/{bash.1,bashref.texi}
- - changes to the description of substring expansion inspired by
- suggestions from Bill Gradwohl <bill@ycc.com>
-
-doc/bashref.texi
- - added substring expansion examples inspired by suggestions from
- Bill Gradwohl <bill@ycc.com>
-
-variables.c
- - find_shell_variable: search for a variable in the list of shell
- contexts, ignore the temporary environment
- - find_variable_tempenv: search for a variable in the list of shell
- contexts, force search of the temporary environment
- - find_variable_notempenv: search for a variable in the list of shell
- contexts, don't force search of the temporary environment
-
-variables.h
- - find_shell_variable: extern declaration
- - find_variable_tempenv: extern declaration
- - find_variable_notempenv: extern declaration
-
-arrayfunc.c
- - bind_array_variable: call find_shell_variable instead of calling
- var_lookup directly
-
-findcmd.c
- - search_for_command: call find_variable_tempenv instead of
- find_variable_internal directly
- - _find_user_command_internal: call find_variable_tempenv instead of
- find_variable_internal directly
-
-builtins/setattr.def
- - set_var_attribute: call find_variable_notempenv instead of
- find_variable_internal directly
- - show_name_attributes: call find_variable_tempenv instead of
- find_variable_internal directly
-
- 6/1
- ---
-sig.c
- - termsig_handler: don't try to save the shell history on a terminating
- signal any more, since it just causes too many problems on Linux
- systems using glibc and glibc malloc
-
-lib/readline/vi_mode.c
- - rl_vi_change_to: change to correctly redo `cc', since `c' is not a vi
- motion character. From Red Hat bug 813289
- - rl_vi_delete_to: change to correctly redo `dd', since `d' is not a vi
- motion character
- - rl_vi_yank_to: change to correctly redo `yy', since `y' is not a vi
- motion character
-
- 6/4
- ---
-lib/sh/mktime.c
- - current versions of VMS do not need to include <stddef.h>. Fix from
- John E. Malmberg <wb8tyw@qsl.net>
-
- 6/5
- ---
-lib/sh/eaccess.c
- - sh_stat: instead of using a static buffer to do the DEV_FD_PREFIX
- translation, use a dynamically-allocated buffer that we keep
- resizing. Fixes potential security hole reported by David Leverton
- <levertond@googlemail.com>
-
- 6/5
- ---
-braces.c
- - expand_seqterm: check errno == ERANGE after calling strtoimax for
- rhs and incr. Part of a set of fixes from Scott McMillan
- <scotty.mcmillan@gmail.com>
- - expand_seqterm: incr now of type `intmax_t', which changes
- arguments to mkseq
- - mkseq: a better fix for detecting overflow and underflow since it's
- undefined in C and compilers `optimize' out overflow checks. Uses
- ADDOVERFLOW and SUBOVERFLOW macros
- - mkseq: use sh_imaxabs (new macro) instead of abs() for intmax_t
- variables
- - mkseq: don't allow incr to be converted to -INTMAX_MIN
- - mkseq: make sure that strvec_create isn't called with a size argument
- greater than INT_MAX, since it only takes an int
-
- 6/6
- ---
-braces.c
- - mkseq: try and be smarter about not overallocating elements in
- the return array if the increment is not 1 or -1
-
- 6/7
- ---
-parse.y
- - history_delimiting_chars: if the parser says we're in the middle of
- a compound assignment (PST_COMPASSIGN), just return a space to avoid
- adding a stray semicolon to the history entry. Fixes bug reported
- by "Davide Brini" <dave_br@gmx.com>
-
- 6/8
- ---
-bashline.c
- - bash_directory_completion_hook: don't attempt spelling correction
- on the directory name unless the direxpand option is set and we are
- going to replace the directory name with the corrected one in the
- readline line. Suggested by Linda Walsh <bash@tlinx.org>
-
-lib/sh/shquote.c
- - sh_backslash_quote: now takes a third argument: flags. If non-zero,
- tildes are not backslash-escaped. Have to handle both printf %q,
- where they should be escaped, and filename completion, where they
- should not when used as usernames
-
-externs.h
- - sh_backslash_quote: declaration now takes a third argument
-
-builtins/printf.def
- - printf_builtin: call sh_backslash_quote with 1 as third argument
- so tildes get escaped
-
-{bashline,bracecomp}.c
- - call sh_backslash_quote with 0 as third argument so tildes are not
- escaped in completed words
-
-doc/bash.1
- - add `coproc' to the list of reserved words. From a report by
- Jens Schweikhardt <schweikh@schweikhardt.net>
-
- 6/10
- ----
-execute_cmd.c
- - line_number_for_err_trap: now global, so parse_and_execute can save
- and restore it with unwind-protect
-
-builtins/evalstring.c
- - parse_prologue: save and restore line_number_for_err_trap along
- with line_number
- - restore_lastcom: new function, unwind-protect to restore
- the_printed_command_except_trap
- - parse_prologue: use restore_lastcom to save and restore the value
- of the_printed_command_except_trap around calls to parse_and_execute
- (eval/source/.)
-
- 6/15
- ----
-lib/readline/complete.c
- - complete_fncmp: change filename comparison code to understand
- multibyte characters, even when doing case-sensitive or case-mapping
- comparisons. Fixes problem reported by Nikolay Shirokovskiy
- <nshyrokovskiy@gmail.com>
-
- 6/20
- ----
-builtins/mapfile.def
- - mapfile: move the line count increment and check for having read
- the specified number of lines to the end of the loop to avoid
- reading an additional line with zgetline. Fixes bug reported by
- Dan Douglas <ormaaj@gmail.com>
-
- 6/21
- ----
-
-execute_cmd.c
- - execute_pipeline: make sure `lastpipe_flag' is initialized to 0 on
- all systems, since it's tested later in the function. Fixes bug
- reported by John E. Malmberg <wb8tyw@qsl.net>
-
- 6/22
- ----
-mailcheck.c
- - file_mod_date_changed: return 0 right away if mailstat() does not
- return success. Fixes bug with using uninitialized values reported
- by szymon.kalasz@uj.edu.pl
-
-builtins/set.def
- - the `monitor' option is not available when the shell is compiled
- without job control, since the underlying `m' flag is not available
-
-nojobs.c
- - job_control: now declared as int variable, initialized to 0, never
- modified
-
-jobs.h
- - job_control: extern declaration no longer dependent on JOB_CONTROL
-
-execute_cmd.c
- - execute_pipeline: made necessary changes so `lastpipe' shell option
- is now available in all shells, even those compiled without
- JOB_CONTROL defined
-
- 6/23
- ----
-lib/glob/glob.c
- - glob_filename: check for interrupts before returning if glob_vector
- returns NULL or an error. Bug reported by Serge van den Boom
- <svdb@stack.nl>, fix from Andreas Schwab <schwab@linux-m68k.org>
- - call run_pending_traps after each call to QUIT or test of
- interrupt_state, like we do in mainline shell code
- - glob_vector: don't call QUIT; in `if (lose)' code block; just free
- memory, return NULL, and let callers deal with interrupt_state or
- other signals and traps
-
- 6/25
- ----
-lib/readline/input.c
- - rl_read_key: restructure the loop that calls the event hook a little,
- so that the hook is called only after rl_gather_tyi returns no input,
- and any pending input is returned first. This results in better
- efficiency for processing pending input without calling the hook
- on every input character as bash-4.1 did. From a report from
- Max Horn <max@quendi.de>
-
- 6/26
- ----
-trap.c
- - signal_is_pending: return TRUE if SIG argument has been received and
- a trap is waiting to execute
-
-trap.h
- - signal_is_pending: extern declaration
-
-lib/glob/glob.c
- - glob_vector: check for pending SIGINT trap each time through the loop,
- just like we check for interrupt_state or terminating_signal, and
- set `lose = 1' so we clean up after ourselves and interrupt the
- operation before running the trap. This may require a change later,
- maybe call run_pending_traps and do that if run_pending_traps returns?
-
-variables.c
- - sv_histtimefmt: set history_comment_character to default (`#') if
- it's 0 when we're turning on history timestamps. The history code
- uses the history comment character to prefix timestamps, and
- leaving it at 0 effectively removes them from the history. From a
- report to help-bash by Dennis Williamson <dennistwilliamson@gmail.com>
-
- 6/27
- ----
-lib/readline/signals.c
- - rl_maybe_restore_sighandler: new function, sets handler for SIG to
- HANDLER->sa_handler only if it's not SIG_IGN. Needs to be called
- on same signals set using rl_maybe_set_sighandler, which does not
- override an existing SIG_IGN handler (SIGALRM is ok since it does
- the check inline; doesn't mess with SIGWINCH)
-
- 6/30
- ----
-variables.h
- - additional defines for the new `nameref' variable attribute
- (att_nameref): nameref_p, nameref_cell, var_setref
-
-variables.c
- - find_variable_nameref: resolve SHELL_VAR V through chain of namerefs
- - find_variable_last_nameref: resolve variable NAME until last in a
- chain of possibly more than one nameref starting at shell_variables
- - find_global_variable_last_nameref: resolve variable NAME until last
- in a chain of possibly more than one nameref starting at
- global_variables
- - find_nameref_at_context: resolve SHELL_VAR V through chain of namerefs
- in a specific variable context (usually a local variable hash table)
- - find_variable_nameref_context: resolve SHELL_VAR V through chain of
- namerefs following a chain of varible contexts
- - find_variable_last_nameref_context: resolve SHELL_VAR V as in
- find_variable_last_context, but return the final nameref instead of
- what the final nameref resolves to
- - find_variable_tempenv, find_variable_notempenv, find_global_variable,
- find_shell_variable, find_variable: modified to follow namerefs
- - find_global_variable_noref: look up a global variable without following
- any namerefs
- - find_variable_noref: look up a shell variable without following any
- namerefs
- - bind_variable_internal: modify to follow a chain of namerefs in the
- global variables table; change to handle assignments to a nameref by
- following nameref chain
- - bind_variable: modify to follow chain of namerefs when binding to a
- local variable
- - unbind_variable: changes to unset nameref variables (unsets both
- nameref and variable it resolves to)
-
-subst.c
- - parameter_brace_expand_word: change to handle expanding nameref whose
- value is x[n]
- - parameter_brace_expand_indir: change to expand in ksh93-compatible
- way if variable to be indirected is nameref and a simple (non-array)
- expansion
- - param_expand: change to expand $foo where foo is a nameref whose value
- is x[n]
-
-execute_cmd.c
- - execute_for_command: changes to implement ksh93 semantics when index
- variable is a nameref
-
-builtins/setattr.def
- - show_var_attributes: change to add `n' to flags list if att_nameref
- is set
-
-builtins/set.def
- - unset_builtin: changes to error messages to follow nameref variables
-
-builtins/declare.def
- - document new -n option
- - declare_internal: new `-n' and `+n' options
- - declare_internal: handle declare -n var[=value] and
- declare +n var[=value] for existing and non-existant variables.
- Enforce restriction that nameref variables cannot be arrays.
- Implement semi-peculiar ksh93 semantics for typeset +n ref=value
-
- 7/5
- ---
-variables.c
- - unbind_variable: unset whatever a nameref resolves to, leaving the
- nameref variable itself alone
- - unbind_nameref: new function, unsets a nameref variable, not the
- variable it references
-
-variables.h
- - unbind_nameref: extern declaration
-
-builtins/set.def
- - unset_builtin: modify to add -n option, which calls unbind_nameref
- leaving unbind_variable for the usual case. This required slight
- changes and additions to the test suite
-
-doc/{bash.1,bashref.texi}
- - document namerefs and typeset/declare/local/unset -n
-
- 7/13
- ----
-lib/sh/casemod.c
- - include shmbchar.h for is_basic and supporting pieces
- - sh_casemod: use _to_wupper and _to_wlower to convert wide character
- case instead of TOUPPER and TOLOWER. Fixes bug reported by
- Dennis Williamson <dennistwilliamson@gmail.com>, fix from
- Andreas Schwab <schwab@linux-m68k.org>
- - cval: short-circuit and return ascii value if is_basic tests true
- - sh_casemod: short-circuit and use non-multibyte case modification
- and toggling code if is_basic tests true
-
-lib/readline/signals.c
- - _rl_{block,release}_sigint: remove the code that actually blocks and
- releases the signals, since we defer signal handling until calls to
- RL_CHECK_SIGNALS()
-
-lib/readline/{callback,readline,util}.c
- - if HAVE_POSIX_SIGSETJMP is defined, use sigsetjmp/siglongjmp without
- saving and restoring the signal mask instead of setjmp/longjmp
-
-lib/readline/rltty.c
- - prepare_terminal_settings: don't mess with IXOFF setting if
- USE_XON_XOFF defined
-
-doc/{bash.1,bashref.texi}
- - add some text to the description of set -e clarifying its effect
- on shell functions and shell function execution. Suggested by
- Rainer Blome <rainer.blome@gmx.de>
-
-bashline.c
- - edit_and_execute_command: increment current_command_line_count before
- adding partial line to command history (for command-oriented-history
- because of rl_newline at beginning of function), then reset it to 0
- before adding the dummy history entry to make sure the dummy entry
- doesn't get added to previous incomplete command. Partial fix for
- problem reported by Peng Yu <pengyu.ut@gmail.com>
-
- 7/24
- ----
-configure.in
- - interix: define RECYCLES_PIDS. Based on a report from Michael
- Haubenwallner <michael.haubenwallner@salomon.at>
-
- 7/26
- ----
-jobs.c
- - make_child: call bgp_delete on the newly-created pid unconditionally.
- Some systems reuse pids before cycling through an entire set of
- CHILD_MAX/_SC_CHILD_MAX unique pids. This is no longer dependent
- on RECYCLES_PIDS. Based on a report from Michael Haubenwallner
- <michael.haubenwallner@salomon.at>
-
-support/shobj-conf
- - Mac OS X: drop MACOSX_DEPLOYMENT_TARGET=10.3 from the LDFLAGS. We
- can finally kill Panther
-
- 7/28
- ----
-subst.c
- - command_substitute: make sure last_made_pid gets reset if make_child
- fails
-
-execute_cmd.c
- - execute_command_internal: case cm_simple: decide whether or not to
- wait_for a child if already_making_children is non-zero, indicates
- that there is an unwaited-for child. More of fix for bug report
- from Michael Haubenwallner <michael.haubenwallner@salomon.at>
-
-jobs.c
- - make_child: call delete_old_job (new_pid) unconditionally, don't
- bother to check whether or not pid wrap occurred. Rest of fix for
- bug report from Michael Haubenwallner
- <michael.haubenwallner@salomon.at>
-
- 7/29
- ----
-shell.c
- - subshell_exit: new function, exits the shell (via call to sh_exit())
- after calling any defined exit trap
-
-externs.h
- - subshell_exit: new extern declaration
-
-execute_cmd.c
- - execute_command_internal: make sure to call subshell_exit for
- {} group commands executed asynchronously (&). Part of fix for
- EXIT trap bug reported by Maarten Billemont <lhunath@lyndir.com>
-
-sig.c
- - reset_terminating_signals: make sure to set termsigs_initialized back
- to 0, so a subsequent call to initialize_terminating_signals works
- right. Rest of fix for bug reported by Maarten Billemont
- <lhunath@lyndir.com>
-
-{execute_cmd,general,jobs,mailcheck,mksyntax,test}.c
-builtins/{cd,fc,pushd,ulimit}.def
-lib/malloc/getpagesize.h
-lib/sh/{clktck,fpurge,inet_aton,mailstat,oslib,pathcanon,pathphys,spell,strerror}.c
- - make inclusion of <sys/param.h> dependent on HAVE_SYS_PARAM_H
- consistently
-
- 8/6
- ---
-lib/readline/histexpand.c
- - history_expand_internal: now takes an additional argument saying
- whether the history expansion occurs within a quoted string, set to
- the open quote character
- - history_expand_internal: use new argument instead of checking prev
- char and initializing quoted_search_delimiter, pass qc directly to
- get_history_event, where it allows a matching quote to terminate a
- string defining an event
- - history_expand: change single-quote handling code so that if
- history_quotes_inhibit_expansion is 0, single quotes are treated
- like double quotes
- - history_expand: change call to history_expand_internal to pass new
- argument of `"' if double-quoted string, `'' if single-quoted string;
- this lets history_expand decide what is a quoted string and what
- is not
-
- 8/7
- ---
-configure.in
- - AC_CANONICAL_BUILD: invoke for later use
-
-lib/readline/macro.c
- - _rl_prev_macro_key: new function, inverse of _rl_next_macro_key:
- backs up the index into the current macro by 1
-
-lib/readline/rlprivate.h
- - _rl_prev_macro_key: extern declaration
-
-
-lib/readline/readline.c
- - _rl_dispatch_subseq, _rl_subseq_result: don't call _rl_unget_char
- if we're currently reading from a macro; call _rl_prev_macro_key
- instead. Fixes bug reported by Clark Wang <clark.wang@oracle.com>
-
- 8/13
- ----
-builtins/evalstring.c
- - evalstring(): new function, wrapper around parse_and_execute.
- make sure we handle cases where parse_and_execute can call `return'
- and short-circuit without cleaning up properly. We call
- parse_and_execute_cleanup() then jump to the previous-saved return
- location
-
-builtins/common.h
- - extern declaration for evalstring()
-
-builtins/eval.def
- - eval_builtin: make sure we handle `eval " ... return"' in contexts
- where `return' is valid by calling evalstring(). Fixes bug with
- `eval return' in sourced files reported by Clark Wang
- <dearvoid@gmail.com>
-
-trap.c
- - run_pending_traps: call evalstring instead of parse_and_execute.
- XXX - still needs to handle saving and restoring token state in the
- presence of `return'; could use unwind_protects for that
-
-builtins/mapfile.def
- - run_callback: call evalstring instead of parse_and_execute
-
- 8/15
- ----
-bashline.c
- - bash_filename_stat_hook: make sure we don't free local_dirname
- before using it to canonicalize any expanded filename. Make sure
- it always points to *dirname and only free it if we're replacing
- it.
-
-lib/readline/complete.c
- - append_to_match: make sure we call rl_filename_stat_hook with
- newly-allocated memory to avoid problems with freeing it twice
-
- 8/17
- ----
-variables.c,config-top.h
- - if ARRAY_EXPORT is defined to 1 when variables.c is compiled, the
- code that allows indexed arrays to be exported is enabled and
- included
-
- 8/19
- ----
-shell.c
- - call start_debugger from main() only if dollar_vars[1] != 0 (close
- enough to a non-interactive shell, since we can be interactive with
- -i while running a shell script). Fixes oddity reported by
- Techlive Zheng <techlivezheng@gmail.com>
-
- 8/20
- ----
-arrayfunc.c
- - quote_array_assignment_chars: don't bother quoting if the word has
- not been marked as an assignment (W_ASSIGNMENT)
- - quote_array_assignment_chars: turn on W_NOGLOB in the word flags
- so assignment statements don't undergo globbing. Partial fix for
- problems reported by Dan Douglas <ormaaj@gmail.com>
-
- 8/21
- ----
-command.h
- - W_NOBRACE: new word flag that means to inhibit brace expansion
-
-subst.c
- - brace_expand_word_list: suppress brace expansion for words with
- W_NOBRACE flag
-
- 8/22
- ----
-builtins/read.def
- - read_builtin: don't call dequote_string on what we've read, even if
- we saw an escape character, unless (input_string && *input_string).
- We may have escaped an IFS whitespace character. Fixes seg fault
- reported by <armandsl@gmail.com>
-
-execute_cmd.c
- - execute_command_internal: set the_printed_command_except trap when
- about to execute a ( ... ) user subshell. For now, set it only if
- ERR is trapped; can relax that later. Fixes bug reported by
- Mike Frysinger <vapier@gentoo.org>
-
- 8/23
- ----
-jobs.c
- - remove references to first_pid and pid_wrap, since we're not using
- them for anything anymore
-
- 8/24
- ----
-subst.c
- - changes for W_NOBRACE everywhere appropriate: so it can be displayed
- for debugging, and passed out of expand_word_internal
-
-doc/{bash.1,bashref.texi}
- - small changes to make it clearer that the = and == operators are
- equivalent, and will cause pattern matching when used with [[.
- From a question from Michal Soltys <soltys@ziu.info>
-
-doc/bashref.texi
- - some small formatting changes from Karl Berry <karl@freefriends.org>
-
- 8/27
- ----
-lib/readline/doc/{history,rlman,rluserman}.texi
- - some small formatting changes from Karl Berry <karl@freefriends.org>
-
-arrayfunc.c
- - assign_array_element_internal, assign_compound_array_list,
- unbind_array_element, array_value_internal: changes to make
- assignment statements to negative indices (a[-1]=2) and unsetting
- array elements using negative indices (unset 'a[-1]') work.
- From suggestions by Dennis Williamson <dennistwilliamson@gmail.com>
- and Chris F. A. Johnson <chris@cfajohnson.com>
-
-subst.c
- - array_length_reference: changes to make length references to array
- elements using negative indices (${#a[-1]}) work
-
- 8/28
- ----
-doc/{bash.1,bashref.texi}
- - document new treatment of negative indices to indexed arrays when
- assigning, referencing, calculating length, and unsetting
-
- 8/29
- ----
-shell.c
- - show_shell_usage: add -l to list of shell invocation options (short
- for --login). From Red Hat bug 852469
-
-configure.ac
- - renamed from configure.in, as latest autoconf versions want. Patches
- Stefano Lattarini <stefano.lattarini@gmail.com>
-
-MANIFEST,Makefile.in,doc/bashref.texi,support/mkconffiles
- - configure.in -> configure.ac
-
- 9/1
- ---
-
-parse.y
- - read_token_word: allow words like {array[ind]} to be valid redirection
- words for constructs like {x}<file
-
-redir.c
- - redir_varassign: bind_var_to_int already handles array assignments,
- so don't need to do anything more for things like {a[i]}<file
- - redir_varvalue: changes to allow references to {a[i]} when
- performing redirections using valid_array_reference and
- get_array_value. Adds functionality requested most recently by
- <unknown@vmw-les.eng.vmware.com>
-
-lib/readline/display.c
- - update_line: if the first difference between the old and new lines
- is completely before any invisible characters in the prompt, we
- should not adjust _rl_last_c_pos, since it's before any invisible
- characters. Fixed in two places
- - prompt_modechar: return a character indicating the editing mode:
- emacs (@), vi command (:), or vi insert (+)
- - _rl_reset_prompt: new function, just calls rl_expand_prompt. Will be
- inlined, placeholder for more changes
- - expand_prompt: if show-mode-in-prompt is enabled, add a character to
- the front of the prompt indicating the editing mode, adjusting the
- various variables as appropriate to keep track of the number of
- visible characters and number of screen positions
-
-lib/readline/bind.c
- - show-mode-in-prompt: new bindable boolean variable, shadowed by
- _rl_show_mode_in_prompt variable
- - hack_special_boolean_var: call _rl_reset_prompt when toggling or
- setting show-mode-in-prompt
-
-lib/readline/readline.c
- - readline_internal_setup: make sure the correct vi mode keymap is set
- before expanding the prompt string for the first time
-
-lib/readline/misc.c
- - rl_emacs_editing_mode: make sure to call _rl_reset_prompt if we're
- showing the editing mode in the prompt
-
-lib/readline/rlprivate.h
- - _rl_reset_prompt, _rl_show_mode_in_prompt: extern declarations
-
-lib/readline/vi_mode.c
- - rl_vi_insertion_mode: call _rl_reset_prompt
- - rl_vi_movement_mode: call _rl_reset_prompt. Finishes changes for
- showing mode in prompt string, originally requested by Miroslav
- Koskar <mkoskar@gmail.com> and most recently by Jordan Michael
- Ziegler <jziegler@bnl.gov>
-
-doc/bash.1,lib/readline/doc/{readline.3,rluser.texi}
- - document new show-mode-in-prompt variable, off by default
-
- 9/3
- ---
-
-jobs.c
- - set_childmax: new function, external mechanism for other parts of
- the shell to set js.c_childmax, the number of saved exited child
- statuses to remember
-jobs.h
- - set_childmax: extern declaration
-
-variables.c
- - CHILD_MAX: new special variable, with sv_childmax function to
- run when it changes. Setting CHILD_MAX to a value greater than
- zero but less than some maximum (currently 8192) sets the number of
- exited child statuses to remember. set_childmax (jobs.c) ensures
- that the number does not drop below the posix-mandated minimum
- (CHILD_MAX)
-
-doc/{bash.1,bashref.texi}
- - CHILD_MAX: document new meaning and action when variable is set
-
- 9/5
- ---
-redir.c
- - redir_varassign: call stupidly_hack_special_variables after
- assigning fd number to specified variable, so we can use constructs
- like {BASH_XTRACEFD}>foo. Suggested by Pierre Gaston
- <pierre.gaston@gmail.com>
-
- 9/8
- ---
-expr.c
- - readtok: invalidate previous contents of `curlval' before freeing
- and reallocating tokstr (which, chances are, will get the same
- pointer as before and render curlval inconsistent). Fixes other
- bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 9/9
- ---
-lib/readline/complete.c
- - rl_username_completion_function: protect call to setpwent() with
- #ifdef (HAVE_GETPWENT)/#endif. Fixes bug reported by
- Gerd Hofmann <gerd.hofmann.nbg@googlemail.com>
-
-lib/readline/display.c
- - rl_message: second and subsequent calls to rl_message can result in
- local_prompt being overwritten with new values (e.g., from the
- successive calls displaying the incremental search string). Need
- to free before overwriting if it's not the same as the value saved
- in saved_local_prompt. Fixes memory leak reported by
- Wouter Vermaelen <vermaelen.wouter@gmail.com>
-
-lib/readline/{terminal.c,rlprivate.h}
- - move CUSTOM_REDISPLAY_FUNC and CUSTOM_INPUT_FUNC defines from
- terminal.c to rlprivate.h so other files can use them
-
-expr.c
- - expr_streval: if noeval is non-zero, just return 0 right away,
- short-circuiting evaluation completely. readtok will leave curtok
- set correctly without re-entering the evaluator at all. Rest of
- fix for bug reported by Dan Douglas <ormaaj@gmail.com>
-
- 9/11
- ----
-
-parse.y
- - parse_comsub: make sure the `reserved word ok in this context' flag
- is preserved after we read `do' followed by whitespace. Fixes bug
- reported by Benoit Vaugon <benoit.vaugon@gmail.com>
-
- 9/13
- ----
-configure.ac,config.h.in
- - enable-direxpand-default: new configure option, turns the `direxpand'
- shell option on by default
-
-bashline.c
- - dircomplete_expand, dircomplete_expand_relpath: initialize to 1 if
- DIRCOMPLETE_EXPAND_DEFAULT is defined and non-zero
-
-doc/bashref.texi
- - enable-direxpand-default: document new configure option
-
- 9/14
- ----
-shell.c
- - --protected: make option valid only when wordexp is compiled into
- the shell. Fix from Roman Rakus <rrakus@redhat.com>
-
-configure.ac
- - HP NonStop (*-nsk*): compile --without-bash-malloc. Change from
- Joachim Schmitz <jojo@schmitz-digital.de>
-
- 9/16
- ----
-subst.c,execute_cmd.c,lib/glob/sm_loop.c,lib/sh/shquote.c
- - minor code cleanups from Joachim Schmitz <jojo@schmitz-digital.de>
-
-lib/readline/colors.h
- - workaround for HP NonStop compiler issue with <stdbool.h> from
- Joachim Schmitz <jojo@schmitz-digital.de>
-
- 9/17
- ----
-builtins/printf.def
- - printf_builtin: handle localtime returning NULL, as can happen when
- encountering overflow. Bug report and initial fix from
- Eduardo A. Bustamante López <dualbus@gmail.com>
-
-doc/{bash.1,bashref.texi}
- - emphasize that brace expansion using character ranges ({a..c}) acts
- as if the C locale were in use. Prompted by message from
- Marcel Giannelia <info@skeena.net>
-
- 9/20
- ----
-lib/sh/wcsnwidth.c
- - wcsnwidth: new function, variant of wcwidth, returns the number of
- wide characters from a string that will be displayed to not exceed
- a specified max column position
-
- 9/21
- ----
-builtins/help.def
- - show_builtin_command_help: break code that displays the short-doc
- for each builtin in two columns into a new function: dispcolumn
- - wdispcolumn: multibyte-char version of dispcolumn; uses wide
- chars and printf "%ls" format. Fixes problem reported by
- Nguyá»n Thái Ngá»c Duy <pclouds@gmail.com>
-
- 9/22
- ----
-execute_cmd.c
- - execute_disk_command: before running the command-not-found hook,
- call kill_current_pipeline() to make sure we don't add processes
- to an existing pipeline or wait for processes erroneously
-
- 9/23
- ----
-lib/readline/input.c
- - rl_input_available_hook: new hook function, called from
- _rl_input_available (or _rl_input_queued) to return whether or not
- input is available wherever the input source is
-
-lib/readline/doc/rltech.texi
- - rl_input_available_hook: document
-
- 9/27
- ----
-lib/glob/sm_loop.c:
- - GMATCH: after one or more `*', an instance of ?(x) can match zero or
- 1 times (unlike ?, which has to match one character). The old code
- failed if it didn't match at least once. Fixes `a*?(x)' bug.
- - GMATCH: if we hit the end of the search string, but not the end of
- the pattern, and the rest of the pattern is something that can
- match the NUL at the end of the search string, we should successfully
- match. Fixes `a*!(x)' bug reported by <hans1worst@gmail.com>
-
- 10/2
- ----
-command.h
- - add c_lock member to coproc structure for future use to tell who is
- manipulating it
-
-execute_cmd.c
- - execute_coproc: block SIGCHLD while parent is forking coproc
- process and adding pid to sh_coproc struct to avoid race condition
- where child is reaped before the pid is assigned and the coproc is
- never marked as having died. Fixes race condition identified by
- Davide Baldini <baldiniebaldini@gmail.com>
- - add assignments to c_lock member of struct coproc in various
- functions that manipulate it; was used to identify race condition
- - coproc_pidchk: don't call coproc_dispose to avoid using malloc and
- other functions in a signal handler context
- - coproc_dispose: call BLOCK_SIGNAL/UNBLOCK_SIGNAL for SIGCHLD while
- manipulating the sh_coproc struct
-
- 10/6
- ----
-lib/readline/complete.c
- - rl_display_match_list: if printing completions horizontally, don't
- bother with spacing calculations if limit == 1, which means we are
- printing one completion per line no matter what. Fixes bug
- reported by David Kaasen <kaasen@nvg.ntnu.no>
-
- 10/7
- ----
-builtins/declare.def
- - declare_internal: add error checking for nameref attribute and
- variable assignments: self-references, attempts to make an array
- variable a nameref
-
-subst.c
- - parameter_brace_expand: handle parameter_brace_expand_word returning
- &expand_param_fatal or &expand_param_error and return the appropriate
- error value
- - parameter_brace_expand_word: if a nameref variable's value is not a
- valid identifier, return an error
- - param_expand: if a nameref variable's value is not a valid identifier,
- return an error
-
-test.c
- - unary_operator: add new -R variable, returns true if variable is set
- and has the nameref attribute. From ksh93
-
-builtins/test.def
- - add -R to description of conditional commands for help test
-
-doc/{bash.1,bashref.texi}
- - document new -R unary conditional operator
-
- 10/13
- -----
-trap.c
- - check_signals_and_traps: new function, convenience function for the
- rest of the shell to check for pending terminating and interrupt
- signals, and to check for and process any pending traps
- - any_signals_trapped: new function, returns non-zero if any signals
- are trapped and -1 if not
-
-trap.h
- - extern declaration for check_signals_and_traps
-
-bashline.c
- - bashline_reset: make sure we reset the event hook
- - bash_event_hook: call check_signals_and_traps instead of just
- checking for terminating signals so we can run pending traps and
- react to interrupts, and reset the event hook when we're done
-
-
- 10/14
- -----
-trap.c
- - trap_handler: if executing in a readline signal handler context,
- call bashline_set_event_hook to install bash_event_hook to process
- the signal (if bash cares about it)
-
-sig.c
- - sigint_sighandler: call bashline_set_event_hook to set the event
- hook if we're executing in a readline signal handler context
-
-lib/readline/input.c
- - rl_getc: call RL_CHECK_SIGNALS if read returns -1/EINTR and the caught
- signal is SIGINT or SIGQUIT rather than waiting until the next time
- around the loop
- - rl_getc: call rl_event_hook after calling RL_CHECK_SIGNALS to allow
- an application signal handler to set the event hook in its own
- signal handler (e.g., like bash trap_handler or sigint_sighandler)
-
-
-parse.y
- - yy_readline_get: don't set interrupt_immediately before we call
- readline(). Inspired by report from lanshun zhou
- <zls.sogou@gmail.com>
-
-input.c
- - getc_with_restart: add call to run_pending_traps after call to
- CHECK_TERMSIG
-
-lib/sh/zread.c
- - zread: call check_signals_and_traps if read() returns -1/EINTR
- instead of just ignoring the EINTR and deferring handling any
- signal that generated it
-
-builtins/mapfile.def
- - mapfile: don't set interrupt_immediately before calling zgetline()
- (which uses zread internally)
-
-builtins/read.def
- - read_builtin: don't set interrupt_immediately before calling zread
- (moved code around so that it was only being set right around calls
- to zread to avoid signal handler conflicts). Inspired by report
- from lanshun zhou <zls.sogou@gmail.com>
- - edit_line: don't set interrupt_immediately around call to readline()
- - include shmbutil.h
- - read_builtin: don't call read_mbchar unless is_basic(c) returns
- false for the character we just read
-
- 10/15
- -----
-sig.c
- - throw_to_top_level: if interrupt_state is non-zero, make sure that
- last_command_exit_value reflects 128+SIGINT if it's not already
- greater than 128
-
- 10/20
- -----
-builtins/wait.def
- - WAIT_RETURN: set wait_signal_received back to 0 for the potential
- next call to wait
-
-quit.h
- - CHECK_WAIT_INTR: macro to check whether trap_handler handled a
- signal and set wait_signal_received; longjmp to wait_intr_buf in
- that case
-
-jobs.c
- - wait_for, waitchld: call CHECK_WAIT_INTR at the same places we call
- CHECK_TERMSIG to check for terminating signals
- - wait_sigint_handler: don't longjmp out of the wait builtin unless
- interrupt_immediately is set; otherwise just SIGRETURN from the
- handler
- - wait_sigint_handler: if interrupt_immediately not set, but we are
- executing in the wait builtin and SIGINT is not trapped, treat it
- as a `normally received' SIGINT: restore the signal handler and
- send SIGINT to ourselves
- - waitchld: when in posix mode and running SIGCHLD traps, don't longjmp
- to wait_intr_buf (and let wait be interrupted) if we're running from
- a signal handler. Wait for CHECK_WAIT_INTR to do the longjmp.
- run_pending_traps will run the SIGCHLD trap later
-
-nojobs.c
- - reap_zombie_children, wait_for_single_pid, wait_for: call
- CHECK_WAIT_INTR where we call CHECK_TERMSIG
- - wait_sigint_handler: don't longjmp out of the wait builtin unless
- interrupt_immediately is set; otherwise just SIGRETURN from the
- handler
-
-trap.c
- - trap_handler: make sure wait_signal_received is set if the wait
- builtin is executing, and only longjmp if interrupt_immediately is
- set. This whole set of fixes was prompted by report from
- lanshun zhou <zls.sogou@gmail.com>
-
- 10/24
- -----
-lib/glob/glob.c
- - glob_filename: only check directory_name for globbing chars if
- it's of non-zero length
-
-lib/sh/strchrnul.c
- - new simpler implementation
-
-subst.c
- - command_substitute: call set_shellopts after turning off errexit
- in subshells so it's reflected in $SHELLOPTS
-
- 11/7
- ----
-builtins/evalstring.c
- - parse_and_execute: treat ERREXIT case like reader_loop does: set
- variable_context to 0 before longjmping back to top_level. Don't
- run the unwind-protect context to avoid side effects from popping
- function contexts. Part of fix for problem reported by Nikolai
- Kondrashov <nikolai.kondrashov@redhat.com>
-
-execute_cmd.c
- - execute_simple_command: call unlink_fifo_list only if this is the
- last element of a pipeline (or not in a pipeline), rather than for
- every child. Fixes difference in behavior between /dev/fd and
- FIFOs reported by Zev Weiss <zev@bewilderbeest.net>
- - execute_null_command: do the same thing in the parent branch after
- make_child
-
- 11/14
- -----
-subst.c
- - parameter_brace_expand: a variable is null if it's special ($@, $*),
- the expansion occurs within double quotes, and the expansion turns
- into a quoted null. Fixes debian bug 692447 reported by
- Matrosov Dmitriy <sgf.dma@gmail.com>
-
-jobs.c
- - run_sigchld_trap: make sure `running_trap' sentinel is set
- appropriately
- - waitchld: only run the sigchld trap if we're not in a signal
- handler, not running a trap, and executing the wait builtin.
- Otherwise, queue for later handling. We still run one instance
- of the trap handler per exited child. Bulk of fix for bug
- reported by Elliott Forney <idfah@cs.colostate.edu>
-
-trap.c
- - queue_sigchld_trap: set catch_flag so run_pending_traps notices,
- and set trapped_signal_received for completeness. Rest of fix
- for bug reported by Elliott Forney <idfah@cs.colostate.edu>
-
-lib/malloc/malloc.c
- - block_signals: renamed to _malloc_block_signals, made public
- - unblock_signals: renamed to _malloc_unblock_signals, made public
-
-lib/malloc/imalloc.h
- - extern declarations for _malloc_{un,}block_signals
-
-lib/malloc/table.c
- - mregister_alloc, mregister_free: block signals around table
- manipulation
-
- 11/15
- -----
-trap.c
- - run_pending_traps: set SIG_INPROGRESS flag around calls to
- run_sigchld_handler so other parts of the shell know that the
- SIGCHLD trap handler is executing
- - run_pending_traps: if we get a situation where we are looking at
- running a SIGCHLD trap but the trap string is IMPOSSIBLE_TRAP_HANDLER
- and the SIG_INPROGRESS flag is set, just skip it. This is possible
- if run_pending_traps is called from a SIGCHLD trap handler run by
- run_sigchld_trap
-
-doc/bash.1,lib/readline/doc/{rluser.texi,readline.3}
- - corrected description of the effect of `set history-size 0'. Report
- from Vesa-Matti J Kari <vmkari@cc.helsinki.fi>
-
-include/stdc.h
- - CPP_STRING: new define, replaces __STRING
-
-lib/malloc/{malloc.c,imalloc.h}
- - replace __STRING with CPP_STRING
-
- 11/16
- -----
-lib/readline/bind.c
- - sv_histsize: if argument evaluates to a value < 0, unstifle the
- history
-
- 11/22
- -----
-redir.c
- - do_redirection_internal: if we have REDIR_VARASSIGN set in the
- redirection flags and we set up `redirector' using fcntl or dup2,
- don't add a redirect to make sure it stays open. Let the
- script programmer manage the file handle. Fixes bug reported by
- Sam Liddicott <sam@liddicott.com>
-
- 11/24
- -----
-jobs.c
- - wait_for_any_job: new function, waits for an unspecified background
- job to exit and returns its exit status. Returns -1 on no background
- jobs or no children or other errors. Calls wait_for with new
- sentinel value ANY_PID
- - wait_for: changes to handle argument of ANY_PID: don't look up or
- try to modify the child struct, only go through the wait loop once.
- Return -1 if waitpid returns no children
-
-jobs.h
- - ANY_PID: new define
-
-builtins/wait.def
- - new option: -n. Means to wait for the next job and return its exit
- status. Returns 127 if there are no background jobs (or no
- children). Feature most recently requested by Elliott Forney
- <idfah@cs.colostate.edu>
-
-doc/{bash.1,bashref.texi}
- - document new `wait -n' option
-
-execute_cmd.c
- - execute_command_internal: save make_command_string () result in a
- temp variable before calling savestring() on it; avoids evaluating
- make_command_string() result twice. Fix from John E. Malmberg
- <wb8tyw@qsl.net>
-
- 11/28
- -----
-
-builtins/declare.def
- - declare_internal: if an array variable is declared using `declare -a'
- or `declare -A', but not assigned a value, set the `invisible'
- attribute so the variable does not show up as set. Fix for bug
- about variable initialization reported by Tim Friske <me@timfriske.com>
-
-builtins/{mapfile,read}.def
- - after calling find_or_make_array_variable, make sure the invisible
- flag is turned off, in case the variable was declared previously
- using `declare -a' or `declare -A'. Side effect of above change to
- declare_internal
-
-subst.c
- - shell_expand_word_list: handle the W_ASSNGLOBAL flag and put -g into
- the list of options passed to make_internal_declare as appropriate.
- Fix for bug reported by Tim Friske <me@timfriske.com>
-
- 11/30
- -----
-test.c
- - unary_op: make sure -v and -n check that the variable is not marked
- as invisible before calling var_isset. Fix for bug reported by Tim
- Friske <me@timfriske.com>
-
- 12/2
- ----
-subst.c
- - process_substitute: turn off the `expanding_redir' flag, which
- controls whether or not variables.c:find_variable_internal uses the
- temporary environment to find variables. We want to use the
- temp environment, since we don't have to worry about order of
- evaluation in a subshell. Fixes bug reported by Andrey Borzenkov
- <arvidjaar@gmail.com>
-
- 12/4
- ----
-lib/glob/glob.c
- - glob_filename: changes to avoid null filenames and multiple entries
- returned for patterns like **/** (globstar enabled). Fixes bug
- reported by Ulf Magnusson <ulfalizer@gmail.com>
-
- 12/10
- -----
-lib/glob/glob.c
- - glob_filename: finish up a series of changes to make globstar-style
- globbing more efficient, avoid more duplicate filenames, and be more
- compatible with other shells that implement it
- o collapse a sequence of **/**/** to one **
- o note when the directory name is all ** or ends in ** so we
- can treat it specially when the filename is **
- All inspired by report from Andrey Borzenkov <arvidjaar@gmail.com>
-
-lib/sh/zread.c
- - zreadn: new function, like zread, but takes an additional argument
- saying how many bytes to read into the local buffer. Can be used to
- implement `read -N' without so many one-byte calls to zreadc. Code
- from Mike Frysinger <vapier@gentoo.org>
-
- 12/12
- -----
-lib/glob/sm_loop.c
- - PATSCAN (glob_patscan): if passed string already points to end of
- pattern, return NULL immediately. Fixes problem with
- extglob_skipname reported by Raphaël Droz <raphael.droz@gmail.com>
-
- 12/13
- -----
-execute_cmd.c
- - execute_coproc: handle the command's exit status being inverted
- (an oversight). Fixes bug reported by DJ Mills
- <danielmills1@gmail.com> and Andreas Schwab <schwab@linux-m68k.org>
-
- 12/14
- -----
-lib/readline/readline.c
- - bind_arrow_keys_internal: add MINGW key bindings for Home, End,
- Delete, and Insert keys. Fix from Pierre Muller
- <pierre.muller@ics-cnrs.unistra.fr>
-
-builtins/printf.def
- - printf_builtin: '%()T' conversion: if there is no argument supplied,
- behave as if -1 had been supplied (current time). ksh93-like feature
- suggested by Clark Wang <dearvoid@gmail.com>
-
-doc/{bash.1,bashref.texi}
- - document new printf %()T default argument behavior
-
- 12/15
- -----
-lib/readline/display.c
- - displaying_prompt_first_line: new variable, indicates whether or
- not the first line of output is displaying the prompt. Always true
- in normal mode, sometimes false in horizontal scrolling mode
- - rl_redisplay: set displaying_prompt_first_line to true unless we
- are in horizontal mode; set to false in horizontal mode if the left
- margin of the displayed line is greater than the end of the prompt
- string
- - rl_redisplay: when in horizontal scroll mode, don't adjust
- _rl_last_c_pos by the wrap offset unless the line is displaying
- a prompt containing invisible chars
- - update line: don't adjust _rl_last_c_pos by the wrap offset unless
- the line is displaying a prompt containing invisible chars
- - update_line: if shrinking the line by reducing the number of
- displayed characters, but we have already moved the cursor to the
- beginning of the line where the first difference starts, don't
- try to delete characters
-
-builtins/read.def
- - unbuffered_read: set to 2 if invoked as `read -N'
- - if unbuffered_read is set to 2, compute the number of chars we
- need to read and read that many with zreadn. Posix mode still
- uses zreadintr. Code from Mike Frysinger <vapier@gentoo.org>
-
-doc/{bash.1,bashref.texi}
- - read: make it clear that if read times out, it saves any input
- read to that point into the variable arguments. Report from
- Fiedler Roman <Roman.Fiedler@ait.ac.at>
-
-subst.c
- - command_substitute: change direct assignment of exit_immediately_on_error
- to use change_flag ('e', FLAG_OFF) instead
-
-flags.c
- - use errexit_flag as the variable modified by changes to the -e
- option, reflect those changes to exit_immediately_on_error
-
-execute_cmd.c
- - execute_builtin: new global variable, builtin_ignoring_errexit, set
- to 0 by default and set to 1 if eval/source/command executing in a
- context where -e should be ignored
- - execute_builtin: set exit_immediately_on_error to errextit_flag
- after executing eval/source/command in a context where -e should
- be ignored
-
-flags.c
- - if builtin_ignoring_errexit is set, changes to errexit_flag are
- not reflected in the setting of exit_immediately_on_error. Fixes
- bug reported by Robert Schiele <rschiele@gmail.com>
-
- 12/23
- -----
-include/posixjmp.h
- - setjmp_nosigs: new define, call setjmp in such a way that it will
- not manipulate the signal mask
-
-{expr,test,trap}.c
- - setjmp_nosigs: call instead of setjmp; don't need to manipulate
- signal mask
-
-builtins/read.def
- - read_builtin: setjmp_nosigs: call instead of setjmp; don't need
- to manipulate signal mask
-
-builtins/evalstring.c:
- - parse_and_execute: setjmp_nosigs: call instead of setjmp; don't need
- to manipulate signal mask
- - parse_string: setjmp_nosigs: call instead of setjmp; don't need
- to manipulate signal mask
- - parse_and_execute: save and restore the signal mask if we get a
- longjmp that doesn't cause us to return or exit (case DISCARD)
-
- 12/24
- -----
-general.c
- - bash_tilde_expand: only set interrupt_immediately if there are no
- signals trapped; we want to jump to top level if interrupted but
- not run any trap commands
-
- 12/25
- -----
-jobs.c
- - run_sigchld_trap: no longer set interrupt_immediately before calling
- parse_and_execute, even if this is no longer run in a signal handler
- context
-
-input.c
- - getc_with_restart: add call to QUIT instead of CHECK_TERMSIG
-
-parse.y
- - yy_stream_get: now that getc_with_restart calls QUIT, don't need to
- set interrupt_immediately (already had call to run_pending_traps)
-
-execute_cmd.c
- - execute_subshell_builtin_or_function,execute_function,execute_in_subshell:
- setjmp_nosigs: call instead of setjmp when saving return_catch; don't
- need to manipulate signal mask
- - execute_subshell_builtin_or_function,execute_in_subshell:
- setjmp_nosigs: call instead of setjmp where appropriate when saving
- top_level; don't need to manipulate signal mask if we're going to
- exit right away
-
-subst.c
- - command_substitute: setjmp_nosigs: call instead of setjmp when saving
- return_catch; don't need to manipulate signal mask
- - command_substitute: setjmp_nosigs: call instead of setjmp where
- appropriate when saving top_level; don't need to manipulate signal
- mask if we're going to exit right away
-
-trap.c
- - run_exit_trap: setjmp_nosigs: call instead of setjmp when saving
- return_catch; don't need to manipulate signal mask
- - run_exit_trap: setjmp_nosigs: call instead of setjmp where
- appropriate when saving top_level; don't need to manipulate signal
- mask if we're going to exit right away
- - _run_trap_internal: setjmp_nosigs: call instead of setjmp when saving
- return_catch; don't need to manipulate signal mask
-
-builtins/evalfile.c
- - _evalfile: setjmp_nosigs: call instead of setjmp when saving
- return_catch; don't need to manipulate signal mask
-
-builtins/evalstring.c
- - evalstring: setjmp_nosigs: call instead of setjmp when saving
- return_catch; don't need to manipulate signal mask
-
-shell.c
- - main: setjmp_nosigs: call instead of setjmp where appropriate when
- saving top_level; don't need to manipulate signal mask if we're
- going to exit right away
- - run_one_command: setjmp_nosigs: call instead of setjmp where
- appropriate when saving top_level; don't need to manipulate signal
- mask if we're going to exit right away
- - run_wordexp: setjmp_nosigs: call instead of setjmp where
- appropriate when saving top_level; don't need to manipulate signal
- mask if we're going to exit right away
-
-eval.c
- - reader_loop: save and restore the signal mask if we get a longjmp
- that doesn't cause us to return or exit (case DISCARD)
-
- 12/26
- -----
-parse.y
- - shell_input_line_{index,size,len}: now of type size_t; in some cases
- the unsigned property makes a difference
- - STRING_SAVER: saved_line_{size,index} now of type size_t
- - shell_getc: don't allow shell_input_line to grow larger than SIZE_MAX;
- lines longer than that are truncated until read sees a newline;
- addresses theoretical buffer overflow described by Paul Eggert
- <eggert@cs.ucla.edu>
- - set_line_mbstate: size_t changes like shell_getc
- - shell_getc: if shell_input_line is larger than 32K, free it and
- start over to avoid large memory allocations sticking around
-
-variables.c
- - bind_global_variable: new function, binds value to a variable in
- the global shell_variables table
-
-variables.h
- - bind_global_variable: new extern declaration
-
-builtins/declare.def
- - declare_internal: if -g given with name=value, but variable is not
- found in the global variable table, make sure to call
- bind_global_variable so the variable is created and modified at
- global scope. Fixes a bug where declare -g x=y could modify `x'
- at a previous function scope
-
-command.h
- - W_ASSIGNARRAY: new word flag, compound indexed array assignment
-
-subst.h
- - ASS_MKGLOBAL: new assignment flag, forcing global assignment even in
- a function context, used by declare -g
-
-execute_cmd.c
- - fix_assignment_words: set W_ASSIGNARRAY flag if -a option given to
- declaration builtin
-
-subst.c
- - do_assignment_internal: explicitly handle case where we are
- executing in a function and we want to create a global array or
- assoc variable
- - shell_expand_word_list: call make_internal_declare if -a option
- given to declaration builtin (W_ASSIGNARRAY); handle -g option with
- it (W_ASSNGLOBAL). Fixes inconsistency noticed by Vicente Couce
- Diaz <vituko@gmail.com>, where declare -ag foo=(bar) could modify
- array variable foo at previous function scope, not global scope
-
- 12/27
- -----
-bashline.c
- - Minix needs the third argument to tputs to be a void funtion taking
- an int argument, not an int-returning function. Fix from
- John E. Malmberg <wb8tyw@qsl.net> as part of VMS bash port
-
- 12/29
- -----
-configure.ac,version.c,patchlevel.h
- - bash-4.3-devel: new version, new shell compatibility level (43)
-
-subst.c
- - parameter_brace_patsub: put the bash-4.2 code back in from the
- change of 3/3 that runs the replacement string through quote
- removal, make it dependent on shell_compatibility_level <= 42
-
-builtins/shopt.def
- - compat42: new shopt option
- - set_compatibility_level: change logic to set and unset various
- compat variables and shell_compatibility_level
-
-COMPAT
- - new documentation for bash-4.3 compatibility changes
-
-doc/{bash.1,bashref.texi}
- - compat42: document new shopt option
-
-builtins/shopt.def
- - set_compatibility_opts: new function, sets the various shopt
- compat variables based on the value of shell_compatibility_level
-
-builtins/common.h
- - set_compatibility_opts: new extern declaration
-
-variables.c
- - BASH_COMPAT: new special variable; sets the shell compatibility
- level. Accepts values in decimal (4.2) or integer (42) form;
- Unsetting variable, setting it to empty string, or setting it to
- out-of-range value sets the shell's compatibility level to the
- default for the current version. Valid values are 3.1/31 through
- the current version
- - sv_shcompat: new function implementing logic for BASH_COMPAT
-
-variables.h
- - sv_shcompat: new extern declaration
-
-doc/{bash.1,bashref.texi}
- - BASH_COMPAT: description of new variable
-
-lib/readline/complete.c
- - _rl_colored_stats: default back to 0 for 4.3 release branch
-
- 1/5/2013
- --------
-quit.h
- - remove spurious call to itrace in CHECK_WAIT_INTR
-
-bashline.c
- - bash_event_hook: if we're going to jump to top_level, make sure we
- clean up after readline() by calling rl_cleanup_after_signal().
- Fixes bug reported against devel branch by Raphaël Droz
- <raphael.droz@gmail.com>
- - bash_event_hook: reset the event hook before checking for signals
- or traps in case we longjmp
-
-doc/{bash.1,bashref.texi}
- - small additions to the set -e section to make it more clear that
- contexts where -e is ignored extend to compound commands as well
- as shell functions
-
-lib/readline/readline.h
- - rl_signal_event_hook: new extern declaration
-
-lib/readline/input.c
- - rl_signal_event_hook: new variable, hook function to call when a
- function (currently just read(2)) is interrupted by a signal and
- not restarted
- - rl_getc: call rl_signal_event_hook instead of rl_event_hook
-
-lib/readline/doc/rltech.texi
- - rl_signal_event_hook: document new function
-
-bashline.c
- - changes to set rl_signal_event_hook instead of rl_event_hook
-
-lib/readline/readline.h
- - change readline version numbers to 6.3
-
- 1/6
- ---
-doc/{bash.1,bashref.texi}
- - a couple of changes to the descriptions of the ERR trap and its
- effects based on a message from Rob Nagler <nagler@bivio.biz>
-
- 1/9
- ---
-expr.c
- - expassign: invalidate curlval before freeing and NULLing tokstr to
- avoid aliasing issues. Fixes bug reported by Eduardo A. Bustamante
- López<dualbus@gmail.com> and Dan Douglas <ormaaj@gmail.com>
-
-braces.c
- - array_concat: don't be so aggressive in trying to short-circuit. We
- can only short-circuit if we have a single-element array where the
- element is an empty string (array[0] == "" array[1] = 0x0). Existing
- practice requires us to replicate arrays and prefix or append empty
- strings. Fixes bug reported by Eduardo A. Bustamante López
- <dualbus@gmail.com>
-
- 1/11
- ----
-execute_cmd.c
- - execute_builtin: since mapfile uses evalstring() to run its callbacks
- internally, just like eval, so it needs to handle the case where the
- temp environment given to mapfile persists throughout the entire
- set of callback commands. This might be a problem with trap also, but
- trap isn't run in the same way. Fixes bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
- 1/13
- ----
-redir.c
- - redirection_error: before expanding the redirection word (if
- expandable_redirection_filename returns true), disable command
- substitution during expansion. Fixes bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
-subst.c
- - expand_word_internal: case '\\': if the next character is an IFS
- character, and the expansion occurs within double quotes, and the
- character is not one for which backslash retains its meaning, add
- the (escaped) '\' and the (escaped) character. Fixes bug reported
- by Dan Douglas <ormaaj@gmail.com>
-
- 1/15
- ----
-builtins/cd.def
- - cd_builtin: make sure call to internal_getopt handles -e option.
- Fixes bug reported by <mashimiao.fnst@cn.fujitsu.com>
-
- 1/17
- ----
-subst.c
- - expand_word_list_internal: make sure tempenv_assign_error is
- initialized to 0
-
-execute_cmd.c
- - execute_simple_command: make sure tempenv_assign_error is reset to 0
- after it's tested to see if an error should force the shell to exit.
- Fixes problem where a the failure of a tempenv assignment preceding
- a non-special builtin `sticks' and causes the next special builtin
- to exit the shell. From a discussion on bug-bash started by
- douxin <wq-doux@cn.fujitsu.com>
-
- 1/20
- ----
-subst.c
- - parameter_brace_expand_rhs: call stupidly_hack_special_variables
- after assigning with ${param[:]=word} even if IFS is changing.
- Suggested by Dan Douglas <ormaaj@gmail.com> [TENTATIVE, needs work
- on IFS side effects]
-
-command.h
- - W_GLOBEXP (which was unused) is now W_SPLITSPACE (which isn't used
- yet)
-
-{execute_cmd,subst,variables}.c
- - removed all code that mentioned W_GLOBEXP
- - removed mention of gnu_argv_flags and code that set it
-
- 1/22
- ----
-subst.c
- - param_expand: set W_SPLITSPACE if we expand (unquoted) $* and
- IFS is unset or null so we can be sure to split this on spaces
- no matter what happens with IFS later
- - expand_word_internal: note that param_expand returns W_SPLITSPACE
- in the returned word flags and keep track of that state with
- `split_on_spaces'
-
- 1/23
- ----
-subst.c
- - expand_word_internal: if split_on_spaces is non-zero, make sure
- we split `istring' on spaces and return the resultant word. The
- previous expansions should have quoted spaces in the positional
- parameters where necessary. Suggested by Dan Douglas
- <ormaaj@gmail.com>
-
-execute_cmd.c
- - execute_command_internal: make sure any subshell forked to run a
- group command or user subshell at the end of a pipeline runs any
- EXIT trap it sets. Fixes debian bash bug 698411
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=698411
-
-subst.c
- - shell_expand_word_list: fix code that creates args for and calls
- make_internal_declare to avoid calling it twice (missing `else'
- in 12/26 change)
- - do_assignment_internal: fix code from 12/26 change to fix problem
- where an existing assoc variable could be converted to an array
- without checking `mkassoc'
-
- 1/24
- ----
-builtins/evalfile.c
- - _evalfile: add missing `close (fd)' calls before returning to
- avoid fd leaks. Bug and fix from Roman Rakus <rrakus@redhat.com>
-
- 1/25
- ----
-builtins/read.def
- - read_builtin: don't try to play tricks with the top of the unwind-
- protect stack after read gets a SIGALRM; save input_string to new
- memory, run the stack, then restore input_string and assign the
- variables. Part of fix for bug reported by konsolebox
- <konsolebox@gmail.com>; the rest of the fix is with the changes in
- trap and signal handling and doing away with interrupt_immediately
-
- 1/26
- ----
-redir.c
- - redirection_expand, write_here_string, write_here_document: before
- calling any of the word expansion functions, after setting
- expanding_redir to 1 (which bypasses the temp environment in the
- variable lookup functions), call sv_ifs to reset the cached IFS-
- related variables set by subst.c:setifs(). This ensures that
- redirections will not get any IFS values that are set in the
- temporary environment, as Posix specifies. Then, after the word
- expansions, after resetting expanding_redir to 0, call sv_ifs
- again to make sure the cached IFS values are set from any
- assignments in the temporary environment. We force executing_builtin
- to 1 to `fool' the variable lookup functions into using any temp
- environment, then reset it to its old value after sv_ifs returns.
- This is what allows read() to use the (cached) IFS variables set
- in the temp environment. Fixes inconsistency reported by Dan Douglas
- <ormaaj@gmail.com>
-
- 1/29
- ----
-lib/readline/display.c
- - update_line: fix off-by-one error when updating vis_lbreaks array
- in a multibyte locale that occurs when moving multibyte chars from
- one line down to another. Bug report and fix from Egmont
- Koblinger <egmont@gmail.com>
-
- 1/30
- ----
-configure.ac
- - changed version to 4.3-alpha
-
-redir.c
- - redir_open: handle open returning -1/EINTR, which seems to happen
- a lot with FIFOs and SIGCHLD, and call QUIT to handle other
- signals that can interrupt open(2). Bug report and initial fix
- from Mike Frysinger <vapier@gentoo.org>
-
- 1/31
- ----
-subst.c
- - parameter_brace_expand: make sure to propagate the PF_ASSIGNRHS flag
- to parameter_brace_expand_word
- - parameter_brace_expand_word: make sure that if the PF_ASSIGNRHS flag
- is set and we are expanding ${a[@]} or ${a[*]} we set quoted to
- include Q_DOUBLE_QUOTES before calling array_value_internal, mirroring
- what we do for $@ and $*. Fixes inconsistency reported by Dan
- Douglas <ormaaj@gmail.com>
-
-configure.ac
- - use AC_CHECK_TOOL instead of AC_CHECK_PROG to check for ar, since it
- will find $host-prefixed versions of utilities. Report and fix from
- Mike Frysinger <vapier@gentoo.org>
-
-builtins/setattr.def
- - set_var_attribute: check whether bind_variable (called when the
- variable whose attributes are being modified is found in the temp
- environment) just modified a read-only global variable, and don't
- bother marking the temporary variable for propagation if so. The
- propagation is superfluous and will result in a strange error
- message
-
- 2/2
- ---
-variables.c
- - initialize_shell_variables: don't try to import function definitions
- with invalid names from the environment if already in posix mode,
- but create them as (invisible) exported variables so they pass
- through the environment. Print an error message so user knows
- what's wrong. Fixes bug reported by Tomas Trnka <ttrnka@mail.muni.cz>
-
- 2/9
- ---
-
-builtins/read.def
- - sigalrm_seen, alrmbuf: now global so the rest of the shell (trap.c)
- can use them
- - sigalrm: just sets flag, no longer longjmps to alrmbuf; problem was
- longjmp without manipulating signal mask, leaving SIGALRM blocked
-
-quit.h
- - move CHECK_ALRM macro here from builtins/read.def so trap.c:
- check_signals() can call it
-
-trap.c
- - check_signals: add call to CHECK_ALRM before QUIT
- - check_signals_and_traps: call check_signals() instead of including
- CHECK_ALRM and QUIT inline. Integrating check for read builtin's
- SIGALRM (where zread call to check_signals_and_traps can see it)
- fixes problem reported by Mike Frysinger <vapier@gentoo.org>
-
- 2/12
- ----
-lib/glob/xmbsrtowcs.c
- - xdupmbstowcs2: fixed but where end of string was not handled
- correctly, causing loop to go past end of string in a bunch of cases.
- Fixes bug reported by "Dashing" <dashing@hushmail.com>
-
-
- 2/13
- ----
-builtins/pushd.def
- - popd_builtin: treat any argument that isn't -n or of the form
- [-+][[:digit:]]* as an error. Fixes problem reported by Bruce
- Korb <bruce.korb@gmail.com>
-
- 2/14
- ----
-configure.ac
- - add check for sig_atomic_t; already a placeholder for it in
- config.h.in
-
- 2/15
- ----
-subst.c
- - do_compound_assignment: don't call assign_compound_array_list with
- a NULL variable in case make_local_xxx_variable returns NULL
- (it will if you try to shadow a readonly or noassign variable).
- Fixes bug reported by Richard Tollerton <rich.tollerton@ni.com>
-
- 2/16
- ----
-variables.c
- - make_local_variable: print error messager if an attempt is made to
- create a local variable shadowing a `noassign' variable. Previously
- we just silently refused to do it
-
-trap.[ch]
- - get_original_signal: now global so rest of the shell can use it
-
-sig.c
- - initialize_shell_signals: install a signal handler for SIGTERM
- that does nothing except set a sigterm_received flag instead of
- ignoring it with SIG_IGN, as long as SIGTERM is not ignored when
- the shell is started. Use get_original_signal early to get the
- original handler, since we will do that later anyway
- - set_signal_handler: if installing sigterm_sighandler as the SIGTERM
- handler, make sure to add SA_RESTART flag to make it as close to
- SIG_IGN as possible
-
-sig.h
- - sigterm_sighandler: new extern declaration
-
-quit.h
- - RESET_SIGTERM: set sigterm_receved to 0
- - CHECK_SIGTERM: check sigterm_received; if it's non-zero, treat it
- as a fatal signal and call termsig_handler to exit the shell
-
-jobs.c
- - make_child: call RESET_SIGTERM just before fork() so we can detect
- if the child process received a SIGTERM before it's able to change
- the signal handler back to what it was when the shell started
- (presumably SIG_DFL). Only has effect if the shell installed
- sigterm_sighandler for SIGTERM, interactive shells that were not
- started with SIG_IGN as the SIGTERM handler
- - make_child: call RESET_SIGTERM in the parent after fork() so the
- rest of the shell won't react to it
-
-execute_cmd.c
- - execute_simple_command: call CHECK_SIGTERM after make_child in child
- to catch SIGTERM received after fork() and before restoring old
- signal handlers
- - execute_disk_command: call CHECK_SIGTERM after make_child in child
- process after restoring old signal handlers and again just before
- calling shell_execve. Fixes race condition observed by
- Padraig Brady <p@draigbrady.com> when testing with his `timeout'
- program
-
-lib/readline/display.c
- - open_some_spaces: new function, subset of insert_some_chars that just
- opens up a specified number of spaces to be overwritten
- - insert_some_spaces: now just calls to open_some_spaces followed by
- _rl_output_some_chars
- - update_line: use col_temp instead of recalculating it using
- _rl_col_width in the case where we use more columns with fewer bytes
- - update_line: use open_some_spaces and then output the right number
- of chars instead of trying to print new characters then overwrite
- existing characters in two separate calls. This includes removing
- some dodgy code and making things simpler. Fix from Egmont
- Koblinger <egmont@gmail.com>
- - use new variable `bytes_to_insert' instead of overloading temp in
- some code blocks (nls - nfd, bytes that comprise the characters
- different in the new line from the old)
-
- 2/18
- ----
-redir.c
- - do_redirection_internal: add undoable redirection for the implicit
- close performed by the <&n- and >&n- redirections. Fixes bug
- reported by Stephane Chazelas <stephane.chazelas@gmail.com>
-
- 2/19
- ----
-sig.c
- - termsig_handler: an interactive shell killed by SIGHUP and keeping
- command history will try to save the shell history before exiting.
- This is an attempt to preserve the save-history-when-the-terminal-
- window-is-closed behavior
-
- 2/21
- ----
-braces.c
- - brace_expand: if a sequence expansion fails (e.g. because the
- integers overflow), treat that expansion as a simple string, including
- the braces, and try to process any remainder of the string. The
- remainder may include brace expansions. Derived from SuSE bug
- 804551 example (https://bugzilla.novell.com/show_bug.cgi?id=804551)
-
- 2/23
- ----
-{quit,sig}.h,sig.c
- - sigterm_received declaration now in sig.h; type is sig_atomic_t
- - sigwinch_received type now sig_atomic_t
- - sig.h includes bashtypes.h and <signal.h> if SIG_DFL not defined
- (same logic as trap.h) to pick up sig_atomic_t
-
-unwind_prot.c
- - include sig.h before quit.h (reverse order)
-
- 2/27
- ----
-builtins/shopt.def
- - reset_shopt_options: make sure check_window_size is reset to the
- default from config.h, not unconditionally to 0
-
-jobs.[ch]
- - last_made_pid, last_asynchronous_pid: now volatile. Change from SuSE
-
-jobs.c
- - wait_for: if we're using sigaction to install a handler for SIGCHLD,
- make sure we specify SA_RESTART
-
-lib/{tilde,readline}/shell.c
- - get_home_dir: instead of looking in the password file every time,
- look once and cache the result
-
-sig.[ch]
- - sigwinch_received, sigterm_received: now `volatile' qualified
-
-sig.c,quit.h
- - interrupt_state,terminating_signal: now sig_atomic_t
-
- 3/1
- ---
-MANIFEST,examples/*
- - removed around 120 files without FSF copyrights; requested by
- Karl Berry in early January
-
- 3/2
- ---
-lib/malloc/malloc.c
- - morecore: only check whether SIGCHLD is trapped if SIGCHLD is defined
-
-doc/bashref.texi
- - Fixed most of the examples in the GNU Parallel section to use better
- shell idioms following complaints on bug-bash; added a couple of
- examples and smoothed out the text
-
-quit.h
- - include "sig.h" for sig_atomic_t
-
-lib/readline/display.c
- - update_line: when inserting one or more characters at the end of
- the display line in a non-multibyte environment, just write from the
- first difference to the end of the line and return. We don't have
- to adjust _rl_last_c_pos. This is needed to adjust from the old
- two-part copy to a single call to _rl_output_some_chars (change of
- 2/16)
-
- 3/4
- ---
-Makefile.in,doc/Makefile.in
- - PACKAGE_TARNAME, docdir: new variables substituted by autoconf
- - OTHER_DOCS,OTHER_INSTALLED_DOCS: new variables with auxiliary
- documentation files to be installed into $(docdir)
- - install: add new rule to install $(OTHER_DOCS)
- - uninstall: add new rule to uninstall $(docdir)/$(OTHER_INSTALLED_DOCS)
-
-doc/bash.1
- - add URL to `POSIX' file in `SEE ALSO' section; put pointer to that
- section in --posix and set -o posix descriptions
-
-examples/
- - removed around 110 examples at the request of the FSF due to copyright
- issues
-
- 3/5
- ---
-builtins/setattr.def
- - readonly: modified help text slightly to make it clearer that
- functions aren't changed or displayed unless the -f option is given.
- Report from <gotmynick@gmail.com>
-
- 3/9
- ---
-include/typemax.h
- - SIZE_MAX: define to 65535 (Posix minimum maximum) if not defined
-
-parse.y
- - include "typemax.h" for possible SIZE_MAX definition, make sure we
- include it after shell.h
-
-{braces,expr}.c
- - include "typemax.h" for possible INTMAX_MIN and INTMAX_MAX definitions
-
- 3/10
- ----
-bashline.c
- - bash_default_completion: make sure completion type of `!' (same as
- TAB but with show-all-if-ambiguous set) and glob-word-completion
- sets rl_filename_completion_desired to 0 so extra backslashes don't
- get inserted by `quoting' the completion. We can't kill all the
- matches because show-all-if-ambiguous needs them. Bug report from
- Marcel (Felix) Giannelia <info@skeena.net>
-
-[bash-4.3-alpha frozen]
-
- 3/14
- ----
-general.c
- - trim_pathname: use memmove instead of memcpy since the source and
- destination pathnames may overlap. Report and fix from Matthew
- Riley <mattdr@google.com>
-
- 3/18
- ----
-configure.ac
- - socklen_t is defined as `unsigned int' if configure can't find it
-
- 3/20
- ----
-lib/readline/complete.c
- - S_ISVTX: since it's not defined on all platforms (Minix), make sure
- its use is protected with #ifdef
-
- 3/21
- ----
-doc/{bash.1,bashref.texi}
- - Added mention of ${!name[@]} and ${!name[*]} expansions to get all
- indices of an array. Suggested by Jonathan Leffler
- <jonathan.leffler@gmail.com>
-
- 3/24
- ----
-subst.h
- - SD_IGNOREQUOTE: new define for skip_to_delim; if set, means that
- single quotes (for now) will be treated as ordinary characters
-
-subst.c
- - skip_to_delim: handle SD_IGNOREQUOTE. no callers use it for now
-
- 3/25
- ----
-support/config.{guess,sub}
- - updated to versions from autoconf-2.69
-
- 3/31
- ----
-lib/sh/shquote.c
- - sh_single_quote: short-circuit quoting a single "'" instead of
- creating a long string with empty single-quoted strings
-
-parser.h
- - DOLBRACE_QUOTE2: new define, like DOLBRACE_QUOTE, but need to single-
- quote results of $'...' expansion because quote removal will be
- done later. Right now this is only done for ${word/pat/rep}
-
-parse.y
- - parse_matched_pair: set state to DOLBRACE_QUOTE2 for pattern
- substitution word expansion so we don't treat single quote specially
- in the pattern or replacement string
- - parse_matched_pair: if we're parsing a dollar-brace word expansion
- (${...}) and we're not treating single quote specially within
- double quotes, single-quote the translation of $'...' ansi-c
- escaped strings. Original report and fix from Eduardo A.
- Bustamante López <dualbus@gmail.com>
-
-subst.c
- - extract_dollar_brace_string: ${word/pat/rep} scanning now sets the
- DOLBRACE_QUOTE2 flag instead of DOLBRACE_QUOTE so we don't treat
- single quotes specially within a double-quoted string
-
-execute_cmd.c
- - fix_assignment_words: skip over assignment statements preceding a
- command word before trying to figure out whether or not assignment
- statements following a possible declaration command should be
- treated specially. Fixes bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
- 4/4
- ---
-lib/readline/readline.c
- - _rl_dispatch_subseq: only call _rl_vi_set_last (and check whether
- the key is a text modification command) if the key sequence length
- is 1. That keeps the arrow keys from setting the last command
- when called in vi command mode. Fixes bug reported by Ian A.
- Watson <watson_ian_a@lilly.com>
-
- 4/6
- ---
-lib/readline/bind.c
- - rl_parse_and_bind: when parsing a double-quoted string as the value
- of a variable, make sure we skip past the leading double quote.
- Fix from Andreas Schwab <schwab@linux-m68k.org>
-
-variables.c
- - hash_lookup: set new local variable last_table_searched to the table
- a successful lookup appears in; tested in make_local_variable to
- solve the problem below
- - make_local_variable: if we find a variable with the tempenv flag
- set at the same `level' as variable_context', but not found in the
- temporary_env (temp environment preceding the builtin), return it.
- The temp environment preceding the function call has already been
- merged (in execute_function) into the list of variable contexts the
- function sees as shell_variables by the time this is called. Fixes
- inconsistency pointed out by Dan Douglas <ormaaj@gmail.com>
-
-subst.c
- - expand_arith_string: expanded out contents of expand_string,
- expand_string_internal, expand_string_if_necessary to create a
- WORD_DESC and call call_expand_word_internal() on it directly.
- We don't want process substitution to be performed ( 1<(2) ) should
- mean something different in an arithmetic expression context.
- It doesn't work to just turn on the DQUOTE flag, since that means
- that things like ${x["expression"]} are not expanded correctly.
- Fixes problem pointed out by Dan Douglas <ormaaj@gmail.com>
-
- 4/13
- ----
-subst.c
- - process_substitute: run the EXIT trap before exiting, as other
- shells seem to. Fixes problem pointed out by Dan Douglas
- <ormaaj@gmail.com>
-
-lib/readline/readline.c
- - readline_internal_setup: call rl_vi_insertion_mode to enter vi
- mode instead of rl_vi_insert_mode to avoid resetting the saved last
- command information. Posix says that `.' can repeat a command
- that was entered on a previous line so we need to save the info.
- Fixes bug reported by Ian A. Watson <watson_ian_a@lilly.com>
-
- 4/14
- ----
-lib/readline/complete.c
- - rl_completion_matches: make sure xrealloc returns something non-null
- (can happen when interrupted by a signal) before trying to add
- matches to match_list
-
-subst.c
- - array_remove_pattern: return NULL right away if array_variable_part
- returns an invisible variable
- - array_length_reference: handle array_variable_part returning an
- invisible variable
- - get_var_and_type: handle array_variable_part returning an invisible
- variable
-
- 4/15
- ----
-execute_cmd.c
- - execute_command_internal: make sure to run the EXIT trap for group
- commands anywhere in pipelines, not just at the end. From a point
- raised by Andreas Schwab <schwab@linux-m68k.org>
-
-variables.c
- - bind_int_variable: make sure invisible flag is unset. Fixes problems
- like "declare -ai a; : $(( a[4]=4 ));"
-
-arrayfunc.c
- - array_variable_part: return variable even if invisible flag set,
- callers must handle invisible vars
-
- 4/18
- ----
-builtins/set.def
- - unset_builtin: if -n flag given, call unset_nameref instead of
- unset_variable
-
-variables.c
- - find_variable_nameref: print warning message if nameref circular
- reference detected, return NULL and let caller deal with it
-
-builtins/declare.def
- - declare_builtin: only disallow global references at this point if
- we are at the global scope
-
- 5/16
- ----
-configure.ac
- - update release status to beta
-
- 5/23
- ----
-trap.c
- - run_pending_traps: save and restore pipeline around calls to
- evalstring() in case we get a trap while running a trap. Have to
- figure out the recursive running traps issue elsewhere. Fixes
- bug reported by Roman Rakus <rrakus@redhat.com>
- - run_pending_traps: make sure to set running_trap to the appropriate
- signal value when running a trap command
- - run_pending_traps: short-circuit immediately if running_trap set
- when invoked. Could change this later to only skip if it would
- run the same trap as currently being run (running_trap == sig + 1)
-
-configure.ac
- - add warning if bison not found
-
-lib/readline/doc/rltech.texi
- - new section with an example program illustrating the callback
- interface. Suggested by Peng Yu <pengyu.ut@gmail.com>
-
-examples/loadables/Makefile.in
- - remove references to `cut' and `getconf', which were removed in
- early March
-
- 5/28
- ----
-lib/sh/pathphys.c
- - sh_realpath: correct inverted two arguments to call to sh_makepath.
- Report and fix from Julien Thomas <jthomas@exosec.fr>
-
- 6/7
- ---
-execute_cmd.c
- - executing_line_number: the else clauses that are conditional on
- various options being defined can simply be if clauses -- they are
- mutually exclusive and all have `return' in the body. Fixes bug
- reported by Flavio Medeiros <flaviomotamedeiros@gmail.com>
-
- 6/25
- ----
-lib/readline/readline.c
- - readline_internal_setup: only sent the meta-key enable string to the
- terminal if we've been told to use one and the terminal has been
- successfully initialized (RL_ISSTATE (RL_STATE_TERMPREPPED) != 0).
- Suggested by Dan Mick <dan.mick@inktank.com>
-
-lib/readline/signals.c
- - _rl_signal_handler: call any defined signal hook after calling
- rl_resize_terminal when handling a SIGWINCH. We already have called
- the original SIGWINCH handler but will not be resending the signal
- to ourselves
-
- 6/27
- ----
-lib/readline/doc/history.3, doc/bash.1
- - fix description of the `$' modifier to note that it expands to the
- last *word*, which is not always the last argument. Report from
- ariyetz@gmail.com via gnu.org RT
-
- 6/29
- ----
-lib/glob/smatch.c
- - glob_asciiranges: initialize to value of GLOBASCII_DEFAULT instead
- of 0 (0 if not defined)
-
-configure.ac,config.h.in
- - --enable-glob-asciiranges-default: new option, controls the value of
- GLOBASCII_DEFAULT; use it to turn globasciiranges shopt option on
- by default
-
-doc/bashref.texi
- - document new --enable-glob-asciiranges-default configure option
-
-variables.c
- - assign_in_env: implement += value appending semantics for assignments
- preceding command names
-
- 7/4
- ---
-expr.c
- - set lasttok = NUM in all of the functions that result in a number,
- even if it's a boolean, to avoid errors with constructs like
- 1 * x = 1, which should be an asignment error. Fixes problem
- pointed out by Dan Douglas <ormaaj@gmail.com>
-
-parse.y
- - decode_prompt_string: don't bother to call strcpy if
- polite_directory_format returns its argument unchanged. It's not
- necessary and Mac OS X 10.9 aborts because of a supposed overlapping
- string copy. Bug and fix from simon@hitzemann.org
-
-subst.c
- - parameter_brace_find_indir: new function, code from
- parameter_brace_expand_indir that looks up the indirectly-referenced
- variable, but does not expand it
- - parameter_brace_expand_indir: call parameter_brace_find_indir to
- look up indirected variable reference
- - get_var_and_type: call parameter_brace_find_indir if it looks like we
- are trying to manipulate an indirect variable reference like
- ${!b%%foo}. This makes a difference if !b references an array
- variable. Bug report from Dan Douglas <ormaaj@gmail.com>
-
- 7/6
- ---
-lib/sh/casemod.c
- - sh_modcase: make sure argument passed to is_basic is <= UCHAR_MAX,
- since cval can convert something to a wchar_t greater than UCHAR_MAX.
- Fixes bug reported by Tomasz Tomasik <scx.mail@gmail.com>
-
- 7/8
- ---
-lib/readline/history.c
- - add_history_time: if history_length == 0, referencing history_length
- - 1 will result in an array bounds error, so make history_length be
- at least 1 before going on. Fixes bug reported by Geng Sheng Liu
- <gsliu.tju@gmail.com>
-
-builtins/setattr.def
- - show_func_attributes: display definition (if NODEFS argument is 0) and
- attributes for a particular function; used by `declare -fp name'
-
-builtins/declare.def
- - declare_internal: call show_func_attributes if -f supplied with -p.
- Fixes inconsistency observed by Linda Walsh <bash@tlinx.org>
-
-builtins/common.h
- - new extern declaration for show_func_attributes
-
-builtins/read.def
- - read_builtin: check the first supplied variable name for validity
- before attempting to read any input, since we know we will have to
- at least use that one. Don't check any other names yet. Suggested
- by jidanni@jidanni.org
-
- 7/10
- ----
-redir.c
- - do_redirection_internal: when closing a file descriptor with
- r_close_this ([n]<&-) count close errors as redirection errors if
- errno ends up as EIO or ENOSPC. Originally reported back in April
- 2012 by Andrey Zaitsev <jstcdr@gmail.com>
-
- 7/11
- ----
-redir.c
- - do_redirection_internal: before calling check_bash_input, make sure
- that we don't call check_bash_input for an asynchronous process that
- is replacing stdin with something else. The seek backwards affects
- the parent process as well, since parents and children share the
- file pointer. Fixes problem originally reported in March 2013 by
- Martin Jackson <mjackson220.list@gmail.com>
-
- 7/13
- ----
-doc/{bash.1,bashref.texi}
- - slight change to add a description of `shopt -o' suggested by Bruce
- Korb <bruce.korb@gmail.com>
-
- 7/19
- ----
-lib/readline/histfile.c
- - history_do_write: if close returns < 0, make sure we restore the
- backup history file and return a non-zero value
- - history_truncate_file: if write or close return < 0, make sure we
- return a non-zero value
-
-[bash-4.3-beta frozen]
-
- 7/21
- ----
-lib/readline/isearch.c
- - rl_display_search: now takes an entire search context flags word as
- the second argument, instead of just reverse flag; changed callers
- - rl_display_search: if the search has failed, add `failed ' to the
- beginning of the search prompt
- - _rl_isearch_dispatch: if the search has failed, display the entire
- search string with an indication that the search failed but with the
- last matching line. Suggested by jidanni@jidanni.org
-
-command.h
- - W_ASSIGNINT: new word flag; used internally for make_internal_declare
- and set by fix_assignment_words
-
-execute_cmd.c
- - fix_assignment_words: set W_ASSIGNINT if compound assignment and -i
- given as option. We don't do anything with the value yet
-
-subst.c
- - shell_expand_word_list: rework the way the option list that is
- passed to make_internal_declare is created
-
- 8/1
- ---
-doc/{bash.1,bashref.texi}
- - minor changes to description of $! based on a report from Chris
- Down <chris@chrisdown.name>
-
-arrayfunc.c
- - assign_array_element_internal: before trying to get an array's max
- index to process a negative subscript, make sure the array exists.
- Bug report from Geir Hauge <geir.hauge@gmail.com>
-
- 8/2
- ---
-arrayfunc.c
- - assign_array_element_internal: before using array_max_index() when
- processing a negative subscript, make sure the variable is an array.
- if it's not, use 0 as array_max_index assuming it's a string.
- Fixes bug report from Geir Hauge <geir.hauge@gmail.com>
-
- 8/3
- ---
-Makefile.in
- - pcomplete.o: add dependency on $(DEFDIR)/builtext.h. Suggested by
- Curtis Doty <curtis@greenkey.net>
-
- 8/5
- ---
-lib/glob/sm_loop.c
- - strcompare: short-circuit and return FNM_NOMATCH if the lengths of the
- pattern and string (pe - p and se - s, respectively) are not equal
- - strcompare: don't bother trying to set *pe or *se to '\0' if that's
- what they already are. Fixes bug reported by Geir Hauge
- <geir.hauge@gmail.com>
-
- 8/6
- ---
-doc/{bash.1,bashref.texi},builtins/hash.def,lib/readline/doc/rluser.texi
- - minor typo changes from Geir Hauge <geir.hauge@gmail.com>
-
-bultins/help.def
- - show_longdoc: avoid trying to translate the empty string because it
- often translates to some boilerplate about the project and
- translation. Report and fix from Geir Hauge <geir.hauge@gmail.com>
-
- 8/8
- ---
-builtins/help.def
- - help_builtin: try two passes through the list of help topics for each
- argument: one doing exact string matching and one, if the first pass
- fails to find a match, doing string prefix matching like previous
- versions. This prevents `help read' from matching both `read' and
- `readonly', but allows `help r' to match everything beginning with
- `r'. Inspired by report from Geir Hauge <geir.hauge@gmail.com>
-
- 8/13
- ----
-builtins/fc.def
- - fc_builtin,fc_gethnum: calculate `real' end of the history list and
- use it if -0 is specified as the beginning or end of the history
- range to list. Doesn't work for fc -e or fc -s by design. Feature
- requested by Mike Fied <micfied@gmail.com>
-
- 8/16
- ----
-trap.c
- - _run_trap_internal: use {save,restore}_parser_state instead of
- {save,restore}_token_state. It's more comprehensive
-
- 8/23
- ----
-doc/bash.1
- - disown: remove repeated text. Report and fix from Thomas Hood
- <jdthood@gmail.com>
-
- 8/25
- ----
-lib/readline/rltty.c
- - set_special_char: fix prototype (last arg is rl_command_func_t *)
-
-sig.c
- - set_signal_handler: return oact.sa_handler only if sigaction
- succeeds; if it doesn't, return SIG_DFL (reasonable default). From
- https://bugzilla.redhat.com/show_bug.cgi?id=911404
-
-bashline.c
- - attempt_shell_completion: fix to skip assignment statements preceding
- command name even if there are no programmable completions defined.
- From https://bugzilla.redhat.com/show_bug.cgi?id=994659
- - attempt_shell_completion: if still completing command word following
- assignment statements, do command completion even if programmable
- completion defined for partial command name entered so far
-
- 8/26
- ----
-pcomplete.c
- - pcomp_filename_completion_function: make sure rl_filename_dequoting_function
- is non-NULL before trying to call it. Bug and fix from
- Andreas Schwab <schwab@linux-m68k.org>
-
-bashline.c
- - bash_command_name_stat_hook: if *name is not something we're going
- to look up in $PATH (absolute_program(*name) != 0), just call the
- usual bash_filename_stat_hook and return those results. This makes
- completions like $PWD/exam[TAB] add a trailing slash
-
- 9/2
- ---
-builtins/read.def
- - read_builtin: before comparing what we read to the delim, make sure
- we are not supposed to be ignoring the delimiter (read -N). We
- set the delim to -1, but it's possible to read a character whose
- int value ends up being between -1 and -128. Fixes bug
- reported by Stephane Chazelas <stephane.chazelas@gmail.com>
-
-doc/{bash.1,bashref.texi}
- - word splitting: crib some language from Posix to make it clear that
- characters in IFS are treated as field *terminators*, not field
- *separators*. Addresses issue raised by DJ Mills
- <danielmills1@gmail.com>
-
-lib/readline/{util.c,rldefs.h}
- - _rl_stricmp,_rl_strnicmp: now take const char * string arguments;
- changed prototype declarations
-
- 9/5
- ---
-doc/{bash.1,bashref.texi}
- - [[: modify description of pattern matching to make it clear that the
- match is performed as if the extglob option were enabled. From Red
- Hat bug https://bugzilla.redhat.com/show_bug.cgi?id=1002078
-
- 9/12
- ----
-lib/readline/isearch.c
- - _rl_isearch_dispatch: if we read an ESC and it's supposed to
- terminate the search, make sure we check for typeahead with
- _rl_pushed_input_available, since installing a hook function causes
- typeahead to be collected in `ibuffer' (input.c). If there is any,
- make sure we still use the ESC as a prefix character. Bug and fix
- from Mike Miller <mtmiller@ieee.org>
-
- 9/16
- ----
-builtins/{caller,cd,kill,pushd,wait}.def
- - builtin_usage(): make sure call to this sets return status to
- EX_USAGE
-
- 9/18
- ----
-terminal.c
- - rl_change_environment: new application-settable variable; if non-
- zero (the default), readline will modify LINES and COLUMNS in the
- environment when it handles SIGWINCH
- - _rl_get_screen_size: if rl_change_environment is non-zero, use setenv
- to modify LINES and COLUMNS environment variables
-
-readline.h
- - rl_change_environment: new extern declaration for applications
-
- 9/22
- ----
-configure.ac
- - relstatus: bumped version to bash-4.3-beta2
-
- 9/24
- ----
-
-lib/readline/readline.c
- - bind_arrow_keys_internal: added more key bindings for the numeric key
- pad arrow keys on mingw32. Patch from Pierre Muller
- <pierre.muller@ics-cnrs.unistra.fr>
-
- 10/19
- -----
-
-bashline.c
- - maybe_restore_tilde: version of restore_tilde that honors `direxpand';
- calls restore_tilde after saving directory expansion hook if
- necessary. Report from Andreas Schwab <schwab@linux-m68k.org>
-
-builtins/cd.def
- - -@: new option, allows cd to use `extended attributes' present in
- NFSv4, ZFS; idea taken from ksh93. Attributes associated with a
- file are presented as a directory containing the attributes as
- individual files. Original patch contributed by Cedric Blancher
- <cedric.blancher@gmail.com>
-
- 10/20
- -----
-aclocal.m4
- - BASH_CHECK_MULTIBYTE: check for wcwidth being broken with unicode
- combining characters needs a value to use when cross-compiling.
- Bug report from Bert Sutherland <bertsutherland@gmail.com>
-
-doc/{bash.1,bashref.texi}
- - document new -@ option to cd builtin
-
- 10/28
- -----
-lib/glob/{{gmisc,glob}.c,glob.h}
- - extglob_pattern renamed to extglob_pattern_p, declared in glob.h
-
-subst.c
- - expand_word_internal: typo fix: case to fix " $@\ " bug in bash-4.2
- had a typo (& isexp instead of &&)
-
- 10/29
- -----
-input.c
- - getc_with_restart: make sure local_index and local_bufused are
- reset to 0 before returning EOF, in case we are running an interactive
- shell without line editing and ignoreeof is set. Report and fix
- from Yong Zhang <yong.zhang@windriver.com>
-
-lib/readline/search.c
- - _rl_nsearch_init: take out extra third argument to rl_message; it
- only matches prototype (and maybe format) in cases where
- PREFER_STDARG and USE_VARARGS are both undefined, which is rare
-
- 10/31
- -----
-subst.c
- - process_substitute: when opening the named pipe in the child, open
- without O_NONBLOCK to avoid race conditions. Happens often on AIX.
- Bug report and fix from Michael Haubenwallner
- <michael.haubenwallner@salomon.at>
-
-builtins/ulimit.def
- - RLIMIT_NTHR: if RLIMIT_PTHREAD is not defined, but RLIMIT_NTHR is,
- use RLIMIT_NTHR (NetBSD)
-
- 11/5
- ----
-locale.c
- - set_default_locale_vars,set_locale_var: if TEXTDOMAINDIR has been
- set, and default_dir has a non-null value, call bindtextdomain(3)
- when TEXTDOMAIN is assigned a value. Fixes problem reported by
- Michael Arlt <qwertologe@googlemail.com>
-
- 11/6
- ----
-builtins/cd.def
- - cdxattr: only create synthetic pathname in `buf' if NDIRP argument
- is non-null
- - change_to_directory: if we have specified -@ and cdxattr returns
- failure, fail immediately. Fixes bug reported by Joshuah Hurst
- <joshhurst@gmail.com>
-
- 11/12
- -----
-redir.c
- - print_redirection: change r_err_and_out (&>) and its append form,
- r_append_err_and_out (&>>) cases to separate redirection operator
- from filename by a space, in case we have a process substitution.
- Fixes bug reported by admn ombres <admn.ombres@gmail.com>
-
- 11/15
- -----
-execute_cmd.c
- - execute_simple_command: don't close process substitution fds until
- we are finished executing any current shell function. Partial fix
- for bug reported by John Dawson <john.dawson@gmail.com>
-
-support/shobj-conf
- - add support for Darwin 13 (Mac OS X 10.9, Mavericks). Based on a
- report by Ludwig Schwardt <ludwig.schwardt@gmail.com>
-
- 11/20
- -----
-[bash-4.3-rc1 frozen]
-
- 11/24
- -----
-builtins/printf.def
- - bind_printf_variable: make sure that the variable assigned to is
- no longer marked as invisible. Fixes bug reported by NBaH
- <nbah@sfr.fr>
-
- 11/28
- -----
-jobs.c
- - delete_old_job: fix off-by-one error in job index in call to
- internal_warning. Bug report from Peter Cordes <peter@cordes.ca>
-
- 11/30
- -----
-doc/bashref.texi
- - add string to description of special parameters with name of
- special parameter prefixed by a $, so you can search for $#,
- for instance
-
- 12/2
- ----
-lib/readline/{histexpand.c
- - get_history_event: account for current_history() possibly returning
- NULL. Report and fix from Pankaj Sharma <pankaj.s01@samsung.com>
-
-
- 12/11
- -----
-
-lib/readline/parse-colors.c
- - get_funky_string: don't call abort if we see something we can't
- parse; just return an error
- - _rl_parse_colors: if we encounter an error while parsing $LS_COLORS
- we need to leave _rl_color_ext_list as NULL after freeing its
- elements, then turn off _rl_colored_stats. Report and fix from Martin
- Wesdorp <mwesdorp@casema.nl>
-
- 12/13
- -----
-
-lib/readline/parse-colors.c
- - _rl_parse_colors: if we encounter an unrecognized prefix, throw an
- error but try to recover and go on to the next specification
-
-variables.c
- - make_local_variable: for new variables this function creates, set
- the att_invisible attribute. All callers from declare_internal.
- Indirectly, this is a fix for bug with `declare -n var; var=foo;'
- reported by Pierre Gaston <pierre.gaston@gmail.com>
- - bind_variable: if assigning to nameref variable that doesn't have
- a value yet (e.g., with `declare -n var; var=foo'), don't try to
- use the unset name. Fixes a segfault reported by Pierre Gaston
- <pierre.gaston@gmail.com>
-
-execute_cmd.c
- - execute_command_internal: make sure last_command_exit_value is set
- to 0 after any command executed in the background. Fixes bug
- reported by Martin Kealey <martin@kurahaupo.gen.nz>
-
- 12/17
- -----
-support/config.{guess,sub}
- - updated to latest versions from git
-
- 12/19
- -----
-parse.y
- - struct STRING_SAVER: now has a new `flags' element, to identify the
- caller: alias expansion, double-paren parsing, or parse_and_execute
- - push_string: now sets flags to PSH_ALIAS if `ap' argument is non-NULL
- - push_string: now doesn't attempt to call strlen on a NULL string to
- set shell_input_line_size
- - parser_expanding_alias, parser_save_alias, parser_restore_alias: new
- functions to provide an external interface to push_string and
- pop_string; parser_save_alias sets flags element to PSH_SOURCE (could
- be renamed PSH_EXTERN someday)
- - shell_getc: when yy_getc returns '\0', instead of just testing
- whether the pushed_string_list is not-empty before popping it, don't
- pop if if the saved string has flags PSH_SOURCE, indicating that
- parse_and_execute set it before setting bash_input to the string.
- We should continue reading to the end of that string before popping
- back to a potential alias. Partial solution for the problem of aliases
- with embedded newlines containing `.' commands being executed out of
- order reported by Andrew Martin <andrew.martin@gmail.com>
- - shell_getc: when yy_getc returns '\0' and there is a saved string of
- type PSH_SOURCE, restart the read without popping the string stack
- if we have not read to the end of bash_input.location.string. Rest
- of fix for out-of-order execution problem
-
-externs.h
- - parser_expanding_alias, parser_save_alias, parser_restore_alias: new
- extern function declarations
-
-builtins/evalstring.c
- - pe_prologue: if the parser is expanding an alias, make sure to add
- an unwind-protect to restore the alias; undoes the work that will be
- performed by parse_and_execute/parse_string
- - parse_and_execute,parse_string: after calling push_stream to save
- bash_input, check whether or not the parser is currently expanding
- an alias (parser_expanding_alias() != 0). If it is, we want to save
- that string in the pushed_string_list, which we do with
- parser_save_alias.
-
- 12/23
- -----
-execute_cmd.c
- - execute_for_command: make sure to set line_number before expanding
- the word list, so expansion errors have the right line number.
- From a report from Ben Okopnik <ben@okopnik.com>
-
-expr.c
- - exp2: save token pointer before calling readtok(), arrange to use
- saved token pointer when printing error token on a division by 0
- error
-
- 12/27
- -----
-lib/readline/display.c
- - rl_redisplay: when calculating effects of invisible characters in a
- prompt that is split across physical screen lines to set the indices
- of linebreaks, don't bother testing local_prompt_prefix (line 751).
- That prefix doesn't matter when calculating prompt visible and
- invisible characters. Fixes problem reported by Jinesh Choksi
- <jinesh@onelittlehope.com>
-
-Makefile.in
- - install: make sure to use $(DESTDIR) when installing OTHER_DOCS.
- Report and fix from Matthias Klose <doko@debian.org>
-
-doc/texinfo.tex
- - updated to version of 2013-09-11
-
- 12/28
- -----
-lib/readline/undo.c
- - rl_do_undo: if we are undoing from a history entry (rl_undo_list ==
- current_history()->data), make sure the change to rl_line_buffer is
- reflected in the history entry. We use the guts of
- rl_maybe_replace_line to do the work. Fixes problem reported by
- gregrwm <backuppc-users@whitleymott.net>
-
- 12/30
- -----
-sig.c
- - sigint_sighandler: if we get a SIGINT (and this signal handler is
- installed) while the wait builtin is running, note that we received
- it in the same way as jobs.c:wait_sigint_handler and return. The
- various wait_for functions will look for that with CHECK_WAIT_INTR.
- This fixes the wait builtin not being interruptible in an interactive
- job control shell
-
- 12/31
- -----
-trap.c
- - set_signal_hard_ignored: rename set_signal_ignored to this, since it
- both sets original_signals[sig] and sets the HARD_IGNORE flag
- - set_signal_ignored: new function, now just sets original_signals[sig]
-
-trap.h
- - set_signal_hard_ignored: new external declaration
-
-sig.c
- - initialize_terminating_signals: call set_signal_hard_ignored instead
- of set_signal_ignored for signals with disposition SIG_IGN when the
- shell starts
-
-execute_cmd.c
- - setup_async_signals: make sure we get the original dispositions for
- SIGINT and SIGQUIT before starting the subshell, and don't call
- set_signal_ignored because that sets original_signals[sig]. If we
- don't, subsequent attempts to reset handling using trap will fail
- because it thinks the original dispositions were SIG_IGN. Posix
- interpretation 751 (http://austingroupbugs.net/view.php?id=751)
-
- 1/2/2014
- --------
-lib/sh/stringvec.c
- - strvec_mcreate, strvec_mresize: versions of create and resize that
- use malloc and realloc, respectively, instead of xmalloc/xrealloc
-
-braces.c
- - expand_amble,mkseq: use strvec_mcreate/strvec_mresize so we can
- catch and handle memory allocation failures instead of aborting
- with the xmalloc/xrealloc interface
-
-lib/sh/strdup.c
- - strdup replacement function for ancient systems that don't have it
-
-lib/sh/itos.c
- - mitos: new function, itos that uses strdup instead of savestring
-
-externs.h
- - strvec_mcreate/strvec_mresize: new extern declarations
- - mitos: new extern declaration
-
-configure.ac
- - bash version moved to 4.3-rc2
-
- 1/6
- ---
-doc/bash.1,lib/readline/doc/{rluser.texi,readline.3}
- - separate the description of what happens when readline reads the
- tty EOF character from the description of delete-char, leaving a
- note in the delete-char description about common binding for ^D.
- From suggestion by Parke <parke.nexus@gmail.com>
-
-lib/readline/doc/{version.texi,history.3,*.texi}
- - updated email addresses and copyright dates
-
- 1/7
- ---
-variables.c
- - delete_var: new function, just removes a variable from a hash table
- and frees it, without doing anything else
- - make_variable_value: if we are trying to assign to a nameref variable,
- return NULL if the value is null or the empty string or not a valid
- identifier
-
-variables.h
- - delete_var: new extern declaration
-
-subst.h
- - ASS_NAMEREF: new define for assignments, means assigning to a nameref
- variable
-
-builtins/declare.def
- - declare_internal: if we are creating and assigning to a nameref
- variable, make sure the value is a valid variable name (checks done
- by make_variable_value via bind_variable_value) and display an
- error message, deleting the variable we just created, if it is not.
- Fixes bug reported by Peggy Russell <prusselltechgroup@gmail.com>
-
- 1/9
- ---
-builtins/declare.def
- - declare_internal: turning on nameref attribute for an existing
- variable turns off -i/-l/-u/-c attributes (essentially the ones
- that cause evaluation at assignment time) for ksh93 compat
-
-builtins/setattr.def
- - show_name_attributes: if asked to display attributes and values for
- a nameref variable, don't follow the nameref chain to the end. More
- ksh93 compat
-
- 1/10
- ----
-trap.c
- - _run_trap_internal: use {save,restore}_parser_state instead of
- {save,restore}_token_state, like in run_pending_traps(); don't
- need to save and restore last_command_exit_value as a result
- - _run_trap_internal: call {save,restore}_pipeline like in
- run_pending_traps()
- - run_pending_traps: since we no longer run traps in a signal handler
- context, do not block and unblock the trapped signal while the
- trap is executing
- - run_pending_traps: allow recursive invocations (basically, running
- traps from a trap handler) with only a warning if the shell is
- compiled in debug mode. If a caller doesn't want this to happen,
- it should test running_trap > 0. signal_in_progress (sig) only works
- for the signals the shell handles specially
-
-bashline.c
- - bash_event_hook: make sure we clean up readline if interrupt_state
- is set, not only when SIGINT is not trapped. check_signals_and_traps
- will call check_signals, which calls QUIT, which will longjmp back
- to top_level, running the interrupt trap along the way. Fixes the
- problem of signal handlers being reset out from under readline, and
- not being set properly the next time readline is called, because
- signals_set_flag is still set to 1. XXX - might need to do this
- for other signals too?
-
- 1/11
- ----
-subst.h
- - SD_GLOB: new define for skip_to_delim; means we are scanning a
- glob pattern.
-
-subst.c
- - skip_to_delim: if flags include SD_GLOB, assume we are scanning a
- glob pattern. Currently only used to skip bracket expressions
- which may contain one of the delimiters
-
- 1/12
- ----
-subst.c
- - parameter_brace_expand: when expanding $@ as part of substring
- expansion, pattern substitution, or case modification, don't turn
- on the QUOTED_NULL flag. The code that constructs the word to be
- returned from expand_word_internal expects a different code path
- when $@ is being expanded. Fixes bug reported by Theodoros
- V. Kalamatianos <thkala@gmail.com>
-
- 1/19
- ----
-subst.c
- - list_dequote_escapes: new function; analogue of list_quote_escapes
-
-pathexp.c
- - quote_string_for_globbing: fix case where unescaped ^A is last char
- in string; need to pass it through unaltered instead of turning it
- into a bare backslash
- - quote_string_for_globbing: when quoting for regexp matching in [[,
- don't treat backslash as a quote character; quote the backslash as
- any other character. Part of investigation into reports from
- Eduardo A. Bustamante López <dualbus@gmail.com>
-
- 1/25
- ----
-builtins/gen-helpfiles.c
- - write_helpfiles: add prototype
- - make sure to #undef xmalloc/xfree/xrealloc/free if USING_BASH_MALLOC
- is defined. the code does not use them, and we don't link against
- xmalloc.o. Report from Linda Walsh <bash@tlinx.org>
-
-Makefile.in
- - variables.o: add dependency on builtins/builtext.h; helps with
- parallel builds. Report from Linda Walsh <bash@tlinx.org>
-
-support/shobj-conf
- - darwin: combine the stanzas into one that will not require them to
- be updated on each Mac OS X release. Report and fix from Max Horn
- <max@quendi.de>
-
- 1/27
- ----
-support/shobj-conf
- - darwin: changed the install_name embedded into the shared library
- to contain only the major version number, not the minor one. The
- idea is that the minor versions should all be API/ABI compatible,
- and it is better to link automatically with the latest one. Idea
- from Max Horn <max@quendi.de>
-
- 1/29
- ----
-[bash-4.3-rc2 released]
-
- 1/30
- ----
-lib/readline/readline.h
- - rl_clear_history, rl_free_keymap: add extern declarations. Report
- from Hiroo Hayashi <hiroo.hayashi@computer.org>
-
-general.c
- - include trap.h for any_signals_trapped() prototype
-
-lib/sh/unicode.c
- - include <stdio.h> for sprintf prototype
-
- 1/31
- ----
-execute_cmd.c
- - execute_simple_command: only posix-mode shells should exit on an
- assignment failure in the temporary environment preceding a special
- builtin. This is what the documentation and code comments have
- always said
- - execute_simple_command: make sure redirection errors, word expansion
- errors, and assignment errors to Posix special builtins cause a
- non-interactive posix mode shell to exit. Previously the shell
- would not exit if the failed special builtin was on the LHS of ||
- or &&
-
-pathexp.c
- - quote_string_for_globbing: when quoting a regular expression
- (QGLOB_REGEXP), allow an unquoted backslash to pass through
- unaltered. Don't use it as a quote character or quote it. More
- investigation from 1/24 and report by Mike Frysinger
- <vapier@gentoo.org>
- - quote_string_for_globbing: when quoting a regular expression
- (QGLOB_REGEXP), turn CTLESC CTLESC into CTLESC without adding a
- backslash to quote it. We should not have to quote it because it is
- not a character special to EREs. More investigation from 1/24
-
-lib/glob/glob.c
- - glob_testdir: now takes a second flags argument (currently unused);
- changed prototype and callers
-
- 2/1
- ---
-lib/glob/glob.c
- - glob_testdir: if flags argument includes GX_ALLDIRS (globstar), use
- lstat so we skip symlinks when traversing the directory tree.
- Originally reported by Chris Down <chris@chrisdown.name>
-
- 2/2
- ---
-lib/readline/undo.c
- - rl_do_undo: make sure CUR is non-zero before dereferencing it to
- check cur->data against rl_undo_list. Report and fix from
- Andreas Schwab <schwab@linux-m68k.org>
-
-doc/{bash.1,bashref.texi}
- - added slight clarifying language to the description of $*,
- describing what happens when the expansion is not within double
- quotes
-
- 2/4
- ---
-test.c
- - unary_test: add code to -v case so that it interprets `bare' array
- references (foo[1]) and returns true if that index has a value
-
- 2/5
- ---
-trap.c
- - restore_default_signal: fix SIGCHLD special case for SIG_TRAPPED flag
- off but SIG_INPROGRESS mode set and handler IMPOSSIBLE_TRAP_HANDLER;
- continue with resetting handler in this case. maybe_set_sigchld_trap
- will check these things before resetting sigchld trap from
- run_sigchld_trap. Fixes (apparently long-standing?) problem reported
- by Alexandru Damian <alexandru.damian@intel.com>
-
- 2/6
- ---
-lib/sh/strtrans.c
- - ansic_quote: fixed a bug when copying a printable character that
- consumes more than one byte; byte counter was not being incremented.
- Bug report from jidanni@jidanni.org
-
- 2/7
- ---
-input.c
- - getc_with_restart: if read(2) returns -1/EINTR and interrupt_state or
- terminating_signal is set (which means QUIT; will longjmp out of this
- function), make sure the local buffer variables are zeroed out to
- avoid reading past the end of the buffer on the next call. Bug report
- from Dan Jacobson <jidanni@jidanni.org>
-
- 2/9
- ---
-bashline.c
- - command_word_completion_function: if a directory in $PATH contains
- quote characters, we need to quote them before passing the candidate
- path to rl_filename_completion_function, which performs dequoting on
- the pathname it's passed. Fixes bug reported by Ilyushkin Nikita
- <ilyushkeane@gmail.com>
-
- 2/11
- ----
-parse.y
- - xparse_dolparen: save and restore shell_eof_token around call to
- parse_string, intead of just leaving it set to ')'
- - shell_getc: when -v is set, only print the command line when
- shell_eof_token is 0, so we don't print it multiple times when
- recursively entering the parser to parse $(...) commands. Fixes
- bug reported by Greg Wooledge <wooledg@eeg.ccf.org>
-
-[changed release status to 4.3-release]
-
- 2/13
- ----
-lib/sh/strtrans.c
- - ansic_quote: handle case where mbrtowc reports that the multibyte
- sequence is incomplete or invalid. Fixes bug reported by
- Eduardo A. Bustamante López <dualbus@gmail.com>
-
- 2/14
- ----
-variables.c
- - find_variable_nameref_context: fix a problem that caused the loop
- to go one context too close to the global context. In some cases,
- simple variable assignment would set a variable in the global
- context instead of a local context. Bug report from
- Geir Hauge <geir.hauge@gmail.com>
-
- 2/26
- ----
-[bash-4.3 released]
-
- 2/27
- ----
-aclocal.m4
- - broken wcwidth check: fix typo reported by David Michael
- <fedora.dm0@gmail.com>
-
- 2/28
- ----
-support/bashbug.sh
- - add ${BUGADDR} to error message printed if sending mail fails
-
-trap.c
- - _run_trap_internal: don't call {save,restore}_pipeline if running
- DEBUG trap; run_debug_trap calls them itself. Fixes bug reported
- by Moe Tunes <moetunes42@gmail.com>
-
-test.c
- - unary_test: fix 'R' case by using find_variable_noref instead of
- find_variable
- - test_unop: add back missing 'R' case. Fixes bug reported by
- NBaH <nbah@sfr.fr>
-
- 3/2
- ---
-jobs.c
- - end_job_control: if job control is active, we changed the terminal's
- process group, so make sure we restore it. Fixes bug reported by
- Eduardo A. Bustamante López <dualbus@gmail.com>
-
- 3/7
- ---
-pcomplete.c
- - pcomp_curtxt: new variable, holds the original text to be completed
- as passed to the programmable completion code
- - pcomp_filename_completion_function: if we are running compgen
- (presumably in a shell function completion) and performing readline
- completion, check the word being completed. If it's not empty, but
- the original word passed to the programmable completion code is an
- empty string (""), call a dequoting function if one is available.
- This compensates for an assumption in bash-completion. Reported by
- Albert Shih <Albert.Shih@obspm.fr>
-
-lib/readline/readline.c
- - _rl_dispatch_subseq: when deciding whether or not to set vi mode's
- idea of the last command, use whether or not the dispatching keymap
- is vi_movement_keymap instead of the key sequence length. The `c',
- `d', and `y' commands all take motion commands as `arguments' and
- will produce key sequences longer than 1 character. The arrow keys
- will end up dispatching out of a different keymap, so the test will
- prevent arrow keys from setting the last command (the problem in
- bash-4.2). Bug report from Daan van Rossum <daan@flash.uchicago.edu>
-
-lib/readline/vi_mode.c
- - _rl_vi_motion_command: convenience function to test whether a key is
- a vi-mode motion command
-
-lib/readline/rlprivate.h
- - _rl_vi_motion_command: extern declaration
-
-parse.y
- - parse_matched_pair: we should not skip processing single quotes in
- posix mode if dolbrace_state == DOLBRACE_QUOTE2 (pattern
- substitution). Fixes bug reported by David Sines
- <dave.gma@googlemail.com>
-
- 3/10
- ----
-lib/readline/readline.c
- - _rl_dispatch_callback: treat a return value of -1 as the end of
- a command dispatch sequence if the current context doesn't
- indicate that we're reading a multi-key sequence
- ((cxt->flags & KSEQ_SUBSEQ) == 0). Turn off the multikey flag
- and free the context chain in this case. Fixes one bug reported
- by Felix Yan <felixonmars@gmail.com> to bug-readline list
- - _rl_dispatch_callback: treat a return value of > 0 the same as 0
- and return from the function, since only values < 0 cause us to
- simulate recursion. Rest of fix for bug tracked down by
- Anatol Pomozov <anatol.pomozov@gmail.com>
-
- 3/11
- ----
-
-execute_cmd.c
- - execute_in_subshell: if a longjmp occurs, set result to
- EXECUTION_FAILURE only if last_command_exit_value == EXECUTION_SUCCESS;
- use value of last_command_exit_value otherwise. Fixes cosmetic
- issue reported by Dennis Lambe Jr. <malsyned@malsyned.net>
-
-doc/bash.1
- - shell-kill-word and shell-backward-kill-word should be documented
- as unbound by default. Report from Oliver Hartley
- <ohartley@talktalk.net>
-
-trap.c
- - run_pending_traps: save value of $? before running trap commands in
- trap_saved_exit_value, like run_exit_trap
- - _run_trap_internal: save value of $? before running trap commands in
- trap_saved_exit_value, like run_exit_trap
-
-builtins/common.c
- - get_exitstat: when running `return' in a trap action, and it is not
- supplied an argument, use the saved exit status in
- trap_saved_exit_value. Fixes Posix problem reported by
- Eduardo A. Bustamante López <dualbus@gmail.com>
-
- 3/13
- ----
-lib/sh/shquote.c
- - sh_contains_quotes: new function, returns true if a given string
- contains any of the shell quote characters (single quote, double
- quote, or backslash)
-
-externs.h
- - sh_contains_quotes: new extern declaration
-
-pcomplete.c
- - pcomp_filename_completion_function: more changes for the benefit of
- bash-completion: if the argument is not the same as the original
- argument passed to the programmable completion code (pcomp_curtxt),
- and we are being run by compgen as part of a completion, dequote the
- argument as bash-completion expects. Fix for the complete-word-
- with-quoted-special-chars problem with bash-completion
-
- 3/17
- ----
-execute_cmd.c
- - execute_intern_function: when in posix mode, make defining a function
- with the same name as a special builtin a fatal error only when the
- shell is not interactive. Interactive shells display an error
- message and go on. From a discussion with Doug McIlroy
- <doug@cs.dartmouth.edu>
-
- 3/18
- ----
-arrayfunc.c
- - assign_compound_array_list: when using expand_assignment_string_to_string
- to expand the value in a ( [x]=y ) compound assignment, make sure
- that we convert 0x0 to "" when expanding [x]= so it doesn't appear as
- if the index is unset. Fixes bug reported by Geir Hauge
- <geir.hauge@gmail.com>
-
-builtins/common.c
- - get_exitstat: update fix of 3/11 to allow the DEBUG trap to use the
- current value of $? instead of the value it had before the trap
- action was run. This is one reason the DEBUG trap exists, and
- extended debug mode uses it. Might want to do this only in Posix
- mode
-
-doc/{bash.1,bashref.texi}
- - return: add language cribbed from Posix saying what happens when
- return is run without an argument from a trap, including the DEBUG
- trap exception
-
- 3/19
- ----
-lib/glob/gmisc.c
- - extglob_pattern_p: make sure ?(patlist) is flagged as an extglob
- pattern
-
-lib/glob/glob.c
- - extglob_skipname: rewrite to handle patterns that begin but do not
- end with an extglob pattern; change test for easy case and loop
- through patterns accordingly. Fixes problem with matching filenames
- with a leading dot reported by Stephane Chazelas
- <stephane.chazelas@gmail.com>
- - wextglob_skipname: make analogous changes
-
- 3/20
- ----
-Makefile.in
- - pass -DDEBUG down to builds in readline and history directories
-
-lib/readline/util.c
- - _rl_trace and related functions are now only compiled in if DEBUG
- is defined
-
-lib/readline/Makefile.in
- - substitute @DEBUG@ and pass -DDEBUG, if necessary, to compilation
- in LOCAL_CFLAGS
-
- 3/21
- ----
-parse.y
- - shell_getc: when checking whether or not to reallocate
- shell_input_line to add trailing newline, don't try to subtract from
- shell_input_line_size. size_t is unsigned, so if its value is less
- than 3 (like, say, 2), size-3 is a very large number and the string
- will not be reallocated. Use len+3 > size instead of len > size-3.
- Fixes bug reported in
- https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1295467
-
- 3/27
- ----
-lib/readline/display.c
- - _rl_clean_up_for_exit: don't bother to call _rl_move_vert to whatever
- readline thinks the last displayed line is if it's 0. Two reasons: a
- minor optimization, and it protects against unwanted moving if this
- function is called twice, as it is when ^C is pressed. Fixes bug
- reported by Egmont Koblinger <egmont@gmail.com>
-
- 3/28
- ----
-bashline.c
- - invalid_completion: new function, used to identify attempts to
- complete words that are syntax errors
- - attempt_shell_completion: if invalid_completion returns true for a
- word in a command position, punt on all completions. Fixes cosmetic
- issue reported by Uwe Storbeck <uwe@ibr.ch>
- - attempt_shell_completion: add clause so that in_command_position
- remains set to 1 for an empty word following a command separator like
- (, &, or |
-
-lib/readline/kill.c
- - rl_yank, rl_yank_nth_arg_internal: don't return -1 from bindable
- functions, return 1 instead
-
-lib/readline/text.c
- - rl_rubout, _rl_rubout_char, rl_delete, rl_change_case,
- rl_transpose_chars, rl_transpose_words, _rl_set_mark_at_pos,
- rl_exchange_point_and_mark, _rl_insert_next, _rl_char_search,
- _rl_char_search_internal:
- don't return -1 from bindable functions, return 1 instead
-
-lib/readline/vi_mode.c
- - rl_vi_end_word, rl_vi_rubout, rl_vi_delete, rl_vi_char_search,
- rl_vi_match, _rl_vi_set_mark, _rl_vi_goto_mark:
- don't return -1 from bindable functions, return 1 instead
-
-lib/readline/macro.c
- - rl_start_kbd_macro, rl_end_kbd_macro:
- don't return -1 from bindable functions, return 1 instead
-
-builtins/setattr.def
- - set_var_attribute: honor setting of no_invisible_vars when setting
- att_invisible on a variable
- - include "../flags.h" for no_invisible_vars
-
-builtins/declare.def
- - declare_internal: honor setting of no_invisible_vars when setting
- att_invisible on a variable
- - include "../flags.h" for no_invisible_vars
-
-Makefile.in,builtins/Makefile.in
- - make sure declare.o and setattr.o depend on flags.h
-
-execute_cmd.c
- - decpoint: new function, returns locale's decimal point or `.' default
- - mkfmt: use decpoint() to get decimal point instead of unconditionally
- using `.'. Fixes bug reported by Andrey Tataranovich
- <tataranovich@gmail.com> in debian bug 741669
-
- 4/10
- ----
-lib/readline/rltypedefs.h
- - add back old Function/VFunction/etc typedefs, since other packages
- (python, samba) use them. Mark as deprecated using gcc and clang
- attributes. Report and fix from Max Horn <max@quendi.de>
-
- 4/14
- ----
-jobs.c
- - run_sigchld_trap: unwind-protect value of this_shell_builtin, since
- it matters in some cases whether or not we are running `wait' or
- `eval'. Fixes bug reported by Eduardo A. Bustamante López
- <dualbus@gmail.com>
-
- 4/18
- ----
-shell.h
- - sh_parser_state_t: add `need_here_doc' flags member, since
- xparse_dolparen (via parse_command) sets it to 0
-
-parse.y
- - gather_here_documents: make sure need_here_doc is > 0, since we
- don't want to just decrement it forever if it ends up < 0. Partial
- fix for bug reported by Jared Yanovich <slovichon@gmail.com>
- - {save,restore}_parser_state: save and restore need_here_doc flag.
- Rest of fix for bug reported by Jared Yanovich <slovichon@gmail.com>
-
- 4/19
- ----
-subst.c
- - cond_expand_word: since we are not supposed to be performing word
- splitting here, set expand_no_split_dollar_star to 1 in addition to
- setting W_NOSPLIT2
- - expand_word_internal: if we have a case where we have an unquoted
- $@ but we are in a case where we don't want to split (W_NOSPLIT2),
- make sure we return a list consisting of a single word with the
- arguments separated by spaces and don't do word splitting. Fixes
- bug reported by Greg Wooledge <wooledg@eeg.ccf.org> from an IRC
- discussion
-
-builtins/hash.def
- - print_portable_hash_info: single-quote pathnames and hashed filenames
- that contain shell metacharacters. Fixes bug reported by
- <g1pi@libero.it> in debian bash bug #739853
-
- 4/20
- ----
-lib/readline/display.c
- - When using horizontal scrolling, the redisplay code erases too much
- of the line containing successful results, so make sure we only
- erase to the end of the line after making sure we move the cursor
- to the end. Fixes bug reported by <Trond.Endrestol@ximalas.info>
-
- 4/23
- ----
-{bashhist,bashline}.c
-builtins{bind,help,type}.def
-lib/glob/glob.c, lib/intl/{loadmsgcat,localealias}.c,lib/sh/mktime.c
- - fixes to memory leaks uncovered by coverity scan
-
- 4/24
- ----
-{bashhist,subst,redir,assoc,jobs,array,trap}.c
-lib/intl/l10flist.c
-builtins/complete.def
- - fixes to memory leaks and other resource usage problems uncovered by
- coverity scan
-
-redir.c
- - do_redirection_internal: if dup2 fails (presumably because of a
- resource limit), close the file descriptor we opened before returning
- error
-
- 4/25
- ----
-config-top.h
- - DEFAULT_BASHRC: new define with the name of the default shell
- startup file
-
-bashline.c
- - bash_directory_completion_matches: don't dequote the directory name.
- If rl_completion_found_quote is non-zero, readline will dequote the
- filename itself. Fixes bug reported by Clark Wang
- <dearvoid@gmail.com>
-
- 4/27
- ----
-subst.c
- - parameter_brace_expand_rhs: if parameter_brace_find_indir returns
- NULL or "", or if it returns something that is not a valid identifier,
- report an error and return &expand_wdesc_error so the error can
- propagate up. Fixes bug reported by Andre Holzhey
- <andre.holzhey@gmx.de>
-
- 4/29
- ----
-subst.c
- - parameter_brace_substring: don't short-circuit right away if the
- value is NULL but we are looking at the positional parameters. Part
- of fix for bug reported by Pierre Gaston <pierre.gaston@gmail.com>
- - pos_params: if there are no positional parameters, only short-circuit
- if we are looking for $1 and above. Rest of fix for bug reported
- by Pierre Gaston <pierre.gaston@gmail.com>
-
-subst.h
- - SD_NOPROCSUB: new flag for skip_to_delim, means to not allow any
- process subsitutions (should not have overloaded SD_NOSKIPCMD)
-
-subst.c
- - skip_to_delim: honor SD_NOPROCSUB flag
-
-make_cmd.c
- - make_arith_for_expr: set W_NOPROCSUB flag in the created word
- - make_arith_for_command: set SD_NOPROCSUB in the flags argument to
- skip_to_delim so we don't treat <( or >( as a process substitution
- (we won't evaluate them in eval_arith_for_expr anyway). Fixes
- bug reported by Pierre Gaston <pierre.gaston@gmail.com>
-
- 5/1
- ---
-lib/glob/gmisc.c
- - glob_dirscan: new function, takes a pattern and a directory separator
- argument and advances the pattern to the last occurrence of the
- separator. Like strrchr, but understands extended glob patterns and
- uses glob_patscan to skip over them
-
-lib/glob/glob.c
- - extglob_skipname: if the extended globbing pattern is invalid, don't
- skip the name
- - glob_filename: if there is a slash in the pattern to be matched, and
- extglob is enabled, use glob_dirscan to find the real last occurrence
- of `/' to avoid being confused by slashes in extglob patterns. Fix
- for bug reported by Pierre Gaston <pierre.gaston@gmail.com>
-
- 5/6
- ---
-variables.c
- - make_local_variable: only set the att_invisible attribute if
- no_invisible_vars isn't set
- - find_variable_for_assignment: new function, intended to be called by
- code that eventually wants to assign a value to the variable; will not
- skip invisible variables; currently identical to find_variable
- - find_variable_no_invisible: new function, finds the first visible
- instance of variable with a given name in the variable context chain;
- eventually will be used to replace find_variable; separate right now
- for testing
-
-variables.h
- - find_variable_for_assignment: extern declaration
- - find_variable_no_invisible: extern declaration
-
- 5/7
- ---
-variables.c
- - make_local_variable: don't clear `invisible' attribute if we are
- returning an existing local variable at the right context. Let the
- upper layers do that. Fixes bug reported by Dan Douglas
- <ormaaj@gmail.com>
-
- 5/8
- ---
-lib/readline/input.c
- - rl_getc: call RL_CHECK_SIGNALS if a read(2) is interrupted (-1/EINTR)
- by SIGALRM or SIGVTALRM (placeholder for non-keyboard-generated
- signals of interest)
-
-builtins/read.def
- - edit_line: call bashline_set_event_hook and
- bashline_reset_event_hook around call to readline(), so the right
- signal handling happens
- - read_builtin: make sure we add an unwind_protect call to
- bashline_reset_event_hook. These changes fix bug reported in
- https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1317476
-
-bashline.c
- - bash_event_hook: make sure we clean up the readline state by calling
- rl_cleanup_after_signal if sigalrm_seen is non-zero. The read builtin
- sets this when it times out
-
- 5/12
- ----
-doc/{bash.1,bashref.texi}
- - clarify language to make it clear that changing attributes of a
- nameref variable (e.g., export), actually changes the attributes of
- the referenced variable. Fixes omission noted by Jeff Haemer
- <jeffrey.haemer@gmail.com>
-
-arrayfunc.c
- - bind_array_var_internal: make sure ENTRY no longer has invisible
- attribute before returning. Fixes bug reported by Geir Hauge
- <geir.hauge@gmail.com>
-
- 5/22
- ----
-execute_cmd.c
- - shell_execve: if execve fails and we return 127 or 126, make sure to
- set last_command_exit_value if a call to file_error or report_error
- causes the shell to exit. This ensures that the shell exits with
- the right value.
-
- 6/6
- ---
-shell.c
- - drop_priv_mode: print an error message on setuid() failure, optionally
- exit if errno == EAGAIN, as it can be on Linux when RLIMIT_NPROC for
- the target user is exceeded.
-
-config-top.h
- - EXIT_ON_SETUID_FAILURE: new settable define, will cause the shell to
- exit if setuid fails with errno == EAGAIN
-
- 6/10
- ----
-parse.y
- - time_command_acceptable: fix so time is accepted everywhere the
- grammar is looking for a `compound_list'. Fixes bug reported by
- Dale Worley <worley@alum.mit.edu>
-
- 6/12
- ----
-subst.c
- - clear_fifo_list: new function, clears FDs associated with open pipes
- in current FIFO list without closing the file descriptors. Can
- possibly be used when shell_execve fails and the shell jumps back
- to top_level and we don't want the shell to close the open FIFOs
- each time through the read-execute loop. Bug reported by Harald
- Koenig <koenig@tat.physik.uni-tuebingen.de>
-
-
- 6/16
- ----
-builtins/shopt.def
- - compat42: make sure the `compat42' option sets the correct variable
- for compatibility level. Fixes bug reported by Ondrej Oprala
- <ooprala@redhat.com>
-
-support/bashbug.sh
- - fix typo when echoing $USAGE. Report from Shantanu Kulkarni
- <djbware@shantanukulkarni.org>
-
-execute_cmd.c
- - shell_execve: before longjmp back to subshell_top_level, clear out the
- FIFO fd list by calling clear_fifo_list so the FDs (which we inherited
- from our parent) aren't closed every time through the read-eval loop.
- Fix for bug reported by Harald Koenig <koenig@tat.physik.uni-tuebingen.de>
-
- 6/18
- ----
-subst.c
- - extract_process_subst: add additional argument: xflags, allow callers to
- pass flags like extract_command_subst
- - extract_process_subst: call xparse_dolparen like command substitution
- to avoid problems when parsing commands constructs with embedded open
- parens. Fixes bug reported by Tim Friske <me@timfriske.com>
-
-subst.h
- - extract_process_subst: modified prototype for extern declaration
-
- 6/19
- ----
-execute_cmd.c
- - execute_pipeline: if running with lastpipe enabled, make sure that we
- check whether or not the job id is valid using INVALID_JOB before
- calling job_exit_status. the jobs list can get frozen and unfrozen in
- the presence of nested pipelines and loops and wait_for can clear a
- job table entry. Fixes bug reported by <scorp.dev.null@gmail.com>
-
-jobs.c
- - freeze_jobs_list: now returns old value of jobs_list_frozen; unused at
- current time
-
-jobs.h
- - freeze_jobs_list: change return value
-
- 6/20
- ----
-lib/glob/smatch.c
- - MEMCHR: single-byte and wide character defines (memchr/wmemchr)
-
-lib/glob/sm_loop.c
- - GMATCH: when the wildcards are the last element of the pattern, make
- sure they do not match a string containing a `/' if FNM_PATHNAME is
- set in FLAGS
- - GMATCH: when recursively calling GMATCH after we see a `*', don't
- try to consume the rest of the pattern with `*' if FNM_PATHNAME is
- set in FLAGS, just consume up to the next slash and then see whether
- or not the rest of the pattern matches. Fixes bug reported by Ian
- Kelling <ian@iankelling.org>
- - GMATCH: when processing `*' in the pattern, after skipping consecutive
- wildcards, if we hit a literal `/' in the pattern and we're looking
- for a pathname, skip characters in the string until we find a `/'
- (no slash means the match fails), and try to match the rest of the
- pattern against the portion of the string after the next `/'. Picked
- up from gnulib/glibc
-
-pathexp.c
- - split_ignorespec: since split_ignorespec gets globbing patterns,
- make sure we call skip_to_delim with the SD_GLOB flag so delimiters
- that occur within bracket expressions don't delimit the pattern.
- Fixes problem with [[:digit:]] in GLOBIGNORE reported by Ian Kelling
- <ian@iankelling.org>
-
-unwind_prot.c
- - unwind_protect_tag_on_stack: new function, returns 1 if unwind-protect
- frame corresponding to `tag' argument is on unwind-protect stack
-
-unwind_prot.h
- - unwind_protect_tag_on_stack: extern declaration
-
- 6/30
- ----
-lib/readline/misc.c
- - _rl_revert_all_lines: set entry->data to 0 after assigning it to
- rl_undo_list to avoid pointer aliasing problems that would result
- in entry->line being freed by an undo. The subsequent free would
- be a double free. Report and fix from Jared Yanovich
- <slovichon@gmail.com>
-
-subst.c
- - command_substitute: other shells do not appear to inherit the -v
- option when reading and executing command substitutions. Reported
- by Ondrej Oprala <ooprala@redhat.com>
-
- 7/1
- ---
-config-top.h
- - CHECKHASH_DEFAULT: new define that supplies the default value for
- check_hashed_filenames (`checkhash' shopt option); still 0 by default
-
-findcmd.c
- - check_hashed_filenames: initialize using CHECKHASH_DEFAULT
-
-lib/readline/histexpand.c
- - history_expand: double quotes can inhibit recognition of the history
- comment character if history_quotes_inhibit_expansion is non-zero
-
-lib/readline/doc/{history.3,hstech.texi}
- - history_quotes_inhibit_expansion: expand definition to note that it
- inhibits scanning for the history comment character as well; correct
- typo to make it clear that it only works on double-quoted strings
-
-lib/sh/zgetline.c
- - add new fourth argument: DELIM, allows delimiter to be something
- other than newline (if DELIM != '\n', UNBUFFERED_READ should be
- non-zero)
- - UNBUFFERED_READ is now fifth argument
- - check character against DELIM rather than strictly newline
-
-externs.h
- - zgetline: change function prototype for extern declaration
-
-builtins/mapfile.def
- - mapfile: change calling sequence for zgetline calls
- - mapfile_builtin: new -d option: DELIM, like in read builtin
- - mapfile_builtin: pass `delim' to mapfile() as new argument; default
- to '\n' unless -d option supplied
- - mapfile: take new DELIM argument, pass to zgetline
- - mapfile: if DELIM != '\n', set unbuffered_read to 1
-
-doc/{bash.1,bashref.texi}
- - mapfile: document new `-d DELIM' option
-
- 7/5
- ---
-lib/readline/histfile.c
- - history_truncate_file: if there is an error writing the truncated
- history list back to the history file, use the same strategy as
- history_do_write: create a backup file, rename the history file to
- the backup file, and restore the original history file from the
- backup file name if the write or the close fails. Suggestion from
- Chen Gang <gang.chen.5i5j@gmail.com> to bug-readline
-
-execute_cmd.c
- - evalnest, evalnest_max: new variables establishing maximum number of
- recursive `eval' calls; current max is 4096
- - execute_builtin: unwind-protect value of evalnest around calls to
- eval builtin. Suggested by Oliver Morais <oliver.morais@gmail.com>
- - {initialize_subshell,execute_subshell_builtin_or_function}: reset
- evalnest to 0 in a subshell
-
-builtins/setattr.def
- - show_name_attributes: show a variable's attributes even if it's
- invisible (don't show any value since it has none). This means that
- declare -p var will display VAR's attributes even when var marked
- as invisible. Feature request from Peggy Russell
- <prusselltechgroup@gmail.com>
- - show_var_attributes: don't print assignment if array or assoc
- attribute is set but variable marked as invisible
-
-tests/array.right
- - special note: changed all declare -a output tests because the shell
- will no longer print out values for invisible array variables. This
- is a change, but one for correctness:
-
- declare -a foo='()'
- and
- declare -a foo
- are not equivalent
-
- 7/22
- ----
-subst.c
- - parameter_brace_expand: after calling parameter_brace_expand_indir,
- turn off the W_ARRAYIND flag in the word it returns, because there
- is no way for it to return the index that should be used, and the
- rest of the function assumes that IND is valid if W_ARRAYIND is set.
- Fixes bug reported by Corentin Peuvrel <cpeuvrel@pom-monitoring.com>
-
- 8/2
- ---
-parse.y
- - read_token_word: if we read a character that will end a command
- substitution, don't skip over quoted newlines when we read an
- additional character to figure out whether it's a two-character
- token. This lets the higher layers deal with quoted newlines after
- the command substitution. Fixes bug reported by EmanueL Czirai
- <amanual@riseup.net>
-
- 8/11
- ----
-execute_cmd.c
- - execute_pipeline: check whether lastpipe_jid corresponds to a valid
- job before calling append_process, for the same reason as fix from
- 6/19. Fixes bug reported by <lolilolicon@gmail.com>
-
- 8/12
- ----
-lib/sh/unicode.c
- - stub_charset: use strncpy instead of strcpy because we are copying
- into a local fixed-length buffer. Fixes vulnerability reported by
- <romerox.adrian@gmail.com>
-
-execute_cmd.c
- - execute_pipeline: if we don't call append_process, call
- wait_for_single_pid to get the status of `lastpid', since that will
- check the status of already-reaped processes. Fixes spurious error
- message about non-existent process from fix of 8/11
-
- 8/15
- ----
-jobs.c
- - running_in_background: new variable, keeps track of whether or not we
- are running in the background (not perfect yet)
- - initialize_job_control: even if we are not turning on job control,
- get the terminal pgrp so we can use it later
- - {set_job_control,initialize_job_control}: set running_in_background
- to 1 if terminal pgrp != shell pgrp
- - {stop_pipeline,make_child,wait_for}: if we are running in the
- background, don't mess with the terminal's process group; assume that
- the parent shell will do that. Fixes bug reprted by Greg Wooledge
- <wooledg@eeg.ccf.org>
-
-shell.c
- - shell_reinitialize: reset running_in_background back to 0
-
- 8/24
- ----
-execute_cmd.c
- - {execute_connection,execute_command_internal}: make sure that
- asynchronous commands always set $? to 0 and are not affected by the
- command's exit status being inverted using `!'. Fixes bug reported
- by Vincent Lefevre <vincent@vinc17.net>
-
-lib/readline/display.c
- - rl_message: call vsnprintf with full msg_bufsiz, since it counts
- one fewer than the buffer length passed as an argument. Bug report
- and fix from Dylan Cali <calid1984@gmail.com>
-
- 8/26
- ----
-builtins/evalstring.c
- - evalstring: if CURRENT_TOKEN == yacc_EOF, reset it to newline. This is
- instead of calling reset_parser(); that might still be needed. Fixes
- bug with eval and a subsequent statement ending with EOF reported by
- <jim.avera@gmail.org>
-
-pcomplete.c
- - filter_stringlist: when extglob is on, a leading ! in the filter
- pattern should be left alone when it introduces a !(pat) pattern;
- otherwise it messes up the pattern. Fixes bug reported by David
- Korn <dgkorn@gmail.com>
-
- 8/27
- ----
-doc/{bash.1,bashref.texi}
- - clarify the behavior of bash when given the -c option, since $0 is
- technically not a positional parameter. Bug reported by Stephane
- Chazelas <stephane.chazelas@gmail.com>
-
- 8/28
- ----
-lib/readline/history.c
- - add_history: use history_max_entries (if history is stifled) or
- DEFAULT_HISTORY_INITIAL_SIZE if not (new define, defaults to 502)
- to size the initial allocation of the history array. Assumption
- is that this will reduce the number of allocations
-
- 8/29
- ----
-execute_command.c:
- - sourcenest, sourcenest_max: new variables used to track level of
- sourced files and (maybe) one day catch infinite source recursion
- - execute_builtin: if current source level exceeds sourcenest_max,
- trigger an error and jump back to the top level
- - {initialize_subshell,execute_subshell_builtin_or_function}: reset
- sourcenest to 0 in a subshell
-
- 9/2
- ---
-variables.c
- - bind_variable: if a nameref expands to an array reference, make
- sure that assign_array_element gets called (maybe even
- recursively) instead of bind_variable_internal, so invalid variable
- names (like arr[0]) don't get created. Fixes bug reported by
- <lolilolicon@gmail.com>
-
- 9/3
- ---
-execute_cmd.c
- - evalnest_max,sourcenest_max: initialize from EVALNEST_MAX and
- SOURCENEST_MAX, respectively. Feature suggested by
- <bogun.dmitriy@gmail.com>
-
-config-top.h
- - define EVALNEST_MAX and SOURCENEST_MAX to 0
-
- 9/6
- ---
-bashline.c
- - find_cmd_start: fix to (crudely) deal with >| token; even though
- skip_to_delim finds `|' as a delimiter, we call it again and use
- what the second call finds. Fixes bug reported by Dan Jacobson
- <jidanni@jidanni.org>
-
-findcmd.c
- - find_in_path_element: if in posix mode, do not expand a literal
- tilde in a $PATH element
-
-doc/bashref.texi
- - add change to tilde expansion in $PATH elements to posix mode
- description
-
-builtins/common.h
- - ISHELP: new define for builtins that do their own option parsing
- and don't use internal_getopt(); checks whether argument is --help
- - CHECK_HELPOPT: convenience define to help builtins that do their
- own option parsing to check for --help with one line of code
- - CASE_HELPOPT: convenience define to help builtins that use
- internal_getopt() check for --help with one line of code
-
-builtins/help.def
- - builtin_help: new function, prints out --help output for current
- builtin
-
-builtins/{kill,let,pushd}.def
- - add CHECK_HELPOPT to builtins that use ISOPTION; call builtin_help
- and return EX_USAGE (kill/let/pushd/popd/dirs)
-
-builtins/{caller,fg_bg}.def
- - use CHECK_HELPOPT to recognize --help, since these builtins perform
- checks that can cause them to return before calling no_options
- (caller/fg/bg)
-
-builtins/{exit,return}.def
- - use CHECK_HELPOPT to recognize --help before calling get_exitstat()
- (return/exit/logout)
-
-builtins/{break,shift}.def
- - use CHECK_HELPOPT to recognize --help before any other checks
- (break/continue/shift)
-
-builtins/bashgetopt.h
- - GETOPT_EOF: convenience define
- - GETOPT_HELP: new define, to indicate internal_getopt saw --help
-
-builtins/bashgetopt.c
- - internal_getopt: return GETOPT_HELP for --help
-
-builtins/common.c
- - no_options: recognize --help, call builtin_help and return 2
- (builtin/eval/source/./times)
-
-builtins/command.def
- - use CASE_HELPOPT() to handle --help after calling internal_getopt()
- (command)
-
-builtins/{colon,echo,test}.def
- - do not recognize --help (:/true/false/echo/test)
-
- 9/8
- ---
-sig.c
- - termsig_sighandler: if readline is active now, set the bashline event
- hook. Old code just set it for interactive shells. Part of fix for
- bug reported by <mickael9@gmail.com>
-
-bashline.c
- - bash_event_hook: call rl_cleanup_after_signal if terminating_signal
- is non-zero, since check_signals_and_traps() will cause the shell to
- exit if it is and we want to clean up the readline state first. Rest
- of fix for bug reported by <mickael9@gmail.com>
-
- 9/9
- ---
-jobs.c
- - waitchld: when running the wait builtin in posix mode, with a trap set
- on SIGCHLD, use queue_sigchld_trap instead of trap_handler (SIGCHLD),
- otherwise you will lose SIGCHLDs when children_exited > 1. Fixes bug
- reported by <crispusfairbairn@gmail.com>
-
-builtins/read.def
- - read_builtin: if we are changing the tty settings, call
- initialize_terminating_signals so we have a chance to catch all
- terminating signals and potentially clean up the terminal before
- exiting
- - read_builtin: tty_modified: new variable, set to 1 if we change the
- terminal attributes and have to call ttyrestore() to restore them
- - if one of the `reads' returns -1/EINTR due to a terminating signal,
- and we have modified the terminal, call ttyrestore before calling
- CHECK_TERMSIG
- - ttyrestore: set tty_modified to 0 when called
-
- 9/10
- ----
-builtins/read.def
- - termsave: now global to file so other functions can use it
- - read_tty_cleanup: if tty_modified is non-zero, call ttycleanup to restore
- old terminal settings and turn off tty_modified
-
-sig.c
- - termsig_handler: call read_tty_cleanup if currently executing read
- builtin; it does the right thing. Final piece of fix for bug reported
- by Jan Rome <jan.rome@gmail.com>
-
- 9/11
- ----
-general.c
- - printable_filename: general function to return a printable representation
- of a string (presumed to be a filename)
-
-general.h
- - extern declaration for printable_filename
-
-execute_cmd.c
- - execute_disk_command: use printable_filename
-
-builtins/{bind,cd,enable,hash,source}.def
- - use printable_filename as appropriate when printing error messages.
- From a suggestion by Vincent Lefevre <vincent@vinc17.net>
-
-builtins/bind.def
- - use CASE_HELPOPT() to handle --help after calling internal_getopt()
- (bind)
-
- 9/12
- ----
-builtins/common.h
- - SEVAL_FUNCDEF: new flag for parse_and_execute; it means that we only
- accept a single function definition command, as when we are importing
- functions from the environment
- - SEVAL_ONECMD: new flag for parse_and_execute; for future use
-
-builtins/evalstring.c
- - parse_and_execute: if the SEVAL_FUNCDEF flag is set, disallow anything
- but a function definition command
-
-variables.c
- - initialize_shell_variables: don't allow functions with invalid names
- to be imported from the environment, even though we still allow them
- to be defined
- - initialize_shell_variables: when importing function definitions from
- the environment, call parse_and_execute with the SEVAL_FUNCDEF flag
- to force the command to be just a function definition
-
-subst.c
- - param_expand: when expanding a $name variable expansion, make sure that
- the variable is visible and set before following the nameref chain
- - param_expand: when expanding a $name variable expansion and following the
- nameref chain, make sure the resulting variable is visible and set
- before using it
-
- 9/13
- ----
-variables.c
- - initialize_shell_variables: when importing function definitions from
- environment, use SEVAL_ONECMD flag for parse_and_execute
-
-builtins/evalstring.c
- - parse_and_execute: if SEVAL_ONECMD flag set, return immediately after
- calling execute_command_internal
+++ /dev/null
-/* bashline.c -- Bash's interface to the readline library. */
-
-/* Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "config.h"
-
-#if defined (READLINE)
-
-#include "bashtypes.h"
-#include "posixstat.h"
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#if defined (HAVE_GRP_H)
-# include <grp.h>
-#endif
-
-#if defined (HAVE_NETDB_H)
-# include <netdb.h>
-#endif
-
-#include <signal.h>
-
-#include <stdio.h>
-#include "chartypes.h"
-#include "bashansi.h"
-#include "bashintl.h"
-
-#include "shell.h"
-#include "input.h"
-#include "builtins.h"
-#include "bashhist.h"
-#include "bashline.h"
-#include "execute_cmd.h"
-#include "findcmd.h"
-#include "pathexp.h"
-#include "shmbutil.h"
-#include "trap.h"
-
-#include "builtins/common.h"
-
-#include <readline/rlconf.h>
-#include <readline/readline.h>
-#include <readline/history.h>
-
-#include <glob/glob.h>
-
-#if defined (ALIAS)
-# include "alias.h"
-#endif
-
-#if defined (PROGRAMMABLE_COMPLETION)
-# include "pcomplete.h"
-#endif
-
-/* These should agree with the defines for emacs_mode and vi_mode in
- rldefs.h, even though that's not a public readline header file. */
-#ifndef EMACS_EDITING_MODE
-# define NO_EDITING_MODE -1
-# define EMACS_EDITING_MODE 1
-# define VI_EDITING_MODE 0
-#endif
-
-#define RL_BOOLEAN_VARIABLE_VALUE(s) ((s)[0] == 'o' && (s)[1] == 'n' && (s)[2] == '\0')
-
-#if defined (BRACE_COMPLETION)
-extern int bash_brace_completion __P((int, int));
-#endif /* BRACE_COMPLETION */
-
-/* To avoid including curses.h/term.h/termcap.h and that whole mess. */
-#ifdef _MINIX
-extern int tputs __P((const char *string, int nlines, void (*outx)(int)));
-#else
-extern int tputs __P((const char *string, int nlines, int (*outx)(int)));
-#endif
-
-/* Forward declarations */
-
-/* Functions bound to keys in Readline for Bash users. */
-static int shell_expand_line __P((int, int));
-static int display_shell_version __P((int, int));
-static int operate_and_get_next __P((int, int));
-
-static int bash_ignore_filenames __P((char **));
-static int bash_ignore_everything __P((char **));
-
-#if defined (BANG_HISTORY)
-static char *history_expand_line_internal __P((char *));
-static int history_expand_line __P((int, int));
-static int tcsh_magic_space __P((int, int));
-#endif /* BANG_HISTORY */
-#ifdef ALIAS
-static int alias_expand_line __P((int, int));
-#endif
-#if defined (BANG_HISTORY) && defined (ALIAS)
-static int history_and_alias_expand_line __P((int, int));
-#endif
-
-static int bash_forward_shellword __P((int, int));
-static int bash_backward_shellword __P((int, int));
-static int bash_kill_shellword __P((int, int));
-static int bash_backward_kill_shellword __P((int, int));
-
-/* Helper functions for Readline. */
-static char *restore_tilde __P((char *, char *));
-static char *maybe_restore_tilde __P((char *, char *));
-
-static char *bash_filename_rewrite_hook __P((char *, int));
-
-static void bash_directory_expansion __P((char **));
-static int bash_filename_stat_hook __P((char **));
-static int bash_command_name_stat_hook __P((char **));
-static int bash_directory_completion_hook __P((char **));
-static int filename_completion_ignore __P((char **));
-static int bash_push_line __P((void));
-
-static int executable_completion __P((const char *, int));
-
-static rl_icppfunc_t *save_directory_hook __P((void));
-static void restore_directory_hook __P((rl_icppfunc_t));
-
-static void cleanup_expansion_error __P((void));
-static void maybe_make_readline_line __P((char *));
-static void set_up_new_line __P((char *));
-
-static int check_redir __P((int));
-static char **attempt_shell_completion __P((const char *, int, int));
-static char *variable_completion_function __P((const char *, int));
-static char *hostname_completion_function __P((const char *, int));
-static char *command_subst_completion_function __P((const char *, int));
-
-static void build_history_completion_array __P((void));
-static char *history_completion_generator __P((const char *, int));
-static int dynamic_complete_history __P((int, int));
-static int bash_dabbrev_expand __P((int, int));
-
-static void initialize_hostname_list __P((void));
-static void add_host_name __P((char *));
-static void snarf_hosts_from_file __P((char *));
-static char **hostnames_matching __P((char *));
-
-static void _ignore_completion_names __P((char **, sh_ignore_func_t *));
-static int name_is_acceptable __P((const char *));
-static int test_for_directory __P((const char *));
-static int return_zero __P((const char *));
-
-static char *bash_dequote_filename __P((char *, int));
-static char *quote_word_break_chars __P((char *));
-static void set_filename_bstab __P((const char *));
-static char *bash_quote_filename __P((char *, int, char *));
-
-#ifdef _MINIX
-static void putx __P((int));
-#else
-static int putx __P((int));
-#endif
-static int bash_execute_unix_command __P((int, int));
-static void init_unix_command_map __P((void));
-static int isolate_sequence __P((char *, int, int, int *));
-
-static int set_saved_history __P((void));
-
-#if defined (ALIAS)
-static int posix_edit_macros __P((int, int));
-#endif
-
-static int bash_event_hook __P((void));
-
-#if defined (PROGRAMMABLE_COMPLETION)
-static int find_cmd_start __P((int));
-static int find_cmd_end __P((int));
-static char *find_cmd_name __P((int, int *, int *));
-static char *prog_complete_return __P((const char *, int));
-
-static char **prog_complete_matches;
-#endif
-
-/* Variables used here but defined in other files. */
-#if defined (BANG_HISTORY)
-extern int hist_verify;
-#endif
-
-extern int current_command_line_count, saved_command_line_count;
-extern int last_command_exit_value;
-extern int array_needs_making;
-extern int posixly_correct, no_symbolic_links;
-extern int sigalrm_seen;
-extern char *current_prompt_string, *ps1_prompt;
-extern STRING_INT_ALIST word_token_alist[];
-extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
-
-/* SPECIFIC_COMPLETION_FUNCTIONS specifies that we have individual
- completion functions which indicate what type of completion should be
- done (at or before point) that can be bound to key sequences with
- the readline library. */
-#define SPECIFIC_COMPLETION_FUNCTIONS
-
-#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
-static int bash_specific_completion __P((int, rl_compentry_func_t *));
-
-static int bash_complete_filename_internal __P((int));
-static int bash_complete_username_internal __P((int));
-static int bash_complete_hostname_internal __P((int));
-static int bash_complete_variable_internal __P((int));
-static int bash_complete_command_internal __P((int));
-
-static int bash_complete_filename __P((int, int));
-static int bash_possible_filename_completions __P((int, int));
-static int bash_complete_username __P((int, int));
-static int bash_possible_username_completions __P((int, int));
-static int bash_complete_hostname __P((int, int));
-static int bash_possible_hostname_completions __P((int, int));
-static int bash_complete_variable __P((int, int));
-static int bash_possible_variable_completions __P((int, int));
-static int bash_complete_command __P((int, int));
-static int bash_possible_command_completions __P((int, int));
-
-static char *glob_complete_word __P((const char *, int));
-static int bash_glob_completion_internal __P((int));
-static int bash_glob_complete_word __P((int, int));
-static int bash_glob_expand_word __P((int, int));
-static int bash_glob_list_expansions __P((int, int));
-
-#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
-
-static int edit_and_execute_command __P((int, int, int, char *));
-#if defined (VI_MODE)
-static int vi_edit_and_execute_command __P((int, int));
-static int bash_vi_complete __P((int, int));
-#endif
-static int emacs_edit_and_execute_command __P((int, int));
-
-/* Non-zero once initalize_readline () has been called. */
-int bash_readline_initialized = 0;
-
-/* If non-zero, we do hostname completion, breaking words at `@' and
- trying to complete the stuff after the `@' from our own internal
- host list. */
-int perform_hostname_completion = 1;
-
-/* If non-zero, we don't do command completion on an empty line. */
-int no_empty_command_completion;
-
-/* Set FORCE_FIGNORE if you want to honor FIGNORE even if it ignores the
- only possible matches. Set to 0 if you want to match filenames if they
- are the only possible matches, even if FIGNORE says to. */
-int force_fignore = 1;
-
-/* Perform spelling correction on directory names during word completion */
-int dircomplete_spelling = 0;
-
-/* Expand directory names during word/filename completion. */
-#if DIRCOMPLETE_EXPAND_DEFAULT
-int dircomplete_expand = 1;
-int dircomplete_expand_relpath = 1;
-#else
-int dircomplete_expand = 0;
-int dircomplete_expand_relpath = 0;
-#endif
-
-/* When non-zero, perform `normal' shell quoting on completed filenames
- even when the completed name contains a directory name with a shell
- variable referene, so dollar signs in a filename get quoted appropriately.
- Set to zero to remove dollar sign (and braces or parens as needed) from
- the set of characters that will be quoted. */
-int complete_fullquote = 1;
-
-static char *bash_completer_word_break_characters = " \t\n\"'@><=;|&(:";
-static char *bash_nohostname_word_break_characters = " \t\n\"'><=;|&(:";
-/* )) */
-
-static const char *default_filename_quote_characters = " \t\n\\\"'@<>=;|&()#$`?*[!:{~"; /*}*/
-static char *custom_filename_quote_characters = 0;
-static char filename_bstab[256];
-
-static rl_hook_func_t *old_rl_startup_hook = (rl_hook_func_t *)NULL;
-
-static int dot_in_path = 0;
-
-/* Set to non-zero when dabbrev-expand is running */
-static int dabbrev_expand_active = 0;
-
-/* What kind of quoting is performed by bash_quote_filename:
- COMPLETE_DQUOTE = double-quoting the filename
- COMPLETE_SQUOTE = single_quoting the filename
- COMPLETE_BSQUOTE = backslash-quoting special chars in the filename
-*/
-#define COMPLETE_DQUOTE 1
-#define COMPLETE_SQUOTE 2
-#define COMPLETE_BSQUOTE 3
-static int completion_quoting_style = COMPLETE_BSQUOTE;
-
-/* Flag values for the final argument to bash_default_completion */
-#define DEFCOMP_CMDPOS 1
-
-/* Change the readline VI-mode keymaps into or out of Posix.2 compliance.
- Called when the shell is put into or out of `posix' mode. */
-void
-posix_readline_initialize (on_or_off)
- int on_or_off;
-{
- if (on_or_off)
- rl_variable_bind ("comment-begin", "#");
-#if defined (VI_MODE)
- rl_bind_key_in_map (CTRL ('I'), on_or_off ? rl_insert : rl_complete, vi_insertion_keymap);
-#endif
-}
-
-void
-reset_completer_word_break_chars ()
-{
- rl_completer_word_break_characters = perform_hostname_completion ? savestring (bash_completer_word_break_characters) : savestring (bash_nohostname_word_break_characters);
-}
-
-/* When this function returns, rl_completer_word_break_characters points to
- dynamically allocated memory. */
-int
-enable_hostname_completion (on_or_off)
- int on_or_off;
-{
- int old_value;
- char *at, *nv, *nval;
-
- old_value = perform_hostname_completion;
-
- if (on_or_off)
- {
- perform_hostname_completion = 1;
- rl_special_prefixes = "$@";
- }
- else
- {
- perform_hostname_completion = 0;
- rl_special_prefixes = "$";
- }
-
- /* Now we need to figure out how to appropriately modify and assign
- rl_completer_word_break_characters depending on whether we want
- hostname completion on or off. */
-
- /* If this is the first time this has been called
- (bash_readline_initialized == 0), use the sames values as before, but
- allocate new memory for rl_completer_word_break_characters. */
-
- if (bash_readline_initialized == 0 &&
- (rl_completer_word_break_characters == 0 ||
- rl_completer_word_break_characters == rl_basic_word_break_characters))
- {
- if (on_or_off)
- rl_completer_word_break_characters = savestring (bash_completer_word_break_characters);
- else
- rl_completer_word_break_characters = savestring (bash_nohostname_word_break_characters);
- }
- else
- {
- /* See if we have anything to do. */
- at = strchr (rl_completer_word_break_characters, '@');
- if ((at == 0 && on_or_off == 0) || (at != 0 && on_or_off != 0))
- return old_value;
-
- /* We have something to do. Do it. */
- nval = (char *)xmalloc (strlen (rl_completer_word_break_characters) + 1 + on_or_off);
-
- if (on_or_off == 0)
- {
- /* Turn it off -- just remove `@' from word break chars. We want
- to remove all occurrences of `@' from the char list, so we loop
- rather than just copy the rest of the list over AT. */
- for (nv = nval, at = rl_completer_word_break_characters; *at; )
- if (*at != '@')
- *nv++ = *at++;
- else
- at++;
- *nv = '\0';
- }
- else
- {
- nval[0] = '@';
- strcpy (nval + 1, rl_completer_word_break_characters);
- }
-
- free (rl_completer_word_break_characters);
- rl_completer_word_break_characters = nval;
- }
-
- return (old_value);
-}
-
-/* Called once from parse.y if we are going to use readline. */
-void
-initialize_readline ()
-{
- rl_command_func_t *func;
- char kseq[2];
-
- if (bash_readline_initialized)
- return;
-
- rl_terminal_name = get_string_value ("TERM");
- rl_instream = stdin;
- rl_outstream = stderr;
-
- /* Allow conditional parsing of the ~/.inputrc file. */
- rl_readline_name = "Bash";
-
- /* Add bindable names before calling rl_initialize so they may be
- referenced in the various inputrc files. */
- rl_add_defun ("shell-expand-line", shell_expand_line, -1);
-#ifdef BANG_HISTORY
- rl_add_defun ("history-expand-line", history_expand_line, -1);
- rl_add_defun ("magic-space", tcsh_magic_space, -1);
-#endif
-
- rl_add_defun ("shell-forward-word", bash_forward_shellword, -1);
- rl_add_defun ("shell-backward-word", bash_backward_shellword, -1);
- rl_add_defun ("shell-kill-word", bash_kill_shellword, -1);
- rl_add_defun ("shell-backward-kill-word", bash_backward_kill_shellword, -1);
-
-#ifdef ALIAS
- rl_add_defun ("alias-expand-line", alias_expand_line, -1);
-# ifdef BANG_HISTORY
- rl_add_defun ("history-and-alias-expand-line", history_and_alias_expand_line, -1);
-# endif
-#endif
-
- /* Backwards compatibility. */
- rl_add_defun ("insert-last-argument", rl_yank_last_arg, -1);
-
- rl_add_defun ("operate-and-get-next", operate_and_get_next, -1);
- rl_add_defun ("display-shell-version", display_shell_version, -1);
- rl_add_defun ("edit-and-execute-command", emacs_edit_and_execute_command, -1);
-
-#if defined (BRACE_COMPLETION)
- rl_add_defun ("complete-into-braces", bash_brace_completion, -1);
-#endif
-
-#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
- rl_add_defun ("complete-filename", bash_complete_filename, -1);
- rl_add_defun ("possible-filename-completions", bash_possible_filename_completions, -1);
- rl_add_defun ("complete-username", bash_complete_username, -1);
- rl_add_defun ("possible-username-completions", bash_possible_username_completions, -1);
- rl_add_defun ("complete-hostname", bash_complete_hostname, -1);
- rl_add_defun ("possible-hostname-completions", bash_possible_hostname_completions, -1);
- rl_add_defun ("complete-variable", bash_complete_variable, -1);
- rl_add_defun ("possible-variable-completions", bash_possible_variable_completions, -1);
- rl_add_defun ("complete-command", bash_complete_command, -1);
- rl_add_defun ("possible-command-completions", bash_possible_command_completions, -1);
- rl_add_defun ("glob-complete-word", bash_glob_complete_word, -1);
- rl_add_defun ("glob-expand-word", bash_glob_expand_word, -1);
- rl_add_defun ("glob-list-expansions", bash_glob_list_expansions, -1);
-#endif
-
- rl_add_defun ("dynamic-complete-history", dynamic_complete_history, -1);
- rl_add_defun ("dabbrev-expand", bash_dabbrev_expand, -1);
-
- /* Bind defaults before binding our custom shell keybindings. */
- if (RL_ISSTATE(RL_STATE_INITIALIZED) == 0)
- rl_initialize ();
-
- /* Bind up our special shell functions. */
- rl_bind_key_if_unbound_in_map (CTRL('E'), shell_expand_line, emacs_meta_keymap);
-
-#ifdef BANG_HISTORY
- rl_bind_key_if_unbound_in_map ('^', history_expand_line, emacs_meta_keymap);
-#endif
-
- rl_bind_key_if_unbound_in_map (CTRL ('O'), operate_and_get_next, emacs_standard_keymap);
- rl_bind_key_if_unbound_in_map (CTRL ('V'), display_shell_version, emacs_ctlx_keymap);
-
- /* In Bash, the user can switch editing modes with "set -o [vi emacs]",
- so it is not necessary to allow C-M-j for context switching. Turn
- off this occasionally confusing behaviour. */
- kseq[0] = CTRL('J');
- kseq[1] = '\0';
- func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
- if (func == rl_vi_editing_mode)
- rl_unbind_key_in_map (CTRL('J'), emacs_meta_keymap);
- kseq[0] = CTRL('M');
- func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
- if (func == rl_vi_editing_mode)
- rl_unbind_key_in_map (CTRL('M'), emacs_meta_keymap);
-#if defined (VI_MODE)
- rl_unbind_key_in_map (CTRL('E'), vi_movement_keymap);
-#endif
-
-#if defined (BRACE_COMPLETION)
- rl_bind_key_if_unbound_in_map ('{', bash_brace_completion, emacs_meta_keymap); /*}*/
-#endif /* BRACE_COMPLETION */
-
-#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
- rl_bind_key_if_unbound_in_map ('/', bash_complete_filename, emacs_meta_keymap);
- rl_bind_key_if_unbound_in_map ('/', bash_possible_filename_completions, emacs_ctlx_keymap);
-
- /* Have to jump through hoops here because there is a default binding for
- M-~ (rl_tilde_expand) */
- kseq[0] = '~';
- kseq[1] = '\0';
- func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
- if (func == 0 || func == rl_tilde_expand)
- rl_bind_keyseq_in_map (kseq, bash_complete_username, emacs_meta_keymap);
-
- rl_bind_key_if_unbound_in_map ('~', bash_possible_username_completions, emacs_ctlx_keymap);
-
- rl_bind_key_if_unbound_in_map ('@', bash_complete_hostname, emacs_meta_keymap);
- rl_bind_key_if_unbound_in_map ('@', bash_possible_hostname_completions, emacs_ctlx_keymap);
-
- rl_bind_key_if_unbound_in_map ('$', bash_complete_variable, emacs_meta_keymap);
- rl_bind_key_if_unbound_in_map ('$', bash_possible_variable_completions, emacs_ctlx_keymap);
-
- rl_bind_key_if_unbound_in_map ('!', bash_complete_command, emacs_meta_keymap);
- rl_bind_key_if_unbound_in_map ('!', bash_possible_command_completions, emacs_ctlx_keymap);
-
- rl_bind_key_if_unbound_in_map ('g', bash_glob_complete_word, emacs_meta_keymap);
- rl_bind_key_if_unbound_in_map ('*', bash_glob_expand_word, emacs_ctlx_keymap);
- rl_bind_key_if_unbound_in_map ('g', bash_glob_list_expansions, emacs_ctlx_keymap);
-
-#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
-
- kseq[0] = TAB;
- kseq[1] = '\0';
- func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
- if (func == 0 || func == rl_tab_insert)
- rl_bind_key_in_map (TAB, dynamic_complete_history, emacs_meta_keymap);
-
- /* Tell the completer that we want a crack first. */
- rl_attempted_completion_function = attempt_shell_completion;
-
- /* Tell the completer that we might want to follow symbolic links or
- do other expansion on directory names. */
- set_directory_hook ();
-
- rl_filename_rewrite_hook = bash_filename_rewrite_hook;
-
- rl_filename_stat_hook = bash_filename_stat_hook;
-
- /* Tell the filename completer we want a chance to ignore some names. */
- rl_ignore_some_completions_function = filename_completion_ignore;
-
- /* Bind C-xC-e to invoke emacs and run result as commands. */
- rl_bind_key_if_unbound_in_map (CTRL ('E'), emacs_edit_and_execute_command, emacs_ctlx_keymap);
-#if defined (VI_MODE)
- rl_bind_key_if_unbound_in_map ('v', vi_edit_and_execute_command, vi_movement_keymap);
-# if defined (ALIAS)
- rl_bind_key_if_unbound_in_map ('@', posix_edit_macros, vi_movement_keymap);
-# endif
-
- rl_bind_key_in_map ('\\', bash_vi_complete, vi_movement_keymap);
- rl_bind_key_in_map ('*', bash_vi_complete, vi_movement_keymap);
- rl_bind_key_in_map ('=', bash_vi_complete, vi_movement_keymap);
-#endif
-
- rl_completer_quote_characters = "'\"";
-
- /* This sets rl_completer_word_break_characters and rl_special_prefixes
- to the appropriate values, depending on whether or not hostname
- completion is enabled. */
- enable_hostname_completion (perform_hostname_completion);
-
- /* characters that need to be quoted when appearing in filenames. */
- rl_filename_quote_characters = default_filename_quote_characters;
- set_filename_bstab (rl_filename_quote_characters);
-
- rl_filename_quoting_function = bash_quote_filename;
- rl_filename_dequoting_function = bash_dequote_filename;
- rl_char_is_quoted_p = char_is_quoted;
-
-#if 0
- /* This is superfluous and makes it impossible to use tab completion in
- vi mode even when explicitly binding it in ~/.inputrc. sv_strict_posix()
- should already have called posix_readline_initialize() when
- posixly_correct was set. */
- if (posixly_correct)
- posix_readline_initialize (1);
-#endif
-
- bash_readline_initialized = 1;
-}
-
-void
-bashline_reinitialize ()
-{
- bash_readline_initialized = 0;
-}
-
-void
-bashline_set_event_hook ()
-{
- rl_signal_event_hook = bash_event_hook;
-}
-
-void
-bashline_reset_event_hook ()
-{
- rl_signal_event_hook = 0;
-}
-
-/* On Sun systems at least, rl_attempted_completion_function can end up
- getting set to NULL, and rl_completion_entry_function set to do command
- word completion if Bash is interrupted while trying to complete a command
- word. This just resets all the completion functions to the right thing.
- It's called from throw_to_top_level(). */
-void
-bashline_reset ()
-{
- tilde_initialize ();
- rl_attempted_completion_function = attempt_shell_completion;
- rl_completion_entry_function = NULL;
- rl_ignore_some_completions_function = filename_completion_ignore;
- rl_filename_quote_characters = default_filename_quote_characters;
- set_filename_bstab (rl_filename_quote_characters);
-
- set_directory_hook ();
- rl_filename_stat_hook = bash_filename_stat_hook;
-
- bashline_reset_event_hook ();
-}
-
-/* Contains the line to push into readline. */
-static char *push_to_readline = (char *)NULL;
-
-/* Push the contents of push_to_readline into the
- readline buffer. */
-static int
-bash_push_line ()
-{
- if (push_to_readline)
- {
- rl_insert_text (push_to_readline);
- free (push_to_readline);
- push_to_readline = (char *)NULL;
- rl_startup_hook = old_rl_startup_hook;
- }
- return 0;
-}
-
-/* Call this to set the initial text for the next line to read
- from readline. */
-int
-bash_re_edit (line)
- char *line;
-{
- FREE (push_to_readline);
-
- push_to_readline = savestring (line);
- old_rl_startup_hook = rl_startup_hook;
- rl_startup_hook = bash_push_line;
-
- return (0);
-}
-
-static int
-display_shell_version (count, c)
- int count, c;
-{
- rl_crlf ();
- show_shell_version (0);
- putc ('\r', rl_outstream);
- fflush (rl_outstream);
- rl_on_new_line ();
- rl_redisplay ();
- return 0;
-}
-
-/* **************************************************************** */
-/* */
-/* Readline Stuff */
-/* */
-/* **************************************************************** */
-
-/* If the user requests hostname completion, then simply build a list
- of hosts, and complete from that forever more, or at least until
- HOSTFILE is unset. */
-
-/* THIS SHOULD BE A STRINGLIST. */
-/* The kept list of hostnames. */
-static char **hostname_list = (char **)NULL;
-
-/* The physical size of the above list. */
-static int hostname_list_size;
-
-/* The number of hostnames in the above list. */
-static int hostname_list_length;
-
-/* Whether or not HOSTNAME_LIST has been initialized. */
-int hostname_list_initialized = 0;
-
-/* Initialize the hostname completion table. */
-static void
-initialize_hostname_list ()
-{
- char *temp;
-
- temp = get_string_value ("HOSTFILE");
- if (temp == 0)
- temp = get_string_value ("hostname_completion_file");
- if (temp == 0)
- temp = DEFAULT_HOSTS_FILE;
-
- snarf_hosts_from_file (temp);
-
- if (hostname_list)
- hostname_list_initialized++;
-}
-
-/* Add NAME to the list of hosts. */
-static void
-add_host_name (name)
- char *name;
-{
- if (hostname_list_length + 2 > hostname_list_size)
- {
- hostname_list_size = (hostname_list_size + 32) - (hostname_list_size % 32);
- hostname_list = strvec_resize (hostname_list, hostname_list_size);
- }
-
- hostname_list[hostname_list_length++] = savestring (name);
- hostname_list[hostname_list_length] = (char *)NULL;
-}
-
-#define cr_whitespace(c) ((c) == '\r' || (c) == '\n' || whitespace(c))
-
-static void
-snarf_hosts_from_file (filename)
- char *filename;
-{
- FILE *file;
- char *temp, buffer[256], name[256];
- register int i, start;
-
- file = fopen (filename, "r");
- if (file == 0)
- return;
-
- while (temp = fgets (buffer, 255, file))
- {
- /* Skip to first character. */
- for (i = 0; buffer[i] && cr_whitespace (buffer[i]); i++)
- ;
-
- /* If comment or blank line, ignore. */
- if (buffer[i] == '\0' || buffer[i] == '#')
- continue;
-
- /* If `preprocessor' directive, do the include. */
- if (strncmp (buffer + i, "$include ", 9) == 0)
- {
- char *incfile, *t;
-
- /* Find start of filename. */
- for (incfile = buffer + i + 9; *incfile && whitespace (*incfile); incfile++)
- ;
-
- /* Find end of filename. */
- for (t = incfile; *t && cr_whitespace (*t) == 0; t++)
- ;
-
- *t = '\0';
-
- snarf_hosts_from_file (incfile);
- continue;
- }
-
- /* Skip internet address if present. */
- if (DIGIT (buffer[i]))
- for (; buffer[i] && cr_whitespace (buffer[i]) == 0; i++);
-
- /* Gobble up names. Each name is separated with whitespace. */
- while (buffer[i])
- {
- for (; cr_whitespace (buffer[i]); i++)
- ;
- if (buffer[i] == '\0' || buffer[i] == '#')
- break;
-
- /* Isolate the current word. */
- for (start = i; buffer[i] && cr_whitespace (buffer[i]) == 0; i++)
- ;
- if (i == start)
- continue;
- strncpy (name, buffer + start, i - start);
- name[i - start] = '\0';
- add_host_name (name);
- }
- }
- fclose (file);
-}
-
-/* Return the hostname list. */
-char **
-get_hostname_list ()
-{
- if (hostname_list_initialized == 0)
- initialize_hostname_list ();
- return (hostname_list);
-}
-
-void
-clear_hostname_list ()
-{
- register int i;
-
- if (hostname_list_initialized == 0)
- return;
- for (i = 0; i < hostname_list_length; i++)
- free (hostname_list[i]);
- hostname_list_length = hostname_list_initialized = 0;
-}
-
-/* Return a NULL terminated list of hostnames which begin with TEXT.
- Initialize the hostname list the first time if necessary.
- The array is malloc ()'ed, but not the individual strings. */
-static char **
-hostnames_matching (text)
- char *text;
-{
- register int i, len, nmatch, rsize;
- char **result;
-
- if (hostname_list_initialized == 0)
- initialize_hostname_list ();
-
- if (hostname_list_initialized == 0)
- return ((char **)NULL);
-
- /* Special case. If TEXT consists of nothing, then the whole list is
- what is desired. */
- if (*text == '\0')
- {
- result = strvec_create (1 + hostname_list_length);
- for (i = 0; i < hostname_list_length; i++)
- result[i] = hostname_list[i];
- result[i] = (char *)NULL;
- return (result);
- }
-
- /* Scan until found, or failure. */
- len = strlen (text);
- result = (char **)NULL;
- for (i = nmatch = rsize = 0; i < hostname_list_length; i++)
- {
- if (STREQN (text, hostname_list[i], len) == 0)
- continue;
-
- /* OK, it matches. Add it to the list. */
- if (nmatch >= (rsize - 1))
- {
- rsize = (rsize + 16) - (rsize % 16);
- result = strvec_resize (result, rsize);
- }
-
- result[nmatch++] = hostname_list[i];
- }
- if (nmatch)
- result[nmatch] = (char *)NULL;
- return (result);
-}
-
-/* The equivalent of the Korn shell C-o operate-and-get-next-history-line
- editing command. */
-static int saved_history_line_to_use = -1;
-static int last_saved_history_line = -1;
-
-#define HISTORY_FULL() (history_is_stifled () && history_length >= history_max_entries)
-
-static int
-set_saved_history ()
-{
- /* XXX - compensate for assumption that history was `shuffled' if it was
- actually not. */
- if (HISTORY_FULL () &&
- hist_last_line_added == 0 &&
- saved_history_line_to_use < history_length - 1)
- saved_history_line_to_use++;
-
- if (saved_history_line_to_use >= 0)
- {
- rl_get_previous_history (history_length - saved_history_line_to_use, 0);
- last_saved_history_line = saved_history_line_to_use;
- }
- saved_history_line_to_use = -1;
- rl_startup_hook = old_rl_startup_hook;
- return (0);
-}
-
-static int
-operate_and_get_next (count, c)
- int count, c;
-{
- int where;
-
- /* Accept the current line. */
- rl_newline (1, c);
-
- /* Find the current line, and find the next line to use. */
- where = where_history ();
-
- if (HISTORY_FULL () || (where >= history_length - 1))
- saved_history_line_to_use = where;
- else
- saved_history_line_to_use = where + 1;
-
- old_rl_startup_hook = rl_startup_hook;
- rl_startup_hook = set_saved_history;
-
- return 0;
-}
-
-/* This vi mode command causes VI_EDIT_COMMAND to be run on the current
- command being entered (if no explicit argument is given), otherwise on
- a command from the history file. */
-
-#define VI_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-vi}}\""
-#define EMACS_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-emacs}}\""
-#define POSIX_VI_EDIT_COMMAND "fc -e vi"
-
-static int
-edit_and_execute_command (count, c, editing_mode, edit_command)
- int count, c, editing_mode;
- char *edit_command;
-{
- char *command, *metaval;
- int r, rrs, metaflag;
- sh_parser_state_t ps;
-
- rrs = rl_readline_state;
- saved_command_line_count = current_command_line_count;
-
- /* Accept the current line. */
- rl_newline (1, c);
-
- if (rl_explicit_arg)
- {
- command = (char *)xmalloc (strlen (edit_command) + 8);
- sprintf (command, "%s %d", edit_command, count);
- }
- else
- {
- /* Take the command we were just editing, add it to the history file,
- then call fc to operate on it. We have to add a dummy command to
- the end of the history because fc ignores the last command (assumes
- it's supposed to deal with the command before the `fc'). */
- /* This breaks down when using command-oriented history and are not
- finished with the command, so we should not ignore the last command */
- using_history ();
- current_command_line_count++; /* for rl_newline above */
- bash_add_history (rl_line_buffer);
- current_command_line_count = 0; /* for dummy history entry */
- bash_add_history ("");
- history_lines_this_session++;
- using_history ();
- command = savestring (edit_command);
- }
-
- metaval = rl_variable_value ("input-meta");
- metaflag = RL_BOOLEAN_VARIABLE_VALUE (metaval);
-
- /* Now, POSIX.1-2001 and SUSv3 say that the commands executed from the
- temporary file should be placed into the history. We don't do that
- yet. */
- if (rl_deprep_term_function)
- (*rl_deprep_term_function) ();
- save_parser_state (&ps);
- r = parse_and_execute (command, (editing_mode == VI_EDITING_MODE) ? "v" : "C-xC-e", SEVAL_NOHIST);
- restore_parser_state (&ps);
- if (rl_prep_term_function)
- (*rl_prep_term_function) (metaflag);
-
- current_command_line_count = saved_command_line_count;
-
- /* Now erase the contents of the current line and undo the effects of the
- rl_accept_line() above. We don't even want to make the text we just
- executed available for undoing. */
- rl_line_buffer[0] = '\0'; /* XXX */
- rl_point = rl_end = 0;
- rl_done = 0;
- rl_readline_state = rrs;
-
- rl_forced_update_display ();
-
- return r;
-}
-
-#if defined (VI_MODE)
-static int
-vi_edit_and_execute_command (count, c)
- int count, c;
-{
- if (posixly_correct)
- return (edit_and_execute_command (count, c, VI_EDITING_MODE, POSIX_VI_EDIT_COMMAND));
- else
- return (edit_and_execute_command (count, c, VI_EDITING_MODE, VI_EDIT_COMMAND));
-}
-#endif /* VI_MODE */
-
-static int
-emacs_edit_and_execute_command (count, c)
- int count, c;
-{
- return (edit_and_execute_command (count, c, EMACS_EDITING_MODE, EMACS_EDIT_COMMAND));
-}
-
-#if defined (ALIAS)
-static int
-posix_edit_macros (count, key)
- int count, key;
-{
- int c;
- char alias_name[3], *alias_value, *macro;
-
- c = rl_read_key ();
- alias_name[0] = '_';
- alias_name[1] = c;
- alias_name[2] = '\0';
-
- alias_value = get_alias_value (alias_name);
- if (alias_value && *alias_value)
- {
- macro = savestring (alias_value);
- rl_push_macro_input (macro);
- }
- return 0;
-}
-#endif
-
-/* Bindable commands that move `shell-words': that is, sequences of
- non-unquoted-metacharacters. */
-
-#define WORDDELIM(c) (shellmeta(c) || shellblank(c))
-
-static int
-bash_forward_shellword (count, key)
- int count, key;
-{
- size_t slen;
- int sindex, c, p;
- DECLARE_MBSTATE;
-
- if (count < 0)
- return (bash_backward_shellword (-count, key));
-
- /* The tricky part of this is deciding whether or not the first character
- we're on is an unquoted metacharacter. Not completely handled yet. */
- /* XXX - need to test this stuff with backslash-escaped shell
- metacharacters and unclosed single- and double-quoted strings. */
-
- p = rl_point;
- slen = rl_end;
-
- while (count)
- {
- if (p == rl_end)
- {
- rl_point = rl_end;
- return 0;
- }
-
- /* Are we in a quoted string? If we are, move to the end of the quoted
- string and continue the outer loop. We only want quoted strings, not
- backslash-escaped characters, but char_is_quoted doesn't
- differentiate. */
- if (char_is_quoted (rl_line_buffer, p) && p > 0 && rl_line_buffer[p-1] != '\\')
- {
- do
- ADVANCE_CHAR (rl_line_buffer, slen, p);
- while (p < rl_end && char_is_quoted (rl_line_buffer, p));
- count--;
- continue;
- }
-
- /* Rest of code assumes we are not in a quoted string. */
- /* Move forward until we hit a non-metacharacter. */
- while (p < rl_end && (c = rl_line_buffer[p]) && WORDDELIM (c))
- {
- switch (c)
- {
- default:
- ADVANCE_CHAR (rl_line_buffer, slen, p);
- continue; /* straight back to loop, don't increment p */
- case '\\':
- if (p < rl_end && rl_line_buffer[p])
- ADVANCE_CHAR (rl_line_buffer, slen, p);
- break;
- case '\'':
- p = skip_to_delim (rl_line_buffer, ++p, "'", SD_NOJMP);
- break;
- case '"':
- p = skip_to_delim (rl_line_buffer, ++p, "\"", SD_NOJMP);
- break;
- }
-
- if (p < rl_end)
- p++;
- }
-
- if (rl_line_buffer[p] == 0 || p == rl_end)
- {
- rl_point = rl_end;
- rl_ding ();
- return 0;
- }
-
- /* Now move forward until we hit a non-quoted metacharacter or EOL */
- while (p < rl_end && (c = rl_line_buffer[p]) && WORDDELIM (c) == 0)
- {
- switch (c)
- {
- default:
- ADVANCE_CHAR (rl_line_buffer, slen, p);
- continue; /* straight back to loop, don't increment p */
- case '\\':
- if (p < rl_end && rl_line_buffer[p])
- ADVANCE_CHAR (rl_line_buffer, slen, p);
- break;
- case '\'':
- p = skip_to_delim (rl_line_buffer, ++p, "'", SD_NOJMP);
- break;
- case '"':
- p = skip_to_delim (rl_line_buffer, ++p, "\"", SD_NOJMP);
- break;
- }
-
- if (p < rl_end)
- p++;
- }
-
- if (p == rl_end || rl_line_buffer[p] == 0)
- {
- rl_point = rl_end;
- return (0);
- }
-
- count--;
- }
-
- rl_point = p;
- return (0);
-}
-
-static int
-bash_backward_shellword (count, key)
- int count, key;
-{
- size_t slen;
- int sindex, c, p;
- DECLARE_MBSTATE;
-
- if (count < 0)
- return (bash_forward_shellword (-count, key));
-
- p = rl_point;
- slen = rl_end;
-
- while (count)
- {
- if (p == 0)
- {
- rl_point = 0;
- return 0;
- }
-
- /* Move backward until we hit a non-metacharacter. */
- while (p > 0)
- {
- c = rl_line_buffer[p];
- if (WORDDELIM (c) && char_is_quoted (rl_line_buffer, p) == 0)
- BACKUP_CHAR (rl_line_buffer, slen, p);
- break;
- }
-
- if (p == 0)
- {
- rl_point = 0;
- return 0;
- }
-
- /* Now move backward until we hit a metacharacter or BOL. */
- while (p > 0)
- {
- c = rl_line_buffer[p];
- if (WORDDELIM (c) && char_is_quoted (rl_line_buffer, p) == 0)
- break;
- BACKUP_CHAR (rl_line_buffer, slen, p);
- }
-
- count--;
- }
-
- rl_point = p;
- return 0;
-}
-
-static int
-bash_kill_shellword (count, key)
- int count, key;
-{
- int p;
-
- if (count < 0)
- return (bash_backward_kill_shellword (-count, key));
-
- p = rl_point;
- bash_forward_shellword (count, key);
-
- if (rl_point != p)
- rl_kill_text (p, rl_point);
-
- rl_point = p;
- if (rl_editing_mode == 1) /* 1 == emacs_mode */
- rl_mark = rl_point;
-
- return 0;
-}
-
-static int
-bash_backward_kill_shellword (count, key)
- int count, key;
-{
- int p;
-
- if (count < 0)
- return (bash_kill_shellword (-count, key));
-
- p = rl_point;
- bash_backward_shellword (count, key);
-
- if (rl_point != p)
- rl_kill_text (p, rl_point);
-
- if (rl_editing_mode == 1) /* 1 == emacs_mode */
- rl_mark = rl_point;
-
- return 0;
-}
-
-
-/* **************************************************************** */
-/* */
-/* How To Do Shell Completion */
-/* */
-/* **************************************************************** */
-
-#define COMMAND_SEPARATORS ";|&{(`"
-/* )} */
-#define COMMAND_SEPARATORS_PLUS_WS ";|&{(` \t"
-/* )} */
-
-/* check for redirections and other character combinations that are not
- command separators */
-static int
-check_redir (ti)
- int ti;
-{
- register int this_char, prev_char;
-
- /* Handle the two character tokens `>&', `<&', and `>|'.
- We are not in a command position after one of these. */
- this_char = rl_line_buffer[ti];
- prev_char = rl_line_buffer[ti - 1];
-
- if ((this_char == '&' && (prev_char == '<' || prev_char == '>')) ||
- (this_char == '|' && prev_char == '>'))
- return (1);
- else if (this_char == '{' && prev_char == '$') /*}*/
- return (1);
-#if 0 /* Not yet */
- else if (this_char == '(' && prev_char == '$') /*)*/
- return (1);
- else if (this_char == '(' && prev_char == '<') /*)*/
- return (1);
-#if defined (EXTENDED_GLOB)
- else if (extended_glob && this_char == '(' && prev_char == '!') /*)*/
- return (1);
-#endif
-#endif
- else if (char_is_quoted (rl_line_buffer, ti))
- return (1);
- return (0);
-}
-
-#if defined (PROGRAMMABLE_COMPLETION)
-/*
- * XXX - because of the <= start test, and setting os = s+1, this can
- * potentially return os > start. This is probably not what we want to
- * happen, but fix later after 2.05a-release.
- */
-static int
-find_cmd_start (start)
- int start;
-{
- register int s, os, ns;
-
- os = 0;
- /* Flags == SD_NOJMP only because we want to skip over command substitutions
- in assignment statements. Have to test whether this affects `standalone'
- command substitutions as individual words. */
- while (((s = skip_to_delim (rl_line_buffer, os, COMMAND_SEPARATORS, SD_NOJMP/*|SD_NOSKIPCMD*/)) <= start) &&
- rl_line_buffer[s])
- {
- /* Handle >| token crudely; treat as > not | */
- if (rl_line_buffer[s] == '|' && rl_line_buffer[s-1] == '>')
- {
- ns = skip_to_delim (rl_line_buffer, s+1, COMMAND_SEPARATORS, SD_NOJMP/*|SD_NOSKIPCMD*/);
- if (ns > start || rl_line_buffer[ns] == 0)
- return os;
- }
- os = s+1;
- }
- return os;
-}
-
-static int
-find_cmd_end (end)
- int end;
-{
- register int e;
-
- e = skip_to_delim (rl_line_buffer, end, COMMAND_SEPARATORS, SD_NOJMP);
- return e;
-}
-
-static char *
-find_cmd_name (start, sp, ep)
- int start;
- int *sp, *ep;
-{
- char *name;
- register int s, e;
-
- for (s = start; whitespace (rl_line_buffer[s]); s++)
- ;
-
- /* skip until a shell break character */
- e = skip_to_delim (rl_line_buffer, s, "()<>;&| \t\n", SD_NOJMP);
-
- name = substring (rl_line_buffer, s, e);
-
- if (sp)
- *sp = s;
- if (ep)
- *ep = e;
-
- return (name);
-}
-
-static char *
-prog_complete_return (text, matchnum)
- const char *text;
- int matchnum;
-{
- static int ind;
-
- if (matchnum == 0)
- ind = 0;
-
- if (prog_complete_matches == 0 || prog_complete_matches[ind] == 0)
- return (char *)NULL;
- return (prog_complete_matches[ind++]);
-}
-
-#endif /* PROGRAMMABLE_COMPLETION */
-
-/* Try and catch completion attempts that are syntax errors or otherwise
- invalid. */
-static int
-invalid_completion (text, ind)
- const char *text;
- int ind;
-{
- int pind;
-
- /* If we don't catch these here, the next clause will */
- if (ind > 0 && rl_line_buffer[ind] == '(' && /*)*/
- member (rl_line_buffer[ind-1], "$<>"))
- return 0;
-
- pind = ind - 1;
- while (pind > 0 && whitespace (rl_line_buffer[pind]))
- pind--;
- /* If we have only whitespace preceding a paren, it's valid */
- if (ind >= 0 && pind <= 0 && rl_line_buffer[ind] == '(') /*)*/
- return 0;
- /* Flag the invalid completions, which are mostly syntax errors */
- if (ind > 0 && rl_line_buffer[ind] == '(' && /*)*/
- member (rl_line_buffer[pind], COMMAND_SEPARATORS) == 0)
- return 1;
-
- return 0;
-}
-
-/* Do some completion on TEXT. The indices of TEXT in RL_LINE_BUFFER are
- at START and END. Return an array of matches, or NULL if none. */
-static char **
-attempt_shell_completion (text, start, end)
- const char *text;
- int start, end;
-{
- int in_command_position, ti, saveti, qc, dflags;
- char **matches, *command_separator_chars;
-#if defined (PROGRAMMABLE_COMPLETION)
- int have_progcomps, was_assignment;
-#endif
-
- command_separator_chars = COMMAND_SEPARATORS;
- matches = (char **)NULL;
- rl_ignore_some_completions_function = filename_completion_ignore;
-
- rl_filename_quote_characters = default_filename_quote_characters;
- set_filename_bstab (rl_filename_quote_characters);
- set_directory_hook ();
- rl_filename_stat_hook = bash_filename_stat_hook;
-
- /* Determine if this could be a command word. It is if it appears at
- the start of the line (ignoring preceding whitespace), or if it
- appears after a character that separates commands. It cannot be a
- command word if we aren't at the top-level prompt. */
- ti = start - 1;
- saveti = qc = -1;
-
- while ((ti > -1) && (whitespace (rl_line_buffer[ti])))
- ti--;
-
-#if 1
- /* If this is an open quote, maybe we're trying to complete a quoted
- command name. */
- if (ti >= 0 && (rl_line_buffer[ti] == '"' || rl_line_buffer[ti] == '\''))
- {
- qc = rl_line_buffer[ti];
- saveti = ti--;
- while (ti > -1 && (whitespace (rl_line_buffer[ti])))
- ti--;
- }
-#endif
-
- in_command_position = 0;
- if (ti < 0)
- {
- /* Only do command completion at the start of a line when we
- are prompting at the top level. */
- if (current_prompt_string == ps1_prompt)
- in_command_position++;
- else if (parser_in_command_position ())
- in_command_position++;
- }
- else if (member (rl_line_buffer[ti], command_separator_chars))
- {
- in_command_position++;
-
- if (check_redir (ti) == 1)
- in_command_position = 0;
- }
- else
- {
- /* This still could be in command position. It is possible
- that all of the previous words on the line are variable
- assignments. */
- }
-
- if (in_command_position && invalid_completion (text, ti))
- {
- rl_attempted_completion_over = 1;
- return ((char **)NULL);
- }
-
- /* Check that we haven't incorrectly flagged a closed command substitution
- as indicating we're in a command position. */
- if (in_command_position && ti >= 0 && rl_line_buffer[ti] == '`' &&
- *text != '`' && unclosed_pair (rl_line_buffer, end, "`") == 0)
- in_command_position = 0;
-
- /* Special handling for command substitution. If *TEXT is a backquote,
- it can be the start or end of an old-style command substitution, or
- unmatched. If it's unmatched, both calls to unclosed_pair will
- succeed. Don't bother if readline found a single quote and we are
- completing on the substring. */
- if (*text == '`' && rl_completion_quote_character != '\'' &&
- (in_command_position || (unclosed_pair (rl_line_buffer, start, "`") &&
- unclosed_pair (rl_line_buffer, end, "`"))))
- matches = rl_completion_matches (text, command_subst_completion_function);
-
-#if defined (PROGRAMMABLE_COMPLETION)
- /* Attempt programmable completion. */
- have_progcomps = prog_completion_enabled && (progcomp_size () > 0);
- if (matches == 0 && (in_command_position == 0 || text[0] == '\0') &&
- current_prompt_string == ps1_prompt)
- {
- int s, e, s1, e1, os, foundcs;
- char *n;
-
- /* XXX - don't free the members */
- if (prog_complete_matches)
- free (prog_complete_matches);
- prog_complete_matches = (char **)NULL;
-
- os = start;
- n = 0;
- s = find_cmd_start (os);
- e = find_cmd_end (end);
- do
- {
- /* Skip over assignment statements preceding a command name. If we
- don't find a command name at all, we can perform command name
- completion. If we find a partial command name, we should perform
- command name completion on it. */
- FREE (n);
- n = find_cmd_name (s, &s1, &e1);
- s = e1 + 1;
- }
- while (was_assignment = assignment (n, 0));
- s = s1; /* reset to index where name begins */
-
- /* s == index of where command name begins (reset above)
- e == end of current command, may be end of line
- s1 = index of where command name begins
- e1 == index of where command name ends
- start == index of where word to be completed begins
- end == index of where word to be completed ends
- if (s == start) we are doing command word completion for sure
- if (e1 == end) we are at the end of the command name and completing it */
- if (start == 0 && end == 0 && e != 0 && text[0] == '\0') /* beginning of non-empty line */
- foundcs = 0;
- else if (start == end && start == s1 && e != 0 && e1 > end) /* beginning of command name, leading whitespace */
- foundcs = 0;
- else if (e == 0 && e == s && text[0] == '\0' && have_progcomps) /* beginning of empty line */
- prog_complete_matches = programmable_completions ("_EmptycmD_", text, s, e, &foundcs);
- else if (start == end && text[0] == '\0' && s1 > start && whitespace (rl_line_buffer[start]))
- foundcs = 0; /* whitespace before command name */
- else if (e > s && was_assignment == 0 && e1 == end && rl_line_buffer[e] == 0 && whitespace (rl_line_buffer[e-1]) == 0)
- {
- /* not assignment statement, but still want to perform command
- completion if we are composing command word. */
- foundcs = 0;
- in_command_position = s == start && STREQ (n, text); /* XXX */
- }
- else if (e > s && was_assignment == 0 && have_progcomps)
- {
- prog_complete_matches = programmable_completions (n, text, s, e, &foundcs);
- /* command completion if programmable completion fails */
- in_command_position = s == start && STREQ (n, text); /* XXX */
- }
- /* empty command name following command separator */
- else if (s >= e && n[0] == '\0' && text[0] == '\0' && start > 0 &&
- was_assignment == 0 && member (rl_line_buffer[start-1], COMMAND_SEPARATORS))
- {
- foundcs = 0;
- in_command_position = 1;
- }
- else if (s >= e && n[0] == '\0' && text[0] == '\0' && start > 0)
- {
- foundcs = 0; /* empty command name following assignments */
- in_command_position = was_assignment;
- }
- else if (s == start && e == end && STREQ (n, text) && start > 0)
- {
- foundcs = 0; /* partial command name following assignments */
- in_command_position = 1;
- }
- else
- foundcs = 0;
- FREE (n);
- /* XXX - if we found a COMPSPEC for the command, just return whatever
- the programmable completion code returns, and disable the default
- filename completion that readline will do unless the COPT_DEFAULT
- option has been set with the `-o default' option to complete or
- compopt. */
- if (foundcs)
- {
- pcomp_set_readline_variables (foundcs, 1);
- /* Turn what the programmable completion code returns into what
- readline wants. I should have made compute_lcd_of_matches
- external... */
- matches = rl_completion_matches (text, prog_complete_return);
- if ((foundcs & COPT_DEFAULT) == 0)
- rl_attempted_completion_over = 1; /* no default */
- if (matches || ((foundcs & COPT_BASHDEFAULT) == 0))
- return (matches);
- }
- }
-#endif
-
- if (matches == 0)
- {
- dflags = 0;
- if (in_command_position)
- dflags |= DEFCOMP_CMDPOS;
- matches = bash_default_completion (text, start, end, qc, dflags);
- }
-
- return matches;
-}
-
-char **
-bash_default_completion (text, start, end, qc, compflags)
- const char *text;
- int start, end, qc, compflags;
-{
- char **matches, *t;
-
- matches = (char **)NULL;
-
- /* New posix-style command substitution or variable name? */
- if (!matches && *text == '$')
- {
- if (qc != '\'' && text[1] == '(') /* ) */
- matches = rl_completion_matches (text, command_subst_completion_function);
- else
- {
- matches = rl_completion_matches (text, variable_completion_function);
- if (matches && matches[0] && matches[1] == 0)
- {
- t = savestring (matches[0]);
- bash_filename_stat_hook (&t);
- /* doesn't use test_for_directory because that performs tilde
- expansion */
- if (file_isdir (t))
- rl_completion_append_character = '/';
- free (t);
- }
- }
- }
-
- /* If the word starts in `~', and there is no slash in the word, then
- try completing this word as a username. */
- if (matches == 0 && *text == '~' && mbschr (text, '/') == 0)
- matches = rl_completion_matches (text, rl_username_completion_function);
-
- /* Another one. Why not? If the word starts in '@', then look through
- the world of known hostnames for completion first. */
- if (matches == 0 && perform_hostname_completion && *text == '@')
- matches = rl_completion_matches (text, hostname_completion_function);
-
- /* And last, (but not least) if this word is in a command position, then
- complete over possible command names, including aliases, functions,
- and command names. */
- if (matches == 0 && (compflags & DEFCOMP_CMDPOS))
- {
- /* If END == START and text[0] == 0, we are trying to complete an empty
- command word. */
- if (no_empty_command_completion && end == start && text[0] == '\0')
- {
- matches = (char **)NULL;
- rl_ignore_some_completions_function = bash_ignore_everything;
- }
- else
- {
-#define CMD_IS_DIR(x) (absolute_pathname(x) == 0 && absolute_program(x) == 0 && *(x) != '~' && test_for_directory (x))
-
- dot_in_path = 0;
- matches = rl_completion_matches (text, command_word_completion_function);
-
- /* If we are attempting command completion and nothing matches, we
- do not want readline to perform filename completion for us. We
- still want to be able to complete partial pathnames, so set the
- completion ignore function to something which will remove
- filenames and leave directories in the match list. */
- if (matches == (char **)NULL)
- rl_ignore_some_completions_function = bash_ignore_filenames;
- else if (matches[1] == 0 && CMD_IS_DIR(matches[0]) && dot_in_path == 0)
- /* If we found a single match, without looking in the current
- directory (because it's not in $PATH), but the found name is
- also a command in the current directory, suppress appending any
- terminating character, since it's ambiguous. */
- {
- rl_completion_suppress_append = 1;
- rl_filename_completion_desired = 0;
- }
- else if (matches[0] && matches[1] && STREQ (matches[0], matches[1]) && CMD_IS_DIR (matches[0]))
- /* There are multiple instances of the same match (duplicate
- completions haven't yet been removed). In this case, all of
- the matches will be the same, and the duplicate removal code
- will distill them all down to one. We turn on
- rl_completion_suppress_append for the same reason as above.
- Remember: we only care if there's eventually a single unique
- completion. If there are multiple completions this won't
- make a difference and the problem won't occur. */
- {
- rl_completion_suppress_append = 1;
- rl_filename_completion_desired = 0;
- }
- }
- }
-
- /* This could be a globbing pattern, so try to expand it using pathname
- expansion. */
- if (!matches && glob_pattern_p (text))
- {
- matches = rl_completion_matches (text, glob_complete_word);
- /* A glob expression that matches more than one filename is problematic.
- If we match more than one filename, punt. */
- if (matches && matches[1] && rl_completion_type == TAB)
- {
- strvec_dispose (matches);
- matches = (char **)0;
- }
- else if (matches && matches[1] && rl_completion_type == '!')
- {
- rl_completion_suppress_append = 1;
- rl_filename_completion_desired = 0;
- }
- }
-
- return (matches);
-}
-
-static int
-bash_command_name_stat_hook (name)
- char **name;
-{
- char *cname, *result;
-
- /* If it's not something we're going to look up in $PATH, just call the
- normal filename stat hook. */
- if (absolute_program (*name))
- return (bash_filename_stat_hook (name));
-
- cname = *name;
- /* XXX - we could do something here with converting aliases, builtins,
- and functions into something that came out as executable, but we don't. */
- result = search_for_command (cname, 0);
- if (result)
- {
- *name = result;
- return 1;
- }
- return 0;
-}
-
-static int
-executable_completion (filename, searching_path)
- const char *filename;
- int searching_path;
-{
- char *f;
- int r;
-
- f = savestring (filename);
- bash_directory_completion_hook (&f);
-
- r = searching_path ? executable_file (f) : executable_or_directory (f);
- free (f);
- return r;
-}
-
-/* This is the function to call when the word to complete is in a position
- where a command word can be found. It grovels $PATH, looking for commands
- that match. It also scans aliases, function names, and the shell_builtin
- table. */
-char *
-command_word_completion_function (hint_text, state)
- const char *hint_text;
- int state;
-{
- static char *hint = (char *)NULL;
- static char *path = (char *)NULL;
- static char *val = (char *)NULL;
- static char *filename_hint = (char *)NULL;
- static char *fnhint = (char *)NULL;
- static char *dequoted_hint = (char *)NULL;
- static char *directory_part = (char *)NULL;
- static char **glob_matches = (char **)NULL;
- static int path_index, hint_len, dequoted_len, istate, igncase;
- static int mapping_over, local_index, searching_path, hint_is_dir;
- static int old_glob_ignore_case, globpat;
- static SHELL_VAR **varlist = (SHELL_VAR **)NULL;
-#if defined (ALIAS)
- static alias_t **alias_list = (alias_t **)NULL;
-#endif /* ALIAS */
- char *temp, *cval;
-
- /* We have to map over the possibilities for command words. If we have
- no state, then make one just for that purpose. */
- if (state == 0)
- {
- rl_filename_stat_hook = bash_command_name_stat_hook;
-
- if (dequoted_hint && dequoted_hint != hint)
- free (dequoted_hint);
- if (hint)
- free (hint);
-
- mapping_over = searching_path = 0;
- hint_is_dir = CMD_IS_DIR (hint_text);
- val = (char *)NULL;
-
- temp = rl_variable_value ("completion-ignore-case");
- igncase = RL_BOOLEAN_VARIABLE_VALUE (temp);
-
- if (glob_matches)
- {
- free (glob_matches);
- glob_matches = (char **)NULL;
- }
-
- globpat = glob_pattern_p (hint_text);
-
- /* If this is an absolute program name, do not check it against
- aliases, reserved words, functions or builtins. We must check
- whether or not it is unique, and, if so, whether that filename
- is executable. */
- if (globpat || absolute_program (hint_text))
- {
- /* Perform tilde expansion on what's passed, so we don't end up
- passing filenames with tildes directly to stat(). */
- if (*hint_text == '~')
- {
- hint = bash_tilde_expand (hint_text, 0);
- directory_part = savestring (hint_text);
- temp = strchr (directory_part, '/');
- if (temp)
- *temp = 0;
- else
- {
- free (directory_part);
- directory_part = (char *)NULL;
- }
- }
- else
- hint = savestring (hint_text);
-
- dequoted_hint = hint;
- /* If readline's completer found a quote character somewhere, but
- didn't set the quote character, there must have been a quote
- character embedded in the filename. It can't be at the start of
- the filename, so we need to dequote the filename before we look
- in the file system for it. */
- if (rl_completion_found_quote && rl_completion_quote_character == 0)
- {
- dequoted_hint = bash_dequote_filename (hint, 0);
- free (hint);
- hint = dequoted_hint;
- }
- dequoted_len = hint_len = strlen (hint);
-
- if (filename_hint)
- free (filename_hint);
-
- fnhint = filename_hint = savestring (hint);
-
- istate = 0;
-
- if (globpat)
- {
- mapping_over = 5;
- goto globword;
- }
- else
- {
- if (dircomplete_expand && path_dot_or_dotdot (filename_hint))
- {
- dircomplete_expand = 0;
- set_directory_hook ();
- dircomplete_expand = 1;
- }
- mapping_over = 4;
- goto inner;
- }
- }
-
- dequoted_hint = hint = savestring (hint_text);
- dequoted_len = hint_len = strlen (hint);
-
- if (rl_completion_found_quote && rl_completion_quote_character == 0)
- {
- dequoted_hint = bash_dequote_filename (hint, 0);
- dequoted_len = strlen (dequoted_hint);
- }
-
- path = get_string_value ("PATH");
- path_index = dot_in_path = 0;
-
- /* Initialize the variables for each type of command word. */
- local_index = 0;
-
- if (varlist)
- free (varlist);
-
- varlist = all_visible_functions ();
-
-#if defined (ALIAS)
- if (alias_list)
- free (alias_list);
-
- alias_list = all_aliases ();
-#endif /* ALIAS */
- }
-
- /* mapping_over says what we are currently hacking. Note that every case
- in this list must fall through when there are no more possibilities. */
-
- switch (mapping_over)
- {
- case 0: /* Aliases come first. */
-#if defined (ALIAS)
- while (alias_list && alias_list[local_index])
- {
- register char *alias;
-
- alias = alias_list[local_index++]->name;
-
- if (STREQN (alias, hint, hint_len))
- return (savestring (alias));
- }
-#endif /* ALIAS */
- local_index = 0;
- mapping_over++;
-
- case 1: /* Then shell reserved words. */
- {
- while (word_token_alist[local_index].word)
- {
- register char *reserved_word;
-
- reserved_word = word_token_alist[local_index++].word;
-
- if (STREQN (reserved_word, hint, hint_len))
- return (savestring (reserved_word));
- }
- local_index = 0;
- mapping_over++;
- }
-
- case 2: /* Then function names. */
- while (varlist && varlist[local_index])
- {
- register char *varname;
-
- varname = varlist[local_index++]->name;
-
- if (STREQN (varname, hint, hint_len))
- return (savestring (varname));
- }
- local_index = 0;
- mapping_over++;
-
- case 3: /* Then shell builtins. */
- for (; local_index < num_shell_builtins; local_index++)
- {
- /* Ignore it if it doesn't have a function pointer or if it
- is not currently enabled. */
- if (!shell_builtins[local_index].function ||
- (shell_builtins[local_index].flags & BUILTIN_ENABLED) == 0)
- continue;
-
- if (STREQN (shell_builtins[local_index].name, hint, hint_len))
- {
- int i = local_index++;
-
- return (savestring (shell_builtins[i].name));
- }
- }
- local_index = 0;
- mapping_over++;
- }
-
-globword:
- /* Limited support for completing command words with globbing chars. Only
- a single match (multiple matches that end up reducing the number of
- characters in the common prefix are bad) will ever be returned on
- regular completion. */
- if (globpat)
- {
- if (state == 0)
- {
- glob_ignore_case = igncase;
- glob_matches = shell_glob_filename (hint);
- glob_ignore_case = old_glob_ignore_case;
-
- if (GLOB_FAILED (glob_matches) || glob_matches == 0)
- {
- glob_matches = (char **)NULL;
- return ((char *)NULL);
- }
-
- local_index = 0;
-
- if (glob_matches[1] && rl_completion_type == TAB) /* multiple matches are bad */
- return ((char *)NULL);
- }
-
- while (val = glob_matches[local_index++])
- {
- if (executable_or_directory (val))
- {
- if (*hint_text == '~' && directory_part)
- {
- temp = maybe_restore_tilde (val, directory_part);
- free (val);
- val = temp;
- }
- return (val);
- }
- free (val);
- }
-
- glob_ignore_case = old_glob_ignore_case;
- return ((char *)NULL);
- }
-
- /* If the text passed is a directory in the current directory, return it
- as a possible match. Executables in directories in the current
- directory can be specified using relative pathnames and successfully
- executed even when `.' is not in $PATH. */
- if (hint_is_dir)
- {
- hint_is_dir = 0; /* only return the hint text once */
- return (savestring (hint_text));
- }
-
- /* Repeatedly call filename_completion_function while we have
- members of PATH left. Question: should we stat each file?
- Answer: we call executable_file () on each file. */
- outer:
-
- istate = (val != (char *)NULL);
-
- if (istate == 0)
- {
- char *current_path;
-
- /* Get the next directory from the path. If there is none, then we
- are all done. */
- if (path == 0 || path[path_index] == 0 ||
- (current_path = extract_colon_unit (path, &path_index)) == 0)
- return ((char *)NULL);
-
- searching_path = 1;
- if (*current_path == 0)
- {
- free (current_path);
- current_path = savestring (".");
- }
-
- if (*current_path == '~')
- {
- char *t;
-
- t = bash_tilde_expand (current_path, 0);
- free (current_path);
- current_path = t;
- }
-
- if (current_path[0] == '.' && current_path[1] == '\0')
- dot_in_path = 1;
-
- if (fnhint && fnhint != filename_hint)
- free (fnhint);
- if (filename_hint)
- free (filename_hint);
-
- filename_hint = sh_makepath (current_path, hint, 0);
- /* Need a quoted version (though it doesn't matter much in most
- cases) because rl_filename_completion_function dequotes the
- filename it gets, assuming that it's been quoted as part of
- the input line buffer. */
- if (strpbrk (filename_hint, "\"'\\"))
- fnhint = sh_backslash_quote (filename_hint, filename_bstab, 0);
- else
- fnhint = filename_hint;
- free (current_path); /* XXX */
- }
-
- inner:
- val = rl_filename_completion_function (fnhint, istate);
- if (mapping_over == 4 && dircomplete_expand)
- set_directory_hook ();
-
- istate = 1;
-
- if (val == 0)
- {
- /* If the hint text is an absolute program, then don't bother
- searching through PATH. */
- if (absolute_program (hint))
- return ((char *)NULL);
-
- goto outer;
- }
- else
- {
- int match, freetemp;
-
- if (absolute_program (hint))
- {
- if (igncase == 0)
- match = strncmp (val, hint, hint_len) == 0;
- else
- match = strncasecmp (val, hint, hint_len) == 0;
-
- /* If we performed tilde expansion, restore the original
- filename. */
- if (*hint_text == '~')
- temp = maybe_restore_tilde (val, directory_part);
- else
- temp = savestring (val);
- freetemp = 1;
- }
- else
- {
- temp = strrchr (val, '/');
-
- if (temp)
- {
- temp++;
- if (igncase == 0)
- freetemp = match = strncmp (temp, hint, hint_len) == 0;
- else
- freetemp = match = strncasecmp (temp, hint, hint_len) == 0;
- if (match)
- temp = savestring (temp);
- }
- else
- freetemp = match = 0;
- }
-
- /* If we have found a match, and it is an executable file, return it.
- We don't return directory names when searching $PATH, since the
- bash execution code won't find executables in directories which
- appear in directories in $PATH when they're specified using
- relative pathnames. */
-#if 0
- /* If we're not searching $PATH and we have a relative pathname, we
- need to re-canonicalize it before testing whether or not it's an
- executable or a directory so the shell treats .. relative to $PWD
- according to the physical/logical option. The shell already
- canonicalizes the directory name in order to tell readline where
- to look, so not doing it here will be inconsistent. */
- /* XXX -- currently not used -- will introduce more inconsistency,
- since shell does not canonicalize ../foo before passing it to
- shell_execve(). */
- if (match && searching_path == 0 && *val == '.')
- {
- char *t, *t1;
-
- t = get_working_directory ("command-word-completion");
- t1 = make_absolute (val, t);
- free (t);
- cval = sh_canonpath (t1, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
- }
- else
-#endif
- cval = val;
-
- if (match && executable_completion ((searching_path ? val : cval), searching_path))
- {
- if (cval != val)
- free (cval);
- free (val);
- val = ""; /* So it won't be NULL. */
- return (temp);
- }
- else
- {
- if (freetemp)
- free (temp);
- if (cval != val)
- free (cval);
- free (val);
- goto inner;
- }
- }
-}
-
-/* Completion inside an unterminated command substitution. */
-static char *
-command_subst_completion_function (text, state)
- const char *text;
- int state;
-{
- static char **matches = (char **)NULL;
- static const char *orig_start;
- static char *filename_text = (char *)NULL;
- static int cmd_index, start_len;
- char *value;
-
- if (state == 0)
- {
- if (filename_text)
- free (filename_text);
- orig_start = text;
- if (*text == '`')
- text++;
- else if (*text == '$' && text[1] == '(') /* ) */
- text += 2;
- /* If the text was quoted, suppress any quote character that the
- readline completion code would insert. */
- rl_completion_suppress_quote = 1;
- start_len = text - orig_start;
- filename_text = savestring (text);
- if (matches)
- free (matches);
-
- /*
- * At this point we can entertain the idea of re-parsing
- * `filename_text' into a (possibly incomplete) command name and
- * arguments, and doing completion based on that. This is
- * currently very rudimentary, but it is a small improvement.
- */
- for (value = filename_text + strlen (filename_text) - 1; value > filename_text; value--)
- if (whitespace (*value) || member (*value, COMMAND_SEPARATORS))
- break;
- if (value <= filename_text)
- matches = rl_completion_matches (filename_text, command_word_completion_function);
- else
- {
- value++;
- start_len += value - filename_text;
- if (whitespace (value[-1]))
- matches = rl_completion_matches (value, rl_filename_completion_function);
- else
- matches = rl_completion_matches (value, command_word_completion_function);
- }
-
- /* If there is more than one match, rl_completion_matches has already
- put the lcd in matches[0]. Skip over it. */
- cmd_index = matches && matches[0] && matches[1];
-
- /* If there's a single match and it's a directory, set the append char
- to the expected `/'. Otherwise, don't append anything. */
- if (matches && matches[0] && matches[1] == 0 && test_for_directory (matches[0]))
- rl_completion_append_character = '/';
- else
- rl_completion_suppress_append = 1;
- }
-
- if (matches == 0 || matches[cmd_index] == 0)
- {
- rl_filename_quoting_desired = 0; /* disable quoting */
- return ((char *)NULL);
- }
- else
- {
- value = (char *)xmalloc (1 + start_len + strlen (matches[cmd_index]));
-
- if (start_len == 1)
- value[0] = *orig_start;
- else
- strncpy (value, orig_start, start_len);
-
- strcpy (value + start_len, matches[cmd_index]);
-
- cmd_index++;
- return (value);
- }
-}
-
-/* Okay, now we write the entry_function for variable completion. */
-static char *
-variable_completion_function (text, state)
- const char *text;
- int state;
-{
- static char **varlist = (char **)NULL;
- static int varlist_index;
- static char *varname = (char *)NULL;
- static int namelen;
- static int first_char, first_char_loc;
-
- if (!state)
- {
- if (varname)
- free (varname);
-
- first_char_loc = 0;
- first_char = text[0];
-
- if (first_char == '$')
- first_char_loc++;
-
- if (text[first_char_loc] == '{')
- first_char_loc++;
-
- varname = savestring (text + first_char_loc);
-
- namelen = strlen (varname);
- if (varlist)
- strvec_dispose (varlist);
-
- varlist = all_variables_matching_prefix (varname);
- varlist_index = 0;
- }
-
- if (!varlist || !varlist[varlist_index])
- {
- return ((char *)NULL);
- }
- else
- {
- char *value;
-
- value = (char *)xmalloc (4 + strlen (varlist[varlist_index]));
-
- if (first_char_loc)
- {
- value[0] = first_char;
- if (first_char_loc == 2)
- value[1] = '{';
- }
-
- strcpy (value + first_char_loc, varlist[varlist_index]);
- if (first_char_loc == 2)
- strcat (value, "}");
-
- varlist_index++;
- return (value);
- }
-}
-
-/* How about a completion function for hostnames? */
-static char *
-hostname_completion_function (text, state)
- const char *text;
- int state;
-{
- static char **list = (char **)NULL;
- static int list_index = 0;
- static int first_char, first_char_loc;
-
- /* If we don't have any state, make some. */
- if (state == 0)
- {
- FREE (list);
-
- list = (char **)NULL;
-
- first_char_loc = 0;
- first_char = *text;
-
- if (first_char == '@')
- first_char_loc++;
-
- list = hostnames_matching ((char *)text+first_char_loc);
- list_index = 0;
- }
-
- if (list && list[list_index])
- {
- char *t;
-
- t = (char *)xmalloc (2 + strlen (list[list_index]));
- *t = first_char;
- strcpy (t + first_char_loc, list[list_index]);
- list_index++;
- return (t);
- }
-
- return ((char *)NULL);
-}
-
-/*
- * A completion function for service names from /etc/services (or wherever).
- */
-char *
-bash_servicename_completion_function (text, state)
- const char *text;
- int state;
-{
-#if defined (__WIN32__) || defined (__OPENNT) || !defined (HAVE_GETSERVENT)
- return ((char *)NULL);
-#else
- static char *sname = (char *)NULL;
- static struct servent *srvent;
- static int snamelen, firstc;
- char *value;
- char **alist, *aentry;
- int afound;
-
- if (state == 0)
- {
- FREE (sname);
- firstc = *text;
-
- sname = savestring (text);
- snamelen = strlen (sname);
- setservent (0);
- }
-
- while (srvent = getservent ())
- {
- afound = 0;
- if (snamelen == 0 || (STREQN (sname, srvent->s_name, snamelen)))
- break;
- /* Not primary, check aliases */
- for (alist = srvent->s_aliases; *alist; alist++)
- {
- aentry = *alist;
- if (STREQN (sname, aentry, snamelen))
- {
- afound = 1;
- break;
- }
- }
-
- if (afound)
- break;
- }
-
- if (srvent == 0)
- {
- endservent ();
- return ((char *)NULL);
- }
-
- value = afound ? savestring (aentry) : savestring (srvent->s_name);
- return value;
-#endif
-}
-
-/*
- * A completion function for group names from /etc/group (or wherever).
- */
-char *
-bash_groupname_completion_function (text, state)
- const char *text;
- int state;
-{
-#if defined (__WIN32__) || defined (__OPENNT) || !defined (HAVE_GRP_H)
- return ((char *)NULL);
-#else
- static char *gname = (char *)NULL;
- static struct group *grent;
- static int gnamelen;
- char *value;
-
- if (state == 0)
- {
- FREE (gname);
- gname = savestring (text);
- gnamelen = strlen (gname);
-
- setgrent ();
- }
-
- while (grent = getgrent ())
- {
- if (gnamelen == 0 || (STREQN (gname, grent->gr_name, gnamelen)))
- break;
- }
-
- if (grent == 0)
- {
- endgrent ();
- return ((char *)NULL);
- }
-
- value = savestring (grent->gr_name);
- return (value);
-#endif
-}
-
-/* Functions to perform history and alias expansions on the current line. */
-
-#if defined (BANG_HISTORY)
-/* Perform history expansion on the current line. If no history expansion
- is done, pre_process_line() returns what it was passed, so we need to
- allocate a new line here. */
-static char *
-history_expand_line_internal (line)
- char *line;
-{
- char *new_line;
- int old_verify;
-
- old_verify = hist_verify;
- hist_verify = 0;
- new_line = pre_process_line (line, 0, 0);
- hist_verify = old_verify;
-
- return (new_line == line) ? savestring (line) : new_line;
-}
-#endif
-
-/* There was an error in expansion. Let the preprocessor print
- the error here. */
-static void
-cleanup_expansion_error ()
-{
- char *to_free;
-#if defined (BANG_HISTORY)
- int old_verify;
-
- old_verify = hist_verify;
- hist_verify = 0;
-#endif
-
- fprintf (rl_outstream, "\r\n");
- to_free = pre_process_line (rl_line_buffer, 1, 0);
-#if defined (BANG_HISTORY)
- hist_verify = old_verify;
-#endif
- if (to_free != rl_line_buffer)
- FREE (to_free);
- putc ('\r', rl_outstream);
- rl_forced_update_display ();
-}
-
-/* If NEW_LINE differs from what is in the readline line buffer, add an
- undo record to get from the readline line buffer contents to the new
- line and make NEW_LINE the current readline line. */
-static void
-maybe_make_readline_line (new_line)
- char *new_line;
-{
- if (strcmp (new_line, rl_line_buffer) != 0)
- {
- rl_point = rl_end;
-
- rl_add_undo (UNDO_BEGIN, 0, 0, 0);
- rl_delete_text (0, rl_point);
- rl_point = rl_end = rl_mark = 0;
- rl_insert_text (new_line);
- rl_add_undo (UNDO_END, 0, 0, 0);
- }
-}
-
-/* Make NEW_LINE be the current readline line. This frees NEW_LINE. */
-static void
-set_up_new_line (new_line)
- char *new_line;
-{
- int old_point, at_end;
-
- old_point = rl_point;
- at_end = rl_point == rl_end;
-
- /* If the line was history and alias expanded, then make that
- be one thing to undo. */
- maybe_make_readline_line (new_line);
- free (new_line);
-
- /* Place rl_point where we think it should go. */
- if (at_end)
- rl_point = rl_end;
- else if (old_point < rl_end)
- {
- rl_point = old_point;
- if (!whitespace (rl_line_buffer[rl_point]))
- rl_forward_word (1, 0);
- }
-}
-
-#if defined (ALIAS)
-/* Expand aliases in the current readline line. */
-static int
-alias_expand_line (count, ignore)
- int count, ignore;
-{
- char *new_line;
-
- new_line = alias_expand (rl_line_buffer);
-
- if (new_line)
- {
- set_up_new_line (new_line);
- return (0);
- }
- else
- {
- cleanup_expansion_error ();
- return (1);
- }
-}
-#endif
-
-#if defined (BANG_HISTORY)
-/* History expand the line. */
-static int
-history_expand_line (count, ignore)
- int count, ignore;
-{
- char *new_line;
-
- new_line = history_expand_line_internal (rl_line_buffer);
-
- if (new_line)
- {
- set_up_new_line (new_line);
- return (0);
- }
- else
- {
- cleanup_expansion_error ();
- return (1);
- }
-}
-
-/* Expand history substitutions in the current line and then insert a
- space (hopefully close to where we were before). */
-static int
-tcsh_magic_space (count, ignore)
- int count, ignore;
-{
- int dist_from_end, old_point;
-
- old_point = rl_point;
- dist_from_end = rl_end - rl_point;
- if (history_expand_line (count, ignore) == 0)
- {
- /* Try a simple heuristic from Stephen Gildea <gildea@intouchsys.com>.
- This works if all expansions were before rl_point or if no expansions
- were performed. */
- rl_point = (old_point == 0) ? old_point : rl_end - dist_from_end;
- rl_insert (1, ' ');
- return (0);
- }
- else
- return (1);
-}
-#endif /* BANG_HISTORY */
-
-/* History and alias expand the line. */
-static int
-history_and_alias_expand_line (count, ignore)
- int count, ignore;
-{
- char *new_line;
-
- new_line = 0;
-#if defined (BANG_HISTORY)
- new_line = history_expand_line_internal (rl_line_buffer);
-#endif
-
-#if defined (ALIAS)
- if (new_line)
- {
- char *alias_line;
-
- alias_line = alias_expand (new_line);
- free (new_line);
- new_line = alias_line;
- }
-#endif /* ALIAS */
-
- if (new_line)
- {
- set_up_new_line (new_line);
- return (0);
- }
- else
- {
- cleanup_expansion_error ();
- return (1);
- }
-}
-
-/* History and alias expand the line, then perform the shell word
- expansions by calling expand_string. This can't use set_up_new_line()
- because we want the variable expansions as a separate undo'able
- set of operations. */
-static int
-shell_expand_line (count, ignore)
- int count, ignore;
-{
- char *new_line;
- WORD_LIST *expanded_string;
-
- new_line = 0;
-#if defined (BANG_HISTORY)
- new_line = history_expand_line_internal (rl_line_buffer);
-#endif
-
-#if defined (ALIAS)
- if (new_line)
- {
- char *alias_line;
-
- alias_line = alias_expand (new_line);
- free (new_line);
- new_line = alias_line;
- }
-#endif /* ALIAS */
-
- if (new_line)
- {
- int old_point = rl_point;
- int at_end = rl_point == rl_end;
-
- /* If the line was history and alias expanded, then make that
- be one thing to undo. */
- maybe_make_readline_line (new_line);
- free (new_line);
-
- /* If there is variable expansion to perform, do that as a separate
- operation to be undone. */
- new_line = savestring (rl_line_buffer);
- expanded_string = expand_string (new_line, 0);
- FREE (new_line);
- if (expanded_string == 0)
- {
- new_line = (char *)xmalloc (1);
- new_line[0] = '\0';
- }
- else
- {
- new_line = string_list (expanded_string);
- dispose_words (expanded_string);
- }
-
- maybe_make_readline_line (new_line);
- free (new_line);
-
- /* Place rl_point where we think it should go. */
- if (at_end)
- rl_point = rl_end;
- else if (old_point < rl_end)
- {
- rl_point = old_point;
- if (!whitespace (rl_line_buffer[rl_point]))
- rl_forward_word (1, 0);
- }
- return 0;
- }
- else
- {
- cleanup_expansion_error ();
- return 1;
- }
-}
-
-/* If FIGNORE is set, then don't match files with the given suffixes when
- completing filenames. If only one of the possibilities has an acceptable
- suffix, delete the others, else just return and let the completer
- signal an error. It is called by the completer when real
- completions are done on filenames by the completer's internal
- function, not for completion lists (M-?) and not on "other"
- completion types, such as hostnames or commands. */
-
-static struct ignorevar fignore =
-{
- "FIGNORE",
- (struct ign *)0,
- 0,
- (char *)0,
- (sh_iv_item_func_t *) 0,
-};
-
-static void
-_ignore_completion_names (names, name_func)
- char **names;
- sh_ignore_func_t *name_func;
-{
- char **newnames;
- int idx, nidx;
- char **oldnames;
- int oidx;
-
- /* If there is only one completion, see if it is acceptable. If it is
- not, free it up. In any case, short-circuit and return. This is a
- special case because names[0] is not the prefix of the list of names
- if there is only one completion; it is the completion itself. */
- if (names[1] == (char *)0)
- {
- if (force_fignore)
- if ((*name_func) (names[0]) == 0)
- {
- free (names[0]);
- names[0] = (char *)NULL;
- }
-
- return;
- }
-
- /* Allocate space for array to hold list of pointers to matching
- filenames. The pointers are copied back to NAMES when done. */
- for (nidx = 1; names[nidx]; nidx++)
- ;
- newnames = strvec_create (nidx + 1);
-
- if (force_fignore == 0)
- {
- oldnames = strvec_create (nidx - 1);
- oidx = 0;
- }
-
- newnames[0] = names[0];
- for (idx = nidx = 1; names[idx]; idx++)
- {
- if ((*name_func) (names[idx]))
- newnames[nidx++] = names[idx];
- else if (force_fignore == 0)
- oldnames[oidx++] = names[idx];
- else
- free (names[idx]);
- }
-
- newnames[nidx] = (char *)NULL;
-
- /* If none are acceptable then let the completer handle it. */
- if (nidx == 1)
- {
- if (force_fignore)
- {
- free (names[0]);
- names[0] = (char *)NULL;
- }
- else
- free (oldnames);
-
- free (newnames);
- return;
- }
-
- if (force_fignore == 0)
- {
- while (oidx)
- free (oldnames[--oidx]);
- free (oldnames);
- }
-
- /* If only one is acceptable, copy it to names[0] and return. */
- if (nidx == 2)
- {
- free (names[0]);
- names[0] = newnames[1];
- names[1] = (char *)NULL;
- free (newnames);
- return;
- }
-
- /* Copy the acceptable names back to NAMES, set the new array end,
- and return. */
- for (nidx = 1; newnames[nidx]; nidx++)
- names[nidx] = newnames[nidx];
- names[nidx] = (char *)NULL;
- free (newnames);
-}
-
-static int
-name_is_acceptable (name)
- const char *name;
-{
- struct ign *p;
- int nlen;
-
- for (nlen = strlen (name), p = fignore.ignores; p->val; p++)
- {
- if (nlen > p->len && p->len > 0 && STREQ (p->val, &name[nlen - p->len]))
- return (0);
- }
-
- return (1);
-}
-
-#if 0
-static int
-ignore_dot_names (name)
- char *name;
-{
- return (name[0] != '.');
-}
-#endif
-
-static int
-filename_completion_ignore (names)
- char **names;
-{
-#if 0
- if (glob_dot_filenames == 0)
- _ignore_completion_names (names, ignore_dot_names);
-#endif
-
- setup_ignore_patterns (&fignore);
-
- if (fignore.num_ignores == 0)
- return 0;
-
- _ignore_completion_names (names, name_is_acceptable);
-
- return 0;
-}
-
-/* Return 1 if NAME is a directory. NAME undergoes tilde expansion. */
-static int
-test_for_directory (name)
- const char *name;
-{
- char *fn;
- int r;
-
- fn = bash_tilde_expand (name, 0);
- r = file_isdir (fn);
- free (fn);
-
- return (r);
-}
-
-/* Remove files from NAMES, leaving directories. */
-static int
-bash_ignore_filenames (names)
- char **names;
-{
- _ignore_completion_names (names, test_for_directory);
- return 0;
-}
-
-static int
-return_zero (name)
- const char *name;
-{
- return 0;
-}
-
-static int
-bash_ignore_everything (names)
- char **names;
-{
- _ignore_completion_names (names, return_zero);
- return 0;
-}
-
-/* Replace a tilde-prefix in VAL with a `~', assuming the user typed it. VAL
- is an expanded filename. DIRECTORY_PART is the tilde-prefix portion
- of the un-tilde-expanded version of VAL (what the user typed). */
-static char *
-restore_tilde (val, directory_part)
- char *val, *directory_part;
-{
- int l, vl, dl2, xl;
- char *dh2, *expdir, *ret;
-
- vl = strlen (val);
-
- /* We need to duplicate the expansions readline performs on the directory
- portion before passing it to our completion function. */
- dh2 = directory_part ? bash_dequote_filename (directory_part, 0) : 0;
- bash_directory_expansion (&dh2);
- dl2 = strlen (dh2);
-
- expdir = bash_tilde_expand (directory_part, 0);
- xl = strlen (expdir);
- free (expdir);
-
- /*
- dh2 = unexpanded but dequoted tilde-prefix
- dl2 = length of tilde-prefix
- expdir = tilde-expanded tilde-prefix
- xl = length of expanded tilde-prefix
- l = length of remainder after tilde-prefix
- */
- l = (vl - xl) + 1;
-
- ret = (char *)xmalloc (dl2 + 2 + l);
- strcpy (ret, dh2);
- strcpy (ret + dl2, val + xl);
-
- free (dh2);
- return (ret);
-}
-
-static char *
-maybe_restore_tilde (val, directory_part)
- char *val, *directory_part;
-{
- rl_icppfunc_t *save;
- char *ret;
-
- save = (dircomplete_expand == 0) ? save_directory_hook () : (rl_icppfunc_t *)0;
- ret = restore_tilde (val, directory_part);
- if (save)
- restore_directory_hook (save);
- return ret;
-}
-
-/* Simulate the expansions that will be performed by
- rl_filename_completion_function. This must be called with the address of
- a pointer to malloc'd memory. */
-static void
-bash_directory_expansion (dirname)
- char **dirname;
-{
- char *d, *nd;
-
- d = savestring (*dirname);
-
- if ((rl_directory_rewrite_hook) && (*rl_directory_rewrite_hook) (&d))
- {
- free (*dirname);
- *dirname = d;
- }
- else if (rl_directory_completion_hook && (*rl_directory_completion_hook) (&d))
- {
- free (*dirname);
- *dirname = d;
- }
- else if (rl_completion_found_quote)
- {
- nd = bash_dequote_filename (d, rl_completion_quote_character);
- free (*dirname);
- free (d);
- *dirname = nd;
- }
-}
-
-/* If necessary, rewrite directory entry */
-static char *
-bash_filename_rewrite_hook (fname, fnlen)
- char *fname;
- int fnlen;
-{
- char *conv;
-
- conv = fnx_fromfs (fname, fnlen);
- if (conv != fname)
- conv = savestring (conv);
- return conv;
-}
-
-/* Functions to save and restore the appropriate directory hook */
-/* This is not static so the shopt code can call it */
-void
-set_directory_hook ()
-{
- if (dircomplete_expand)
- {
- rl_directory_completion_hook = bash_directory_completion_hook;
- rl_directory_rewrite_hook = (rl_icppfunc_t *)0;
- }
- else
- {
- rl_directory_rewrite_hook = bash_directory_completion_hook;
- rl_directory_completion_hook = (rl_icppfunc_t *)0;
- }
-}
-
-static rl_icppfunc_t *
-save_directory_hook ()
-{
- rl_icppfunc_t *ret;
-
- if (dircomplete_expand)
- {
- ret = rl_directory_completion_hook;
- rl_directory_completion_hook = (rl_icppfunc_t *)NULL;
- }
- else
- {
- ret = rl_directory_rewrite_hook;
- rl_directory_rewrite_hook = (rl_icppfunc_t *)NULL;
- }
-
- return ret;
-}
-
-static void
-restore_directory_hook (hookf)
- rl_icppfunc_t *hookf;
-{
- if (dircomplete_expand)
- rl_directory_completion_hook = hookf;
- else
- rl_directory_rewrite_hook = hookf;
-}
-
-/* Expand a filename before the readline completion code passes it to stat(2).
- The filename will already have had tilde expansion performed. */
-static int
-bash_filename_stat_hook (dirname)
- char **dirname;
-{
- char *local_dirname, *new_dirname, *t;
- int should_expand_dirname, return_value;
- WORD_LIST *wl;
- struct stat sb;
-
- local_dirname = *dirname;
- should_expand_dirname = return_value = 0;
- if (t = mbschr (local_dirname, '$'))
- should_expand_dirname = '$';
- else if (t = mbschr (local_dirname, '`')) /* XXX */
- should_expand_dirname = '`';
-
-#if defined (HAVE_LSTAT)
- if (should_expand_dirname && lstat (local_dirname, &sb) == 0)
-#else
- if (should_expand_dirname && stat (local_dirname, &sb) == 0)
-#endif
- should_expand_dirname = 0;
-
- if (should_expand_dirname)
- {
- new_dirname = savestring (local_dirname);
- wl = expand_prompt_string (new_dirname, 0, W_NOCOMSUB); /* does the right thing */
- if (wl)
- {
- free (new_dirname);
- new_dirname = string_list (wl);
- /* Tell the completer we actually expanded something and change
- *dirname only if we expanded to something non-null -- stat
- behaves unpredictably when passed null or empty strings */
- if (new_dirname && *new_dirname)
- {
- free (local_dirname); /* XXX */
- local_dirname = *dirname = new_dirname;
- return_value = STREQ (local_dirname, *dirname) == 0;
- }
- else
- free (new_dirname);
- dispose_words (wl);
- }
- else
- free (new_dirname);
- }
-
- /* This is very similar to the code in bash_directory_completion_hook below,
- but without spelling correction and not worrying about whether or not
- we change relative pathnames. */
- if (no_symbolic_links == 0 && (local_dirname[0] != '.' || local_dirname[1]))
- {
- char *temp1, *temp2;
-
- t = get_working_directory ("symlink-hook");
- temp1 = make_absolute (local_dirname, t);
- free (t);
- temp2 = sh_canonpath (temp1, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
-
- /* If we can't canonicalize, bail. */
- if (temp2 == 0)
- {
- free (temp1);
- return return_value;
- }
-
- free (local_dirname);
- *dirname = temp2;
- free (temp1);
- }
-
- return (return_value);
-}
-
-/* Handle symbolic link references and other directory name
- expansions while hacking completion. This should return 1 if it modifies
- the DIRNAME argument, 0 otherwise. It should make sure not to modify
- DIRNAME if it returns 0. */
-static int
-bash_directory_completion_hook (dirname)
- char **dirname;
-{
- char *local_dirname, *new_dirname, *t;
- int return_value, should_expand_dirname, nextch, closer;
- WORD_LIST *wl;
- struct stat sb;
-
- return_value = should_expand_dirname = nextch = closer = 0;
- local_dirname = *dirname;
-
- if (t = mbschr (local_dirname, '$'))
- {
- should_expand_dirname = '$';
- nextch = t[1];
- /* Deliberately does not handle the deprecated $[...] arithmetic
- expansion syntax */
- if (nextch == '(')
- closer = ')';
- else if (nextch == '{')
- closer = '}';
- else
- nextch = 0;
- }
- else if (local_dirname[0] == '~')
- should_expand_dirname = '~';
- else
- {
- t = mbschr (local_dirname, '`');
- if (t && unclosed_pair (local_dirname, strlen (local_dirname), "`") == 0)
- should_expand_dirname = '`';
- }
-
-#if defined (HAVE_LSTAT)
- if (should_expand_dirname && lstat (local_dirname, &sb) == 0)
-#else
- if (should_expand_dirname && stat (local_dirname, &sb) == 0)
-#endif
- should_expand_dirname = 0;
-
- if (should_expand_dirname)
- {
- new_dirname = savestring (local_dirname);
- wl = expand_prompt_string (new_dirname, 0, W_NOCOMSUB); /* does the right thing */
- if (wl)
- {
- *dirname = string_list (wl);
- /* Tell the completer to replace the directory name only if we
- actually expanded something. */
- return_value = STREQ (local_dirname, *dirname) == 0;
- free (local_dirname);
- free (new_dirname);
- dispose_words (wl);
- local_dirname = *dirname;
- /* XXX - change rl_filename_quote_characters here based on
- should_expand_dirname/nextch/closer. This is the only place
- custom_filename_quote_characters is modified. */
- if (rl_filename_quote_characters && *rl_filename_quote_characters)
- {
- int i, j, c;
- i = strlen (default_filename_quote_characters);
- custom_filename_quote_characters = xrealloc (custom_filename_quote_characters, i+1);
- for (i = j = 0; c = default_filename_quote_characters[i]; i++)
- {
- if (c == should_expand_dirname || c == nextch || c == closer)
- continue;
- custom_filename_quote_characters[j++] = c;
- }
- custom_filename_quote_characters[j] = '\0';
- rl_filename_quote_characters = custom_filename_quote_characters;
- set_filename_bstab (rl_filename_quote_characters);
- }
- }
- else
- {
- free (new_dirname);
- free (local_dirname);
- *dirname = (char *)xmalloc (1);
- **dirname = '\0';
- return 1;
- }
- }
- else
- {
- /* Dequote the filename even if we don't expand it. */
- new_dirname = bash_dequote_filename (local_dirname, rl_completion_quote_character);
- return_value = STREQ (local_dirname, new_dirname) == 0;
- free (local_dirname);
- local_dirname = *dirname = new_dirname;
- }
-
- /* no_symbolic_links == 0 -> use (default) logical view of the file system.
- local_dirname[0] == '.' && local_dirname[1] == '/' means files in the
- current directory (./).
- local_dirname[0] == '.' && local_dirname[1] == 0 means relative pathnames
- in the current directory (e.g., lib/sh).
- XXX - should we do spelling correction on these? */
-
- /* This is test as it was in bash-4.2: skip relative pathnames in current
- directory. Change test to
- (local_dirname[0] != '.' || (local_dirname[1] && local_dirname[1] != '/'))
- if we want to skip paths beginning with ./ also. */
- if (no_symbolic_links == 0 && (local_dirname[0] != '.' || local_dirname[1]))
- {
- char *temp1, *temp2;
- int len1, len2;
-
- /* If we have a relative path
- (local_dirname[0] != '/' && local_dirname[0] != '.')
- that is canonical after appending it to the current directory, then
- temp1 = temp2+'/'
- That is,
- strcmp (temp1, temp2) == 0
- after adding a slash to temp2 below. It should be safe to not
- change those.
- */
- t = get_working_directory ("symlink-hook");
- temp1 = make_absolute (local_dirname, t);
- free (t);
- temp2 = sh_canonpath (temp1, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
-
- /* Try spelling correction if initial canonicalization fails. Make
- sure we are set to replace the directory name with the results so
- subsequent directory checks don't fail. */
- if (temp2 == 0 && dircomplete_spelling && dircomplete_expand)
- {
- temp2 = dirspell (temp1);
- if (temp2)
- {
- free (temp1);
- temp1 = temp2;
- temp2 = sh_canonpath (temp1, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
- return_value |= temp2 != 0;
- }
- }
- /* If we can't canonicalize, bail. */
- if (temp2 == 0)
- {
- free (temp1);
- return return_value;
- }
- len1 = strlen (temp1);
- if (temp1[len1 - 1] == '/')
- {
- len2 = strlen (temp2);
- if (len2 > 2) /* don't append `/' to `/' or `//' */
- {
- temp2 = (char *)xrealloc (temp2, len2 + 2);
- temp2[len2] = '/';
- temp2[len2 + 1] = '\0';
- }
- }
-
- /* dircomplete_expand_relpath == 0 means we want to leave relative
- pathnames that are unchanged by canonicalization alone.
- *local_dirname != '/' && *local_dirname != '.' == relative pathname
- (consistent with general.c:absolute_pathname())
- temp1 == temp2 (after appending a slash to temp2) means the pathname
- is not changed by canonicalization as described above. */
- if (dircomplete_expand_relpath || ((local_dirname[0] != '/' && local_dirname[0] != '.') && STREQ (temp1, temp2) == 0))
- return_value |= STREQ (local_dirname, temp2) == 0;
- free (local_dirname);
- *dirname = temp2;
- free (temp1);
- }
-
- return (return_value);
-}
-
-static char **history_completion_array = (char **)NULL;
-static int harry_size;
-static int harry_len;
-
-static void
-build_history_completion_array ()
-{
- register int i, j;
- HIST_ENTRY **hlist;
- char **tokens;
-
- /* First, clear out the current dynamic history completion list. */
- if (harry_size)
- {
- strvec_dispose (history_completion_array);
- history_completion_array = (char **)NULL;
- harry_size = 0;
- harry_len = 0;
- }
-
- /* Next, grovel each line of history, making each shell-sized token
- a separate entry in the history_completion_array. */
- hlist = history_list ();
-
- if (hlist)
- {
- for (i = 0; hlist[i]; i++)
- ;
- for ( --i; i >= 0; i--)
- {
- /* Separate each token, and place into an array. */
- tokens = history_tokenize (hlist[i]->line);
-
- for (j = 0; tokens && tokens[j]; j++)
- {
- if (harry_len + 2 > harry_size)
- history_completion_array = strvec_resize (history_completion_array, harry_size += 10);
-
- history_completion_array[harry_len++] = tokens[j];
- history_completion_array[harry_len] = (char *)NULL;
- }
- free (tokens);
- }
-
- /* Sort the complete list of tokens. */
- if (dabbrev_expand_active == 0)
- qsort (history_completion_array, harry_len, sizeof (char *), (QSFUNC *)strvec_strcmp);
- }
-}
-
-static char *
-history_completion_generator (hint_text, state)
- const char *hint_text;
- int state;
-{
- static int local_index, len;
- static const char *text;
-
- /* If this is the first call to the generator, then initialize the
- list of strings to complete over. */
- if (state == 0)
- {
- if (dabbrev_expand_active) /* This is kind of messy */
- rl_completion_suppress_append = 1;
- local_index = 0;
- build_history_completion_array ();
- text = hint_text;
- len = strlen (text);
- }
-
- while (history_completion_array && history_completion_array[local_index])
- {
- if (strncmp (text, history_completion_array[local_index++], len) == 0)
- return (savestring (history_completion_array[local_index - 1]));
- }
- return ((char *)NULL);
-}
-
-static int
-dynamic_complete_history (count, key)
- int count, key;
-{
- int r;
- rl_compentry_func_t *orig_func;
- rl_completion_func_t *orig_attempt_func;
- rl_compignore_func_t *orig_ignore_func;
-
- orig_func = rl_completion_entry_function;
- orig_attempt_func = rl_attempted_completion_function;
- orig_ignore_func = rl_ignore_some_completions_function;
-
- rl_completion_entry_function = history_completion_generator;
- rl_attempted_completion_function = (rl_completion_func_t *)NULL;
- rl_ignore_some_completions_function = filename_completion_ignore;
-
- /* XXX - use rl_completion_mode here? */
- if (rl_last_func == dynamic_complete_history)
- r = rl_complete_internal ('?');
- else
- r = rl_complete_internal (TAB);
-
- rl_completion_entry_function = orig_func;
- rl_attempted_completion_function = orig_attempt_func;
- rl_ignore_some_completions_function = orig_ignore_func;
-
- return r;
-}
-
-static int
-bash_dabbrev_expand (count, key)
- int count, key;
-{
- int r, orig_suppress, orig_sort;
- rl_compentry_func_t *orig_func;
- rl_completion_func_t *orig_attempt_func;
- rl_compignore_func_t *orig_ignore_func;
-
- orig_func = rl_menu_completion_entry_function;
- orig_attempt_func = rl_attempted_completion_function;
- orig_ignore_func = rl_ignore_some_completions_function;
- orig_suppress = rl_completion_suppress_append;
- orig_sort = rl_sort_completion_matches;
-
- rl_menu_completion_entry_function = history_completion_generator;
- rl_attempted_completion_function = (rl_completion_func_t *)NULL;
- rl_ignore_some_completions_function = filename_completion_ignore;
- rl_filename_completion_desired = 0;
- rl_completion_suppress_append = 1;
- rl_sort_completion_matches = 0;
-
- /* XXX - use rl_completion_mode here? */
- dabbrev_expand_active = 1;
- if (rl_last_func == bash_dabbrev_expand)
- rl_last_func = rl_menu_complete;
- r = rl_menu_complete (count, key);
- dabbrev_expand_active = 0;
-
- rl_last_func = bash_dabbrev_expand;
- rl_menu_completion_entry_function = orig_func;
- rl_attempted_completion_function = orig_attempt_func;
- rl_ignore_some_completions_function = orig_ignore_func;
- rl_completion_suppress_append = orig_suppress;
- rl_sort_completion_matches = orig_sort;
-
- return r;
-}
-
-#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
-static int
-bash_complete_username (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_username_internal (rl_completion_mode (bash_complete_username));
-}
-
-static int
-bash_possible_username_completions (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_username_internal ('?');
-}
-
-static int
-bash_complete_username_internal (what_to_do)
- int what_to_do;
-{
- return bash_specific_completion (what_to_do, rl_username_completion_function);
-}
-
-static int
-bash_complete_filename (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_filename_internal (rl_completion_mode (bash_complete_filename));
-}
-
-static int
-bash_possible_filename_completions (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_filename_internal ('?');
-}
-
-static int
-bash_complete_filename_internal (what_to_do)
- int what_to_do;
-{
- rl_compentry_func_t *orig_func;
- rl_completion_func_t *orig_attempt_func;
- rl_icppfunc_t *orig_dir_func;
- rl_compignore_func_t *orig_ignore_func;
- /*const*/ char *orig_rl_completer_word_break_characters;
- int r;
-
- orig_func = rl_completion_entry_function;
- orig_attempt_func = rl_attempted_completion_function;
- orig_ignore_func = rl_ignore_some_completions_function;
- orig_rl_completer_word_break_characters = rl_completer_word_break_characters;
-
- orig_dir_func = save_directory_hook ();
-
- rl_completion_entry_function = rl_filename_completion_function;
- rl_attempted_completion_function = (rl_completion_func_t *)NULL;
- rl_ignore_some_completions_function = filename_completion_ignore;
- rl_completer_word_break_characters = " \t\n\"\'";
-
- r = rl_complete_internal (what_to_do);
-
- rl_completion_entry_function = orig_func;
- rl_attempted_completion_function = orig_attempt_func;
- rl_ignore_some_completions_function = orig_ignore_func;
- rl_completer_word_break_characters = orig_rl_completer_word_break_characters;
-
- restore_directory_hook (orig_dir_func);
-
- return r;
-}
-
-static int
-bash_complete_hostname (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_hostname_internal (rl_completion_mode (bash_complete_hostname));
-}
-
-static int
-bash_possible_hostname_completions (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_hostname_internal ('?');
-}
-
-static int
-bash_complete_variable (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_variable_internal (rl_completion_mode (bash_complete_variable));
-}
-
-static int
-bash_possible_variable_completions (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_variable_internal ('?');
-}
-
-static int
-bash_complete_command (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_command_internal (rl_completion_mode (bash_complete_command));
-}
-
-static int
-bash_possible_command_completions (ignore, ignore2)
- int ignore, ignore2;
-{
- return bash_complete_command_internal ('?');
-}
-
-static int
-bash_complete_hostname_internal (what_to_do)
- int what_to_do;
-{
- return bash_specific_completion (what_to_do, hostname_completion_function);
-}
-
-static int
-bash_complete_variable_internal (what_to_do)
- int what_to_do;
-{
- return bash_specific_completion (what_to_do, variable_completion_function);
-}
-
-static int
-bash_complete_command_internal (what_to_do)
- int what_to_do;
-{
- return bash_specific_completion (what_to_do, command_word_completion_function);
-}
-
-static char *globtext;
-static char *globorig;
-
-static char *
-glob_complete_word (text, state)
- const char *text;
- int state;
-{
- static char **matches = (char **)NULL;
- static int ind;
- int glen;
- char *ret, *ttext;
-
- if (state == 0)
- {
- rl_filename_completion_desired = 1;
- FREE (matches);
- if (globorig != globtext)
- FREE (globorig);
- FREE (globtext);
-
- ttext = bash_tilde_expand (text, 0);
-
- if (rl_explicit_arg)
- {
- globorig = savestring (ttext);
- glen = strlen (ttext);
- globtext = (char *)xmalloc (glen + 2);
- strcpy (globtext, ttext);
- globtext[glen] = '*';
- globtext[glen+1] = '\0';
- }
- else
- globtext = globorig = savestring (ttext);
-
- if (ttext != text)
- free (ttext);
-
- matches = shell_glob_filename (globtext);
- if (GLOB_FAILED (matches))
- matches = (char **)NULL;
- ind = 0;
- }
-
- ret = matches ? matches[ind] : (char *)NULL;
- ind++;
- return ret;
-}
-
-static int
-bash_glob_completion_internal (what_to_do)
- int what_to_do;
-{
- return bash_specific_completion (what_to_do, glob_complete_word);
-}
-
-/* A special quoting function so we don't end up quoting globbing characters
- in the word if there are no matches or multiple matches. */
-static char *
-bash_glob_quote_filename (s, rtype, qcp)
- char *s;
- int rtype;
- char *qcp;
-{
- if (globorig && qcp && *qcp == '\0' && STREQ (s, globorig))
- return (savestring (s));
- else
- return (bash_quote_filename (s, rtype, qcp));
-}
-
-static int
-bash_glob_complete_word (count, key)
- int count, key;
-{
- int r;
- rl_quote_func_t *orig_quoting_function;
-
- if (rl_editing_mode == EMACS_EDITING_MODE)
- rl_explicit_arg = 1; /* force `*' append */
- orig_quoting_function = rl_filename_quoting_function;
- rl_filename_quoting_function = bash_glob_quote_filename;
-
- r = bash_glob_completion_internal (rl_completion_mode (bash_glob_complete_word));
-
- rl_filename_quoting_function = orig_quoting_function;
- return r;
-}
-
-static int
-bash_glob_expand_word (count, key)
- int count, key;
-{
- return bash_glob_completion_internal ('*');
-}
-
-static int
-bash_glob_list_expansions (count, key)
- int count, key;
-{
- return bash_glob_completion_internal ('?');
-}
-
-static int
-bash_specific_completion (what_to_do, generator)
- int what_to_do;
- rl_compentry_func_t *generator;
-{
- rl_compentry_func_t *orig_func;
- rl_completion_func_t *orig_attempt_func;
- rl_compignore_func_t *orig_ignore_func;
- int r;
-
- orig_func = rl_completion_entry_function;
- orig_attempt_func = rl_attempted_completion_function;
- orig_ignore_func = rl_ignore_some_completions_function;
- rl_completion_entry_function = generator;
- rl_attempted_completion_function = NULL;
- rl_ignore_some_completions_function = orig_ignore_func;
-
- r = rl_complete_internal (what_to_do);
-
- rl_completion_entry_function = orig_func;
- rl_attempted_completion_function = orig_attempt_func;
- rl_ignore_some_completions_function = orig_ignore_func;
-
- return r;
-}
-
-#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
-
-#if defined (VI_MODE)
-/* Completion, from vi mode's point of view. This is a modified version of
- rl_vi_complete which uses the bash globbing code to implement what POSIX
- specifies, which is to append a `*' and attempt filename generation (which
- has the side effect of expanding any globbing characters in the word). */
-static int
-bash_vi_complete (count, key)
- int count, key;
-{
-#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
- int p, r;
- char *t;
-
- if ((rl_point < rl_end) && (!whitespace (rl_line_buffer[rl_point])))
- {
- if (!whitespace (rl_line_buffer[rl_point + 1]))
- rl_vi_end_word (1, 'E');
- rl_point++;
- }
-
- /* Find boundaries of current word, according to vi definition of a
- `bigword'. */
- t = 0;
- if (rl_point > 0)
- {
- p = rl_point;
- rl_vi_bWord (1, 'B');
- r = rl_point;
- rl_point = p;
- p = r;
-
- t = substring (rl_line_buffer, p, rl_point);
- }
-
- if (t && glob_pattern_p (t) == 0)
- rl_explicit_arg = 1; /* XXX - force glob_complete_word to append `*' */
- FREE (t);
-
- if (key == '*') /* Expansion and replacement. */
- r = bash_glob_expand_word (count, key);
- else if (key == '=') /* List possible completions. */
- r = bash_glob_list_expansions (count, key);
- else if (key == '\\') /* Standard completion */
- r = bash_glob_complete_word (count, key);
- else
- r = rl_complete (0, key);
-
- if (key == '*' || key == '\\')
- rl_vi_start_inserting (key, 1, 1);
-
- return (r);
-#else
- return rl_vi_complete (count, key);
-#endif /* !SPECIFIC_COMPLETION_FUNCTIONS */
-}
-#endif /* VI_MODE */
-
-/* Filename quoting for completion. */
-/* A function to strip unquoted quote characters (single quotes, double
- quotes, and backslashes). It allows single quotes to appear
- within double quotes, and vice versa. It should be smarter. */
-static char *
-bash_dequote_filename (text, quote_char)
- char *text;
- int quote_char;
-{
- char *ret, *p, *r;
- int l, quoted;
-
- l = strlen (text);
- ret = (char *)xmalloc (l + 1);
- for (quoted = quote_char, p = text, r = ret; p && *p; p++)
- {
- /* Allow backslash-escaped characters to pass through unscathed. */
- if (*p == '\\')
- {
- /* Backslashes are preserved within single quotes. */
- if (quoted == '\'')
- *r++ = *p;
- /* Backslashes are preserved within double quotes unless the
- character is one that is defined to be escaped */
- else if (quoted == '"' && ((sh_syntaxtab[p[1]] & CBSDQUOTE) == 0))
- *r++ = *p;
-
- *r++ = *++p;
- if (*p == '\0')
- return ret; /* XXX - was break; */
- continue;
- }
- /* Close quote. */
- if (quoted && *p == quoted)
- {
- quoted = 0;
- continue;
- }
- /* Open quote. */
- if (quoted == 0 && (*p == '\'' || *p == '"'))
- {
- quoted = *p;
- continue;
- }
- *r++ = *p;
- }
- *r = '\0';
- return ret;
-}
-
-/* Quote characters that the readline completion code would treat as
- word break characters with backslashes. Pass backslash-quoted
- characters through without examination. */
-static char *
-quote_word_break_chars (text)
- char *text;
-{
- char *ret, *r, *s;
- int l;
-
- l = strlen (text);
- ret = (char *)xmalloc ((2 * l) + 1);
- for (s = text, r = ret; *s; s++)
- {
- /* Pass backslash-quoted characters through, including the backslash. */
- if (*s == '\\')
- {
- *r++ = '\\';
- *r++ = *++s;
- if (*s == '\0')
- break;
- continue;
- }
- /* OK, we have an unquoted character. Check its presence in
- rl_completer_word_break_characters. */
- if (mbschr (rl_completer_word_break_characters, *s))
- *r++ = '\\';
- /* XXX -- check for standalone tildes here and backslash-quote them */
- if (s == text && *s == '~' && file_exists (text))
- *r++ = '\\';
- *r++ = *s;
- }
- *r = '\0';
- return ret;
-}
-
-/* Use characters in STRING to populate the table of characters that should
- be backslash-quoted. The table will be used for sh_backslash_quote from
- this file. */
-static void
-set_filename_bstab (string)
- const char *string;
-{
- const char *s;
-
- memset (filename_bstab, 0, sizeof (filename_bstab));
- for (s = string; s && *s; s++)
- filename_bstab[*s] = 1;
-}
-
-/* Quote a filename using double quotes, single quotes, or backslashes
- depending on the value of completion_quoting_style. If we're
- completing using backslashes, we need to quote some additional
- characters (those that readline treats as word breaks), so we call
- quote_word_break_chars on the result. This returns newly-allocated
- memory. */
-static char *
-bash_quote_filename (s, rtype, qcp)
- char *s;
- int rtype;
- char *qcp;
-{
- char *rtext, *mtext, *ret;
- int rlen, cs;
-
- rtext = (char *)NULL;
-
- /* If RTYPE == MULT_MATCH, it means that there is
- more than one match. In this case, we do not add
- the closing quote or attempt to perform tilde
- expansion. If RTYPE == SINGLE_MATCH, we try
- to perform tilde expansion, because single and double
- quotes inhibit tilde expansion by the shell. */
-
- cs = completion_quoting_style;
- /* Might need to modify the default completion style based on *qcp,
- since it's set to any user-provided opening quote. We also change
- to single-quoting if there is no user-provided opening quote and
- the word being completed contains newlines, since those are not
- quoted correctly using backslashes (a backslash-newline pair is
- special to the shell parser). */
- if (*qcp == '\0' && cs == COMPLETE_BSQUOTE && mbschr (s, '\n'))
- cs = COMPLETE_SQUOTE;
- else if (*qcp == '"')
- cs = COMPLETE_DQUOTE;
- else if (*qcp == '\'')
- cs = COMPLETE_SQUOTE;
-#if defined (BANG_HISTORY)
- else if (*qcp == '\0' && history_expansion && cs == COMPLETE_DQUOTE &&
- history_expansion_inhibited == 0 && mbschr (s, '!'))
- cs = COMPLETE_BSQUOTE;
-
- if (*qcp == '"' && history_expansion && cs == COMPLETE_DQUOTE &&
- history_expansion_inhibited == 0 && mbschr (s, '!'))
- {
- cs = COMPLETE_BSQUOTE;
- *qcp = '\0';
- }
-#endif
-
- /* Don't tilde-expand backslash-quoted filenames, since only single and
- double quotes inhibit tilde expansion. */
- mtext = s;
- if (mtext[0] == '~' && rtype == SINGLE_MATCH && cs != COMPLETE_BSQUOTE)
- mtext = bash_tilde_expand (s, 0);
-
- switch (cs)
- {
- case COMPLETE_DQUOTE:
- rtext = sh_double_quote (mtext);
- break;
- case COMPLETE_SQUOTE:
- rtext = sh_single_quote (mtext);
- break;
- case COMPLETE_BSQUOTE:
- rtext = sh_backslash_quote (mtext, complete_fullquote ? 0 : filename_bstab, 0);
- break;
- }
-
- if (mtext != s)
- free (mtext);
-
- /* We may need to quote additional characters: those that readline treats
- as word breaks that are not quoted by backslash_quote. */
- if (rtext && cs == COMPLETE_BSQUOTE)
- {
- mtext = quote_word_break_chars (rtext);
- free (rtext);
- rtext = mtext;
- }
-
- /* Leave the opening quote intact. The readline completion code takes
- care of avoiding doubled opening quotes. */
- if (rtext)
- {
- rlen = strlen (rtext);
- ret = (char *)xmalloc (rlen + 1);
- strcpy (ret, rtext);
- }
- else
- {
- ret = (char *)xmalloc (rlen = 1);
- ret[0] = '\0';
- }
-
- /* If there are multiple matches, cut off the closing quote. */
- if (rtype == MULT_MATCH && cs != COMPLETE_BSQUOTE)
- ret[rlen - 1] = '\0';
- free (rtext);
- return ret;
-}
-
-/* Support for binding readline key sequences to Unix commands. */
-static Keymap cmd_xmap;
-
-#ifdef _MINIX
-static void
-#else
-static int
-#endif
-putx(c)
- int c;
-{
- int x;
- x = putc (c, rl_outstream);
-#ifndef _MINIX
- return x;
-#endif
-}
-
-static int
-bash_execute_unix_command (count, key)
- int count; /* ignored */
- int key;
-{
- Keymap ckmap; /* current keymap */
- Keymap xkmap; /* unix command executing keymap */
- rl_command_func_t *func;
- int type;
- register int i, r;
- intmax_t mi;
- sh_parser_state_t ps;
- char *cmd, *value, *l, *l1, *ce;
- SHELL_VAR *v;
- char ibuf[INT_STRLEN_BOUND(int) + 1];
-
- /* First, we need to find the right command to execute. This is tricky,
- because we might have already indirected into another keymap, so we
- have to walk cmd_xmap using the entire key sequence. */
- cmd = (char *)rl_function_of_keyseq (rl_executing_keyseq, cmd_xmap, &type);
-
- if (cmd == 0 || type != ISMACR)
- {
- rl_crlf ();
- internal_error (_("bash_execute_unix_command: cannot find keymap for command"));
- rl_forced_update_display ();
- return 1;
- }
-
- ce = rl_get_termcap ("ce");
- if (ce) /* clear current line */
- {
- fprintf (rl_outstream, "\r");
- tputs (ce, 1, putx);
- fflush (rl_outstream);
- }
- else
- rl_crlf (); /* move to a new line */
-
- v = bind_variable ("READLINE_LINE", rl_line_buffer, 0);
- if (v)
- VSETATTR (v, att_exported);
- l = v ? value_cell (v) : 0;
- value = inttostr (rl_point, ibuf, sizeof (ibuf));
- v = bind_int_variable ("READLINE_POINT", value);
- if (v)
- VSETATTR (v, att_exported);
- array_needs_making = 1;
-
- save_parser_state (&ps);
- r = parse_and_execute (cmd, "bash_execute_unix_command", SEVAL_NOHIST|SEVAL_NOFREE);
- restore_parser_state (&ps);
-
- v = find_variable ("READLINE_LINE");
- l1 = v ? value_cell (v) : 0;
- if (l1 != l)
- maybe_make_readline_line (value_cell (v));
- v = find_variable ("READLINE_POINT");
- if (v && legal_number (value_cell (v), &mi))
- {
- i = mi;
- if (i != rl_point)
- {
- rl_point = i;
- if (rl_point > rl_end)
- rl_point = rl_end;
- else if (rl_point < 0)
- rl_point = 0;
- }
- }
-
- unbind_variable ("READLINE_LINE");
- unbind_variable ("READLINE_POINT");
- array_needs_making = 1;
-
- /* and restore the readline buffer and display after command execution. */
- rl_forced_update_display ();
- return 0;
-}
-
-int
-print_unix_command_map ()
-{
- Keymap save;
-
- save = rl_get_keymap ();
- rl_set_keymap (cmd_xmap);
- rl_macro_dumper (1);
- rl_set_keymap (save);
- return 0;
-}
-
-static void
-init_unix_command_map ()
-{
- cmd_xmap = rl_make_bare_keymap ();
-}
-
-static int
-isolate_sequence (string, ind, need_dquote, startp)
- char *string;
- int ind, need_dquote, *startp;
-{
- register int i;
- int c, passc, delim;
-
- for (i = ind; string[i] && whitespace (string[i]); i++)
- ;
- /* NEED_DQUOTE means that the first non-white character *must* be `"'. */
- if (need_dquote && string[i] != '"')
- {
- builtin_error (_("%s: first non-whitespace character is not `\"'"), string);
- return -1;
- }
-
- /* We can have delimited strings even if NEED_DQUOTE == 0, like the command
- string to bind the key sequence to. */
- delim = (string[i] == '"' || string[i] == '\'') ? string[i] : 0;
-
- if (startp)
- *startp = delim ? ++i : i;
-
- for (passc = 0; c = string[i]; i++)
- {
- if (passc)
- {
- passc = 0;
- continue;
- }
- if (c == '\\')
- {
- passc++;
- continue;
- }
- if (c == delim)
- break;
- }
-
- if (delim && string[i] != delim)
- {
- builtin_error (_("no closing `%c' in %s"), delim, string);
- return -1;
- }
-
- return i;
-}
-
-int
-bind_keyseq_to_unix_command (line)
- char *line;
-{
- Keymap kmap;
- char *kseq, *value;
- int i, kstart;
-
- if (cmd_xmap == 0)
- init_unix_command_map ();
-
- kmap = rl_get_keymap ();
-
- /* We duplicate some of the work done by rl_parse_and_bind here, but
- this code only has to handle `"keyseq": ["]command["]' and can
- generate an error for anything else. */
- i = isolate_sequence (line, 0, 1, &kstart);
- if (i < 0)
- return -1;
-
- /* Create the key sequence string to pass to rl_generic_bind */
- kseq = substring (line, kstart, i);
-
- for ( ; line[i] && line[i] != ':'; i++)
- ;
- if (line[i] != ':')
- {
- builtin_error (_("%s: missing colon separator"), line);
- FREE (kseq);
- return -1;
- }
-
- i = isolate_sequence (line, i + 1, 0, &kstart);
- if (i < 0)
- {
- FREE (kseq);
- return -1;
- }
-
- /* Create the value string containing the command to execute. */
- value = substring (line, kstart, i);
-
- /* Save the command to execute and the key sequence in the CMD_XMAP */
- rl_generic_bind (ISMACR, kseq, value, cmd_xmap);
-
- /* and bind the key sequence in the current keymap to a function that
- understands how to execute from CMD_XMAP */
- rl_bind_keyseq_in_map (kseq, bash_execute_unix_command, kmap);
-
- free (kseq);
- return 0;
-}
-
-/* Used by the programmable completion code. Complete TEXT as a filename,
- but return only directories as matches. Dequotes the filename before
- attempting to find matches. */
-char **
-bash_directory_completion_matches (text)
- const char *text;
-{
- char **m1;
- char *dfn;
- int qc;
-
- qc = rl_dispatching ? rl_completion_quote_character : 0;
- /* If rl_completion_found_quote != 0, rl_completion_matches will call the
- filename dequoting function, causing the directory name to be dequoted
- twice. */
- if (rl_dispatching && rl_completion_found_quote == 0)
- dfn = bash_dequote_filename ((char *)text, qc);
- else
- dfn = (char *)text;
- m1 = rl_completion_matches (dfn, rl_filename_completion_function);
- if (dfn != text)
- free (dfn);
-
- if (m1 == 0 || m1[0] == 0)
- return m1;
- /* We don't bother recomputing the lcd of the matches, because it will just
- get thrown away by the programmable completion code and recomputed
- later. */
- (void)bash_ignore_filenames (m1);
- return m1;
-}
-
-char *
-bash_dequote_text (text)
- const char *text;
-{
- char *dtxt;
- int qc;
-
- qc = (text[0] == '"' || text[0] == '\'') ? text[0] : 0;
- dtxt = bash_dequote_filename ((char *)text, qc);
- return (dtxt);
-}
-
-/* This event hook is designed to be called after readline receives a signal
- that interrupts read(2). It gives reasonable responsiveness to interrupts
- and fatal signals without executing too much code in a signal handler
- context. */
-static int
-bash_event_hook ()
-{
- /* If we're going to longjmp to top_level, make sure we clean up readline.
- check_signals will call QUIT, which will eventually longjmp to top_level,
- calling run_interrupt_trap along the way. The check for sigalrm_seen is
- to clean up the read builtin's state. */
- if (interrupt_state || sigalrm_seen)
- rl_cleanup_after_signal ();
- bashline_reset_event_hook ();
- check_signals_and_traps (); /* XXX */
- return 0;
-}
-
-#endif /* READLINE */
+++ /dev/null
-/* bashgetopt.c -- `getopt' for use by the builtins. */
-
-/* Copyright (C) 1992-2002 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#include "../bashansi.h"
-#include <chartypes.h>
-#include <errno.h>
-
-#include "../shell.h"
-#include "common.h"
-
-#define ISOPT(s) (((*(s) == '-') || (plus && *(s) == '+')) && (s)[1])
-#define NOTOPT(s) (((*(s) != '-') && (!plus || *(s) != '+')) || (s)[1] == '\0')
-
-static int sp;
-
-char *list_optarg;
-int list_optopt;
-int list_opttype;
-
-static WORD_LIST *lhead = (WORD_LIST *)NULL;
-WORD_LIST *lcurrent = (WORD_LIST *)NULL;
-WORD_LIST *loptend; /* Points to the first non-option argument in the list */
-
-int
-internal_getopt(list, opts)
-WORD_LIST *list;
-char *opts;
-{
- register int c;
- register char *cp;
- int plus; /* nonzero means to handle +option */
- static char errstr[3] = { '-', '\0', '\0' };
-
- plus = *opts == '+';
- if (plus)
- opts++;
-
- if (list == 0) {
- list_optarg = (char *)NULL;
- loptend = (WORD_LIST *)NULL; /* No non-option arguments */
- return -1;
- }
-
- if (list != lhead || lhead == 0) {
- /* Hmmm.... called with a different word list. Reset. */
- sp = 1;
- lcurrent = lhead = list;
- loptend = (WORD_LIST *)NULL;
- }
-
- if (sp == 1) {
- if (lcurrent == 0 || NOTOPT(lcurrent->word->word)) {
- lhead = (WORD_LIST *)NULL;
- loptend = lcurrent;
- return(-1);
- } else if (ISHELP (lcurrent->word->word)) {
- lhead = (WORD_LIST *)NULL;
- loptend = lcurrent;
- return (GETOPT_HELP);
- } else if (lcurrent->word->word[0] == '-' &&
- lcurrent->word->word[1] == '-' &&
- lcurrent->word->word[2] == 0) {
- lhead = (WORD_LIST *)NULL;
- loptend = lcurrent->next;
- return(-1);
- }
- errstr[0] = list_opttype = lcurrent->word->word[0];
- }
-
- list_optopt = c = lcurrent->word->word[sp];
-
- if (c == ':' || (cp = strchr(opts, c)) == NULL) {
- errstr[1] = c;
- sh_invalidopt (errstr);
- if (lcurrent->word->word[++sp] == '\0') {
- lcurrent = lcurrent->next;
- sp = 1;
- }
- list_optarg = NULL;
- if (lcurrent)
- loptend = lcurrent->next;
- return('?');
- }
-
- if (*++cp == ':' || *cp == ';') {
- /* `:': Option requires an argument. */
- /* `;': option argument may be missing */
- /* We allow -l2 as equivalent to -l 2 */
- if (lcurrent->word->word[sp+1]) {
- list_optarg = lcurrent->word->word + sp + 1;
- lcurrent = lcurrent->next;
- /* If the specifier is `;', don't set optarg if the next
- argument looks like another option. */
-#if 0
- } else if (lcurrent->next && (*cp == ':' || lcurrent->next->word->word[0] != '-')) {
-#else
- } else if (lcurrent->next && (*cp == ':' || NOTOPT(lcurrent->next->word->word))) {
-#endif
- lcurrent = lcurrent->next;
- list_optarg = lcurrent->word->word;
- lcurrent = lcurrent->next;
- } else if (*cp == ';') {
- list_optarg = (char *)NULL;
- lcurrent = lcurrent->next;
- } else { /* lcurrent->next == NULL */
- errstr[1] = c;
- sh_needarg (errstr);
- sp = 1;
- list_optarg = (char *)NULL;
- return('?');
- }
- sp = 1;
- } else if (*cp == '#') {
- /* option requires a numeric argument */
- if (lcurrent->word->word[sp+1]) {
- if (DIGIT(lcurrent->word->word[sp+1])) {
- list_optarg = lcurrent->word->word + sp + 1;
- lcurrent = lcurrent->next;
- } else
- list_optarg = (char *)NULL;
- } else {
- if (lcurrent->next && legal_number(lcurrent->next->word->word, (intmax_t *)0)) {
- lcurrent = lcurrent->next;
- list_optarg = lcurrent->word->word;
- lcurrent = lcurrent->next;
- } else {
- errstr[1] = c;
- sh_neednumarg (errstr);
- sp = 1;
- list_optarg = (char *)NULL;
- return ('?');
- }
- }
-
- } else {
- /* No argument, just return the option. */
- if (lcurrent->word->word[++sp] == '\0') {
- sp = 1;
- lcurrent = lcurrent->next;
- }
- list_optarg = (char *)NULL;
- }
-
- return(c);
-}
-
-/*
- * reset_internal_getopt -- force the in[ft]ernal getopt to reset
- */
-
-void
-reset_internal_getopt ()
-{
- lhead = lcurrent = loptend = (WORD_LIST *)NULL;
- sp = 1;
-}
+++ /dev/null
-/* bashgetopt.h -- extern declarations for stuff defined in bashgetopt.c. */
-
-/* Copyright (C) 1993 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/* See getopt.h for the explanation of these variables. */
-
-#if !defined (__BASH_GETOPT_H)
-# define __BASH_GETOPT_H
-
-#include <stdc.h>
-
-extern char *list_optarg;
-
-extern int list_optopt;
-extern int list_opttype;
-
-extern WORD_LIST *lcurrent;
-extern WORD_LIST *loptend;
-
-extern int internal_getopt __P((WORD_LIST *, char *));
-extern void reset_internal_getopt __P((void));
-
-#endif /* !__BASH_GETOPT_H */
+++ /dev/null
-This file is break.def, from which is created break.c.
-It implements the builtins "break" and "continue" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES break.c
-
-$BUILTIN break
-$FUNCTION break_builtin
-$SHORT_DOC break [n]
-Exit for, while, or until loops.
-
-Exit a FOR, WHILE or UNTIL loop. If N is specified, break N enclosing
-loops.
-
-Exit Status:
-The exit status is 0 unless N is not greater than or equal to 1.
-$END
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "common.h"
-
-extern char *this_command_name;
-extern int posixly_correct;
-
-static int check_loop_level __P((void));
-
-/* The depth of while's and until's. */
-int loop_level = 0;
-
-/* Non-zero when a "break" instruction is encountered. */
-int breaking = 0;
-
-/* Non-zero when we have encountered a continue instruction. */
-int continuing = 0;
-
-/* Set up to break x levels, where x defaults to 1, but can be specified
- as the first argument. */
-int
-break_builtin (list)
- WORD_LIST *list;
-{
- intmax_t newbreak;
-
- if (check_loop_level () == 0)
- return (EXECUTION_SUCCESS);
-
- (void)get_numeric_arg (list, 1, &newbreak);
-
- if (newbreak <= 0)
- {
- sh_erange (list->word->word, _("loop count"));
- breaking = loop_level;
- return (EXECUTION_FAILURE);
- }
-
- if (newbreak > loop_level)
- newbreak = loop_level;
-
- breaking = newbreak;
-
- return (EXECUTION_SUCCESS);
-}
-
-$BUILTIN continue
-$FUNCTION continue_builtin
-$SHORT_DOC continue [n]
-Resume for, while, or until loops.
-
-Resumes the next iteration of the enclosing FOR, WHILE or UNTIL loop.
-If N is specified, resumes the Nth enclosing loop.
-
-Exit Status:
-The exit status is 0 unless N is not greater than or equal to 1.
-$END
-
-/* Set up to continue x levels, where x defaults to 1, but can be specified
- as the first argument. */
-int
-continue_builtin (list)
- WORD_LIST *list;
-{
- intmax_t newcont;
-
- if (check_loop_level () == 0)
- return (EXECUTION_SUCCESS);
-
- (void)get_numeric_arg (list, 1, &newcont);
-
- if (newcont <= 0)
- {
- sh_erange (list->word->word, _("loop count"));
- breaking = loop_level;
- return (EXECUTION_FAILURE);
- }
-
- if (newcont > loop_level)
- newcont = loop_level;
-
- continuing = newcont;
-
- return (EXECUTION_SUCCESS);
-}
-
-/* Return non-zero if a break or continue command would be okay.
- Print an error message if break or continue is meaningless here. */
-static int
-check_loop_level ()
-{
-#if defined (BREAK_COMPLAINS)
- if (loop_level == 0 && posixly_correct == 0)
- builtin_error (_("only meaningful in a `for', `while', or `until' loop"));
-#endif /* BREAK_COMPLAINS */
-
- return (loop_level);
-}
+++ /dev/null
-This file is caller.def, from which is created caller.c. It implements the
-builtin "caller" in Bash.
-
-Copyright (C) 2002-2008 Rocky Bernstein for Free Software Foundation, Inc.
-Copyright (C) 2008-2013 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES caller.c
-
-$BUILTIN caller
-$FUNCTION caller_builtin
-$DEPENDS_ON DEBUGGER
-$SHORT_DOC caller [expr]
-Return the context of the current subroutine call.
-
-Without EXPR, returns "$line $filename". With EXPR, returns
-"$line $subroutine $filename"; this extra information can be used to
-provide a stack trace.
-
-The value of EXPR indicates how many call frames to go back before the
-current one; the top frame is frame 0.
-
-Exit Status:
-Returns 0 unless the shell is not executing a shell function or EXPR
-is invalid.
-$END
-
-#include <config.h>
-#include <stdio.h>
-#include "chartypes.h"
-#include "bashtypes.h"
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include <errno.h>
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "common.h"
-#include "builtext.h"
-#include "bashgetopt.h"
-
-#ifdef LOADABLE_BUILTIN
-# include "builtins.h"
-#endif
-
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-int
-caller_builtin (list)
- WORD_LIST *list;
-{
-#if !defined (ARRAY_VARS)
- printf ("1 NULL\n");
- return (EXECUTION_FAILURE);
-#else
- SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
- ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
- char *funcname_s, *source_s, *lineno_s;
- intmax_t num;
-
- if (list && list->word && ISHELP (list->word->word))
- {
- builtin_help ();
- return (EX_USAGE);
- }
-
- GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
- GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
- GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
-
- if (bash_lineno_a == 0 || array_empty (bash_lineno_a))
- return (EXECUTION_FAILURE);
-
- if (bash_source_a == 0 || array_empty (bash_source_a))
- return (EXECUTION_FAILURE);
-
- if (no_options (list))
- return (EX_USAGE);
- list = loptend; /* skip over possible `--' */
-
- /* If there is no argument list, then give short form: line filename. */
- if (list == 0)
- {
- lineno_s = array_reference (bash_lineno_a, 0);
- source_s = array_reference (bash_source_a, 1);
- printf("%s %s\n", lineno_s ? lineno_s : "NULL", source_s ? source_s : "NULL");
- return (EXECUTION_SUCCESS);
- }
-
- if (funcname_a == 0 || array_empty (funcname_a))
- return (EXECUTION_FAILURE);
-
- if (legal_number (list->word->word, &num))
- {
- lineno_s = array_reference (bash_lineno_a, num);
- source_s = array_reference (bash_source_a, num+1);
- funcname_s = array_reference (funcname_a, num+1);
-
- if (lineno_s == NULL|| source_s == NULL || funcname_s == NULL)
- return (EXECUTION_FAILURE);
-
- printf("%s %s %s\n", lineno_s, funcname_s, source_s);
- }
- else
- {
- sh_invalidnum (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
-
- return (EXECUTION_SUCCESS);
-#endif
-}
-
-#ifdef LOADABLE_BUILTIN
-static char *caller_doc[] = {
-N_("Returns the context of the current subroutine call.\n\
- \n\
- Without EXPR, returns "$line $filename". With EXPR, returns\n\
- "$line $subroutine $filename"; this extra information can be used to\n\
- provide a stack trace.\n\
- \n\
- The value of EXPR indicates how many call frames to go back before the\n\
- current one; the top frame is frame 0."),
- (char *)NULL
-};
-
-struct builtin caller_struct = {
- "caller",
- caller_builtin,
- BUILTIN_ENABLED,
- caller_doc,
- "caller [EXPR]",
- 0
-};
-
-#endif /* LOADABLE_BUILTIN */
+++ /dev/null
-This file is command.def, from which is created command.c.
-It implements the builtin "command" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES command.c
-
-$BUILTIN command
-$FUNCTION command_builtin
-$SHORT_DOC command [-pVv] command [arg ...]
-Execute a simple command or display information about commands.
-
-Runs COMMAND with ARGS suppressing shell function lookup, or display
-information about the specified COMMANDs. Can be used to invoke commands
-on disk when a function with the same name exists.
-
-Options:
- -p use a default value for PATH that is guaranteed to find all of
- the standard utilities
- -v print a description of COMMAND similar to the `type' builtin
- -V print a more verbose description of each COMMAND
-
-Exit Status:
-Returns exit status of COMMAND, or failure if COMMAND is not found.
-$END
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashansi.h"
-
-#include "../shell.h"
-#include "../execute_cmd.h"
-#include "../flags.h"
-#include "bashgetopt.h"
-#include "common.h"
-
-#if defined (_CS_PATH) && defined (HAVE_CONFSTR) && !HAVE_DECL_CONFSTR
-extern size_t confstr __P((int, char *, size_t));
-#endif
-
-extern int subshell_environment;
-
-static void restore_path __P((char *));
-static char *get_standard_path __P((void));
-
-/* Run the commands mentioned in LIST without paying attention to shell
- functions. */
-int
-command_builtin (list)
- WORD_LIST *list;
-{
- int result, verbose, use_standard_path, opt;
- char *old_path, *standard_path;
- COMMAND *command;
-
- verbose = use_standard_path = 0;
- reset_internal_getopt ();
- while ((opt = internal_getopt (list, "pvV")) != -1)
- {
- switch (opt)
- {
- case 'p':
- use_standard_path = 1;
- break;
- case 'V':
- verbose = CDESC_SHORTDESC|CDESC_ABSPATH; /* look in common.h for constants */
- break;
- case 'v':
- verbose = CDESC_REUSABLE; /* ditto */
- break;
- default:
- builtin_usage ();
- return (EX_USAGE);
- }
- }
- list = loptend;
-
- if (list == 0)
- return (EXECUTION_SUCCESS);
-
-#if defined (RESTRICTED_SHELL)
- if (use_standard_path && restricted)
- {
- sh_restricted ("-p");
- return (EXECUTION_FAILURE);
- }
-#endif
-
- begin_unwind_frame ("command_builtin");
-
- if (use_standard_path)
- {
- old_path = get_string_value ("PATH");
- /* If old_path is NULL, $PATH is unset. If so, we want to make sure
- it's unset after this command completes. */
- if (old_path)
- old_path = savestring (old_path);
- add_unwind_protect ((Function *)restore_path, old_path);
-
- standard_path = get_standard_path ();
- bind_variable ("PATH", standard_path ? standard_path : "", 0);
- stupidly_hack_special_variables ("PATH");
- FREE (standard_path);
- }
-
- if (verbose)
- {
- int found, any_found;
-
- for (any_found = 0; list; list = list->next)
- {
- found = describe_command (list->word->word, verbose);
-
- if (found == 0 && verbose != CDESC_REUSABLE)
- sh_notfound (list->word->word);
-
- any_found += found;
- }
-
- run_unwind_frame ("command_builtin");
- return (any_found ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
- }
-
-#define COMMAND_BUILTIN_FLAGS (CMD_NO_FUNCTIONS | CMD_INHIBIT_EXPANSION | CMD_COMMAND_BUILTIN)
-
- /* We don't want this to be reparsed (consider command echo 'foo &'), so
- just make a simple_command structure and call execute_command with it. */
- command = make_bare_simple_command ();
- command->value.Simple->words = (WORD_LIST *)copy_word_list (list);
- command->value.Simple->redirects = (REDIRECT *)NULL;
- command->flags |= COMMAND_BUILTIN_FLAGS;
- command->value.Simple->flags |= COMMAND_BUILTIN_FLAGS;
-#if 0
- /* This breaks for things like ( cd /tmp ; command z ababa ; echo next )
- or $(command echo a ; command echo b;) or even
- { command echo a; command echo b; } & */
- /* If we're in a subshell, see if we can get away without forking
- again, since we've already forked to run this builtin. */
- if (subshell_environment)
- {
- command->flags |= CMD_NO_FORK;
- command->value.Simple->flags |= CMD_NO_FORK;
- }
-#endif
- add_unwind_protect ((char *)dispose_command, command);
- result = execute_command (command);
-
- run_unwind_frame ("command_builtin");
-
- return (result);
-}
-
-/* Restore the value of the $PATH variable after replacing it when
- executing `command -p'. */
-static void
-restore_path (var)
- char *var;
-{
- if (var)
- {
- bind_variable ("PATH", var, 0);
- free (var);
- }
- else
- unbind_variable ("PATH");
-
- stupidly_hack_special_variables ("PATH");
-}
-
-/* Return a value for PATH that is guaranteed to find all of the standard
- utilities. This uses Posix.2 configuration variables, if present. It
- uses a value defined in config.h as a last resort. */
-static char *
-get_standard_path ()
-{
-#if defined (_CS_PATH) && defined (HAVE_CONFSTR)
- char *p;
- size_t len;
-
- len = (size_t)confstr (_CS_PATH, (char *)NULL, (size_t)0);
- if (len > 0)
- {
- p = (char *)xmalloc (len + 2);
- *p = '\0';
- confstr (_CS_PATH, p, len);
- return (p);
- }
- else
- return (savestring (STANDARD_UTILS_PATH));
-#else /* !_CS_PATH || !HAVE_CONFSTR */
-# if defined (CS_PATH)
- return (savestring (CS_PATH));
-# else
- return (savestring (STANDARD_UTILS_PATH));
-# endif /* !CS_PATH */
-#endif /* !_CS_PATH || !HAVE_CONFSTR */
-}
+++ /dev/null
-/* common.c - utility functions for all builtins */
-
-/* Copyright (C) 1987-2010 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include <stdio.h>
-#include <chartypes.h>
-#include "../bashtypes.h"
-#include "posixstat.h"
-#include <signal.h>
-
-#include <errno.h>
-
-#if defined (PREFER_STDARG)
-# include <stdarg.h>
-#else
-# include <varargs.h>
-#endif
-
-#include "../bashansi.h"
-#include "../bashintl.h"
-
-#define NEED_FPURGE_DECL
-
-#include "../shell.h"
-#include "maxpath.h"
-#include "../flags.h"
-#include "../jobs.h"
-#include "../builtins.h"
-#include "../input.h"
-#include "../execute_cmd.h"
-#include "../trap.h"
-#include "bashgetopt.h"
-#include "common.h"
-#include "builtext.h"
-#include <tilde/tilde.h>
-
-#if defined (HISTORY)
-# include "../bashhist.h"
-#endif
-
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-extern int indirection_level, subshell_environment;
-extern int line_number;
-extern int last_command_exit_value;
-extern int trap_saved_exit_value;
-extern int running_trap;
-extern int posixly_correct;
-extern char *this_command_name, *shell_name;
-extern const char * const bash_getcwd_errstr;
-
-/* Used by some builtins and the mainline code. */
-sh_builtin_func_t *last_shell_builtin = (sh_builtin_func_t *)NULL;
-sh_builtin_func_t *this_shell_builtin = (sh_builtin_func_t *)NULL;
-
-/* **************************************************************** */
-/* */
-/* Error reporting, usage, and option processing */
-/* */
-/* **************************************************************** */
-
-/* This is a lot like report_error (), but it is for shell builtins
- instead of shell control structures, and it won't ever exit the
- shell. */
-
-static void
-builtin_error_prolog ()
-{
- char *name;
-
- name = get_name_for_error ();
- fprintf (stderr, "%s: ", name);
-
- if (interactive_shell == 0)
- fprintf (stderr, _("line %d: "), executing_line_number ());
-
- if (this_command_name && *this_command_name)
- fprintf (stderr, "%s: ", this_command_name);
-}
-
-void
-#if defined (PREFER_STDARG)
-builtin_error (const char *format, ...)
-#else
-builtin_error (format, va_alist)
- const char *format;
- va_dcl
-#endif
-{
- va_list args;
-
- builtin_error_prolog ();
-
- SH_VA_START (args, format);
-
- vfprintf (stderr, format, args);
- va_end (args);
- fprintf (stderr, "\n");
-}
-
-void
-#if defined (PREFER_STDARG)
-builtin_warning (const char *format, ...)
-#else
-builtin_warning (format, va_alist)
- const char *format;
- va_dcl
-#endif
-{
- va_list args;
-
- builtin_error_prolog ();
- fprintf (stderr, _("warning: "));
-
- SH_VA_START (args, format);
-
- vfprintf (stderr, format, args);
- va_end (args);
- fprintf (stderr, "\n");
-}
-
-/* Print a usage summary for the currently-executing builtin command. */
-void
-builtin_usage ()
-{
- if (this_command_name && *this_command_name)
- fprintf (stderr, _("%s: usage: "), this_command_name);
- fprintf (stderr, "%s\n", _(current_builtin->short_doc));
- fflush (stderr);
-}
-
-/* Return if LIST is NULL else barf and jump to top_level. Used by some
- builtins that do not accept arguments. */
-void
-no_args (list)
- WORD_LIST *list;
-{
- if (list)
- {
- builtin_error (_("too many arguments"));
- top_level_cleanup ();
- jump_to_top_level (DISCARD);
- }
-}
-
-/* Check that no options were given to the currently-executing builtin,
- and return 0 if there were options. */
-int
-no_options (list)
- WORD_LIST *list;
-{
- reset_internal_getopt ();
- if (internal_getopt (list, "") != -1)
- {
- builtin_usage ();
- return (1);
- }
- return (0);
-}
-
-void
-sh_needarg (s)
- char *s;
-{
- builtin_error (_("%s: option requires an argument"), s);
-}
-
-void
-sh_neednumarg (s)
- char *s;
-{
- builtin_error (_("%s: numeric argument required"), s);
-}
-
-void
-sh_notfound (s)
- char *s;
-{
- builtin_error (_("%s: not found"), s);
-}
-
-/* Function called when one of the builtin commands detects an invalid
- option. */
-void
-sh_invalidopt (s)
- char *s;
-{
- builtin_error (_("%s: invalid option"), s);
-}
-
-void
-sh_invalidoptname (s)
- char *s;
-{
- builtin_error (_("%s: invalid option name"), s);
-}
-
-void
-sh_invalidid (s)
- char *s;
-{
- builtin_error (_("`%s': not a valid identifier"), s);
-}
-
-void
-sh_invalidnum (s)
- char *s;
-{
- char *msg;
-
- if (*s == '0' && isdigit (s[1]))
- msg = _("invalid octal number");
- else if (*s == '0' && s[1] == 'x')
- msg = _("invalid hex number");
- else
- msg = _("invalid number");
- builtin_error ("%s: %s", s, msg);
-}
-
-void
-sh_invalidsig (s)
- char *s;
-{
- builtin_error (_("%s: invalid signal specification"), s);
-}
-
-void
-sh_badpid (s)
- char *s;
-{
- builtin_error (_("`%s': not a pid or valid job spec"), s);
-}
-
-void
-sh_readonly (s)
- const char *s;
-{
- builtin_error (_("%s: readonly variable"), s);
-}
-
-void
-sh_erange (s, desc)
- char *s, *desc;
-{
- if (s)
- builtin_error (_("%s: %s out of range"), s, desc ? desc : _("argument"));
- else
- builtin_error (_("%s out of range"), desc ? desc : _("argument"));
-}
-
-#if defined (JOB_CONTROL)
-void
-sh_badjob (s)
- char *s;
-{
- builtin_error (_("%s: no such job"), s);
-}
-
-void
-sh_nojobs (s)
- char *s;
-{
- if (s)
- builtin_error (_("%s: no job control"), s);
- else
- builtin_error (_("no job control"));
-}
-#endif
-
-#if defined (RESTRICTED_SHELL)
-void
-sh_restricted (s)
- char *s;
-{
- if (s)
- builtin_error (_("%s: restricted"), s);
- else
- builtin_error (_("restricted"));
-}
-#endif
-
-void
-sh_notbuiltin (s)
- char *s;
-{
- builtin_error (_("%s: not a shell builtin"), s);
-}
-
-void
-sh_wrerror ()
-{
-#if defined (DONT_REPORT_BROKEN_PIPE_WRITE_ERRORS) && defined (EPIPE)
- if (errno != EPIPE)
-#endif /* DONT_REPORT_BROKEN_PIPE_WRITE_ERRORS && EPIPE */
- builtin_error (_("write error: %s"), strerror (errno));
-}
-
-void
-sh_ttyerror (set)
- int set;
-{
- if (set)
- builtin_error (_("error setting terminal attributes: %s"), strerror (errno));
- else
- builtin_error (_("error getting terminal attributes: %s"), strerror (errno));
-}
-
-int
-sh_chkwrite (s)
- int s;
-{
- fflush (stdout);
- if (ferror (stdout))
- {
- sh_wrerror ();
- fpurge (stdout);
- clearerr (stdout);
- return (EXECUTION_FAILURE);
- }
- return (s);
-}
-
-/* **************************************************************** */
-/* */
-/* Shell positional parameter manipulation */
-/* */
-/* **************************************************************** */
-
-/* Convert a WORD_LIST into a C-style argv. Return the number of elements
- in the list in *IP, if IP is non-null. A convenience function for
- loadable builtins; also used by `test'. */
-char **
-make_builtin_argv (list, ip)
- WORD_LIST *list;
- int *ip;
-{
- char **argv;
-
- argv = strvec_from_word_list (list, 0, 1, ip);
- argv[0] = this_command_name;
- return argv;
-}
-
-/* Remember LIST in $1 ... $9, and REST_OF_ARGS. If DESTRUCTIVE is
- non-zero, then discard whatever the existing arguments are, else
- only discard the ones that are to be replaced. */
-void
-remember_args (list, destructive)
- WORD_LIST *list;
- int destructive;
-{
- register int i;
-
- for (i = 1; i < 10; i++)
- {
- if ((destructive || list) && dollar_vars[i])
- {
- free (dollar_vars[i]);
- dollar_vars[i] = (char *)NULL;
- }
-
- if (list)
- {
- dollar_vars[i] = savestring (list->word->word);
- list = list->next;
- }
- }
-
- /* If arguments remain, assign them to REST_OF_ARGS.
- Note that copy_word_list (NULL) returns NULL, and
- that dispose_words (NULL) does nothing. */
- if (destructive || list)
- {
- dispose_words (rest_of_args);
- rest_of_args = copy_word_list (list);
- }
-
- if (destructive)
- set_dollar_vars_changed ();
-}
-
-static int changed_dollar_vars;
-
-/* Have the dollar variables been reset to new values since we last
- checked? */
-int
-dollar_vars_changed ()
-{
- return (changed_dollar_vars);
-}
-
-void
-set_dollar_vars_unchanged ()
-{
- changed_dollar_vars = 0;
-}
-
-void
-set_dollar_vars_changed ()
-{
- if (variable_context)
- changed_dollar_vars |= ARGS_FUNC;
- else if (this_shell_builtin == set_builtin)
- changed_dollar_vars |= ARGS_SETBLTIN;
- else
- changed_dollar_vars |= ARGS_INVOC;
-}
-
-/* **************************************************************** */
-/* */
-/* Validating numeric input and arguments */
-/* */
-/* **************************************************************** */
-
-/* Read a numeric arg for this_command_name, the name of the shell builtin
- that wants it. LIST is the word list that the arg is to come from.
- Accept only the numeric argument; report an error if other arguments
- follow. If FATAL is 1, call throw_to_top_level, which exits the
- shell; if it's 2, call jump_to_top_level (DISCARD), which aborts the
- current command; if FATAL is 0, return an indication of an invalid
- number by setting *NUMOK == 0 and return -1. */
-int
-get_numeric_arg (list, fatal, count)
- WORD_LIST *list;
- int fatal;
- intmax_t *count;
-{
- char *arg;
-
- if (count)
- *count = 1;
-
- if (list && list->word && ISOPTION (list->word->word, '-'))
- list = list->next;
-
- if (list)
- {
- arg = list->word->word;
- if (arg == 0 || (legal_number (arg, count) == 0))
- {
- sh_neednumarg (list->word->word ? list->word->word : "`'");
- if (fatal == 0)
- return 0;
- else if (fatal == 1) /* fatal == 1; abort */
- throw_to_top_level ();
- else /* fatal == 2; discard current command */
- {
- top_level_cleanup ();
- jump_to_top_level (DISCARD);
- }
- }
- no_args (list->next);
- }
-
- return (1);
-}
-
-/* Get an eight-bit status value from LIST */
-int
-get_exitstat (list)
- WORD_LIST *list;
-{
- int status;
- intmax_t sval;
- char *arg;
-
- if (list && list->word && ISOPTION (list->word->word, '-'))
- list = list->next;
-
- if (list == 0)
- {
- /* If we're not running the DEBUG trap, the return builtin, when not
- given any arguments, uses the value of $? before the trap ran. If
- given an argument, return uses it. This means that the trap can't
- change $?. The DEBUG trap gets to change $?, though, since that is
- part of its reason for existing, and because the extended debug mode
- does things with the return value. */
- if (this_shell_builtin == return_builtin && running_trap > 0 && running_trap != DEBUG_TRAP+1)
- return (trap_saved_exit_value);
- return (last_command_exit_value);
- }
-
- arg = list->word->word;
- if (arg == 0 || legal_number (arg, &sval) == 0)
- {
- sh_neednumarg (list->word->word ? list->word->word : "`'");
- return EX_BADUSAGE;
- }
- no_args (list->next);
-
- status = sval & 255;
- return status;
-}
-
-/* Return the octal number parsed from STRING, or -1 to indicate
- that the string contained a bad number. */
-int
-read_octal (string)
- char *string;
-{
- int result, digits;
-
- result = digits = 0;
- while (*string && ISOCTAL (*string))
- {
- digits++;
- result = (result * 8) + (*string++ - '0');
- if (result > 0777)
- return -1;
- }
-
- if (digits == 0 || *string)
- result = -1;
-
- return (result);
-}
-
-/* **************************************************************** */
-/* */
-/* Manipulating the current working directory */
-/* */
-/* **************************************************************** */
-
-/* Return a consed string which is the current working directory.
- FOR_WHOM is the name of the caller for error printing. */
-char *the_current_working_directory = (char *)NULL;
-
-char *
-get_working_directory (for_whom)
- char *for_whom;
-{
- if (no_symbolic_links)
- {
- FREE (the_current_working_directory);
- the_current_working_directory = (char *)NULL;
- }
-
- if (the_current_working_directory == 0)
- {
-#if defined (GETCWD_BROKEN)
- the_current_working_directory = getcwd (0, PATH_MAX);
-#else
- the_current_working_directory = getcwd (0, 0);
-#endif
- if (the_current_working_directory == 0)
- {
- fprintf (stderr, _("%s: error retrieving current directory: %s: %s\n"),
- (for_whom && *for_whom) ? for_whom : get_name_for_error (),
- _(bash_getcwd_errstr), strerror (errno));
- return (char *)NULL;
- }
- }
-
- return (savestring (the_current_working_directory));
-}
-
-/* Make NAME our internal idea of the current working directory. */
-void
-set_working_directory (name)
- char *name;
-{
- FREE (the_current_working_directory);
- the_current_working_directory = savestring (name);
-}
-
-/* **************************************************************** */
-/* */
-/* Job control support functions */
-/* */
-/* **************************************************************** */
-
-#if defined (JOB_CONTROL)
-int
-get_job_by_name (name, flags)
- const char *name;
- int flags;
-{
- register int i, wl, cl, match, job;
- register PROCESS *p;
- register JOB *j;
-
- job = NO_JOB;
- wl = strlen (name);
- for (i = js.j_jobslots - 1; i >= 0; i--)
- {
- j = get_job_by_jid (i);
- if (j == 0 || ((flags & JM_STOPPED) && J_JOBSTATE(j) != JSTOPPED))
- continue;
-
- p = j->pipe;
- do
- {
- if (flags & JM_EXACT)
- {
- cl = strlen (p->command);
- match = STREQN (p->command, name, cl);
- }
- else if (flags & JM_SUBSTRING)
- match = strcasestr (p->command, name) != (char *)0;
- else
- match = STREQN (p->command, name, wl);
-
- if (match == 0)
- {
- p = p->next;
- continue;
- }
- else if (flags & JM_FIRSTMATCH)
- return i; /* return first match */
- else if (job != NO_JOB)
- {
- if (this_shell_builtin)
- builtin_error (_("%s: ambiguous job spec"), name);
- else
- internal_error (_("%s: ambiguous job spec"), name);
- return (DUP_JOB);
- }
- else
- job = i;
- }
- while (p != j->pipe);
- }
-
- return (job);
-}
-
-/* Return the job spec found in LIST. */
-int
-get_job_spec (list)
- WORD_LIST *list;
-{
- register char *word;
- int job, jflags;
-
- if (list == 0)
- return (js.j_current);
-
- word = list->word->word;
-
- if (*word == '\0')
- return (NO_JOB);
-
- if (*word == '%')
- word++;
-
- if (DIGIT (*word) && all_digits (word))
- {
- job = atoi (word);
- return (job > js.j_jobslots ? NO_JOB : job - 1);
- }
-
- jflags = 0;
- switch (*word)
- {
- case 0:
- case '%':
- case '+':
- return (js.j_current);
-
- case '-':
- return (js.j_previous);
-
- case '?': /* Substring search requested. */
- jflags |= JM_SUBSTRING;
- word++;
- /* FALLTHROUGH */
-
- default:
- return get_job_by_name (word, jflags);
- }
-}
-#endif /* JOB_CONTROL */
-
-/*
- * NOTE: `kill' calls this function with forcecols == 0
- */
-int
-display_signal_list (list, forcecols)
- WORD_LIST *list;
- int forcecols;
-{
- register int i, column;
- char *name;
- int result, signum, dflags;
- intmax_t lsignum;
-
- result = EXECUTION_SUCCESS;
- if (!list)
- {
- for (i = 1, column = 0; i < NSIG; i++)
- {
- name = signal_name (i);
- if (STREQN (name, "SIGJUNK", 7) || STREQN (name, "Unknown", 7))
- continue;
-
- if (posixly_correct && !forcecols)
- {
- /* This is for the kill builtin. POSIX.2 says the signal names
- are displayed without the `SIG' prefix. */
- if (STREQN (name, "SIG", 3))
- name += 3;
- printf ("%s%s", name, (i == NSIG - 1) ? "" : " ");
- }
- else
- {
- printf ("%2d) %s", i, name);
-
- if (++column < 5)
- printf ("\t");
- else
- {
- printf ("\n");
- column = 0;
- }
- }
- }
-
- if ((posixly_correct && !forcecols) || column != 0)
- printf ("\n");
- return result;
- }
-
- /* List individual signal names or numbers. */
- while (list)
- {
- if (legal_number (list->word->word, &lsignum))
- {
- /* This is specified by Posix.2 so that exit statuses can be
- mapped into signal numbers. */
- if (lsignum > 128)
- lsignum -= 128;
- if (lsignum < 0 || lsignum >= NSIG)
- {
- sh_invalidsig (list->word->word);
- result = EXECUTION_FAILURE;
- list = list->next;
- continue;
- }
-
- signum = lsignum;
- name = signal_name (signum);
- if (STREQN (name, "SIGJUNK", 7) || STREQN (name, "Unknown", 7))
- {
- list = list->next;
- continue;
- }
-#if defined (JOB_CONTROL)
- /* POSIX.2 says that `kill -l signum' prints the signal name without
- the `SIG' prefix. */
- printf ("%s\n", (this_shell_builtin == kill_builtin) ? name + 3 : name);
-#else
- printf ("%s\n", name);
-#endif
- }
- else
- {
- dflags = DSIG_NOCASE;
- if (posixly_correct == 0 || this_shell_builtin != kill_builtin)
- dflags |= DSIG_SIGPREFIX;
- signum = decode_signal (list->word->word, dflags);
- if (signum == NO_SIG)
- {
- sh_invalidsig (list->word->word);
- result = EXECUTION_FAILURE;
- list = list->next;
- continue;
- }
- printf ("%d\n", signum);
- }
- list = list->next;
- }
- return (result);
-}
-
-/* **************************************************************** */
-/* */
-/* Finding builtin commands and their functions */
-/* */
-/* **************************************************************** */
-
-/* Perform a binary search and return the address of the builtin function
- whose name is NAME. If the function couldn't be found, or the builtin
- is disabled or has no function associated with it, return NULL.
- Return the address of the builtin.
- DISABLED_OKAY means find it even if the builtin is disabled. */
-struct builtin *
-builtin_address_internal (name, disabled_okay)
- char *name;
- int disabled_okay;
-{
- int hi, lo, mid, j;
-
- hi = num_shell_builtins - 1;
- lo = 0;
-
- while (lo <= hi)
- {
- mid = (lo + hi) / 2;
-
- j = shell_builtins[mid].name[0] - name[0];
-
- if (j == 0)
- j = strcmp (shell_builtins[mid].name, name);
-
- if (j == 0)
- {
- /* It must have a function pointer. It must be enabled, or we
- must have explicitly allowed disabled functions to be found,
- and it must not have been deleted. */
- if (shell_builtins[mid].function &&
- ((shell_builtins[mid].flags & BUILTIN_DELETED) == 0) &&
- ((shell_builtins[mid].flags & BUILTIN_ENABLED) || disabled_okay))
- return (&shell_builtins[mid]);
- else
- return ((struct builtin *)NULL);
- }
- if (j > 0)
- hi = mid - 1;
- else
- lo = mid + 1;
- }
- return ((struct builtin *)NULL);
-}
-
-/* Return the pointer to the function implementing builtin command NAME. */
-sh_builtin_func_t *
-find_shell_builtin (name)
- char *name;
-{
- current_builtin = builtin_address_internal (name, 0);
- return (current_builtin ? current_builtin->function : (sh_builtin_func_t *)NULL);
-}
-
-/* Return the address of builtin with NAME, whether it is enabled or not. */
-sh_builtin_func_t *
-builtin_address (name)
- char *name;
-{
- current_builtin = builtin_address_internal (name, 1);
- return (current_builtin ? current_builtin->function : (sh_builtin_func_t *)NULL);
-}
-
-/* Return the function implementing the builtin NAME, but only if it is a
- POSIX.2 special builtin. */
-sh_builtin_func_t *
-find_special_builtin (name)
- char *name;
-{
- current_builtin = builtin_address_internal (name, 0);
- return ((current_builtin && (current_builtin->flags & SPECIAL_BUILTIN)) ?
- current_builtin->function :
- (sh_builtin_func_t *)NULL);
-}
-
-static int
-shell_builtin_compare (sbp1, sbp2)
- struct builtin *sbp1, *sbp2;
-{
- int result;
-
- if ((result = sbp1->name[0] - sbp2->name[0]) == 0)
- result = strcmp (sbp1->name, sbp2->name);
-
- return (result);
-}
-
-/* Sort the table of shell builtins so that the binary search will work
- in find_shell_builtin. */
-void
-initialize_shell_builtins ()
-{
- qsort (shell_builtins, num_shell_builtins, sizeof (struct builtin),
- (QSFUNC *)shell_builtin_compare);
-}
+++ /dev/null
-/* common.h -- extern declarations for functions defined in common.c. */
-
-/* Copyright (C) 1993-2010 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#if !defined (__COMMON_H)
-# define __COMMON_H
-
-#include "stdc.h"
-
-#define ISOPTION(s, c) (s[0] == '-' && !s[2] && s[1] == c)
-#define ISHELP(s) (STREQ ((s), "--help"))
-
-#define CHECK_HELPOPT(l) \
-do { \
- if ((l) && (l)->word && ISHELP((l)->word->word)) \
- { \
- builtin_help (); \
- return (EX_USAGE); \
- } \
-} while (0)
-
-/* Flag values for parse_and_execute () */
-#define SEVAL_NONINT 0x001
-#define SEVAL_INTERACT 0x002
-#define SEVAL_NOHIST 0x004
-#define SEVAL_NOFREE 0x008
-#define SEVAL_RESETLINE 0x010
-#define SEVAL_PARSEONLY 0x020
-#define SEVAL_NOLONGJMP 0x040
-
-/* Flags for describe_command, shared between type.def and command.def */
-#define CDESC_ALL 0x001 /* type -a */
-#define CDESC_SHORTDESC 0x002 /* command -V */
-#define CDESC_REUSABLE 0x004 /* command -v */
-#define CDESC_TYPE 0x008 /* type -t */
-#define CDESC_PATH_ONLY 0x010 /* type -p */
-#define CDESC_FORCE_PATH 0x020 /* type -ap or type -P */
-#define CDESC_NOFUNCS 0x040 /* type -f */
-#define CDESC_ABSPATH 0x080 /* convert to absolute path, no ./ */
-
-/* Flags for get_job_by_name */
-#define JM_PREFIX 0x01 /* prefix of job name */
-#define JM_SUBSTRING 0x02 /* substring of job name */
-#define JM_EXACT 0x04 /* match job name exactly */
-#define JM_STOPPED 0x08 /* match stopped jobs only */
-#define JM_FIRSTMATCH 0x10 /* return first matching job */
-
-/* Flags for remember_args and value of changed_dollar_vars */
-#define ARGS_NONE 0x0
-#define ARGS_INVOC 0x01
-#define ARGS_FUNC 0x02
-#define ARGS_SETBLTIN 0x04
-
-/* Functions from common.c */
-extern void builtin_error __P((const char *, ...)) __attribute__((__format__ (printf, 1, 2)));
-extern void builtin_warning __P((const char *, ...)) __attribute__((__format__ (printf, 1, 2)));
-extern void builtin_usage __P((void));
-extern void no_args __P((WORD_LIST *));
-extern int no_options __P((WORD_LIST *));
-
-/* common error message functions */
-extern void sh_needarg __P((char *));
-extern void sh_neednumarg __P((char *));
-extern void sh_notfound __P((char *));
-extern void sh_invalidopt __P((char *));
-extern void sh_invalidoptname __P((char *));
-extern void sh_invalidid __P((char *));
-extern void sh_invalidnum __P((char *));
-extern void sh_invalidsig __P((char *));
-extern void sh_erange __P((char *, char *));
-extern void sh_badpid __P((char *));
-extern void sh_badjob __P((char *));
-extern void sh_readonly __P((const char *));
-extern void sh_nojobs __P((char *));
-extern void sh_restricted __P((char *));
-extern void sh_notbuiltin __P((char *));
-extern void sh_wrerror __P((void));
-extern void sh_ttyerror __P((int));
-extern int sh_chkwrite __P((int));
-
-extern char **make_builtin_argv __P((WORD_LIST *, int *));
-extern void remember_args __P((WORD_LIST *, int));
-
-extern int dollar_vars_changed __P((void));
-extern void set_dollar_vars_unchanged __P((void));
-extern void set_dollar_vars_changed __P((void));
-
-extern int get_numeric_arg __P((WORD_LIST *, int, intmax_t *));
-extern int get_exitstat __P((WORD_LIST *));
-extern int read_octal __P((char *));
-
-/* Keeps track of the current working directory. */
-extern char *the_current_working_directory;
-extern char *get_working_directory __P((char *));
-extern void set_working_directory __P((char *));
-
-#if defined (JOB_CONTROL)
-extern int get_job_by_name __P((const char *, int));
-extern int get_job_spec __P((WORD_LIST *));
-#endif
-extern int display_signal_list __P((WORD_LIST *, int));
-
-/* It's OK to declare a function as returning a Function * without
- providing a definition of what a `Function' is. */
-extern struct builtin *builtin_address_internal __P((char *, int));
-extern sh_builtin_func_t *find_shell_builtin __P((char *));
-extern sh_builtin_func_t *builtin_address __P((char *));
-extern sh_builtin_func_t *find_special_builtin __P((char *));
-extern void initialize_shell_builtins __P((void));
-
-/* Functions from exit.def */
-extern void bash_logout __P((void));
-
-/* Functions from getopts.def */
-extern void getopts_reset __P((int));
-
-/* Functions from help.def */
-extern void builtin_help __P((void));
-
-/* Functions from set.def */
-extern int minus_o_option_value __P((char *));
-extern void list_minus_o_opts __P((int, int));
-extern char **get_minus_o_opts __P((void));
-extern int set_minus_o_option __P((int, char *));
-
-extern void set_shellopts __P((void));
-extern void parse_shellopts __P((char *));
-extern void initialize_shell_options __P((int));
-
-extern void reset_shell_options __P((void));
-
-/* Functions from shopt.def */
-extern void reset_shopt_options __P((void));
-extern char **get_shopt_options __P((void));
-
-extern int shopt_setopt __P((char *, int));
-extern int shopt_listopt __P((char *, int));
-
-extern int set_login_shell __P((char *, int));
-
-extern void set_bashopts __P((void));
-extern void parse_bashopts __P((char *));
-extern void initialize_bashopts __P((int));
-
-extern void set_compatibility_opts __P((void));
-
-/* Functions from type.def */
-extern int describe_command __P((char *, int));
-
-/* Functions from setattr.def */
-extern int set_or_show_attributes __P((WORD_LIST *, int, int));
-extern int show_all_var_attributes __P((int, int));
-extern int show_var_attributes __P((SHELL_VAR *, int, int));
-extern int show_name_attributes __P((char *, int));
-extern int show_func_attributes __P((char *, int));
-extern void set_var_attribute __P((char *, int, int));
-
-/* Functions from pushd.def */
-extern char *get_dirstack_from_string __P((char *));
-extern char *get_dirstack_element __P((intmax_t, int));
-extern void set_dirstack_element __P((intmax_t, int, char *));
-extern WORD_LIST *get_directory_stack __P((int));
-
-/* Functions from evalstring.c */
-extern int parse_and_execute __P((char *, const char *, int));
-extern int evalstring __P((char *, const char *, int));
-extern void parse_and_execute_cleanup __P((void));
-extern int parse_string __P((char *, const char *, int, char **));
-
-/* Functions from evalfile.c */
-extern int maybe_execute_file __P((const char *, int));
-extern int source_file __P((const char *, int));
-extern int fc_execute_file __P((const char *));
-
-#endif /* !__COMMON_H */
+++ /dev/null
-/* evalstring.c - evaluate a string as one or more shell commands. */
-
-/* Copyright (C) 1996-2012 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include <stdio.h>
-#include <signal.h>
-
-#include <errno.h>
-
-#include "filecntl.h"
-#include "../bashansi.h"
-
-#include "../shell.h"
-#include "../jobs.h"
-#include "../builtins.h"
-#include "../flags.h"
-#include "../input.h"
-#include "../execute_cmd.h"
-#include "../redir.h"
-#include "../trap.h"
-#include "../bashintl.h"
-
-#include <y.tab.h>
-
-#if defined (HISTORY)
-# include "../bashhist.h"
-#endif
-
-#include "common.h"
-#include "builtext.h"
-
-#if !defined (errno)
-extern int errno;
-#endif
-
-#define IS_BUILTIN(s) (builtin_address_internal(s, 0) != (struct builtin *)NULL)
-
-extern int indirection_level, subshell_environment;
-extern int line_number, line_number_for_err_trap;
-extern int current_token, shell_eof_token;
-extern int last_command_exit_value;
-extern int running_trap;
-extern int loop_level;
-extern int executing_list;
-extern int comsub_ignore_return;
-extern int posixly_correct;
-extern int return_catch_flag, return_catch_value;
-extern sh_builtin_func_t *this_shell_builtin;
-extern char *the_printed_command_except_trap;
-
-int parse_and_execute_level = 0;
-
-static int cat_file __P((REDIRECT *));
-
-#define PE_TAG "parse_and_execute top"
-#define PS_TAG "parse_string top"
-
-#if defined (HISTORY)
-static void
-set_history_remembering ()
-{
- remember_on_history = enable_history_list;
-}
-#endif
-
-static void
-restore_lastcom (x)
- char *x;
-{
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = x;
-}
-
-/* How to force parse_and_execute () to clean up after itself. */
-void
-parse_and_execute_cleanup ()
-{
- if (running_trap)
- {
- run_trap_cleanup (running_trap - 1);
- unfreeze_jobs_list ();
- }
-
- if (have_unwind_protects ())
- run_unwind_frame (PE_TAG);
- else
- parse_and_execute_level = 0; /* XXX */
-}
-
-static void
-parse_prologue (string, flags, tag)
- char *string;
- int flags;
- char *tag;
-{
- char *orig_string, *lastcom;
- int x;
-
- orig_string = string;
- /* Unwind protect this invocation of parse_and_execute (). */
- begin_unwind_frame (tag);
- unwind_protect_int (parse_and_execute_level);
- unwind_protect_jmp_buf (top_level);
- unwind_protect_int (indirection_level);
- unwind_protect_int (line_number);
- unwind_protect_int (line_number_for_err_trap);
- unwind_protect_int (loop_level);
- unwind_protect_int (executing_list);
- unwind_protect_int (comsub_ignore_return);
- if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
- unwind_protect_int (interactive);
-
-#if defined (HISTORY)
- if (parse_and_execute_level == 0)
- add_unwind_protect (set_history_remembering, (char *)NULL);
- else
- unwind_protect_int (remember_on_history); /* can be used in scripts */
-# if defined (BANG_HISTORY)
- if (interactive_shell)
- unwind_protect_int (history_expansion_inhibited);
-# endif /* BANG_HISTORY */
-#endif /* HISTORY */
-
- if (interactive_shell)
- {
- x = get_current_prompt_level ();
- add_unwind_protect (set_current_prompt_level, x);
- }
-
- if (the_printed_command_except_trap)
- {
- lastcom = savestring (the_printed_command_except_trap);
- add_unwind_protect (restore_lastcom, lastcom);
- }
-
- add_unwind_protect (pop_stream, (char *)NULL);
- if (parser_expanding_alias ())
- add_unwind_protect (parser_restore_alias, (char *)NULL);
-
- if (orig_string && ((flags & SEVAL_NOFREE) == 0))
- add_unwind_protect (xfree, orig_string);
- end_unwind_frame ();
-
- if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
- interactive = (flags & SEVAL_NONINT) ? 0 : 1;
-
-#if defined (HISTORY)
- if (flags & SEVAL_NOHIST)
- bash_history_disable ();
-#endif /* HISTORY */
-}
-
-/* Parse and execute the commands in STRING. Returns whatever
- execute_command () returns. This frees STRING. FLAGS is a
- flags word; look in common.h for the possible values. Actions
- are:
- (flags & SEVAL_NONINT) -> interactive = 0;
- (flags & SEVAL_INTERACT) -> interactive = 1;
- (flags & SEVAL_NOHIST) -> call bash_history_disable ()
- (flags & SEVAL_NOFREE) -> don't free STRING when finished
- (flags & SEVAL_RESETLINE) -> reset line_number to 1
-*/
-
-int
-parse_and_execute (string, from_file, flags)
- char *string;
- const char *from_file;
- int flags;
-{
- int code, lreset;
- volatile int should_jump_to_top_level, last_result;
- COMMAND *volatile command;
- volatile sigset_t pe_sigmask;
-
- parse_prologue (string, flags, PE_TAG);
-
- parse_and_execute_level++;
-
- lreset = flags & SEVAL_RESETLINE;
-
-#if defined (HAVE_POSIX_SIGNALS)
- /* If we longjmp and are going to go on, use this to restore signal mask */
- sigemptyset (&pe_sigmask);
- sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &pe_sigmask);
-#endif
-
- /* Reset the line number if the caller wants us to. If we don't reset the
- line number, we have to subtract one, because we will add one just
- before executing the next command (resetting the line number sets it to
- 0; the first line number is 1). */
- push_stream (lreset);
- if (parser_expanding_alias ())
- /* push current shell_input_line */
- parser_save_alias ();
-
- if (lreset == 0)
- line_number--;
-
- indirection_level++;
-
- code = should_jump_to_top_level = 0;
- last_result = EXECUTION_SUCCESS;
-
- /* We need to reset enough of the token state so we can start fresh. */
- if (current_token == yacc_EOF)
- current_token = '\n'; /* reset_parser() ? */
-
- with_input_from_string (string, from_file);
- while (*(bash_input.location.string))
- {
- command = (COMMAND *)NULL;
-
- if (interrupt_state)
- {
- last_result = EXECUTION_FAILURE;
- break;
- }
-
- /* Provide a location for functions which `longjmp (top_level)' to
- jump to. This prevents errors in substitution from restarting
- the reader loop directly, for example. */
- code = setjmp_nosigs (top_level);
-
- if (code)
- {
- should_jump_to_top_level = 0;
- switch (code)
- {
- case ERREXIT:
- /* variable_context -> 0 is what eval.c:reader_loop() does in
- these circumstances. Don't bother with cleanup here because
- we don't want to run the function execution cleanup stuff
- that will cause pop_context and other functions to run.
- XXX - change that if we want the function context to be
- unwound. */
- if (exit_immediately_on_error && variable_context)
- {
- discard_unwind_frame ("pe_dispose");
- variable_context = 0; /* not in a function */
- }
- should_jump_to_top_level = 1;
- goto out;
- case FORCE_EOF:
- case EXITPROG:
- if (command)
- run_unwind_frame ("pe_dispose");
- /* Remember to call longjmp (top_level) after the old
- value for it is restored. */
- should_jump_to_top_level = 1;
- goto out;
-
- case DISCARD:
- if (command)
- run_unwind_frame ("pe_dispose");
- last_result = last_command_exit_value = EXECUTION_FAILURE; /* XXX */
- if (subshell_environment)
- {
- should_jump_to_top_level = 1;
- goto out;
- }
- else
- {
-#if 0
- dispose_command (command); /* pe_dispose does this */
-#endif
-#if defined (HAVE_POSIX_SIGNALS)
- sigprocmask (SIG_SETMASK, &pe_sigmask, (sigset_t *)NULL);
-#endif
- continue;
- }
-
- default:
- command_error ("parse_and_execute", CMDERR_BADJUMP, code, 0);
- break;
- }
- }
-
- if (parse_command () == 0)
- {
- if ((flags & SEVAL_PARSEONLY) || (interactive_shell == 0 && read_but_dont_execute))
- {
- last_result = EXECUTION_SUCCESS;
- dispose_command (global_command);
- global_command = (COMMAND *)NULL;
- }
- else if (command = global_command)
- {
- struct fd_bitmap *bitmap;
-
- if ((flags & SEVAL_FUNCDEF) && command->type != cm_function_def)
- {
- internal_warning ("ignoring function definition attempt `%s'", string);
- should_jump_to_top_level = 0;
- last_result = last_command_exit_value = EX_BADUSAGE;
- break;
- }
-
- bitmap = new_fd_bitmap (FD_BITMAP_SIZE);
- begin_unwind_frame ("pe_dispose");
- add_unwind_protect (dispose_fd_bitmap, bitmap);
- add_unwind_protect (dispose_command, command); /* XXX */
-
- global_command = (COMMAND *)NULL;
-
- if ((subshell_environment & SUBSHELL_COMSUB) && comsub_ignore_return)
- command->flags |= CMD_IGNORE_RETURN;
-
-#if defined (ONESHOT)
- /*
- * IF
- * we were invoked as `bash -c' (startup_state == 2) AND
- * parse_and_execute has not been called recursively AND
- * we're not running a trap AND
- * we have parsed the full command (string == '\0') AND
- * we're not going to run the exit trap AND
- * we have a simple command without redirections AND
- * the command is not being timed AND
- * the command's return status is not being inverted
- * THEN
- * tell the execution code that we don't need to fork
- */
- if (startup_state == 2 && parse_and_execute_level == 1 &&
- running_trap == 0 &&
- *bash_input.location.string == '\0' &&
- command->type == cm_simple &&
- signal_is_trapped (EXIT_TRAP) == 0 &&
- command->redirects == 0 && command->value.Simple->redirects == 0 &&
- ((command->flags & CMD_TIME_PIPELINE) == 0) &&
- ((command->flags & CMD_INVERT_RETURN) == 0))
- {
- command->flags |= CMD_NO_FORK;
- command->value.Simple->flags |= CMD_NO_FORK;
- }
-#endif /* ONESHOT */
-
- /* See if this is a candidate for $( <file ). */
- if (startup_state == 2 &&
- (subshell_environment & SUBSHELL_COMSUB) &&
- *bash_input.location.string == '\0' &&
- command->type == cm_simple && !command->redirects &&
- (command->flags & CMD_TIME_PIPELINE) == 0 &&
- command->value.Simple->words == 0 &&
- command->value.Simple->redirects &&
- command->value.Simple->redirects->next == 0 &&
- command->value.Simple->redirects->instruction == r_input_direction &&
- command->value.Simple->redirects->redirector.dest == 0)
- {
- int r;
- r = cat_file (command->value.Simple->redirects);
- last_result = (r < 0) ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
- }
- else
- last_result = execute_command_internal
- (command, 0, NO_PIPE, NO_PIPE, bitmap);
- dispose_command (command);
- dispose_fd_bitmap (bitmap);
- discard_unwind_frame ("pe_dispose");
-
- if (flags & SEVAL_ONECMD)
- break;
- }
- }
- else
- {
- last_result = EXECUTION_FAILURE;
-
- if (interactive_shell == 0 && this_shell_builtin &&
- (this_shell_builtin == source_builtin || this_shell_builtin == eval_builtin) &&
- last_command_exit_value == EX_BADSYNTAX && posixly_correct)
- {
- should_jump_to_top_level = 1;
- code = ERREXIT;
- last_command_exit_value = EX_BADUSAGE;
- }
-
- /* Since we are shell compatible, syntax errors in a script
- abort the execution of the script. Right? */
- break;
- }
- }
-
- out:
-
- run_unwind_frame (PE_TAG);
-
- if (interrupt_state && parse_and_execute_level == 0)
- {
- /* An interrupt during non-interactive execution in an
- interactive shell (e.g. via $PROMPT_COMMAND) should
- not cause the shell to exit. */
- interactive = interactive_shell;
- throw_to_top_level ();
- }
-
- if (should_jump_to_top_level)
- jump_to_top_level (code);
-
- return (last_result);
-}
-
-/* Parse a command contained in STRING according to FLAGS and return the
- number of characters consumed from the string. If non-NULL, set *ENDP
- to the position in the string where the parse ended. Used to validate
- command substitutions during parsing to obey Posix rules about finding
- the end of the command and balancing parens. */
-int
-parse_string (string, from_file, flags, endp)
- char *string;
- const char *from_file;
- int flags;
- char **endp;
-{
- int code, nc;
- volatile int should_jump_to_top_level;
- COMMAND *volatile command, *oglobal;
- char *ostring;
- volatile sigset_t ps_sigmask;
-
- parse_prologue (string, flags, PS_TAG);
-
-#if defined (HAVE_POSIX_SIGNALS)
- /* If we longjmp and are going to go on, use this to restore signal mask */
- sigemptyset (&ps_sigmask);
- sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &ps_sigmask);
-#endif
-
-/* itrace("parse_string: `%s'", string); */
- /* Reset the line number if the caller wants us to. If we don't reset the
- line number, we have to subtract one, because we will add one just
- before executing the next command (resetting the line number sets it to
- 0; the first line number is 1). */
- push_stream (0);
- if (parser_expanding_alias ())
- /* push current shell_input_line */
- parser_save_alias ();
-
- code = should_jump_to_top_level = 0;
- oglobal = global_command;
- ostring = string;
-
- with_input_from_string (string, from_file);
- while (*(bash_input.location.string))
- {
- command = (COMMAND *)NULL;
-
-#if 0
- if (interrupt_state)
- break;
-#endif
-
- /* Provide a location for functions which `longjmp (top_level)' to
- jump to. */
- code = setjmp_nosigs (top_level);
-
- if (code)
- {
-#if defined (DEBUG)
-itrace("parse_string: longjmp executed: code = %d", code);
-#endif
- should_jump_to_top_level = 0;
- switch (code)
- {
- case FORCE_EOF:
- case ERREXIT:
- case EXITPROG:
- case DISCARD: /* XXX */
- if (command)
- dispose_command (command);
- /* Remember to call longjmp (top_level) after the old
- value for it is restored. */
- should_jump_to_top_level = 1;
- goto out;
-
- default:
-#if defined (HAVE_POSIX_SIGNALS)
- sigprocmask (SIG_SETMASK, &ps_sigmask, (sigset_t *)NULL);
-#endif
- command_error ("parse_string", CMDERR_BADJUMP, code, 0);
- break;
- }
- }
-
- if (parse_command () == 0)
- {
- dispose_command (global_command);
- global_command = (COMMAND *)NULL;
- }
- else
- {
- if ((flags & SEVAL_NOLONGJMP) == 0)
- {
- should_jump_to_top_level = 1;
- code = DISCARD;
- }
- else
- reset_parser (); /* XXX - sets token_to_read */
- break;
- }
-
- if (current_token == yacc_EOF || current_token == shell_eof_token)
- break;
- }
-
- out:
-
- global_command = oglobal;
- nc = bash_input.location.string - ostring;
- if (endp)
- *endp = bash_input.location.string;
-
- run_unwind_frame (PS_TAG);
-
- if (should_jump_to_top_level)
- jump_to_top_level (code);
-
- return (nc);
-}
-
-/* Handle a $( < file ) command substitution. This expands the filename,
- returning errors as appropriate, then just cats the file to the standard
- output. */
-static int
-cat_file (r)
- REDIRECT *r;
-{
- char *fn;
- int fd, rval;
-
- if (r->instruction != r_input_direction)
- return -1;
-
- /* Get the filename. */
- if (posixly_correct && !interactive_shell)
- disallow_filename_globbing++;
- fn = redirection_expand (r->redirectee.filename);
- if (posixly_correct && !interactive_shell)
- disallow_filename_globbing--;
-
- if (fn == 0)
- {
- redirection_error (r, AMBIGUOUS_REDIRECT);
- return -1;
- }
-
- fd = open(fn, O_RDONLY);
- if (fd < 0)
- {
- file_error (fn);
- free (fn);
- return -1;
- }
-
- rval = zcatfd (fd, 1, fn);
-
- free (fn);
- close (fd);
-
- return (rval);
-}
-
-int
-evalstring (string, from_file, flags)
- char *string;
- const char *from_file;
- int flags;
-{
- volatile int r, rflag, rcatch;
-
- rcatch = 0;
- rflag = return_catch_flag;
- /* If we are in a place where `return' is valid, we have to catch
- `eval "... return"' and make sure parse_and_execute cleans up. Then
- we can trampoline to the previous saved return_catch location. */
- if (rflag)
- {
- begin_unwind_frame ("evalstring");
-
- unwind_protect_int (return_catch_flag);
- unwind_protect_jmp_buf (return_catch);
-
- return_catch_flag++; /* increment so we have a counter */
- rcatch = setjmp_nosigs (return_catch);
- }
-
- if (rcatch)
- {
- parse_and_execute_cleanup ();
- r = return_catch_value;
- }
- else
- /* Note that parse_and_execute () frees the string it is passed. */
- r = parse_and_execute (string, from_file, flags);
-
- if (rflag)
- {
- run_unwind_frame ("evalstring");
- if (rcatch && return_catch_flag)
- {
- return_catch_value = r;
- longjmp (return_catch, 1);
- }
- }
-
- return (r);
-}
+++ /dev/null
-This file is exit.def, from which is created exit.c.
-It implements the builtins "exit", and "logout" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES exit.c
-
-$BUILTIN exit
-$FUNCTION exit_builtin
-$SHORT_DOC exit [n]
-Exit the shell.
-
-Exits the shell with a status of N. If N is omitted, the exit status
-is that of the last command executed.
-$END
-
-#include <config.h>
-
-#include "../bashtypes.h"
-#include <stdio.h>
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "../jobs.h"
-
-#include "common.h"
-#include "builtext.h" /* for jobs_builtin */
-
-extern int check_jobs_at_exit;
-extern int last_command_exit_value;
-extern int running_trap, trap_saved_exit_value;
-extern int subshell_environment;
-extern sh_builtin_func_t *this_shell_builtin;
-extern sh_builtin_func_t *last_shell_builtin;
-
-static int exit_or_logout __P((WORD_LIST *));
-static int sourced_logout;
-
-int
-exit_builtin (list)
- WORD_LIST *list;
-{
- if (interactive)
- {
- fprintf (stderr, login_shell ? _("logout\n") : "exit\n");
- fflush (stderr);
- }
-
- return (exit_or_logout (list));
-}
-
-$BUILTIN logout
-$FUNCTION logout_builtin
-$SHORT_DOC logout [n]
-Exit a login shell.
-
-Exits a login shell with exit status N. Returns an error if not executed
-in a login shell.
-$END
-
-/* How to logout. */
-int
-logout_builtin (list)
- WORD_LIST *list;
-{
- if (login_shell == 0 /* && interactive */)
- {
- builtin_error (_("not login shell: use `exit'"));
- return (EXECUTION_FAILURE);
- }
- else
- return (exit_or_logout (list));
-}
-
-static int
-exit_or_logout (list)
- WORD_LIST *list;
-{
- int exit_value;
-
-#if defined (JOB_CONTROL)
- int exit_immediate_okay, stopmsg;
-
- exit_immediate_okay = (interactive == 0 ||
- last_shell_builtin == exit_builtin ||
- last_shell_builtin == logout_builtin ||
- last_shell_builtin == jobs_builtin);
-
- /* Check for stopped jobs if the user wants to. */
- if (exit_immediate_okay == 0)
- {
- register int i;
- for (i = stopmsg = 0; i < js.j_jobslots; i++)
- if (jobs[i] && STOPPED (i))
- stopmsg = JSTOPPED;
- else if (check_jobs_at_exit && stopmsg == 0 && jobs[i] && RUNNING (i))
- stopmsg = JRUNNING;
-
- if (stopmsg == JSTOPPED)
- fprintf (stderr, _("There are stopped jobs.\n"));
- else if (stopmsg == JRUNNING)
- fprintf (stderr, _("There are running jobs.\n"));
-
- if (stopmsg && check_jobs_at_exit)
- list_all_jobs (JLIST_STANDARD);
-
- if (stopmsg)
- {
- /* This is NOT superfluous because EOF can get here without
- going through the command parser. Set both last and this
- so that either `exit', `logout', or ^D will work to exit
- immediately if nothing intervenes. */
- this_shell_builtin = last_shell_builtin = exit_builtin;
- return (EXECUTION_FAILURE);
- }
- }
-#endif /* JOB_CONTROL */
-
- /* Get return value if present. This means that you can type
- `logout 5' to a shell, and it returns 5. */
-
- /* If we're running the exit trap (running_trap == 1, since running_trap
- gets set to SIG+1), and we don't have a argument given to `exit'
- (list == 0), use the exit status we saved before running the trap
- commands (trap_saved_exit_value). */
- exit_value = (running_trap == 1 && list == 0) ? trap_saved_exit_value : get_exitstat (list);
-
- bash_logout ();
-
- last_command_exit_value = exit_value;
-
- /* Exit the program. */
- jump_to_top_level (EXITPROG);
- /*NOTREACHED*/
-}
-
-void
-bash_logout ()
-{
- /* Run our `~/.bash_logout' file if it exists, and this is a login shell. */
- if (login_shell && sourced_logout++ == 0 && subshell_environment == 0)
- {
- maybe_execute_file ("~/.bash_logout", 1);
-#ifdef SYS_BASH_LOGOUT
- maybe_execute_file (SYS_BASH_LOGOUT, 1);
-#endif
- }
-}
+++ /dev/null
-This file is fg_bg.def, from which is created fg_bg.c.
-It implements the builtins "bg" and "fg" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES fg_bg.c
-
-$BUILTIN fg
-$FUNCTION fg_builtin
-$DEPENDS_ON JOB_CONTROL
-$SHORT_DOC fg [job_spec]
-Move job to the foreground.
-
-Place the job identified by JOB_SPEC in the foreground, making it the
-current job. If JOB_SPEC is not present, the shell's notion of the
-current job is used.
-
-Exit Status:
-Status of command placed in foreground, or failure if an error occurs.
-$END
-
-#include <config.h>
-
-#include "../bashtypes.h"
-#include <signal.h>
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "../jobs.h"
-#include "common.h"
-#include "bashgetopt.h"
-
-#if defined (JOB_CONTROL)
-extern char *this_command_name;
-
-static int fg_bg __P((WORD_LIST *, int));
-
-/* How to bring a job into the foreground. */
-int
-fg_builtin (list)
- WORD_LIST *list;
-{
- int fg_bit;
- register WORD_LIST *t;
-
- CHECK_HELPOPT (list);
-
- if (job_control == 0)
- {
- sh_nojobs ((char *)NULL);
- return (EXECUTION_FAILURE);
- }
-
- if (no_options (list))
- return (EX_USAGE);
- list = loptend;
-
- /* If the last arg on the line is '&', then start this job in the
- background. Else, fg the job. */
- for (t = list; t && t->next; t = t->next)
- ;
- fg_bit = (t && t->word->word[0] == '&' && t->word->word[1] == '\0') == 0;
-
- return (fg_bg (list, fg_bit));
-}
-#endif /* JOB_CONTROL */
-
-$BUILTIN bg
-$FUNCTION bg_builtin
-$DEPENDS_ON JOB_CONTROL
-$SHORT_DOC bg [job_spec ...]
-Move jobs to the background.
-
-Place the jobs identified by each JOB_SPEC in the background, as if they
-had been started with `&'. If JOB_SPEC is not present, the shell's notion
-of the current job is used.
-
-Exit Status:
-Returns success unless job control is not enabled or an error occurs.
-$END
-
-#if defined (JOB_CONTROL)
-/* How to put a job into the background. */
-int
-bg_builtin (list)
- WORD_LIST *list;
-{
- int r;
-
- if (list && list->word && ISHELP (list->word->word))
- {
- builtin_help ();
- return (EX_USAGE);
- }
-
- if (job_control == 0)
- {
- sh_nojobs ((char *)NULL);
- return (EXECUTION_FAILURE);
- }
-
- if (no_options (list))
- return (EX_USAGE);
- list = loptend;
-
- /* This relies on the fact that fg_bg() takes a WORD_LIST *, but only acts
- on the first member (if any) of that list. */
- r = EXECUTION_SUCCESS;
- do
- {
- if (fg_bg (list, 0) == EXECUTION_FAILURE)
- r = EXECUTION_FAILURE;
- if (list)
- list = list->next;
- }
- while (list);
-
- return r;
-}
-
-/* How to put a job into the foreground/background. */
-static int
-fg_bg (list, foreground)
- WORD_LIST *list;
- int foreground;
-{
- sigset_t set, oset;
- int job, status, old_async_pid;
- JOB *j;
-
- BLOCK_CHILD (set, oset);
- job = get_job_spec (list);
-
- if (INVALID_JOB (job))
- {
- if (job != DUP_JOB)
- sh_badjob (list ? list->word->word : _("current"));
-
- goto failure;
- }
-
- j = get_job_by_jid (job);
- /* Or if j->pgrp == shell_pgrp. */
- if (IS_JOBCONTROL (job) == 0)
- {
- builtin_error (_("job %d started without job control"), job + 1);
- goto failure;
- }
-
- if (foreground == 0)
- {
- old_async_pid = last_asynchronous_pid;
- last_asynchronous_pid = j->pgrp; /* As per Posix.2 5.4.2 */
- }
-
- status = start_job (job, foreground);
-
- if (status >= 0)
- {
- /* win: */
- UNBLOCK_CHILD (oset);
- return (foreground ? status : EXECUTION_SUCCESS);
- }
- else
- {
- if (foreground == 0)
- last_asynchronous_pid = old_async_pid;
-
- failure:
- UNBLOCK_CHILD (oset);
- return (EXECUTION_FAILURE);
- }
-}
-#endif /* JOB_CONTROL */
+++ /dev/null
-/* getopt.h - declarations for getopt. */
-
-/* Copyright (C) 1989, 1990, 1991, 1992, 1993, 2008,2009 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/* XXX THIS HAS BEEN MODIFIED FOR INCORPORATION INTO BASH XXX */
-
-#ifndef _SH_GETOPT_H
-#define _SH_GETOPT_H 1
-
-#include "stdc.h"
-
-#define GETOPT_EOF -1
-#define GETOPT_HELP -99
-
-/* For communication from `getopt' to the caller.
- When `getopt' finds an option that takes an argument,
- the argument value is returned here.
- Also, when `ordering' is RETURN_IN_ORDER,
- each non-option ARGV-element is returned here. */
-
-extern char *sh_optarg;
-
-/* Index in ARGV of the next element to be scanned.
- This is used for communication to and from the caller
- and for communication between successive calls to `getopt'.
-
- On entry to `getopt', zero means this is the first call; initialize.
-
- When `getopt' returns EOF, this is the index of the first of the
- non-option elements that the caller should itself scan.
-
- Otherwise, `sh_optind' communicates from one call to the next
- how much of ARGV has been scanned so far. */
-
-extern int sh_optind;
-
-/* Callers store zero here to inhibit the error message `getopt' prints
- for unrecognized options. */
-
-extern int sh_opterr;
-
-/* Set to an option character which was unrecognized. */
-
-extern int sh_optopt;
-
-/* Set to 1 when an unrecognized option is encountered. */
-extern int sh_badopt;
-
-extern int sh_getopt __P((int, char *const *, const char *));
-extern void sh_getopt_restore_state __P((char **));
-
-#endif /* _SH_GETOPT_H */
+++ /dev/null
-This file is help.def, from which is created help.c.
-It implements the builtin "help" in Bash.
-
-Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES help.c
-
-$BUILTIN help
-$FUNCTION help_builtin
-$DEPENDS_ON HELP_BUILTIN
-$SHORT_DOC help [-dms] [pattern ...]
-Display information about builtin commands.
-
-Displays brief summaries of builtin commands. If PATTERN is
-specified, gives detailed help on all commands matching PATTERN,
-otherwise the list of help topics is printed.
-
-Options:
- -d output short description for each topic
- -m display usage in pseudo-manpage format
- -s output only a short usage synopsis for each topic matching
- PATTERN
-
-Arguments:
- PATTERN Pattern specifiying a help topic
-
-Exit Status:
-Returns success unless PATTERN is not found or an invalid option is given.
-$END
-
-#include <config.h>
-
-#if defined (HELP_BUILTIN)
-#include <stdio.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include <errno.h>
-
-#include <filecntl.h>
-#include <stddef.h>
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "../builtins.h"
-#include "../pathexp.h"
-#include "common.h"
-#include "bashgetopt.h"
-
-#include <glob/strmatch.h>
-#include <glob/glob.h>
-
-#ifndef errno
-extern int errno;
-#endif
-
-extern const char * const bash_copyright;
-extern const char * const bash_license;
-
-extern char *this_command_name;
-extern struct builtin *current_builtin;
-
-static void show_builtin_command_help __P((void));
-static int open_helpfile __P((char *));
-static void show_desc __P((char *, int));
-static void show_manpage __P((char *, int));
-static void show_longdoc __P((int));
-
-/* Print out a list of the known functions in the shell, and what they do.
- If LIST is supplied, print out the list which matches for each pattern
- specified. */
-int
-help_builtin (list)
- WORD_LIST *list;
-{
- register int i;
- char *pattern, *name;
- int plen, match_found, sflag, dflag, mflag, m, pass, this_found;
-
- dflag = sflag = mflag = 0;
- reset_internal_getopt ();
- while ((i = internal_getopt (list, "dms")) != -1)
- {
- switch (i)
- {
- case 'd':
- dflag = 1;
- break;
- case 'm':
- mflag = 1;
- break;
- case 's':
- sflag = 1;
- break;
- default:
- builtin_usage ();
- return (EX_USAGE);
- }
- }
- list = loptend;
-
- if (list == 0)
- {
- show_shell_version (0);
- show_builtin_command_help ();
- return (EXECUTION_SUCCESS);
- }
-
- /* We should consider making `help bash' do something. */
-
- if (glob_pattern_p (list->word->word))
- {
- printf (ngettext ("Shell commands matching keyword `", "Shell commands matching keywords `", (list->next ? 2 : 1)));
- print_word_list (list, ", ");
- printf ("'\n\n");
- }
-
- for (match_found = 0, pattern = ""; list; list = list->next)
- {
- pattern = list->word->word;
- plen = strlen (pattern);
-
- for (pass = 1, this_found = 0; pass < 3; pass++)
- {
- for (i = 0; name = shell_builtins[i].name; i++)
- {
- QUIT;
-
- /* First pass: look for exact string or pattern matches.
- Second pass: look for prefix matches like bash-4.2 */
- if (pass == 1)
- m = (strcmp (pattern, name) == 0) ||
- (strmatch (pattern, name, FNMATCH_EXTFLAG) != FNM_NOMATCH);
- else
- m = strncmp (pattern, name, plen) == 0;
-
- if (m)
- {
- this_found = 1;
- match_found++;
- if (dflag)
- {
- show_desc (name, i);
- continue;
- }
- else if (mflag)
- {
- show_manpage (name, i);
- continue;
- }
-
- printf ("%s: %s\n", name, _(shell_builtins[i].short_doc));
-
- if (sflag == 0)
- show_longdoc (i);
- }
- }
- if (pass == 1 && this_found == 1)
- break;
- }
- }
-
- if (match_found == 0)
- {
- builtin_error (_("no help topics match `%s'. Try `help help' or `man -k %s' or `info %s'."), pattern, pattern, pattern);
- return (EXECUTION_FAILURE);
- }
-
- fflush (stdout);
- return (EXECUTION_SUCCESS);
-}
-
-void
-builtin_help ()
-{
- int ind;
- ptrdiff_t d;
-
-itrace("builtin_help: this_command_name = %s", this_command_name);
-
- current_builtin = builtin_address_internal (this_command_name, 0);
- if (current_builtin == 0)
- return;
-
- d = current_builtin - shell_builtins;
-itrace("builtin_help: current_builtin = %p diff = %d", current_builtin, (int)d);
-
- ind = (int)d;
-
- printf ("%s: %s\n", this_command_name, _(shell_builtins[ind].short_doc));
- show_longdoc (ind);
-}
-
-static int
-open_helpfile (name)
- char *name;
-{
- int fd;
-
- fd = open (name, O_RDONLY);
- if (fd == -1)
- {
- builtin_error (_("%s: cannot open: %s"), name, strerror (errno));
- return -1;
- }
- return fd;
-}
-
-/* By convention, enforced by mkbuiltins.c, if separate help files are being
- used, the long_doc array contains one string -- the full pathname of the
- help file for this builtin. */
-static void
-show_longdoc (i)
- int i;
-{
- register int j;
- char * const *doc;
- int fd;
-
- doc = shell_builtins[i].long_doc;
-
- if (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL)
- {
- fd = open_helpfile (doc[0]);
- if (fd < 0)
- return;
- zcatfd (fd, 1, doc[0]);
- close (fd);
- }
- else if (doc)
- for (j = 0; doc[j]; j++)
- printf ("%*s%s\n", BASE_INDENT, " ", _(doc[j]));
-}
-
-static void
-show_desc (name, i)
- char *name;
- int i;
-{
- register int j;
- char **doc, *line;
- int fd, usefile;
-
- doc = (char **)shell_builtins[i].long_doc;
-
- usefile = (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL);
- if (usefile)
- {
- fd = open_helpfile (doc[0]);
- if (fd < 0)
- return;
- zmapfd (fd, &line, doc[0]);
- close (fd);
- }
- else
- line = doc ? doc[0] : (char *)NULL;
-
- printf ("%s - ", name);
- for (j = 0; line && line[j]; j++)
- {
- putchar (line[j]);
- if (line[j] == '\n')
- break;
- }
-
- fflush (stdout);
-
- if (usefile)
- free (line);
-}
-
-/* Print builtin help in pseudo-manpage format. */
-static void
-show_manpage (name, i)
- char *name;
- int i;
-{
- register int j;
- char **doc, *line;
- int fd, usefile;
-
- doc = (char **)shell_builtins[i].long_doc;
-
- usefile = (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL);
- if (usefile)
- {
- fd = open_helpfile (doc[0]);
- if (fd < 0)
- return;
- zmapfd (fd, &line, doc[0]);
- close (fd);
- }
- else
- line = doc ? _(doc[0]) : (char *)NULL;
-
- /* NAME */
- printf ("NAME\n");
- printf ("%*s%s - ", BASE_INDENT, " ", name);
- for (j = 0; line && line[j]; j++)
- {
- putchar (line[j]);
- if (line[j] == '\n')
- break;
- }
- printf ("\n");
-
- /* SYNOPSIS */
- printf ("SYNOPSIS\n");
- printf ("%*s%s\n\n", BASE_INDENT, " ", _(shell_builtins[i].short_doc));
-
- /* DESCRIPTION */
- printf ("DESCRIPTION\n");
- if (usefile == 0)
- {
- for (j = 0; doc[j]; j++)
- printf ("%*s%s\n", BASE_INDENT, " ", _(doc[j]));
- }
- else
- {
- for (j = 0; line && line[j]; j++)
- {
- putchar (line[j]);
- if (line[j] == '\n')
- printf ("%*s", BASE_INDENT, " ");
- }
- }
- putchar ('\n');
-
- /* SEE ALSO */
- printf ("SEE ALSO\n");
- printf ("%*sbash(1)\n\n", BASE_INDENT, " ");
-
- /* IMPLEMENTATION */
- printf ("IMPLEMENTATION\n");
- printf ("%*s", BASE_INDENT, " ");
- show_shell_version (0);
- printf ("%*s", BASE_INDENT, " ");
- printf ("%s\n", _(bash_copyright));
- printf ("%*s", BASE_INDENT, " ");
- printf ("%s\n", _(bash_license));
-
- fflush (stdout);
- if (usefile)
- free (line);
-}
-
-static void
-dispcolumn (i, buf, bufsize, width, height)
- int i;
- char *buf;
- size_t bufsize;
- int width, height;
-{
- int j;
- int displen;
- char *helpdoc;
-
- /* first column */
- helpdoc = _(shell_builtins[i].short_doc);
-
- buf[0] = (shell_builtins[i].flags & BUILTIN_ENABLED) ? ' ' : '*';
- strncpy (buf + 1, helpdoc, width - 2);
- buf[width - 2] = '>'; /* indicate truncation */
- buf[width - 1] = '\0';
- printf ("%s", buf);
- if (((i << 1) >= num_shell_builtins) || (i+height >= num_shell_builtins))
- {
- printf ("\n");
- return;
- }
-
- displen = strlen (buf);
- /* two spaces */
- for (j = displen; j < width; j++)
- putc (' ', stdout);
-
- /* second column */
- helpdoc = _(shell_builtins[i+height].short_doc);
-
- buf[0] = (shell_builtins[i+height].flags & BUILTIN_ENABLED) ? ' ' : '*';
- strncpy (buf + 1, helpdoc, width - 3);
- buf[width - 3] = '>'; /* indicate truncation */
- buf[width - 2] = '\0';
-
- printf ("%s\n", buf);
-}
-
-#if defined (HANDLE_MULTIBYTE)
-static void
-wdispcolumn (i, buf, bufsize, width, height)
- int i;
- char *buf;
- size_t bufsize;
- int width, height;
-{
- int j;
- int displen;
- char *helpdoc;
- wchar_t *wcstr;
- size_t slen, n;
- int wclen;
-
- /* first column */
- helpdoc = _(shell_builtins[i].short_doc);
-
- wcstr = 0;
- slen = mbstowcs ((wchar_t *)0, helpdoc, 0);
- if (slen == -1)
- {
- dispcolumn (i, buf, bufsize, width, height);
- return;
- }
-
- /* No bigger than the passed max width */
- if (slen >= width)
- slen = width - 2;
- wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (width + 2));
- n = mbstowcs (wcstr+1, helpdoc, slen + 1);
- wcstr[n+1] = L'\0';
-
- /* Turn tabs and newlines into spaces for column display, since wcwidth
- returns -1 for them */
- for (j = 1; j < n; j++)
- if (wcstr[j] == L'\n' || wcstr[j] == L'\t')
- wcstr[j] = L' ';
-
- displen = wcsnwidth (wcstr+1, slen, width - 2) + 1; /* +1 for ' ' or '*' */
-
- wcstr[0] = (shell_builtins[i].flags & BUILTIN_ENABLED) ? L' ' : L'*';
-
- /* This assumes each wide char takes up one column position when displayed */
- wcstr[width - 2] = L'>'; /* indicate truncation */
- wcstr[width - 1] = L'\0';
-
- printf ("%ls", wcstr);
- if (((i << 1) >= num_shell_builtins) || (i+height >= num_shell_builtins))
- {
- printf ("\n");
- free (wcstr);
- return;
- }
-
- /* at least one space */
- for (j = displen; j < width; j++)
- putc (' ', stdout);
-
- /* second column */
- helpdoc = _(shell_builtins[i+height].short_doc);
- slen = mbstowcs ((wchar_t *)0, helpdoc, 0);
- if (slen == -1)
- {
- /* for now */
- printf ("%c%s\n", (shell_builtins[i+height].flags & BUILTIN_ENABLED) ? ' ' : '*', helpdoc);
- free (wcstr);
- return;
- }
-
- /* Reuse wcstr since it is already width wide chars long */
- if (slen >= width)
- slen = width - 2;
- n = mbstowcs (wcstr+1, helpdoc, slen + 1);
- wcstr[n+1] = L'\0'; /* make sure null-terminated */
-
- /* Turn tabs and newlines into spaces for column display */
- for (j = 1; j < n; j++)
- if (wcstr[j] == L'\n' || wcstr[j] == L'\t')
- wcstr[j] = L' ';
-
- displen = wcsnwidth (wcstr+1, slen, width - 2);
-
- wcstr[0] = (shell_builtins[i+height].flags & BUILTIN_ENABLED) ? L' ' : L'*';
-
- /* This assumes each wide char takes up one column position when displayed */
- wcstr[width - 3] = L'>'; /* indicate truncation */
- wcstr[width - 2] = L'\0';
-
- printf ("%ls\n", wcstr);
-
- free (wcstr);
-}
-#endif /* HANDLE_MULTIBYTE */
-
-static void
-show_builtin_command_help ()
-{
- int i, j;
- int height, width;
- char *t, blurb[128];
-
- printf (
-_("These shell commands are defined internally. Type `help' to see this list.\n\
-Type `help name' to find out more about the function `name'.\n\
-Use `info bash' to find out more about the shell in general.\n\
-Use `man -k' or `info' to find out more about commands not in this list.\n\
-\n\
-A star (*) next to a name means that the command is disabled.\n\
-\n"));
-
- t = get_string_value ("COLUMNS");
- width = (t && *t) ? atoi (t) : 80;
- if (width <= 0)
- width = 80;
-
- width /= 2;
- if (width > sizeof (blurb))
- width = sizeof (blurb);
- if (width <= 3)
- width = 40;
- height = (num_shell_builtins + 1) / 2; /* number of rows */
-
- for (i = 0; i < height; i++)
- {
- QUIT;
-
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1)
- wdispcolumn (i, blurb, sizeof (blurb), width, height);
- else
-#endif
- dispcolumn (i, blurb, sizeof (blurb), width, height);
- }
-}
-#endif /* HELP_BUILTIN */
+++ /dev/null
-This file is kill.def, from which is created kill.c.
-It implements the builtin "kill" in Bash.
-
-Copyright (C) 1987-2010 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES kill.c
-
-$BUILTIN kill
-$FUNCTION kill_builtin
-$SHORT_DOC kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
-Send a signal to a job.
-
-Send the processes identified by PID or JOBSPEC the signal named by
-SIGSPEC or SIGNUM. If neither SIGSPEC nor SIGNUM is present, then
-SIGTERM is assumed.
-
-Options:
- -s sig SIG is a signal name
- -n sig SIG is a signal number
- -l list the signal names; if arguments follow `-l' they are
- assumed to be signal numbers for which names should be listed
-
-Kill is a shell builtin for two reasons: it allows job IDs to be used
-instead of process IDs, and allows processes to be killed if the limit
-on processes that you can create is reached.
-
-Exit Status:
-Returns success unless an invalid option is given or an error occurs.
-$END
-
-#include <config.h>
-
-#include <stdio.h>
-#include <errno.h>
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashansi.h"
-#include "../bashintl.h"
-
-#include <signal.h>
-
-#include "../shell.h"
-#include "../trap.h"
-#include "../jobs.h"
-#include "common.h"
-
-/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-extern int posixly_correct;
-
-static void kill_error __P((pid_t, int));
-
-#if !defined (CONTINUE_AFTER_KILL_ERROR)
-# define CONTINUE_OR_FAIL return (EXECUTION_FAILURE)
-#else
-# define CONTINUE_OR_FAIL goto continue_killing
-#endif /* CONTINUE_AFTER_KILL_ERROR */
-
-/* Here is the kill builtin. We only have it so that people can type
- kill -KILL %1? No, if you fill up the process table this way you
- can still kill some. */
-int
-kill_builtin (list)
- WORD_LIST *list;
-{
- int sig, any_succeeded, listing, saw_signal, dflags;
- char *sigspec, *word;
- pid_t pid;
- intmax_t pid_value;
-
- if (list == 0)
- {
- builtin_usage ();
- return (EX_USAGE);
- }
-
- any_succeeded = listing = saw_signal = 0;
- sig = SIGTERM;
- sigspec = "TERM";
-
- dflags = DSIG_NOCASE | ((posixly_correct == 0) ? DSIG_SIGPREFIX : 0);
- /* Process options. */
- while (list)
- {
- word = list->word->word;
-
- if (ISOPTION (word, 'l'))
- {
- listing++;
- list = list->next;
- }
- else if (ISOPTION (word, 's') || ISOPTION (word, 'n'))
- {
- list = list->next;
- if (list)
- {
- sigspec = list->word->word;
- if (sigspec[0] == '0' && sigspec[1] == '\0')
- sig = 0;
- else
- sig = decode_signal (sigspec, dflags);
- list = list->next;
- saw_signal++;
- }
- else
- {
- sh_needarg (word);
- return (EXECUTION_FAILURE);
- }
- }
- else if (ISOPTION (word, '-'))
- {
- list = list->next;
- break;
- }
- else if (ISHELP (word))
- {
- builtin_help ();
- return (EX_USAGE);
- }
- else if (ISOPTION (word, '?'))
- {
- builtin_usage ();
- return (EX_USAGE);
- }
- /* If this is a signal specification then process it. We only process
- the first one seen; other arguments may signify process groups (e.g,
- -num == process group num). */
- else if (*word == '-' && saw_signal == 0)
- {
- sigspec = word + 1;
- sig = decode_signal (sigspec, dflags);
- saw_signal++;
- list = list->next;
- }
- else
- break;
- }
-
- if (listing)
- return (display_signal_list (list, 0));
-
- /* OK, we are killing processes. */
- if (sig == NO_SIG)
- {
- sh_invalidsig (sigspec);
- return (EXECUTION_FAILURE);
- }
-
- if (list == 0)
- {
- builtin_usage ();
- return (EX_USAGE);
- }
-
- while (list)
- {
- word = list->word->word;
-
- if (*word == '-')
- word++;
-
- /* Use the entire argument in case of minus sign presence. */
- if (*word && legal_number (list->word->word, &pid_value) && (pid_value == (pid_t)pid_value))
- {
- pid = (pid_t) pid_value;
-
- if (kill_pid (pid, sig, pid < -1) < 0)
- {
- if (errno == EINVAL)
- sh_invalidsig (sigspec);
- else
- kill_error (pid, errno);
- CONTINUE_OR_FAIL;
- }
- else
- any_succeeded++;
- }
-#if defined (JOB_CONTROL)
- else if (*list->word->word && *list->word->word != '%')
- {
- builtin_error (_("%s: arguments must be process or job IDs"), list->word->word);
- CONTINUE_OR_FAIL;
- }
- else if (*word)
- /* Posix.2 says you can kill without job control active (4.32.4) */
- { /* Must be a job spec. Check it out. */
- int job;
- sigset_t set, oset;
- JOB *j;
-
- BLOCK_CHILD (set, oset);
- job = get_job_spec (list);
-
- if (INVALID_JOB (job))
- {
- if (job != DUP_JOB)
- sh_badjob (list->word->word);
- UNBLOCK_CHILD (oset);
- CONTINUE_OR_FAIL;
- }
-
- j = get_job_by_jid (job);
- /* Job spec used. Kill the process group. If the job was started
- without job control, then its pgrp == shell_pgrp, so we have
- to be careful. We take the pid of the first job in the pipeline
- in that case. */
- pid = IS_JOBCONTROL (job) ? j->pgrp : j->pipe->pid;
-
- UNBLOCK_CHILD (oset);
-
- if (kill_pid (pid, sig, 1) < 0)
- {
- if (errno == EINVAL)
- sh_invalidsig (sigspec);
- else
- kill_error (pid, errno);
- CONTINUE_OR_FAIL;
- }
- else
- any_succeeded++;
- }
-#endif /* !JOB_CONTROL */
- else
- {
- sh_badpid (list->word->word);
- CONTINUE_OR_FAIL;
- }
- continue_killing:
- list = list->next;
- }
-
- return (any_succeeded ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
-}
-
-static void
-kill_error (pid, e)
- pid_t pid;
- int e;
-{
- char *x;
-
- x = strerror (e);
- if (x == 0)
- x = _("Unknown error");
- builtin_error ("(%ld) - %s", (long)pid, x);
-}
+++ /dev/null
-This file is let.def, from which is created let.c.
-It implements the builtin "let" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$BUILTIN let
-$FUNCTION let_builtin
-$PRODUCES let.c
-$SHORT_DOC let arg [arg ...]
-Evaluate arithmetic expressions.
-
-Evaluate each ARG as an arithmetic expression. Evaluation is done in
-fixed-width integers with no check for overflow, though division by 0
-is trapped and flagged as an error. The following list of operators is
-grouped into levels of equal-precedence operators. The levels are listed
-in order of decreasing precedence.
-
- id++, id-- variable post-increment, post-decrement
- ++id, --id variable pre-increment, pre-decrement
- -, + unary minus, plus
- !, ~ logical and bitwise negation
- ** exponentiation
- *, /, % multiplication, division, remainder
- +, - addition, subtraction
- <<, >> left and right bitwise shifts
- <=, >=, <, > comparison
- ==, != equality, inequality
- & bitwise AND
- ^ bitwise XOR
- | bitwise OR
- && logical AND
- || logical OR
- expr ? expr : expr
- conditional operator
- =, *=, /=, %=,
- +=, -=, <<=, >>=,
- &=, ^=, |= assignment
-
-Shell variables are allowed as operands. The name of the variable
-is replaced by its value (coerced to a fixed-width integer) within
-an expression. The variable need not have its integer attribute
-turned on to be used in an expression.
-
-Operators are evaluated in order of precedence. Sub-expressions in
-parentheses are evaluated first and may override the precedence
-rules above.
-
-Exit Status:
-If the last ARG evaluates to 0, let returns 1; let returns 0 otherwise.
-$END
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "common.h"
-
-/* Arithmetic LET function. */
-int
-let_builtin (list)
- WORD_LIST *list;
-{
- intmax_t ret;
- int expok;
-
- if (list && list->word && ISHELP (list->word->word))
- {
- builtin_help ();
- return (EX_USAGE);
- }
-
- /* Skip over leading `--' argument. */
- if (list && list->word && ISOPTION (list->word->word, '-'))
- list = list->next;
-
- if (list == 0)
- {
- builtin_error (_("expression expected"));
- return (EXECUTION_FAILURE);
- }
-
- for (; list; list = list->next)
- {
- ret = evalexp (list->word->word, &expok);
- if (expok == 0)
- return (EXECUTION_FAILURE);
- }
-
- return ((ret == 0) ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
-}
-
-#ifdef INCLUDE_UNUSED
-int
-exp_builtin (list)
- WORD_LIST *list;
-{
- char *exp;
- intmax_t ret;
- int expok;
-
- if (list == 0)
- {
- builtin_error (_("expression expected"));
- return (EXECUTION_FAILURE);
- }
-
- exp = string_list (list);
- ret = evalexp (exp, &expok);
- (void)free (exp);
- return (((ret == 0) || (expok == 0)) ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
-}
-#endif
+++ /dev/null
-This file is pushd.def, from which is created pushd.c. It implements the
-builtins "pushd", "popd", and "dirs" in Bash.
-
-Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES pushd.c
-
-$BUILTIN pushd
-$FUNCTION pushd_builtin
-$DEPENDS_ON PUSHD_AND_POPD
-$SHORT_DOC pushd [-n] [+N | -N | dir]
-Add directories to stack.
-
-Adds a directory to the top of the directory stack, or rotates
-the stack, making the new top of the stack the current working
-directory. With no arguments, exchanges the top two directories.
-
-Options:
- -n Suppresses the normal change of directory when adding
- directories to the stack, so only the stack is manipulated.
-
-Arguments:
- +N Rotates the stack so that the Nth directory (counting
- from the left of the list shown by `dirs', starting with
- zero) is at the top.
-
- -N Rotates the stack so that the Nth directory (counting
- from the right of the list shown by `dirs', starting with
- zero) is at the top.
-
- dir Adds DIR to the directory stack at the top, making it the
- new current working directory.
-
-The `dirs' builtin displays the directory stack.
-
-Exit Status:
-Returns success unless an invalid argument is supplied or the directory
-change fails.
-$END
-
-$BUILTIN popd
-$FUNCTION popd_builtin
-$DEPENDS_ON PUSHD_AND_POPD
-$SHORT_DOC popd [-n] [+N | -N]
-Remove directories from stack.
-
-Removes entries from the directory stack. With no arguments, removes
-the top directory from the stack, and changes to the new top directory.
-
-Options:
- -n Suppresses the normal change of directory when removing
- directories from the stack, so only the stack is manipulated.
-
-Arguments:
- +N Removes the Nth entry counting from the left of the list
- shown by `dirs', starting with zero. For example: `popd +0'
- removes the first directory, `popd +1' the second.
-
- -N Removes the Nth entry counting from the right of the list
- shown by `dirs', starting with zero. For example: `popd -0'
- removes the last directory, `popd -1' the next to last.
-
-The `dirs' builtin displays the directory stack.
-
-Exit Status:
-Returns success unless an invalid argument is supplied or the directory
-change fails.
-$END
-
-$BUILTIN dirs
-$FUNCTION dirs_builtin
-$DEPENDS_ON PUSHD_AND_POPD
-$SHORT_DOC dirs [-clpv] [+N] [-N]
-Display directory stack.
-
-Display the list of currently remembered directories. Directories
-find their way onto the list with the `pushd' command; you can get
-back up through the list with the `popd' command.
-
-Options:
- -c clear the directory stack by deleting all of the elements
- -l do not print tilde-prefixed versions of directories relative
- to your home directory
- -p print the directory stack with one entry per line
- -v print the directory stack with one entry per line prefixed
- with its position in the stack
-
-Arguments:
- +N Displays the Nth entry counting from the left of the list shown by
- dirs when invoked without options, starting with zero.
-
- -N Displays the Nth entry counting from the right of the list shown by
- dirs when invoked without options, starting with zero.
-
-Exit Status:
-Returns success unless an invalid option is supplied or an error occurs.
-$END
-
-#include <config.h>
-
-#if defined (PUSHD_AND_POPD)
-#include <stdio.h>
-#if defined (HAVE_SYS_PARAM_H)
-# include <sys/param.h>
-#endif
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashansi.h"
-#include "../bashintl.h"
-
-#include <errno.h>
-
-#include <tilde/tilde.h>
-
-#include "../shell.h"
-#include "maxpath.h"
-#include "common.h"
-#include "builtext.h"
-
-#ifdef LOADABLE_BUILTIN
-# include "builtins.h"
-#endif
-
-#if !defined (errno)
-extern int errno;
-#endif /* !errno */
-
-/* The list of remembered directories. */
-static char **pushd_directory_list = (char **)NULL;
-
-/* Number of existing slots in this list. */
-static int directory_list_size;
-
-/* Offset to the end of the list. */
-static int directory_list_offset;
-
-static void pushd_error __P((int, char *));
-static void clear_directory_stack __P((void));
-static int cd_to_string __P((char *));
-static int change_to_temp __P((char *));
-static void add_dirstack_element __P((char *));
-static int get_dirstack_index __P((intmax_t, int, int *));
-
-#define NOCD 0x01
-#define ROTATE 0x02
-#define LONGFORM 0x04
-#define CLEARSTAK 0x08
-
-int
-pushd_builtin (list)
- WORD_LIST *list;
-{
- WORD_LIST *orig_list;
- char *temp, *current_directory, *top;
- int j, flags, skipopt;
- intmax_t num;
- char direction;
-
- orig_list = list;
-
- CHECK_HELPOPT (list);
- if (list && list->word && ISOPTION (list->word->word, '-'))
- {
- list = list->next;
- skipopt = 1;
- }
- else
- skipopt = 0;
-
- /* If there is no argument list then switch current and
- top of list. */
- if (list == 0)
- {
- if (directory_list_offset == 0)
- {
- builtin_error (_("no other directory"));
- return (EXECUTION_FAILURE);
- }
-
- current_directory = get_working_directory ("pushd");
- if (current_directory == 0)
- return (EXECUTION_FAILURE);
-
- j = directory_list_offset - 1;
- temp = pushd_directory_list[j];
- pushd_directory_list[j] = current_directory;
- j = change_to_temp (temp);
- free (temp);
- return j;
- }
-
- for (flags = 0; skipopt == 0 && list; list = list->next)
- {
- if (ISOPTION (list->word->word, 'n'))
- {
- flags |= NOCD;
- }
- else if (ISOPTION (list->word->word, '-'))
- {
- list = list->next;
- break;
- }
- else if (list->word->word[0] == '-' && list->word->word[1] == '\0')
- /* Let `pushd -' work like it used to. */
- break;
- else if (((direction = list->word->word[0]) == '+') || direction == '-')
- {
- if (legal_number (list->word->word + 1, &num) == 0)
- {
- sh_invalidnum (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
-
- if (direction == '-')
- num = directory_list_offset - num;
-
- if (num > directory_list_offset || num < 0)
- {
- pushd_error (directory_list_offset, list->word->word);
- return (EXECUTION_FAILURE);
- }
- flags |= ROTATE;
- }
- else if (*list->word->word == '-')
- {
- sh_invalidopt (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- else
- break;
- }
-
- if (flags & ROTATE)
- {
- /* Rotate the stack num times. Remember, the current
- directory acts like it is part of the stack. */
- temp = get_working_directory ("pushd");
-
- if (num == 0)
- {
- j = ((flags & NOCD) == 0) ? change_to_temp (temp) : EXECUTION_SUCCESS;
- free (temp);
- return j;
- }
-
- do
- {
- top = pushd_directory_list[directory_list_offset - 1];
-
- for (j = directory_list_offset - 2; j > -1; j--)
- pushd_directory_list[j + 1] = pushd_directory_list[j];
-
- pushd_directory_list[j + 1] = temp;
-
- temp = top;
- num--;
- }
- while (num);
-
- j = ((flags & NOCD) == 0) ? change_to_temp (temp) : EXECUTION_SUCCESS;
- free (temp);
- return j;
- }
-
- if (list == 0)
- return (EXECUTION_SUCCESS);
-
- /* Change to the directory in list->word->word. Save the current
- directory on the top of the stack. */
- current_directory = get_working_directory ("pushd");
- if (current_directory == 0)
- return (EXECUTION_FAILURE);
-
- j = ((flags & NOCD) == 0) ? cd_builtin (skipopt ? orig_list : list) : EXECUTION_SUCCESS;
- if (j == EXECUTION_SUCCESS)
- {
- add_dirstack_element ((flags & NOCD) ? savestring (list->word->word) : current_directory);
- dirs_builtin ((WORD_LIST *)NULL);
- if (flags & NOCD)
- free (current_directory);
- return (EXECUTION_SUCCESS);
- }
- else
- {
- free (current_directory);
- return (EXECUTION_FAILURE);
- }
-}
-
-/* Pop the directory stack, and then change to the new top of the stack.
- If LIST is non-null it should consist of a word +N or -N, which says
- what element to delete from the stack. The default is the top one. */
-int
-popd_builtin (list)
- WORD_LIST *list;
-{
- register int i;
- intmax_t which;
- int flags;
- char direction;
- char *which_word;
-
- CHECK_HELPOPT (list);
-
- which_word = (char *)NULL;
- for (flags = 0, which = 0, direction = '+'; list; list = list->next)
- {
- if (ISOPTION (list->word->word, 'n'))
- {
- flags |= NOCD;
- }
- else if (ISOPTION (list->word->word, '-'))
- {
- list = list->next;
- break;
- }
- else if (((direction = list->word->word[0]) == '+') || direction == '-')
- {
- if (legal_number (list->word->word + 1, &which) == 0)
- {
- sh_invalidnum (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- which_word = list->word->word;
- }
- else if (*list->word->word == '-')
- {
- sh_invalidopt (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- else if (*list->word->word)
- {
- builtin_error (_("%s: invalid argument"), list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- else
- break;
- }
-
- if (which > directory_list_offset || (directory_list_offset == 0 && which == 0))
- {
- pushd_error (directory_list_offset, which_word ? which_word : "");
- return (EXECUTION_FAILURE);
- }
-
- /* Handle case of no specification, or top of stack specification. */
- if ((direction == '+' && which == 0) ||
- (direction == '-' && which == directory_list_offset))
- {
- i = ((flags & NOCD) == 0) ? cd_to_string (pushd_directory_list[directory_list_offset - 1])
- : EXECUTION_SUCCESS;
- if (i != EXECUTION_SUCCESS)
- return (i);
- free (pushd_directory_list[--directory_list_offset]);
- }
- else
- {
- /* Since an offset other than the top directory was specified,
- remove that directory from the list and shift the remainder
- of the list into place. */
- i = (direction == '+') ? directory_list_offset - which : which;
- free (pushd_directory_list[i]);
- directory_list_offset--;
-
- /* Shift the remainder of the list into place. */
- for (; i < directory_list_offset; i++)
- pushd_directory_list[i] = pushd_directory_list[i + 1];
- }
-
- dirs_builtin ((WORD_LIST *)NULL);
- return (EXECUTION_SUCCESS);
-}
-
-/* Print the current list of directories on the directory stack. */
-int
-dirs_builtin (list)
- WORD_LIST *list;
-{
- int flags, desired_index, index_flag, vflag;
- intmax_t i;
- char *temp, *w;
-
- if (list && list->word && ISHELP (list->word->word))
- {
- builtin_help ();
- return (EX_USAGE);
- }
- for (flags = vflag = index_flag = 0, desired_index = -1, w = ""; list; list = list->next)
- {
- if (ISOPTION (list->word->word, 'l'))
- {
- flags |= LONGFORM;
- }
- else if (ISOPTION (list->word->word, 'c'))
- {
- flags |= CLEARSTAK;
- }
- else if (ISOPTION (list->word->word, 'v'))
- {
- vflag |= 2;
- }
- else if (ISOPTION (list->word->word, 'p'))
- {
- vflag |= 1;
- }
- else if (ISOPTION (list->word->word, '-'))
- {
- list = list->next;
- break;
- }
- else if (*list->word->word == '+' || *list->word->word == '-')
- {
- int sign;
- if (legal_number (w = list->word->word + 1, &i) == 0)
- {
- sh_invalidnum (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- sign = (*list->word->word == '+') ? 1 : -1;
- desired_index = get_dirstack_index (i, sign, &index_flag);
- }
- else
- {
- sh_invalidopt (list->word->word);
- builtin_usage ();
- return (EX_USAGE);
- }
- }
-
- if (flags & CLEARSTAK)
- {
- clear_directory_stack ();
- return (EXECUTION_SUCCESS);
- }
-
- if (index_flag && (desired_index < 0 || desired_index > directory_list_offset))
- {
- pushd_error (directory_list_offset, w);
- return (EXECUTION_FAILURE);
- }
-
-#define DIRSTACK_FORMAT(temp) \
- (flags & LONGFORM) ? temp : polite_directory_format (temp)
-
- /* The first directory printed is always the current working directory. */
- if (index_flag == 0 || (index_flag == 1 && desired_index == 0))
- {
- temp = get_working_directory ("dirs");
- if (temp == 0)
- temp = savestring (_("<no current directory>"));
- if (vflag & 2)
- printf ("%2d %s", 0, DIRSTACK_FORMAT (temp));
- else
- printf ("%s", DIRSTACK_FORMAT (temp));
- free (temp);
- if (index_flag)
- {
- putchar ('\n');
- return (sh_chkwrite (EXECUTION_SUCCESS));
- }
- }
-
-#define DIRSTACK_ENTRY(i) \
- (flags & LONGFORM) ? pushd_directory_list[i] \
- : polite_directory_format (pushd_directory_list[i])
-
- /* Now print the requested directory stack entries. */
- if (index_flag)
- {
- if (vflag & 2)
- printf ("%2d %s", directory_list_offset - desired_index,
- DIRSTACK_ENTRY (desired_index));
- else
- printf ("%s", DIRSTACK_ENTRY (desired_index));
- }
- else
- for (i = directory_list_offset - 1; i >= 0; i--)
- if (vflag >= 2)
- printf ("\n%2d %s", directory_list_offset - (int)i, DIRSTACK_ENTRY (i));
- else
- printf ("%s%s", (vflag & 1) ? "\n" : " ", DIRSTACK_ENTRY (i));
-
- putchar ('\n');
-
- return (sh_chkwrite (EXECUTION_SUCCESS));
-}
-
-static void
-pushd_error (offset, arg)
- int offset;
- char *arg;
-{
- if (offset == 0)
- builtin_error (_("directory stack empty"));
- else
- sh_erange (arg, _("directory stack index"));
-}
-
-static void
-clear_directory_stack ()
-{
- register int i;
-
- for (i = 0; i < directory_list_offset; i++)
- free (pushd_directory_list[i]);
- directory_list_offset = 0;
-}
-
-/* Switch to the directory in NAME. This uses the cd_builtin to do the work,
- so if the result is EXECUTION_FAILURE then an error message has already
- been printed. */
-static int
-cd_to_string (name)
- char *name;
-{
- WORD_LIST *tlist;
- WORD_LIST *dir;
- int result;
-
- dir = make_word_list (make_word (name), NULL);
- tlist = make_word_list (make_word ("--"), dir);
- result = cd_builtin (tlist);
- dispose_words (tlist);
- return (result);
-}
-
-static int
-change_to_temp (temp)
- char *temp;
-{
- int tt;
-
- tt = temp ? cd_to_string (temp) : EXECUTION_FAILURE;
-
- if (tt == EXECUTION_SUCCESS)
- dirs_builtin ((WORD_LIST *)NULL);
-
- return (tt);
-}
-
-static void
-add_dirstack_element (dir)
- char *dir;
-{
- if (directory_list_offset == directory_list_size)
- pushd_directory_list = strvec_resize (pushd_directory_list, directory_list_size += 10);
- pushd_directory_list[directory_list_offset++] = dir;
-}
-
-static int
-get_dirstack_index (ind, sign, indexp)
- intmax_t ind;
- int sign, *indexp;
-{
- if (indexp)
- *indexp = sign > 0 ? 1 : 2;
-
- /* dirs +0 prints the current working directory. */
- /* dirs -0 prints last element in directory stack */
- if (ind == 0 && sign > 0)
- return 0;
- else if (ind == directory_list_offset)
- {
- if (indexp)
- *indexp = sign > 0 ? 2 : 1;
- return 0;
- }
- else if (ind >= 0 && ind <= directory_list_offset)
- return (sign > 0 ? directory_list_offset - ind : ind);
- else
- return -1;
-}
-
-/* Used by the tilde expansion code. */
-char *
-get_dirstack_from_string (string)
- char *string;
-{
- int ind, sign, index_flag;
- intmax_t i;
-
- sign = 1;
- if (*string == '-' || *string == '+')
- {
- sign = (*string == '-') ? -1 : 1;
- string++;
- }
- if (legal_number (string, &i) == 0)
- return ((char *)NULL);
-
- index_flag = 0;
- ind = get_dirstack_index (i, sign, &index_flag);
- if (index_flag && (ind < 0 || ind > directory_list_offset))
- return ((char *)NULL);
- if (index_flag == 0 || (index_flag == 1 && ind == 0))
- return (get_string_value ("PWD"));
- else
- return (pushd_directory_list[ind]);
-}
-
-#ifdef INCLUDE_UNUSED
-char *
-get_dirstack_element (ind, sign)
- intmax_t ind;
- int sign;
-{
- int i;
-
- i = get_dirstack_index (ind, sign, (int *)NULL);
- return (i < 0 || i > directory_list_offset) ? (char *)NULL
- : pushd_directory_list[i];
-}
-#endif
-
-void
-set_dirstack_element (ind, sign, value)
- intmax_t ind;
- int sign;
- char *value;
-{
- int i;
-
- i = get_dirstack_index (ind, sign, (int *)NULL);
- if (ind == 0 || i < 0 || i > directory_list_offset)
- return;
- free (pushd_directory_list[i]);
- pushd_directory_list[i] = savestring (value);
-}
-
-WORD_LIST *
-get_directory_stack (flags)
- int flags;
-{
- register int i;
- WORD_LIST *ret;
- char *d, *t;
-
- for (ret = (WORD_LIST *)NULL, i = 0; i < directory_list_offset; i++)
- {
- d = (flags&1) ? polite_directory_format (pushd_directory_list[i])
- : pushd_directory_list[i];
- ret = make_word_list (make_word (d), ret);
- }
- /* Now the current directory. */
- d = get_working_directory ("dirstack");
- i = 0; /* sentinel to decide whether or not to free d */
- if (d == 0)
- d = ".";
- else
- {
- t = polite_directory_format (d);
- /* polite_directory_format sometimes returns its argument unchanged.
- If it does not, we can free d right away. If it does, we need to
- mark d to be deleted later. */
- if (t != d)
- {
- free (d);
- d = t;
- }
- else /* t == d, so d is what we want */
- i = 1;
- }
- ret = make_word_list (make_word (d), ret);
- if (i)
- free (d);
- return ret; /* was (REVERSE_LIST (ret, (WORD_LIST *)); */
-}
-
-#ifdef LOADABLE_BUILTIN
-char * const dirs_doc[] = {
-N_("Display the list of currently remembered directories. Directories\n\
- find their way onto the list with the `pushd' command; you can get\n\
- back up through the list with the `popd' command.\n\
- \n\
- Options:\n\
- -c clear the directory stack by deleting all of the elements\n\
- -l do not print tilde-prefixed versions of directories relative\n\
- to your home directory\n\
- -p print the directory stack with one entry per line\n\
- -v print the directory stack with one entry per line prefixed\n\
- with its position in the stack\n\
- \n\
- Arguments:\n\
- +N Displays the Nth entry counting from the left of the list shown by\n\
- dirs when invoked without options, starting with zero.\n\
- \n\
- -N Displays the Nth entry counting from the right of the list shown by\n\
- dirs when invoked without options, starting with zero."),
- (char *)NULL
-};
-
-char * const pushd_doc[] = {
-N_("Adds a directory to the top of the directory stack, or rotates\n\
- the stack, making the new top of the stack the current working\n\
- directory. With no arguments, exchanges the top two directories.\n\
- \n\
- Options:\n\
- -n Suppresses the normal change of directory when adding\n\
- directories to the stack, so only the stack is manipulated.\n\
- \n\
- Arguments:\n\
- +N Rotates the stack so that the Nth directory (counting\n\
- from the left of the list shown by `dirs', starting with\n\
- zero) is at the top.\n\
- \n\
- -N Rotates the stack so that the Nth directory (counting\n\
- from the right of the list shown by `dirs', starting with\n\
- zero) is at the top.\n\
- \n\
- dir Adds DIR to the directory stack at the top, making it the\n\
- new current working directory.\n\
- \n\
- The `dirs' builtin displays the directory stack."),
- (char *)NULL
-};
-
-char * const popd_doc[] = {
-N_("Removes entries from the directory stack. With no arguments, removes\n\
- the top directory from the stack, and changes to the new top directory.\n\
- \n\
- Options:\n\
- -n Suppresses the normal change of directory when removing\n\
- directories from the stack, so only the stack is manipulated.\n\
- \n\
- Arguments:\n\
- +N Removes the Nth entry counting from the left of the list\n\
- shown by `dirs', starting with zero. For example: `popd +0'\n\
- removes the first directory, `popd +1' the second.\n\
- \n\
- -N Removes the Nth entry counting from the right of the list\n\
- shown by `dirs', starting with zero. For example: `popd -0'\n\
- removes the last directory, `popd -1' the next to last.\n\
- \n\
- The `dirs' builtin displays the directory stack."),
- (char *)NULL
-};
-
-struct builtin pushd_struct = {
- "pushd",
- pushd_builtin,
- BUILTIN_ENABLED,
- pushd_doc,
- "pushd [+N | -N] [-n] [dir]",
- 0
-};
-
-struct builtin popd_struct = {
- "popd",
- popd_builtin,
- BUILTIN_ENABLED,
- popd_doc,
- "popd [+N | -N] [-n]",
- 0
-};
-
-struct builtin dirs_struct = {
- "dirs",
- dirs_builtin,
- BUILTIN_ENABLED,
- dirs_doc,
- "dirs [-clpv] [+N] [-N]",
- 0
-};
-#endif /* LOADABLE_BUILTIN */
-
-#endif /* PUSHD_AND_POPD */
+++ /dev/null
-This file is return.def, from which is created return.c.
-It implements the builtin "return" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES return.c
-
-$BUILTIN return
-
-$FUNCTION return_builtin
-$SHORT_DOC return [n]
-Return from a shell function.
-
-Causes a function or sourced script to exit with the return value
-specified by N. If N is omitted, the return status is that of the
-last command executed within the function or script.
-
-Exit Status:
-Returns N, or failure if the shell is not executing a function or script.
-$END
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "common.h"
-#include "bashgetopt.h"
-
-extern int last_command_exit_value;
-extern int subshell_environment;
-extern int return_catch_flag, return_catch_value;
-
-/* If we are executing a user-defined function then exit with the value
- specified as an argument. if no argument is given, then the last
- exit status is used. */
-int
-return_builtin (list)
- WORD_LIST *list;
-{
- return_catch_value = get_exitstat (list);
-
- if (return_catch_flag)
- longjmp (return_catch, 1);
- else
- {
- builtin_error (_("can only `return' from a function or sourced script"));
- return (EXECUTION_FAILURE);
- }
-}
+++ /dev/null
-This file is shift.def, from which is created shift.c.
-It implements the builtin "shift" in Bash.
-
-Copyright (C) 1987-2009 Free Software Foundation, Inc.
-
-This file is part of GNU Bash, the Bourne Again SHell.
-
-Bash is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-Bash is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with Bash. If not, see <http://www.gnu.org/licenses/>.
-
-$PRODUCES shift.c
-
-#include <config.h>
-
-#if defined (HAVE_UNISTD_H)
-# ifdef _MINIX
-# include <sys/types.h>
-# endif
-# include <unistd.h>
-#endif
-
-#include "../bashansi.h"
-#include "../bashintl.h"
-
-#include "../shell.h"
-#include "common.h"
-
-$BUILTIN shift
-$FUNCTION shift_builtin
-$SHORT_DOC shift [n]
-Shift positional parameters.
-
-Rename the positional parameters $N+1,$N+2 ... to $1,$2 ... If N is
-not given, it is assumed to be 1.
-
-Exit Status:
-Returns success unless N is negative or greater than $#.
-$END
-
-int print_shift_error;
-
-/* Shift the arguments ``left''. Shift DOLLAR_VARS down then take one
- off of REST_OF_ARGS and place it into DOLLAR_VARS[9]. If LIST has
- anything in it, it is a number which says where to start the
- shifting. Return > 0 if `times' > $#, otherwise 0. */
-int
-shift_builtin (list)
- WORD_LIST *list;
-{
- intmax_t times;
- register int count;
- WORD_LIST *temp;
-
- if (get_numeric_arg (list, 0, ×) == 0)
- return (EXECUTION_FAILURE);
-
- if (times == 0)
- return (EXECUTION_SUCCESS);
- else if (times < 0)
- {
- sh_erange (list ? list->word->word : NULL, _("shift count"));
- return (EXECUTION_FAILURE);
- }
- else if (times > number_of_args ())
- {
- if (print_shift_error)
- sh_erange (list ? list->word->word : NULL, _("shift count"));
- return (EXECUTION_FAILURE);
- }
-
- while (times-- > 0)
- {
- if (dollar_vars[1])
- free (dollar_vars[1]);
-
- for (count = 1; count < 9; count++)
- dollar_vars[count] = dollar_vars[count + 1];
-
- if (rest_of_args)
- {
- temp = rest_of_args;
- dollar_vars[9] = savestring (temp->word->word);
- rest_of_args = rest_of_args->next;
- temp->next = (WORD_LIST *)NULL;
- dispose_words (temp);
- }
- else
- dollar_vars[9] = (char *)NULL;
- }
- return (EXECUTION_SUCCESS);
-}
+++ /dev/null
-.\"
-.\" MAN PAGE COMMENTS to
-.\"
-.\" Chet Ramey
-.\" Case Western Reserve University
-.\" chet.ramey@case.edu
-.\"
-.\" Last Change: Wed Aug 27 08:43:44 EDT 2014
-.\"
-.\" bash_builtins, strip all but Built-Ins section
-.if \n(zZ=1 .ig zZ
-.if \n(zY=1 .ig zY
-.TH BASH 1 "2014 August 27" "GNU Bash 4.3"
-.\"
-.\" There's some problem with having a `@'
-.\" in a tagged paragraph with the BSD man macros.
-.\" It has to do with `@' appearing in the }1 macro.
-.\" This is a problem on 4.3 BSD and Ultrix, but Sun
-.\" appears to have fixed it.
-.\" If you're seeing the characters
-.\" `@u-3p' appearing before the lines reading
-.\" `possible-hostname-completions
-.\" and `complete-hostname' down in READLINE,
-.\" then uncomment this redefinition.
-.\"
-.de }1
-.ds ]X \&\\*(]B\\
-.nr )E 0
-.if !"\\$1"" .nr )I \\$1n
-.}f
-.ll \\n(LLu
-.in \\n()Ru+\\n(INu+\\n()Iu
-.ti \\n(INu
-.ie !\\n()Iu+\\n()Ru-\w\a\\*(]X\au-3p \{\\*(]X
-.br\}
-.el \\*(]X\h\a|\\n()Iu+\\n()Ru\a\c
-.}f
-..
-.\"
-.\" File Name macro. This used to be `.PN', for Path Name,
-.\" but Sun doesn't seem to like that very much.
-.\"
-.de FN
-\fI\|\\$1\|\fP
-..
-.SH NAME
-bash \- GNU Bourne-Again SHell
-.SH SYNOPSIS
-.B bash
-[options]
-[command_string | file]
-.SH COPYRIGHT
-.if n Bash is Copyright (C) 1989-2013 by the Free Software Foundation, Inc.
-.if t Bash is Copyright \(co 1989-2013 by the Free Software Foundation, Inc.
-.SH DESCRIPTION
-.B Bash
-is an \fBsh\fR-compatible command language interpreter that
-executes commands read from the standard input or from a file.
-.B Bash
-also incorporates useful features from the \fIKorn\fP and \fIC\fP
-shells (\fBksh\fP and \fBcsh\fP).
-.PP
-.B Bash
-is intended to be a conformant implementation of the
-Shell and Utilities portion of the IEEE POSIX specification
-(IEEE Standard 1003.1).
-.B Bash
-can be configured to be POSIX-conformant by default.
-.SH OPTIONS
-All of the single-character shell options documented in the
-description of the \fBset\fR builtin command can be used as options
-when the shell is invoked.
-In addition, \fBbash\fR
-interprets the following options when it is invoked:
-.PP
-.PD 0
-.TP 10
-.B \-c
-If the
-.B \-c
-option is present, then commands are read from the first non-option argument
-.IR command_string .
-If there are arguments after the
-.IR command_string ,
-the first argument is assigned to
-.B $0
-and any remaining arguments are assigned to the positional parameters.
-The assignment to
-.B $0
-sets the name of the shell, which is used in warning and error messages.
-.TP
-.B \-i
-If the
-.B \-i
-option is present, the shell is
-.IR interactive .
-.TP
-.B \-l
-Make
-.B bash
-act as if it had been invoked as a login shell (see
-.SM
-.B INVOCATION
-below).
-.TP
-.B \-r
-If the
-.B \-r
-option is present, the shell becomes
-.I restricted
-(see
-.SM
-.B "RESTRICTED SHELL"
-below).
-.TP
-.B \-s
-If the
-.B \-s
-option is present, or if no arguments remain after option
-processing, then commands are read from the standard input.
-This option allows the positional parameters to be set
-when invoking an interactive shell.
-.TP
-.B \-D
-A list of all double-quoted strings preceded by \fB$\fP
-is printed on the standard output.
-These are the strings that
-are subject to language translation when the current locale
-is not \fBC\fP or \fBPOSIX\fP.
-This implies the \fB\-n\fP option; no commands will be executed.
-.TP
-.B [\-+]O [\fIshopt_option\fP]
-\fIshopt_option\fP is one of the shell options accepted by the
-\fBshopt\fP builtin (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-If \fIshopt_option\fP is present, \fB\-O\fP sets the value of that option;
-\fB+O\fP unsets it.
-If \fIshopt_option\fP is not supplied, the names and values of the shell
-options accepted by \fBshopt\fP are printed on the standard output.
-If the invocation option is \fB+O\fP, the output is displayed in a format
-that may be reused as input.
-.TP
-.B \-\-
-A
-.B \-\-
-signals the end of options and disables further option processing.
-Any arguments after the
-.B \-\-
-are treated as filenames and arguments. An argument of
-.B \-
-is equivalent to \fB\-\-\fP.
-.PD
-.PP
-.B Bash
-also interprets a number of multi-character options.
-These options must appear on the command line before the
-single-character options to be recognized.
-.PP
-.PD 0
-.TP
-.B \-\-debugger
-Arrange for the debugger profile to be executed before the shell
-starts.
-Turns on extended debugging mode (see the description of the
-.B extdebug
-option to the
-.B shopt
-builtin below).
-.TP
-.B \-\-dump\-po\-strings
-Equivalent to \fB\-D\fP, but the output is in the GNU \fIgettext\fP
-\fBpo\fP (portable object) file format.
-.TP
-.B \-\-dump\-strings
-Equivalent to \fB\-D\fP.
-.TP
-.B \-\-help
-Display a usage message on standard output and exit successfully.
-.TP
-\fB\-\-init\-file\fP \fIfile\fP
-.PD 0
-.TP
-\fB\-\-rcfile\fP \fIfile\fP
-.PD
-Execute commands from
-.I file
-instead of the standard personal initialization file
-.I ~/.bashrc
-if the shell is interactive (see
-.SM
-.B INVOCATION
-below).
-.TP
-.B \-\-login
-Equivalent to \fB\-l\fP.
-.TP
-.B \-\-noediting
-Do not use the GNU
-.B readline
-library to read command lines when the shell is interactive.
-.TP
-.B \-\-noprofile
-Do not read either the system-wide startup file
-.FN /etc/profile
-or any of the personal initialization files
-.IR ~/.bash_profile ,
-.IR ~/.bash_login ,
-or
-.IR ~/.profile .
-By default,
-.B bash
-reads these files when it is invoked as a login shell (see
-.SM
-.B INVOCATION
-below).
-.TP
-.B \-\-norc
-Do not read and execute the personal initialization file
-.I ~/.bashrc
-if the shell is interactive.
-This option is on by default if the shell is invoked as
-.BR sh .
-.TP
-.B \-\-posix
-Change the behavior of \fBbash\fP where the default operation differs
-from the POSIX standard to match the standard (\fIposix mode\fP).
-See
-.SM
-.B "SEE ALSO"
-below for a reference to a document that details how posix mode affects
-bash's behavior.
-.TP
-.B \-\-restricted
-The shell becomes restricted (see
-.SM
-.B "RESTRICTED SHELL"
-below).
-.TP
-.B \-\-verbose
-Equivalent to \fB\-v\fP.
-.TP
-.B \-\-version
-Show version information for this instance of
-.B bash
-on the standard output and exit successfully.
-.PD
-.SH ARGUMENTS
-If arguments remain after option processing, and neither the
-.B \-c
-nor the
-.B \-s
-option has been supplied, the first argument is assumed to
-be the name of a file containing shell commands.
-If
-.B bash
-is invoked in this fashion,
-.B $0
-is set to the name of the file, and the positional parameters
-are set to the remaining arguments.
-.B Bash
-reads and executes commands from this file, then exits.
-\fBBash\fP's exit status is the exit status of the last command
-executed in the script.
-If no commands are executed, the exit status is 0.
-An attempt is first made to open the file in the current directory, and,
-if no file is found, then the shell searches the directories in
-.SM
-.B PATH
-for the script.
-.SH INVOCATION
-A \fIlogin shell\fP is one whose first character of argument zero is a
-.BR \- ,
-or one started with the
-.B \-\-login
-option.
-.PP
-An \fIinteractive\fP shell is one started without non-option arguments
-and without the
-.B \-c
-option
-whose standard input and error are
-both connected to terminals (as determined by
-.IR isatty (3)),
-or one started with the
-.B \-i
-option.
-.SM
-.B PS1
-is set and
-.B $\-
-includes
-.B i
-if
-.B bash
-is interactive,
-allowing a shell script or a startup file to test this state.
-.PP
-The following paragraphs describe how
-.B bash
-executes its startup files.
-If any of the files exist but cannot be read,
-.B bash
-reports an error.
-Tildes are expanded in filenames as described below under
-.B "Tilde Expansion"
-in the
-.SM
-.B EXPANSION
-section.
-.PP
-When
-.B bash
-is invoked as an interactive login shell, or as a non-interactive shell
-with the \fB\-\-login\fP option, it first reads and
-executes commands from the file \fI/etc/profile\fP, if that
-file exists.
-After reading that file, it looks for \fI~/.bash_profile\fP,
-\fI~/.bash_login\fP, and \fI~/.profile\fP, in that order, and reads
-and executes commands from the first one that exists and is readable.
-The
-.B \-\-noprofile
-option may be used when the shell is started to inhibit this behavior.
-.PP
-When a login shell exits,
-.B bash
-reads and executes commands from the file \fI~/.bash_logout\fP, if it
-exists.
-.PP
-When an interactive shell that is not a login shell is started,
-.B bash
-reads and executes commands from \fI~/.bashrc\fP, if that file exists.
-This may be inhibited by using the
-.B \-\-norc
-option.
-The \fB\-\-rcfile\fP \fIfile\fP option will force
-.B bash
-to read and execute commands from \fIfile\fP instead of \fI~/.bashrc\fP.
-.PP
-When
-.B bash
-is started non-interactively, to run a shell script, for example, it
-looks for the variable
-.SM
-.B BASH_ENV
-in the environment, expands its value if it appears there, and uses the
-expanded value as the name of a file to read and execute.
-.B Bash
-behaves as if the following command were executed:
-.sp .5
-.RS
-.if t \f(CWif [ \-n "$BASH_ENV" ]; then . "$BASH_ENV"; fi\fP
-.if n if [ \-n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
-.RE
-.sp .5
-but the value of the
-.SM
-.B PATH
-variable is not used to search for the filename.
-.PP
-If
-.B bash
-is invoked with the name
-.BR sh ,
-it tries to mimic the startup behavior of historical versions of
-.B sh
-as closely as possible,
-while conforming to the POSIX standard as well.
-When invoked as an interactive login shell, or a non-interactive
-shell with the \fB\-\-login\fP option, it first attempts to
-read and execute commands from
-.I /etc/profile
-and
-.IR ~/.profile ,
-in that order.
-The
-.B \-\-noprofile
-option may be used to inhibit this behavior.
-When invoked as an interactive shell with the name
-.BR sh ,
-.B bash
-looks for the variable
-.SM
-.BR ENV ,
-expands its value if it is defined, and uses the
-expanded value as the name of a file to read and execute.
-Since a shell invoked as
-.B sh
-does not attempt to read and execute commands from any other startup
-files, the
-.B \-\-rcfile
-option has no effect.
-A non-interactive shell invoked with the name
-.B sh
-does not attempt to read any other startup files.
-When invoked as
-.BR sh ,
-.B bash
-enters
-.I posix
-mode after the startup files are read.
-.PP
-When
-.B bash
-is started in
-.I posix
-mode, as with the
-.B \-\-posix
-command line option, it follows the POSIX standard for startup files.
-In this mode, interactive shells expand the
-.SM
-.B ENV
-variable and commands are read and executed from the file
-whose name is the expanded value.
-No other startup files are read.
-.PP
-.B Bash
-attempts to determine when it is being run with its standard input
-connected to a network connection, as when executed by the remote shell
-daemon, usually \fIrshd\fP, or the secure shell daemon \fIsshd\fP.
-If
-.B bash
-determines it is being run in this fashion, it reads and executes
-commands from \fI~/.bashrc\fP, if that file exists and is readable.
-It will not do this if invoked as \fBsh\fP.
-The
-.B \-\-norc
-option may be used to inhibit this behavior, and the
-.B \-\-rcfile
-option may be used to force another file to be read, but neither
-\fIrshd\fP nor \fIsshd\fP generally invoke the shell with those options
-or allow them to be specified.
-.PP
-If the shell is started with the effective user (group) id not equal to the
-real user (group) id, and the \fB\-p\fP option is not supplied, no startup
-files are read, shell functions are not inherited from the environment, the
-.SM
-.BR SHELLOPTS ,
-.SM
-.BR BASHOPTS ,
-.SM
-.BR CDPATH ,
-and
-.SM
-.B GLOBIGNORE
-variables, if they appear in the environment, are ignored,
-and the effective user id is set to the real user id.
-If the \fB\-p\fP option is supplied at invocation, the startup behavior is
-the same, but the effective user id is not reset.
-.SH DEFINITIONS
-.PP
-The following definitions are used throughout the rest of this
-document.
-.PD 0
-.TP
-.B blank
-A space or tab.
-.TP
-.B word
-A sequence of characters considered as a single unit by the shell.
-Also known as a
-.BR token .
-.TP
-.B name
-A
-.I word
-consisting only of alphanumeric characters and underscores, and
-beginning with an alphabetic character or an underscore. Also
-referred to as an
-.BR identifier .
-.TP
-.B metacharacter
-A character that, when unquoted, separates words. One of the following:
-.br
-.RS
-.PP
-.if t \fB| & ; ( ) < > space tab\fP
-.if n \fB| & ; ( ) < > space tab\fP
-.RE
-.PP
-.TP
-.B control operator
-A \fItoken\fP that performs a control function. It is one of the following
-symbols:
-.RS
-.PP
-.if t \fB|| & && ; ;; ( ) | |& <newline>\fP
-.if n \fB|| & && ; ;; ( ) | |& <newline>\fP
-.RE
-.PD
-.SH "RESERVED WORDS"
-\fIReserved words\fP are words that have a special meaning to the shell.
-The following words are recognized as reserved when unquoted and either
-the first word of a simple command (see
-.SM
-.B SHELL GRAMMAR
-below) or the third word of a
-.B case
-or
-.B for
-command:
-.if t .RS
-.PP
-.B
-.if n ! case coproc do done elif else esac fi for function if in select then until while { } time [[ ]]
-.if t ! case coproc do done elif else esac fi for function if in select then until while { } time [[ ]]
-.if t .RE
-.SH "SHELL GRAMMAR"
-.SS Simple Commands
-.PP
-A \fIsimple command\fP is a sequence of optional variable assignments
-followed by \fBblank\fP-separated words and redirections, and
-terminated by a \fIcontrol operator\fP. The first word
-specifies the command to be executed, and is passed as argument zero.
-The remaining words are passed as arguments to the invoked command.
-.PP
-The return value of a \fIsimple command\fP is its exit status, or
-128+\fIn\^\fP if the command is terminated by signal
-.IR n .
-.SS Pipelines
-.PP
-A \fIpipeline\fP is a sequence of one or more commands separated by
-one of the control operators
-.B |
-or \fB|&\fP.
-The format for a pipeline is:
-.RS
-.PP
-[\fBtime\fP [\fB\-p\fP]] [ ! ] \fIcommand\fP [ [\fB|\fP\(bv\fB|&\fP] \fIcommand2\fP ... ]
-.RE
-.PP
-The standard output of
-.I command
-is connected via a pipe to the standard input of
-.IR command2 .
-This connection is performed before any redirections specified by the
-command (see
-.SM
-.B REDIRECTION
-below).
-If \fB|&\fP is used, \fIcommand\fP's standard error, in addition to its
-standard output, is connected to
-\fIcommand2\fP's standard input through the pipe;
-it is shorthand for \fB2>&1 |\fP.
-This implicit redirection of the standard error to the standard output is
-performed after any redirections specified by the command.
-.PP
-The return status of a pipeline is the exit status of the last
-command, unless the \fBpipefail\fP option is enabled.
-If \fBpipefail\fP is enabled, the pipeline's return status is the
-value of the last (rightmost) command to exit with a non-zero status,
-or zero if all commands exit successfully.
-If the reserved word
-.B !
-precedes a pipeline, the exit status of that pipeline is the logical
-negation of the exit status as described above.
-The shell waits for all commands in the pipeline to
-terminate before returning a value.
-.PP
-If the
-.B time
-reserved word precedes a pipeline, the elapsed as well as user and
-system time consumed by its execution are reported when the pipeline
-terminates.
-The \fB\-p\fP option changes the output format to that specified by POSIX.
-When the shell is in \fIposix mode\fP, it does not recognize
-\fBtime\fP as a reserved word if the next token begins with a `-'.
-The
-.SM
-.B TIMEFORMAT
-variable may be set to a format string that specifies how the timing
-information should be displayed; see the description of
-.SM
-.B TIMEFORMAT
-under
-.B "Shell Variables"
-below.
-.PP
-When the shell is in \fIposix mode\fP, \fBtime\fP
-may be followed by a newline. In this case, the shell displays the
-total user and system time consumed by the shell and its children.
-The
-.SM
-.B TIMEFORMAT
-variable may be used to specify the format of
-the time information.
-.PP
-Each command in a pipeline is executed as a separate process (i.e., in a
-subshell).
-.SS Lists
-.PP
-A \fIlist\fP is a sequence of one or more pipelines separated by one
-of the operators
-.BR ; ,
-.BR & ,
-.BR && ,
-or
-.BR || ,
-and optionally terminated by one of
-.BR ; ,
-.BR & ,
-or
-.BR <newline> .
-.PP
-Of these list operators,
-.B &&
-and
-.B ||
-have equal precedence, followed by
-.B ;
-and
-.BR & ,
-which have equal precedence.
-.PP
-A sequence of one or more newlines may appear in a \fIlist\fP instead
-of a semicolon to delimit commands.
-.PP
-If a command is terminated by the control operator
-.BR & ,
-the shell executes the command in the \fIbackground\fP
-in a subshell. The shell does not wait for the command to
-finish, and the return status is 0. Commands separated by a
-.B ;
-are executed sequentially; the shell waits for each
-command to terminate in turn. The return status is the
-exit status of the last command executed.
-.PP
-AND and OR lists are sequences of one of more pipelines separated by the
-\fB&&\fP and \fB||\fP control operators, respectively.
-AND and OR lists are executed with left associativity.
-An AND list has the form
-.RS
-.PP
-\fIcommand1\fP \fB&&\fP \fIcommand2\fP
-.RE
-.PP
-.I command2
-is executed if, and only if,
-.I command1
-returns an exit status of zero.
-.PP
-An OR list has the form
-.RS
-.PP
-\fIcommand1\fP \fB||\fP \fIcommand2\fP
-.PP
-.RE
-.PP
-.I command2
-is executed if and only if
-.I command1
-returns a non-zero exit status.
-The return status of
-AND and OR lists is the exit status of the last command
-executed in the list.
-.SS Compound Commands
-.PP
-A \fIcompound command\fP is one of the following.
-In most cases a \fIlist\fP in a command's description may be separated from
-the rest of the command by one or more newlines, and may be followed by a
-newline in place of a semicolon.
-.TP
-(\fIlist\fP)
-\fIlist\fP is executed in a subshell environment (see
-.SM
-\fBCOMMAND EXECUTION ENVIRONMENT\fP
-below).
-Variable assignments and builtin
-commands that affect the shell's environment do not remain in effect
-after the command completes. The return status is the exit status of
-\fIlist\fP.
-.TP
-{ \fIlist\fP; }
-\fIlist\fP is simply executed in the current shell environment.
-\fIlist\fP must be terminated with a newline or semicolon.
-This is known as a \fIgroup command\fP.
-The return status is the exit status of
-\fIlist\fP.
-Note that unlike the metacharacters \fB(\fP and \fB)\fP, \fB{\fP and
-\fB}\fP are \fIreserved words\fP and must occur where a reserved
-word is permitted to be recognized. Since they do not cause a word
-break, they must be separated from \fIlist\fP by whitespace or another
-shell metacharacter.
-.TP
-((\fIexpression\fP))
-The \fIexpression\fP is evaluated according to the rules described
-below under
-.SM
-.BR "ARITHMETIC EVALUATION" .
-If the value of the expression is non-zero, the return status is 0;
-otherwise the return status is 1. This is exactly equivalent to
-\fBlet "\fIexpression\fP"\fR.
-.TP
-\fB[[\fP \fIexpression\fP \fB]]\fP
-Return a status of 0 or 1 depending on the evaluation of
-the conditional expression \fIexpression\fP.
-Expressions are composed of the primaries described below under
-.SM
-.BR "CONDITIONAL EXPRESSIONS" .
-Word splitting and pathname expansion are not performed on the words
-between the \fB[[\fP and \fB]]\fP; tilde expansion,
-parameter and variable expansion,
-arithmetic expansion, command substitution, process
-substitution, and quote removal are performed.
-Conditional operators such as \fB\-f\fP must be unquoted to be recognized
-as primaries.
-.if t .sp 0.5
-.if n .sp 1
-When used with \fB[[\fP, the \fB<\fP and \fB>\fP operators sort
-lexicographically using the current locale.
-.if t .sp 0.5
-.if n .sp 1
-When the \fB==\fP and \fB!=\fP operators are used, the string to the
-right of the operator is considered a pattern and matched according
-to the rules described below under \fBPattern Matching\fP,
-as if the \fBextglob\fP shell option were enabled.
-The \fB=\fP operator is equivalent to \fB==\fP.
-If the shell option
-.B nocasematch
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-The return value is 0 if the string matches (\fB==\fP) or does not match
-(\fB!=\fP) the pattern, and 1 otherwise.
-Any part of the pattern may be quoted to force the quoted portion
-to be matched as a string.
-.if t .sp 0.5
-.if n .sp 1
-An additional binary operator, \fB=~\fP, is available, with the same
-precedence as \fB==\fP and \fB!=\fP.
-When it is used, the string to the right of the operator is considered
-an extended regular expression and matched accordingly (as in \fIregex\fP(3)).
-The return value is 0 if the string matches
-the pattern, and 1 otherwise.
-If the regular expression is syntactically incorrect, the conditional
-expression's return value is 2.
-If the shell option
-.B nocasematch
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-Any part of the pattern may be quoted to force the quoted portion
-to be matched as a string.
-Bracket expressions in regular expressions must be treated carefully,
-since normal quoting characters lose their meanings between brackets.
-If the pattern is stored in a shell variable, quoting the variable
-expansion forces the entire pattern to be matched as a string.
-Substrings matched by parenthesized subexpressions within the regular
-expression are saved in the array variable
-.SM
-.BR BASH_REMATCH .
-The element of
-.SM
-.B BASH_REMATCH
-with index 0 is the portion of the string
-matching the entire regular expression.
-The element of
-.SM
-.B BASH_REMATCH
-with index \fIn\fP is the portion of the
-string matching the \fIn\fPth parenthesized subexpression.
-.if t .sp 0.5
-.if n .sp 1
-Expressions may be combined using the following operators, listed
-in decreasing order of precedence:
-.if t .sp 0.5
-.if n .sp 1
-.RS
-.PD 0
-.TP
-.B ( \fIexpression\fP )
-Returns the value of \fIexpression\fP.
-This may be used to override the normal precedence of operators.
-.TP
-.B ! \fIexpression\fP
-True if
-.I expression
-is false.
-.TP
-\fIexpression1\fP \fB&&\fP \fIexpression2\fP
-True if both
-.I expression1
-and
-.I expression2
-are true.
-.TP
-\fIexpression1\fP \fB||\fP \fIexpression2\fP
-True if either
-.I expression1
-or
-.I expression2
-is true.
-.PD
-.LP
-The \fB&&\fP and \fB||\fP
-operators do not evaluate \fIexpression2\fP if the value of
-\fIexpression1\fP is sufficient to determine the return value of
-the entire conditional expression.
-.RE
-.TP
-\fBfor\fP \fIname\fP [ [ \fBin\fP [ \fIword ...\fP ] ] ; ] \fBdo\fP \fIlist\fP ; \fBdone\fP
-The list of words following \fBin\fP is expanded, generating a list
-of items.
-The variable \fIname\fP is set to each element of this list
-in turn, and \fIlist\fP is executed each time.
-If the \fBin\fP \fIword\fP is omitted, the \fBfor\fP command executes
-\fIlist\fP once for each positional parameter that is set (see
-.SM
-.B PARAMETERS
-below).
-The return status is the exit status of the last command that executes.
-If the expansion of the items following \fBin\fP results in an empty
-list, no commands are executed, and the return status is 0.
-.TP
-\fBfor\fP (( \fIexpr1\fP ; \fIexpr2\fP ; \fIexpr3\fP )) ; \fBdo\fP \fIlist\fP ; \fBdone\fP
-First, the arithmetic expression \fIexpr1\fP is evaluated according
-to the rules described below under
-.SM
-.BR "ARITHMETIC EVALUATION" .
-The arithmetic expression \fIexpr2\fP is then evaluated repeatedly
-until it evaluates to zero.
-Each time \fIexpr2\fP evaluates to a non-zero value, \fIlist\fP is
-executed and the arithmetic expression \fIexpr3\fP is evaluated.
-If any expression is omitted, it behaves as if it evaluates to 1.
-The return value is the exit status of the last command in \fIlist\fP
-that is executed, or false if any of the expressions is invalid.
-.TP
-\fBselect\fP \fIname\fP [ \fBin\fP \fIword\fP ] ; \fBdo\fP \fIlist\fP ; \fBdone\fP
-The list of words following \fBin\fP is expanded, generating a list
-of items. The set of expanded words is printed on the standard
-error, each preceded by a number. If the \fBin\fP
-\fIword\fP is omitted, the positional parameters are printed (see
-.SM
-.B PARAMETERS
-below). The
-.SM
-.B PS3
-prompt is then displayed and a line read from the standard input.
-If the line consists of a number corresponding to one of
-the displayed words, then the value of
-.I name
-is set to that word. If the line is empty, the words and prompt
-are displayed again. If EOF is read, the command completes. Any
-other value read causes
-.I name
-to be set to null. The line read is saved in the variable
-.SM
-.BR REPLY .
-The
-.I list
-is executed after each selection until a
-.B break
-command is executed.
-The exit status of
-.B select
-is the exit status of the last command executed in
-.IR list ,
-or zero if no commands were executed.
-.TP
-\fBcase\fP \fIword\fP \fBin\fP [ [(] \fIpattern\fP [ \fB|\fP \fIpattern\fP ] \
-... ) \fIlist\fP ;; ] ... \fBesac\fP
-A \fBcase\fP command first expands \fIword\fP, and tries to match
-it against each \fIpattern\fP in turn, using the same matching rules
-as for pathname expansion (see
-.B Pathname Expansion
-below).
-The \fIword\fP is expanded using tilde
-expansion, parameter and variable expansion, arithmetic substitution,
-command substitution, process substitution and quote removal.
-Each \fIpattern\fP examined is expanded using tilde
-expansion, parameter and variable expansion, arithmetic substitution,
-command substitution, and process substitution.
-If the shell option
-.B nocasematch
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-When a match is found, the corresponding \fIlist\fP is executed.
-If the \fB;;\fP operator is used, no subsequent matches are attempted after
-the first pattern match.
-Using \fB;&\fP in place of \fB;;\fP causes execution to continue with
-the \fIlist\fP associated with the next set of patterns.
-Using \fB;;&\fP in place of \fB;;\fP causes the shell to test the next
-pattern list in the statement, if any, and execute any associated \fIlist\fP
-on a successful match.
-The exit status is zero if no
-pattern matches. Otherwise, it is the exit status of the
-last command executed in \fIlist\fP.
-.TP
-\fBif\fP \fIlist\fP; \fBthen\fP \fIlist\fP; \
-[ \fBelif\fP \fIlist\fP; \fBthen\fP \fIlist\fP; ] ... \
-[ \fBelse\fP \fIlist\fP; ] \fBfi\fP
-The
-.B if
-.I list
-is executed. If its exit status is zero, the
-\fBthen\fP \fIlist\fP is executed. Otherwise, each \fBelif\fP
-\fIlist\fP is executed in turn, and if its exit status is zero,
-the corresponding \fBthen\fP \fIlist\fP is executed and the
-command completes. Otherwise, the \fBelse\fP \fIlist\fP is
-executed, if present. The exit status is the exit status of the
-last command executed, or zero if no condition tested true.
-.TP
-\fBwhile\fP \fIlist-1\fP; \fBdo\fP \fIlist-2\fP; \fBdone\fP
-.PD 0
-.TP
-\fBuntil\fP \fIlist-1\fP; \fBdo\fP \fIlist-2\fP; \fBdone\fP
-.PD
-The \fBwhile\fP command continuously executes the list
-\fIlist-2\fP as long as the last command in the list \fIlist-1\fP returns
-an exit status of zero. The \fBuntil\fP command is identical
-to the \fBwhile\fP command, except that the test is negated;
-.I list-2
-is executed as long as the last command in
-.I list-1
-returns a non-zero exit status.
-The exit status of the \fBwhile\fP and \fBuntil\fP commands
-is the exit status
-of the last command executed in \fIlist-2\fP, or zero if
-none was executed.
-.SS Coprocesses
-.PP
-A \fIcoprocess\fP is a shell command preceded by the \fBcoproc\fP reserved
-word.
-A coprocess is executed asynchronously in a subshell, as if the command
-had been terminated with the \fB&\fP control operator, with a two-way pipe
-established between the executing shell and the coprocess.
-.PP
-The format for a coprocess is:
-.RS
-.PP
-\fBcoproc\fP [\fINAME\fP] \fIcommand\fP [\fIredirections\fP]
-.RE
-.PP
-This creates a coprocess named \fINAME\fP.
-If \fINAME\fP is not supplied, the default name is \fBCOPROC\fP.
-\fINAME\fP must not be supplied if \fIcommand\fP is a \fIsimple
-command\fP (see above); otherwise, it is interpreted as the first word
-of the simple command.
-When the coprocess is executed, the shell creates an array variable (see
-.B Arrays
-below) named \fINAME\fP in the context of the executing shell.
-The standard output of
-.I command
-is connected via a pipe to a file descriptor in the executing shell,
-and that file descriptor is assigned to \fINAME\fP[0].
-The standard input of
-.I command
-is connected via a pipe to a file descriptor in the executing shell,
-and that file descriptor is assigned to \fINAME\fP[1].
-This pipe is established before any redirections specified by the
-command (see
-.SM
-.B REDIRECTION
-below).
-The file descriptors can be utilized as arguments to shell commands
-and redirections using standard word expansions.
-The file descriptors are not available in subshells.
-The process ID of the shell spawned to execute the coprocess is
-available as the value of the variable \fINAME\fP_PID.
-The \fBwait\fP
-builtin command may be used to wait for the coprocess to terminate.
-.PP
-Since the coprocess is created as an asynchronous command,
-the \fBcoproc\fP command always returns success.
-The return status of a coprocess is the exit status of \fIcommand\fP.
-.SS Shell Function Definitions
-.PP
-A shell function is an object that is called like a simple command and
-executes a compound command with a new set of positional parameters.
-Shell functions are declared as follows:
-.TP
-\fIname\fP () \fIcompound\-command\fP [\fIredirection\fP]
-.PD 0
-.TP
-\fBfunction\fP \fIname\fP [()] \fIcompound\-command\fP [\fIredirection\fP]
-.PD
-This defines a function named \fIname\fP.
-The reserved word \fBfunction\fP is optional.
-If the \fBfunction\fP reserved word is supplied, the parentheses are optional.
-The \fIbody\fP of the function is the compound command
-.I compound\-command
-(see \fBCompound Commands\fP above).
-That command is usually a \fIlist\fP of commands between { and }, but
-may be any command listed under \fBCompound Commands\fP above,
-with one exception: If the \fBfunction\fP reserved word is used, but the
-parentheses are not supplied, the braces are required.
-\fIcompound\-command\fP is executed whenever \fIname\fP is specified as the
-name of a simple command.
-When in \fIposix mode\fP, \fIname\fP may not be the name of one of the
-POSIX \fIspecial builtins\fP.
-Any redirections (see
-.SM
-.B REDIRECTION
-below) specified when a function is defined are performed
-when the function is executed.
-The exit status of a function definition is zero unless a syntax error
-occurs or a readonly function with the same name already exists.
-When executed, the exit status of a function is the exit status of the
-last command executed in the body. (See
-.SM
-.B FUNCTIONS
-below.)
-.SH COMMENTS
-In a non-interactive shell, or an interactive shell in which the
-.B interactive_comments
-option to the
-.B shopt
-builtin is enabled (see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below), a word beginning with
-.B #
-causes that word and all remaining characters on that line to
-be ignored. An interactive shell without the
-.B interactive_comments
-option enabled does not allow comments. The
-.B interactive_comments
-option is on by default in interactive shells.
-.SH QUOTING
-\fIQuoting\fP is used to remove the special meaning of certain
-characters or words to the shell. Quoting can be used to
-disable special treatment for special characters, to prevent
-reserved words from being recognized as such, and to prevent
-parameter expansion.
-.PP
-Each of the \fImetacharacters\fP listed above under
-.SM
-.B DEFINITIONS
-has special meaning to the shell and must be quoted if it is to
-represent itself.
-.PP
-When the command history expansion facilities are being used
-(see
-.SM
-.B HISTORY EXPANSION
-below), the
-\fIhistory expansion\fP character, usually \fB!\fP, must be quoted
-to prevent history expansion.
-.PP
-There are three quoting mechanisms: the
-.IR "escape character" ,
-single quotes, and double quotes.
-.PP
-A non-quoted backslash (\fB\e\fP) is the
-.IR "escape character" .
-It preserves the literal value of the next character that follows,
-with the exception of <newline>. If a \fB\e\fP<newline> pair
-appears, and the backslash is not itself quoted, the \fB\e\fP<newline>
-is treated as a line continuation (that is, it is removed from the
-input stream and effectively ignored).
-.PP
-Enclosing characters in single quotes preserves the literal value
-of each character within the quotes. A single quote may not occur
-between single quotes, even when preceded by a backslash.
-.PP
-Enclosing characters in double quotes preserves the literal value
-of all characters within the quotes, with the exception of
-.BR $ ,
-.BR \` ,
-.BR \e ,
-and, when history expansion is enabled,
-.BR ! .
-The characters
-.B $
-and
-.B \`
-retain their special meaning within double quotes. The backslash
-retains its special meaning only when followed by one of the following
-characters:
-.BR $ ,
-.BR \` ,
-\^\fB"\fP\^,
-.BR \e ,
-or
-.BR <newline> .
-A double quote may be quoted within double quotes by preceding it with
-a backslash.
-If enabled, history expansion will be performed unless an
-.B !
-appearing in double quotes is escaped using a backslash.
-The backslash preceding the
-.B !
-is not removed.
-.PP
-The special parameters
-.B *
-and
-.B @
-have special meaning when in double
-quotes (see
-.SM
-.B PARAMETERS
-below).
-.PP
-Words of the form \fB$\fP\(aq\fIstring\fP\(aq are treated specially. The
-word expands to \fIstring\fP, with backslash-escaped characters replaced
-as specified by the ANSI C standard. Backslash escape sequences, if
-present, are decoded as follows:
-.RS
-.PD 0
-.TP
-.B \ea
-alert (bell)
-.TP
-.B \eb
-backspace
-.TP
-.B \ee
-.TP
-.B \eE
-an escape character
-.TP
-.B \ef
-form feed
-.TP
-.B \en
-new line
-.TP
-.B \er
-carriage return
-.TP
-.B \et
-horizontal tab
-.TP
-.B \ev
-vertical tab
-.TP
-.B \e\e
-backslash
-.TP
-.B \e\(aq
-single quote
-.TP
-.B \e\(dq
-double quote
-.TP
-.B \e\fInnn\fP
-the eight-bit character whose value is the octal value \fInnn\fP
-(one to three digits)
-.TP
-.B \ex\fIHH\fP
-the eight-bit character whose value is the hexadecimal value \fIHH\fP
-(one or two hex digits)
-.TP
-.B \eu\fIHHHH\fP
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-\fIHHHH\fP (one to four hex digits)
-.TP
-.B \eU\fIHHHHHHHH\fP
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-\fIHHHHHHHH\fP (one to eight hex digits)
-.TP
-.B \ec\fIx\fP
-a control-\fIx\fP character
-.PD
-.RE
-.LP
-The expanded result is single-quoted, as if the dollar sign had
-not been present.
-.PP
-A double-quoted string preceded by a dollar sign (\fB$\fP\(dq\fIstring\fP\(dq)
-will cause the string to be translated according to the current locale.
-If the current locale is \fBC\fP or \fBPOSIX\fP, the dollar sign
-is ignored.
-If the string is translated and replaced, the replacement is
-double-quoted.
-.SH PARAMETERS
-A
-.I parameter
-is an entity that stores values.
-It can be a
-.IR name ,
-a number, or one of the special characters listed below under
-.BR "Special Parameters" .
-A
-.I variable
-is a parameter denoted by a
-.IR name .
-A variable has a \fIvalue\fP and zero or more \fIattributes\fP.
-Attributes are assigned using the
-.B declare
-builtin command (see
-.B declare
-below in
-.SM
-.BR "SHELL BUILTIN COMMANDS" ).
-.PP
-A parameter is set if it has been assigned a value. The null string is
-a valid value. Once a variable is set, it may be unset only by using
-the
-.B unset
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.PP
-A
-.I variable
-may be assigned to by a statement of the form
-.RS
-.PP
-\fIname\fP=[\fIvalue\fP]
-.RE
-.PP
-If
-.I value
-is not given, the variable is assigned the null string. All
-.I values
-undergo tilde expansion, parameter and variable expansion,
-command substitution, arithmetic expansion, and quote
-removal (see
-.SM
-.B EXPANSION
-below). If the variable has its
-.B integer
-attribute set, then
-.I value
-is evaluated as an arithmetic expression even if the $((...)) expansion is
-not used (see
-.B "Arithmetic Expansion"
-below).
-Word splitting is not performed, with the exception
-of \fB"$@"\fP as explained below under
-.BR "Special Parameters" .
-Pathname expansion is not performed.
-Assignment statements may also appear as arguments to the
-.BR alias ,
-.BR declare ,
-.BR typeset ,
-.BR export ,
-.BR readonly ,
-and
-.B local
-builtin commands (\fIdeclaration\fP commands).
-When in \fIposix mode\fP, these builtins may appear in a command after
-one or more instances of the \fBcommand\fP builtin and retain these
-assignment statement properties.
-.PP
-In the context where an assignment statement is assigning a value
-to a shell variable or array index, the += operator can be used to
-append to or add to the variable's previous value.
-This includes arguments to builtin commands such as \fBdeclare\fP that
-accept assignment statements (\fIdeclaration\fP commands).
-When += is applied to a variable for which the \fIinteger\fP attribute has been
-set, \fIvalue\fP is evaluated as an arithmetic expression and added to the
-variable's current value, which is also evaluated.
-When += is applied to an array variable using compound assignment (see
-.B Arrays
-below), the
-variable's value is not unset (as it is when using =), and new values are
-appended to the array beginning at one greater than the array's maximum index
-(for indexed arrays) or added as additional key\-value pairs in an
-associative array.
-When applied to a string-valued variable, \fIvalue\fP is expanded and
-appended to the variable's value.
-.PP
-A variable can be assigned the \fInameref\fP attribute using the
-\fB\-n\fP option to the \fBdeclare\fP or \fBlocal\fP builtin commands
-(see the descriptions of \fBdeclare\fP and \fBlocal\fP below)
-to create a \fInameref\fP, or a reference to another variable.
-This allows variables to be manipulated indirectly.
-Whenever the nameref variable is referenced, assigned to, unset, or has
-its attributes modified (other than the \fInameref\fP attribute itself), the
-operation is actually performed on the variable specified by the nameref
-variable's value.
-A nameref is commonly used within shell functions to refer to a variable
-whose name is passed as an argument to the function.
-For instance, if a variable name is passed to a shell function as its first
-argument, running
-.sp .5
-.RS
-.if t \f(CWdeclare -n ref=$1\fP
-.if n declare -n ref=$1
-.RE
-.sp .5
-inside the function creates a nameref variable \fBref\fP whose value is
-the variable name passed as the first argument.
-References and assignments to \fBref\fP, and changes to its attributes,
-are treated as references, assignments, and attribute modifications
-to the variable whose name was passed as \fB$1\fP.
-If the control variable in a \fBfor\fP loop has the nameref attribute,
-the list of words can be a list of shell variables, and a name reference
-will be established for each word in the list, in turn, when the loop is
-executed.
-Array variables cannot be given the \fB\nameref\fP attribute.
-However, nameref variables can reference array variables and subscripted
-array variables.
-Namerefs can be unset using the \fB\-n\fP option to the \fBunset\fP builtin.
-Otherwise, if \fBunset\fP is executed with the name of a nameref variable
-as an argument, the variable referenced by the nameref variable will be unset.
-.SS Positional Parameters
-.PP
-A
-.I positional parameter
-is a parameter denoted by one or more
-digits, other than the single digit 0. Positional parameters are
-assigned from the shell's arguments when it is invoked,
-and may be reassigned using the
-.B set
-builtin command. Positional parameters may not be assigned to
-with assignment statements. The positional parameters are
-temporarily replaced when a shell function is executed (see
-.SM
-.B FUNCTIONS
-below).
-.PP
-When a positional parameter consisting of more than a single
-digit is expanded, it must be enclosed in braces (see
-.SM
-.B EXPANSION
-below).
-.SS Special Parameters
-.PP
-The shell treats several parameters specially. These parameters may
-only be referenced; assignment to them is not allowed.
-.PD 0
-.TP
-.B *
-Expands to the positional parameters, starting from one.
-When the expansion is not within double quotes, each positional parameter
-expands to a separate word.
-In contexts where it is performed, those words
-are subject to further word splitting and pathname expansion.
-When the expansion occurs within double quotes, it expands to a single word
-with the value of each parameter separated by the first character
-of the
-.SM
-.B IFS
-special variable. That is, "\fB$*\fP" is equivalent
-to "\fB$1\fP\fIc\fP\fB$2\fP\fIc\fP\fB...\fP", where
-.I c
-is the first character of the value of the
-.SM
-.B IFS
-variable. If
-.SM
-.B IFS
-is unset, the parameters are separated by spaces.
-If
-.SM
-.B IFS
-is null, the parameters are joined without intervening separators.
-.TP
-.B @
-Expands to the positional parameters, starting from one. When the
-expansion occurs within double quotes, each parameter expands to a
-separate word. That is, "\fB$@\fP" is equivalent to
-"\fB$1\fP" "\fB$2\fP" ...
-If the double-quoted expansion occurs within a word, the expansion of
-the first parameter is joined with the beginning part of the original
-word, and the expansion of the last parameter is joined with the last
-part of the original word.
-When there are no positional parameters, "\fB$@\fP" and
-.B $@
-expand to nothing (i.e., they are removed).
-.TP
-.B #
-Expands to the number of positional parameters in decimal.
-.TP
-.B ?
-Expands to the exit status of the most recently executed foreground
-pipeline.
-.TP
-.B \-
-Expands to the current option flags as specified upon invocation,
-by the
-.B set
-builtin command, or those set by the shell itself
-(such as the
-.B \-i
-option).
-.TP
-.B $
-Expands to the process ID of the shell. In a () subshell, it
-expands to the process ID of the current shell, not the
-subshell.
-.TP
-.B !
-Expands to the process ID of the job most recently placed into the
-background, whether executed as an asynchronous command or using
-the \fBbg\fP builtin (see
-.SM
-.B "JOB CONTROL"
-below).
-.TP
-.B 0
-Expands to the name of the shell or shell script. This is set at
-shell initialization. If
-.B bash
-is invoked with a file of commands,
-.B $0
-is set to the name of that file. If
-.B bash
-is started with the
-.B \-c
-option, then
-.B $0
-is set to the first argument after the string to be
-executed, if one is present. Otherwise, it is set
-to the filename used to invoke
-.BR bash ,
-as given by argument zero.
-.TP
-.B _
-At shell startup, set to the absolute pathname used to invoke the
-shell or shell script being executed as passed in the environment
-or argument list.
-Subsequently, expands to the last argument to the previous command,
-after expansion.
-Also set to the full pathname used to invoke each command executed
-and placed in the environment exported to that command.
-When checking mail, this parameter holds the name of the mail file
-currently being checked.
-.PD
-.SS Shell Variables
-.PP
-The following variables are set by the shell:
-.PP
-.PD 0
-.TP
-.B BASH
-Expands to the full filename used to invoke this instance of
-.BR bash .
-.TP
-.B BASHOPTS
-A colon-separated list of enabled shell options. Each word in
-the list is a valid argument for the
-.B \-s
-option to the
-.B shopt
-builtin command (see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below). The options appearing in
-.SM
-.B BASHOPTS
-are those reported as
-.I on
-by \fBshopt\fP.
-If this variable is in the environment when
-.B bash
-starts up, each shell option in the list will be enabled before
-reading any startup files.
-This variable is read-only.
-.TP
-.B BASHPID
-Expands to the process ID of the current \fBbash\fP process.
-This differs from \fB$$\fP under certain circumstances, such as subshells
-that do not require \fBbash\fP to be re-initialized.
-.TP
-.B BASH_ALIASES
-An associative array variable whose members correspond to the internal
-list of aliases as maintained by the \fBalias\fP builtin.
-Elements added to this array appear in the alias list; unsetting array
-elements cause aliases to be removed from the alias list.
-.TP
-.B BASH_ARGC
-An array variable whose values are the number of parameters in each
-frame of the current \fBbash\fP execution call stack.
-The number of
-parameters to the current subroutine (shell function or script executed
-with \fB.\fP or \fBsource\fP) is at the top of the stack.
-When a subroutine is executed, the number of parameters passed is pushed onto
-.SM
-.BR BASH_ARGC .
-The shell sets
-.SM
-.B BASH_ARGC
-only when in extended debugging mode (see the description of the
-.B extdebug
-option to the
-.B shopt
-builtin below)
-.TP
-.B BASH_ARGV
-An array variable containing all of the parameters in the current \fBbash\fP
-execution call stack. The final parameter of the last subroutine call
-is at the top of the stack; the first parameter of the initial call is
-at the bottom. When a subroutine is executed, the parameters supplied
-are pushed onto
-.SM
-.BR BASH_ARGV .
-The shell sets
-.SM
-.B BASH_ARGV
-only when in extended debugging mode
-(see the description of the
-.B extdebug
-option to the
-.B shopt
-builtin below)
-.TP
-.B BASH_CMDS
-An associative array variable whose members correspond to the internal
-hash table of commands as maintained by the \fBhash\fP builtin.
-Elements added to this array appear in the hash table; unsetting array
-elements cause commands to be removed from the hash table.
-.TP
-.B BASH_COMMAND
-The command currently being executed or about to be executed, unless the
-shell is executing a command as the result of a trap,
-in which case it is the command executing at the time of the trap.
-.TP
-.B BASH_EXECUTION_STRING
-The command argument to the \fB\-c\fP invocation option.
-.TP
-.B BASH_LINENO
-An array variable whose members are the line numbers in source files
-where each corresponding member of
-.SM
-.B FUNCNAME
-was invoked.
-\fB${BASH_LINENO[\fP\fI$i\fP\fB]}\fP is the line number in the source
-file (\fB${BASH_SOURCE[\fP\fI$i+1\fP\fB]}\fP) where
-\fB${FUNCNAME[\fP\fI$i\fP\fB]}\fP was called
-(or \fB${BASH_LINENO[\fP\fI$i-1\fP\fB]}\fP if referenced within another
-shell function).
-Use
-.SM
-.B LINENO
-to obtain the current line number.
-.TP
-.B BASH_REMATCH
-An array variable whose members are assigned by the \fB=~\fP binary
-operator to the \fB[[\fP conditional command.
-The element with index 0 is the portion of the string
-matching the entire regular expression.
-The element with index \fIn\fP is the portion of the
-string matching the \fIn\fPth parenthesized subexpression.
-This variable is read-only.
-.TP
-.B BASH_SOURCE
-An array variable whose members are the source filenames
-where the corresponding shell function names in the
-.SM
-.B FUNCNAME
-array variable are defined.
-The shell function
-\fB${FUNCNAME[\fP\fI$i\fP\fB]}\fP is defined in the file
-\fB${BASH_SOURCE[\fP\fI$i\fP\fB]}\fP and called from
-\fB${BASH_SOURCE[\fP\fI$i+1\fP\fB]}\fP.
-.TP
-.B BASH_SUBSHELL
-Incremented by one within each subshell or subshell environment when
-the shell begins executing in that environment.
-The initial value is 0.
-.TP
-.B BASH_VERSINFO
-A readonly array variable whose members hold version information for
-this instance of
-.BR bash .
-The values assigned to the array members are as follows:
-.sp .5
-.RS
-.TP 24
-.B BASH_VERSINFO[\fR0\fP]
-The major version number (the \fIrelease\fP).
-.TP
-.B BASH_VERSINFO[\fR1\fP]
-The minor version number (the \fIversion\fP).
-.TP
-.B BASH_VERSINFO[\fR2\fP]
-The patch level.
-.TP
-.B BASH_VERSINFO[\fR3\fP]
-The build version.
-.TP
-.B BASH_VERSINFO[\fR4\fP]
-The release status (e.g., \fIbeta1\fP).
-.TP
-.B BASH_VERSINFO[\fR5\fP]
-The value of
-.SM
-.BR MACHTYPE .
-.RE
-.TP
-.B BASH_VERSION
-Expands to a string describing the version of this instance of
-.BR bash .
-.TP
-.B COMP_CWORD
-An index into \fB${COMP_WORDS}\fP of the word containing the current
-cursor position.
-This variable is available only in shell functions invoked by the
-programmable completion facilities (see \fBProgrammable Completion\fP
-below).
-.TP
-.B COMP_KEY
-The key (or final key of a key sequence) used to invoke the current
-completion function.
-.TP
-.B COMP_LINE
-The current command line.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (see \fBProgrammable Completion\fP
-below).
-.TP
-.B COMP_POINT
-The index of the current cursor position relative to the beginning of
-the current command.
-If the current cursor position is at the end of the current command,
-the value of this variable is equal to \fB${#COMP_LINE}\fP.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (see \fBProgrammable Completion\fP
-below).
-.TP
-.B COMP_TYPE
-Set to an integer value corresponding to the type of completion attempted
-that caused a completion function to be called:
-\fITAB\fP, for normal completion,
-\fI?\fP, for listing completions after successive tabs,
-\fI!\fP, for listing alternatives on partial word completion,
-\fI@\fP, to list completions if the word is not unmodified,
-or
-\fI%\fP, for menu completion.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (see \fBProgrammable Completion\fP
-below).
-.TP
-.B COMP_WORDBREAKS
-The set of characters that the \fBreadline\fP library treats as word
-separators when performing word completion.
-If
-.SM
-.B COMP_WORDBREAKS
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B COMP_WORDS
-An array variable (see \fBArrays\fP below) consisting of the individual
-words in the current command line.
-The line is split into words as \fBreadline\fP would split it, using
-.SM
-.B COMP_WORDBREAKS
-as described above.
-This variable is available only in shell functions invoked by the
-programmable completion facilities (see \fBProgrammable Completion\fP
-below).
-.TP
-.B COPROC
-An array variable (see \fBArrays\fP below) created to hold the file descriptors
-for output from and input to an unnamed coprocess (see \fBCoprocesses\fP
-above).
-.TP
-.B DIRSTACK
-An array variable (see
-.B Arrays
-below) containing the current contents of the directory stack.
-Directories appear in the stack in the order they are displayed by the
-.B dirs
-builtin.
-Assigning to members of this array variable may be used to modify
-directories already in the stack, but the
-.B pushd
-and
-.B popd
-builtins must be used to add and remove directories.
-Assignment to this variable will not change the current directory.
-If
-.SM
-.B DIRSTACK
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B EUID
-Expands to the effective user ID of the current user, initialized at
-shell startup. This variable is readonly.
-.TP
-.B FUNCNAME
-An array variable containing the names of all shell functions
-currently in the execution call stack.
-The element with index 0 is the name of any currently-executing
-shell function.
-The bottom-most element (the one with the highest index) is
-.if t \f(CW"main"\fP.
-.if n "main".
-This variable exists only when a shell function is executing.
-Assignments to
-.SM
-.B FUNCNAME
-have no effect and return an error status.
-If
-.SM
-.B FUNCNAME
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.if t .sp 0.5
-.if n .sp 1
-This variable can be used with \fBBASH_LINENO\fP and \fBBASH_SOURCE\fP.
-Each element of \fBFUNCNAME\fP has corresponding elements in
-\fBBASH_LINENO\fP and \fBBASH_SOURCE\fP to describe the call stack.
-For instance, \fB${FUNCNAME[\fP\fI$i\fP\fB]}\fP was called from the file
-\fB${BASH_SOURCE[\fP\fI$i+1\fP\fB]}\fP at line number
-\fB${BASH_LINENO[\fP\fI$i\fP\fB]}\fP.
-The \fBcaller\fP builtin displays the current call stack using this
-information.
-.TP
-.B GROUPS
-An array variable containing the list of groups of which the current
-user is a member.
-Assignments to
-.SM
-.B GROUPS
-have no effect and return an error status.
-If
-.SM
-.B GROUPS
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B HISTCMD
-The history number, or index in the history list, of the current
-command.
-If
-.SM
-.B HISTCMD
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B HOSTNAME
-Automatically set to the name of the current host.
-.TP
-.B HOSTTYPE
-Automatically set to a string that uniquely
-describes the type of machine on which
-.B bash
-is executing.
-The default is system-dependent.
-.TP
-.B LINENO
-Each time this parameter is referenced, the shell substitutes
-a decimal number representing the current sequential line number
-(starting with 1) within a script or function. When not in a
-script or function, the value substituted is not guaranteed to
-be meaningful.
-If
-.SM
-.B LINENO
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B MACHTYPE
-Automatically set to a string that fully describes the system
-type on which
-.B bash
-is executing, in the standard GNU \fIcpu-company-system\fP format.
-The default is system-dependent.
-.TP
-.B MAPFILE
-An array variable (see \fBArrays\fP below) created to hold the text
-read by the \fBmapfile\fP builtin when no variable name is supplied.
-.TP
-.B OLDPWD
-The previous working directory as set by the
-.B cd
-command.
-.TP
-.B OPTARG
-The value of the last option argument processed by the
-.B getopts
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.TP
-.B OPTIND
-The index of the next argument to be processed by the
-.B getopts
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.TP
-.B OSTYPE
-Automatically set to a string that
-describes the operating system on which
-.B bash
-is executing.
-The default is system-dependent.
-.TP
-.B PIPESTATUS
-An array variable (see
-.B Arrays
-below) containing a list of exit status values from the processes
-in the most-recently-executed foreground pipeline (which may
-contain only a single command).
-.TP
-.B PPID
-The process ID of the shell's parent. This variable is readonly.
-.TP
-.B PWD
-The current working directory as set by the
-.B cd
-command.
-.TP
-.B RANDOM
-Each time this parameter is referenced, a random integer between
-0 and 32767 is
-generated. The sequence of random numbers may be initialized by assigning
-a value to
-.SM
-.BR RANDOM .
-If
-.SM
-.B RANDOM
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B READLINE_LINE
-The contents of the
-.B readline
-line buffer, for use with
-.if t \f(CWbind -x\fP
-.if n "bind -x"
-(see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below).
-.TP
-.B READLINE_POINT
-The position of the insertion point in the
-.B readline
-line buffer, for use with
-.if t \f(CWbind -x\fP
-.if n "bind -x"
-(see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below).
-.TP
-.B REPLY
-Set to the line of input read by the
-.B read
-builtin command when no arguments are supplied.
-.TP
-.B SECONDS
-Each time this parameter is
-referenced, the number of seconds since shell invocation is returned. If a
-value is assigned to
-.SM
-.BR SECONDS ,
-the value returned upon subsequent
-references is
-the number of seconds since the assignment plus the value assigned.
-If
-.SM
-.B SECONDS
-is unset, it loses its special properties, even if it is
-subsequently reset.
-.TP
-.B SHELLOPTS
-A colon-separated list of enabled shell options. Each word in
-the list is a valid argument for the
-.B \-o
-option to the
-.B set
-builtin command (see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below). The options appearing in
-.SM
-.B SHELLOPTS
-are those reported as
-.I on
-by \fBset \-o\fP.
-If this variable is in the environment when
-.B bash
-starts up, each shell option in the list will be enabled before
-reading any startup files.
-This variable is read-only.
-.TP
-.B SHLVL
-Incremented by one each time an instance of
-.B bash
-is started.
-.TP
-.B UID
-Expands to the user ID of the current user, initialized at shell startup.
-This variable is readonly.
-.PD
-.PP
-The following variables are used by the shell. In some cases,
-.B bash
-assigns a default value to a variable; these cases are noted
-below.
-.PP
-.PD 0
-.TP
-.B BASH_COMPAT
-The value is used to set the shell's compatibility level.
-See the description of the \fBshopt\fP builtin below under
-\fBSHELL BUILTIN COMMANDS\fP
-for a description of the various compatibility
-levels and their effects.
-The value may be a decimal number (e.g., 4.2) or an integer (e.g., 42)
-corresponding to the desired compatibility level.
-If \fBBASH_COMPAT\fP is unset or set to the empty string, the compatibility
-level is set to the default for the current version.
-If \fBBASH_COMPAT\fP is set to a value that is not one of the valid
-compatibility levels, the shell prints an error message and sets the
-compatibility level to the default for the current version.
-The valid compatibility levels correspond to the compatibility options
-accepted by the \fBshopt\fP builtin described below (for example,
-\fBcompat42\fP means that 4.2 and 42 are valid values).
-The current version is also a valid value.
-.TP
-.B BASH_ENV
-If this parameter is set when \fBbash\fP is executing a shell script,
-its value is interpreted as a filename containing commands to
-initialize the shell, as in
-.IR ~/.bashrc .
-The value of
-.SM
-.B BASH_ENV
-is subjected to parameter expansion, command substitution, and arithmetic
-expansion before being interpreted as a filename.
-.SM
-.B PATH
-is not used to search for the resultant filename.
-.TP
-.B BASH_XTRACEFD
-If set to an integer corresponding to a valid file descriptor, \fBbash\fP
-will write the trace output generated when
-.if t \f(CWset -x\fP
-.if n \fIset -x\fP
-is enabled to that file descriptor.
-The file descriptor is closed when
-.SM
-.B BASH_XTRACEFD
-is unset or assigned a new value.
-Unsetting
-.SM
-.B BASH_XTRACEFD
-or assigning it the empty string causes the
-trace output to be sent to the standard error.
-Note that setting
-.SM
-.B BASH_XTRACEFD
-to 2 (the standard error file
-descriptor) and then unsetting it will result in the standard error
-being closed.
-.TP
-.B CDPATH
-The search path for the
-.B cd
-command.
-This is a colon-separated list of directories in which the shell looks
-for destination directories specified by the
-.B cd
-command.
-A sample value is
-.if t \f(CW".:~:/usr"\fP.
-.if n ".:~:/usr".
-.TP
-.B CHILD_MAX
-Set the number of exited child status values for the shell to remember.
-Bash will not allow this value to be decreased below a POSIX-mandated
-minimum, and there is a maximum value (currently 8192) that this may
-not exceed.
-The minimum value is system-dependent.
-.TP
-.B COLUMNS
-Used by the \fBselect\fP compound command to determine the terminal width
-when printing selection lists.
-Automatically set if the
-.B checkwinsize
-option is enabled or in an interactive shell upon receipt of a
-.SM
-.BR SIGWINCH .
-.TP
-.B COMPREPLY
-An array variable from which \fBbash\fP reads the possible completions
-generated by a shell function invoked by the programmable completion
-facility (see \fBProgrammable Completion\fP below).
-Each array element contains one possible completion.
-.TP
-.B EMACS
-If \fBbash\fP finds this variable in the environment when the shell starts
-with value
-.if t \f(CWt\fP,
-.if n "t",
-it assumes that the shell is running in an Emacs shell buffer and disables
-line editing.
-.TP
-.B ENV
-Similar to
-.SM
-.BR BASH_ENV ;
-used when the shell is invoked in POSIX mode.
-.TP
-.B FCEDIT
-The default editor for the
-.B fc
-builtin command.
-.TP
-.B FIGNORE
-A colon-separated list of suffixes to ignore when performing
-filename completion (see
-.SM
-.B READLINE
-below).
-A filename whose suffix matches one of the entries in
-.SM
-.B FIGNORE
-is excluded from the list of matched filenames.
-A sample value is
-.if t \f(CW".o:~"\fP.
-.if n ".o:~".
-.TP
-.B FUNCNEST
-If set to a numeric value greater than 0, defines a maximum function
-nesting level. Function invocations that exceed this nesting level
-will cause the current command to abort.
-.TP
-.B GLOBIGNORE
-A colon-separated list of patterns defining the set of filenames to
-be ignored by pathname expansion.
-If a filename matched by a pathname expansion pattern also matches one
-of the patterns in
-.SM
-.BR GLOBIGNORE ,
-it is removed from the list of matches.
-.TP
-.B HISTCONTROL
-A colon-separated list of values controlling how commands are saved on
-the history list.
-If the list of values includes
-.IR ignorespace ,
-lines which begin with a
-.B space
-character are not saved in the history list.
-A value of
-.I ignoredups
-causes lines matching the previous history entry to not be saved.
-A value of
-.I ignoreboth
-is shorthand for \fIignorespace\fP and \fIignoredups\fP.
-A value of
-.IR erasedups
-causes all previous lines matching the current line to be removed from
-the history list before that line is saved.
-Any value not in the above list is ignored.
-If
-.SM
-.B HISTCONTROL
-is unset, or does not include a valid value,
-all lines read by the shell parser are saved on the history list,
-subject to the value of
-.SM
-.BR HISTIGNORE .
-The second and subsequent lines of a multi-line compound command are
-not tested, and are added to the history regardless of the value of
-.SM
-.BR HISTCONTROL .
-.TP
-.B HISTFILE
-The name of the file in which command history is saved (see
-.SM
-.B HISTORY
-below). The default value is \fI~/.bash_history\fP. If unset, the
-command history is not saved when a shell exits.
-.TP
-.B HISTFILESIZE
-The maximum number of lines contained in the history file. When this
-variable is assigned a value, the history file is truncated, if
-necessary,
-to contain no more than that number of lines by removing the oldest entries.
-The history file is also truncated to this size after
-writing it when a shell exits.
-If the value is 0, the history file is truncated to zero size.
-Non-numeric values and numeric values less than zero inhibit truncation.
-The shell sets the default value to the value of \fBHISTSIZE\fP
-after reading any startup files.
-.TP
-.B HISTIGNORE
-A colon-separated list of patterns used to decide which command lines
-should be saved on the history list. Each pattern is anchored at the
-beginning of the line and must match the complete line (no implicit
-`\fB*\fP' is appended). Each pattern is tested against the line
-after the checks specified by
-.SM
-.B HISTCONTROL
-are applied.
-In addition to the normal shell pattern matching characters, `\fB&\fP'
-matches the previous history line. `\fB&\fP' may be escaped using a
-backslash; the backslash is removed before attempting a match.
-The second and subsequent lines of a multi-line compound command are
-not tested, and are added to the history regardless of the value of
-.SM
-.BR HISTIGNORE .
-.TP
-.B HISTSIZE
-The number of commands to remember in the command history (see
-.SM
-.B HISTORY
-below).
-If the value is 0, commands are not saved in the history list.
-Numeric values less than zero result in every command being saved
-on the history list (there is no limit).
-The shell sets the default value to 500 after reading any startup files.
-.TP
-.B HISTTIMEFORMAT
-If this variable is set and not null, its value is used as a format string
-for \fIstrftime\fP(3) to print the time stamp associated with each history
-entry displayed by the \fBhistory\fP builtin.
-If this variable is set, time stamps are written to the history file so
-they may be preserved across shell sessions.
-This uses the history comment character to distinguish timestamps from
-other history lines.
-.TP
-.B HOME
-The home directory of the current user; the default argument for the
-\fBcd\fP builtin command.
-The value of this variable is also used when performing tilde expansion.
-.TP
-.B HOSTFILE
-Contains the name of a file in the same format as
-.FN /etc/hosts
-that should be read when the shell needs to complete a
-hostname.
-The list of possible hostname completions may be changed while the
-shell is running;
-the next time hostname completion is attempted after the
-value is changed,
-.B bash
-adds the contents of the new file to the existing list.
-If
-.SM
-.B HOSTFILE
-is set, but has no value, or does not name a readable file,
-\fBbash\fP attempts to read
-.FN /etc/hosts
-to obtain the list of possible hostname completions.
-When
-.SM
-.B HOSTFILE
-is unset, the hostname list is cleared.
-.TP
-.B IFS
-The
-.I Internal Field Separator
-that is used
-for word splitting after expansion and to
-split lines into words with the
-.B read
-builtin command. The default value is
-``<space><tab><newline>''.
-.TP
-.B IGNOREEOF
-Controls the
-action of an interactive shell on receipt of an
-.SM
-.B EOF
-character as the sole input. If set, the value is the number of
-consecutive
-.SM
-.B EOF
-characters which must be
-typed as the first characters on an input line before
-.B bash
-exits. If the variable exists but does not have a numeric value, or
-has no value, the default value is 10. If it does not exist,
-.SM
-.B EOF
-signifies the end of input to the shell.
-.TP
-.B INPUTRC
-The filename for the
-.B readline
-startup file, overriding the default of
-.FN ~/.inputrc
-(see
-.SM
-.B READLINE
-below).
-.TP
-.B LANG
-Used to determine the locale category for any category not specifically
-selected with a variable starting with \fBLC_\fP.
-.TP
-.B LC_ALL
-This variable overrides the value of
-.SM
-.B LANG
-and any other
-\fBLC_\fP variable specifying a locale category.
-.TP
-.B LC_COLLATE
-This variable determines the collation order used when sorting the
-results of pathname expansion, and determines the behavior of range
-expressions, equivalence classes, and collating sequences within
-pathname expansion and pattern matching.
-.TP
-.B LC_CTYPE
-This variable determines the interpretation of characters and the
-behavior of character classes within pathname expansion and pattern
-matching.
-.TP
-.B LC_MESSAGES
-This variable determines the locale used to translate double-quoted
-strings preceded by a \fB$\fP.
-.TP
-.B LC_NUMERIC
-This variable determines the locale category used for number formatting.
-.TP
-.B LINES
-Used by the \fBselect\fP compound command to determine the column length
-for printing selection lists.
-Automatically set if the
-.B checkwinsize
-option is enabled or in an interactive shell upon receipt of a
-.SM
-.BR SIGWINCH .
-.TP
-.B MAIL
-If this parameter is set to a file or directory name and the
-.SM
-.B MAILPATH
-variable is not set,
-.B bash
-informs the user of the arrival of mail in the specified file or
-Maildir-format directory.
-.TP
-.B MAILCHECK
-Specifies how
-often (in seconds)
-.B bash
-checks for mail. The default is 60 seconds. When it is time to check
-for mail, the shell does so before displaying the primary prompt.
-If this variable is unset, or set to a value that is not a number
-greater than or equal to zero, the shell disables mail checking.
-.TP
-.B MAILPATH
-A colon-separated list of filenames to be checked for mail.
-The message to be printed when mail arrives in a particular file
-may be specified by separating the filename from the message with a `?'.
-When used in the text of the message, \fB$_\fP expands to the name of
-the current mailfile.
-Example:
-.RS
-.PP
-\fBMAILPATH\fP=\(aq/var/mail/bfox?"You have mail":~/shell\-mail?"$_ has mail!"\(aq
-.PP
-.B Bash
-supplies a default value for this variable, but the location of the user
-mail files that it uses is system dependent (e.g., /var/mail/\fB$USER\fP).
-.RE
-.TP
-.B OPTERR
-If set to the value 1,
-.B bash
-displays error messages generated by the
-.B getopts
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.SM
-.B OPTERR
-is initialized to 1 each time the shell is invoked or a shell
-script is executed.
-.TP
-.B PATH
-The search path for commands. It
-is a colon-separated list of directories in which
-the shell looks for commands (see
-.SM
-.B COMMAND EXECUTION
-below).
-A zero-length (null) directory name in the value of
-.SM
-.B PATH
-indicates the current directory.
-A null directory name may appear as two adjacent colons, or as an initial
-or trailing colon.
-The default path is system-dependent,
-and is set by the administrator who installs
-.BR bash .
-A common value is
-.if t \f(CW/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin\fP.
-.if n ``/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin''.
-.TP
-.B POSIXLY_CORRECT
-If this variable is in the environment when \fBbash\fP starts, the shell
-enters \fIposix mode\fP before reading the startup files, as if the
-.B \-\-posix
-invocation option had been supplied. If it is set while the shell is
-running, \fBbash\fP enables \fIposix mode\fP, as if the command
-.if t \f(CWset -o posix\fP
-.if n \fIset -o posix\fP
-had been executed.
-.TP
-.B PROMPT_COMMAND
-If set, the value is executed as a command prior to issuing each primary
-prompt.
-.TP
-.B PROMPT_DIRTRIM
-If set to a number greater than zero, the value is used as the number of
-trailing directory components to retain when expanding the \fB\ew\fP and
-\fB\eW\fP prompt string escapes (see
-.SM
-.B PROMPTING
-below). Characters removed are replaced with an ellipsis.
-.TP
-.B PS1
-The value of this parameter is expanded (see
-.SM
-.B PROMPTING
-below) and used as the primary prompt string. The default value is
-``\fB\es\-\ev\e$ \fP''.
-.TP
-.B PS2
-The value of this parameter is expanded as with
-.SM
-.B PS1
-and used as the secondary prompt string. The default is
-``\fB> \fP''.
-.TP
-.B PS3
-The value of this parameter is used as the prompt for the
-.B select
-command (see
-.SM
-.B SHELL GRAMMAR
-above).
-.TP
-.B PS4
-The value of this parameter is expanded as with
-.SM
-.B PS1
-and the value is printed before each command
-.B bash
-displays during an execution trace. The first character of
-.SM
-.B PS4
-is replicated multiple times, as necessary, to indicate multiple
-levels of indirection. The default is ``\fB+ \fP''.
-.TP
-.B SHELL
-The full pathname to the shell is kept in this environment variable.
-If it is not set when the shell starts,
-.B bash
-assigns to it the full pathname of the current user's login shell.
-.TP
-.B TIMEFORMAT
-The value of this parameter is used as a format string specifying
-how the timing information for pipelines prefixed with the
-.B time
-reserved word should be displayed.
-The \fB%\fP character introduces an escape sequence that is
-expanded to a time value or other information.
-The escape sequences and their meanings are as follows; the
-braces denote optional portions.
-.sp .5
-.RS
-.PD 0
-.TP 10
-.B %%
-A literal \fB%\fP.
-.TP
-.B %[\fIp\fP][l]R
-The elapsed time in seconds.
-.TP
-.B %[\fIp\fP][l]U
-The number of CPU seconds spent in user mode.
-.TP
-.B %[\fIp\fP][l]S
-The number of CPU seconds spent in system mode.
-.TP
-.B %P
-The CPU percentage, computed as (%U + %S) / %R.
-.PD
-.RE
-.IP
-The optional \fIp\fP is a digit specifying the \fIprecision\fP,
-the number of fractional digits after a decimal point.
-A value of 0 causes no decimal point or fraction to be output.
-At most three places after the decimal point may be specified;
-values of \fIp\fP greater than 3 are changed to 3.
-If \fIp\fP is not specified, the value 3 is used.
-.IP
-The optional \fBl\fP specifies a longer format, including
-minutes, of the form \fIMM\fPm\fISS\fP.\fIFF\fPs.
-The value of \fIp\fP determines whether or not the fraction is
-included.
-.IP
-If this variable is not set, \fBbash\fP acts as if it had the
-value \fB$\(aq\enreal\et%3lR\enuser\et%3lU\ensys\et%3lS\(aq\fP.
-If the value is null, no timing information is displayed.
-A trailing newline is added when the format string is displayed.
-.PD 0
-.TP
-.B TMOUT
-If set to a value greater than zero,
-.SM
-.B TMOUT
-is treated as the
-default timeout for the \fBread\fP builtin.
-The \fBselect\fP command terminates if input does not arrive
-after
-.SM
-.B TMOUT
-seconds when input is coming from a terminal.
-In an interactive shell, the value is interpreted as the
-number of seconds to wait for a line of input after issuing the
-primary prompt.
-.B Bash
-terminates after waiting for that number of seconds if a complete
-line of input does not arrive.
-.TP
-.B TMPDIR
-If set, \fBbash\fP uses its value as the name of a directory in which
-\fBbash\fP creates temporary files for the shell's use.
-.TP
-.B auto_resume
-This variable controls how the shell interacts with the user and
-job control. If this variable is set, single word simple
-commands without redirections are treated as candidates for resumption
-of an existing stopped job. There is no ambiguity allowed; if there is
-more than one job beginning with the string typed, the job most recently
-accessed is selected. The
-.I name
-of a stopped job, in this context, is the command line used to
-start it.
-If set to the value
-.IR exact ,
-the string supplied must match the name of a stopped job exactly;
-if set to
-.IR substring ,
-the string supplied needs to match a substring of the name of a
-stopped job. The
-.I substring
-value provides functionality analogous to the
-.B %?
-job identifier (see
-.SM
-.B JOB CONTROL
-below). If set to any other value, the supplied string must
-be a prefix of a stopped job's name; this provides functionality
-analogous to the \fB%\fP\fIstring\fP job identifier.
-.TP
-.B histchars
-The two or three characters which control history expansion
-and tokenization (see
-.SM
-.B HISTORY EXPANSION
-below). The first character is the \fIhistory expansion\fP character,
-the character which signals the start of a history
-expansion, normally `\fB!\fP'.
-The second character is the \fIquick substitution\fP
-character, which is used as shorthand for re-running the previous
-command entered, substituting one string for another in the command.
-The default is `\fB^\fP'.
-The optional third character is the character
-which indicates that the remainder of the line is a comment when found
-as the first character of a word, normally `\fB#\fP'. The history
-comment character causes history substitution to be skipped for the
-remaining words on the line. It does not necessarily cause the shell
-parser to treat the rest of the line as a comment.
-.PD
-.SS Arrays
-.B Bash
-provides one-dimensional indexed and associative array variables.
-Any variable may be used as an indexed array; the
-.B declare
-builtin will explicitly declare an array.
-There is no maximum
-limit on the size of an array, nor any requirement that members
-be indexed or assigned contiguously.
-Indexed arrays are referenced using integers (including arithmetic
-expressions) and are zero-based; associative arrays are referenced
-using arbitrary strings.
-Unless otherwise noted, indexed array indices must be non-negative integers.
-.PP
-An indexed array is created automatically if any variable is assigned to
-using the syntax \fIname\fP[\fIsubscript\fP]=\fIvalue\fP. The
-.I subscript
-is treated as an arithmetic expression that must evaluate to a number.
-To explicitly declare an indexed array, use
-.B declare \-a \fIname\fP
-(see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.B declare \-a \fIname\fP[\fIsubscript\fP]
-is also accepted; the \fIsubscript\fP is ignored.
-.PP
-Associative arrays are created using
-.BR "declare \-A \fIname\fP" .
-.PP
-Attributes may be
-specified for an array variable using the
-.B declare
-and
-.B readonly
-builtins. Each attribute applies to all members of an array.
-.PP
-Arrays are assigned to using compound assignments of the form
-\fIname\fP=\fB(\fPvalue\fI1\fP ... value\fIn\fP\fB)\fP, where each
-\fIvalue\fP is of the form [\fIsubscript\fP]=\fIstring\fP.
-Indexed array assignments do not require anything but \fIstring\fP.
-When assigning to indexed arrays, if the optional brackets and subscript
-are supplied, that index is assigned to;
-otherwise the index of the element assigned is the last index assigned
-to by the statement plus one. Indexing starts at zero.
-.PP
-When assigning to an associative array, the subscript is required.
-.PP
-This syntax is also accepted by the
-.B declare
-builtin. Individual array elements may be assigned to using the
-\fIname\fP[\fIsubscript\fP]=\fIvalue\fP syntax introduced above.
-When assigning to an indexed array, if
-.I name
-is subscripted by a negative number, that number is
-interpreted as relative to one greater than the maximum index of
-\fIname\fP, so negative indices count back from the end of the
-array, and an index of \-1 references the last element.
-.PP
-Any element of an array may be referenced using
-${\fIname\fP[\fIsubscript\fP]}. The braces are required to avoid
-conflicts with pathname expansion. If
-\fIsubscript\fP is \fB@\fP or \fB*\fP, the word expands to
-all members of \fIname\fP. These subscripts differ only when the
-word appears within double quotes. If the word is double-quoted,
-${\fIname\fP[*]} expands to a single
-word with the value of each array member separated by the first
-character of the
-.SM
-.B IFS
-special variable, and ${\fIname\fP[@]} expands each element of
-\fIname\fP to a separate word. When there are no array members,
-${\fIname\fP[@]} expands to nothing.
-If the double-quoted expansion occurs within a word, the expansion of
-the first parameter is joined with the beginning part of the original
-word, and the expansion of the last parameter is joined with the last
-part of the original word.
-This is analogous to the expansion
-of the special parameters \fB*\fP and \fB@\fP (see
-.B Special Parameters
-above). ${#\fIname\fP[\fIsubscript\fP]} expands to the length of
-${\fIname\fP[\fIsubscript\fP]}. If \fIsubscript\fP is \fB*\fP or
-\fB@\fP, the expansion is the number of elements in the array.
-Referencing an array variable without a subscript is equivalent to
-referencing the array with a subscript of 0.
-If the
-.I subscript
-used to reference an element of an indexed array
-evaluates to a number less than zero, it is
-interpreted as relative to one greater than the maximum index of the array,
-so negative indices count back from the end of the
-array, and an index of \-1 references the last element.
-.PP
-An array variable is considered set if a subscript has been assigned a
-value. The null string is a valid value.
-.PP
-It is possible to obtain the keys (indices) of an array as well as the values.
-${\fB!\fP\fIname\fP[\fI@\fP]} and ${\fB!\fP\fIname\fP[\fI*\fP]}
-expand to the indices assigned in array variable \fIname\fP.
-The treatment when in double quotes is similar to the expansion of the
-special parameters \fI@\fP and \fI*\fP within double quotes.
-.PP
-The
-.B unset
-builtin is used to destroy arrays. \fBunset\fP \fIname\fP[\fIsubscript\fP]
-destroys the array element at index \fIsubscript\fP.
-Negative subscripts to indexed arrays are interpreted as described above.
-Care must be taken to avoid unwanted side effects caused by pathname
-expansion.
-\fBunset\fP \fIname\fP, where \fIname\fP is an array, or
-\fBunset\fP \fIname\fP[\fIsubscript\fP], where
-\fIsubscript\fP is \fB*\fP or \fB@\fP, removes the entire array.
-.PP
-The
-.BR declare ,
-.BR local ,
-and
-.B readonly
-builtins each accept a
-.B \-a
-option to specify an indexed array and a
-.B \-A
-option to specify an associative array.
-If both options are supplied,
-.B \-A
-takes precedence.
-The
-.B read
-builtin accepts a
-.B \-a
-option to assign a list of words read from the standard input
-to an array. The
-.B set
-and
-.B declare
-builtins display array values in a way that allows them to be
-reused as assignments.
-.SH EXPANSION
-Expansion is performed on the command line after it has been split into
-words. There are seven kinds of expansion performed:
-.IR "brace expansion" ,
-.IR "tilde expansion" ,
-.IR "parameter and variable expansion" ,
-.IR "command substitution" ,
-.IR "arithmetic expansion" ,
-.IR "word splitting" ,
-and
-.IR "pathname expansion" .
-.PP
-The order of expansions is:
-brace expansion;
-tilde expansion, parameter and variable expansion, arithmetic expansion,
-and command substitution (done in a left-to-right fashion);
-word splitting;
-and pathname expansion.
-.PP
-On systems that can support it, there is an additional expansion
-available: \fIprocess substitution\fP.
-This is performed at the
-same time as tilde, parameter, variable, and arithmetic expansion and
-command substitution.
-.PP
-Only brace expansion, word splitting, and pathname expansion
-can change the number of words of the expansion; other expansions
-expand a single word to a single word.
-The only exceptions to this are the expansions of
-"\fB$@\fP" and "\fB${\fP\fIname\fP\fB[@]}\fP"
-as explained above (see
-.SM
-.BR PARAMETERS ).
-.SS Brace Expansion
-.PP
-.I "Brace expansion"
-is a mechanism by which arbitrary strings
-may be generated. This mechanism is similar to
-\fIpathname expansion\fP, but the filenames generated
-need not exist. Patterns to be brace expanded take
-the form of an optional
-.IR preamble ,
-followed by either a series of comma-separated strings or
-a sequence expression between a pair of braces, followed by
-an optional
-.IR postscript .
-The preamble is prefixed to each string contained
-within the braces, and the postscript is then appended
-to each resulting string, expanding left to right.
-.PP
-Brace expansions may be nested. The results of each expanded
-string are not sorted; left to right order is preserved.
-For example, a\fB{\fPd,c,b\fB}\fPe expands into `ade ace abe'.
-.PP
-A sequence expression takes the form
-\fB{\fP\fIx\fP\fB..\fP\fIy\fP\fB[..\fP\fIincr\fP\fB]}\fP,
-where \fIx\fP and \fIy\fP are either integers or single characters,
-and \fIincr\fP, an optional increment, is an integer.
-When integers are supplied, the expression expands to each number between
-\fIx\fP and \fIy\fP, inclusive.
-Supplied integers may be prefixed with \fI0\fP to force each term to have the
-same width.
-When either \fIx\fP or \fPy\fP begins with a zero, the shell
-attempts to force all generated terms to contain the same number of digits,
-zero-padding where necessary.
-When characters are supplied, the expression expands to each character
-lexicographically between \fIx\fP and \fIy\fP, inclusive,
-using the default C locale.
-Note that both \fIx\fP and \fIy\fP must be of the same type.
-When the increment is supplied, it is used as the difference between
-each term. The default increment is 1 or -1 as appropriate.
-.PP
-Brace expansion is performed before any other expansions,
-and any characters special to other expansions are preserved
-in the result. It is strictly textual.
-.B Bash
-does not apply any syntactic interpretation to the context of the
-expansion or the text between the braces.
-.PP
-A correctly-formed brace expansion must contain unquoted opening
-and closing braces, and at least one unquoted comma or a valid
-sequence expression.
-Any incorrectly formed brace expansion is left unchanged.
-A \fB{\fP or \fB,\fP may be quoted with a backslash to prevent its
-being considered part of a brace expression.
-To avoid conflicts with parameter expansion, the string \fB${\fP
-is not considered eligible for brace expansion.
-.PP
-This construct is typically used as shorthand when the common
-prefix of the strings to be generated is longer than in the
-above example:
-.RS
-.PP
-mkdir /usr/local/src/bash/{old,new,dist,bugs}
-.RE
-or
-.RS
-chown root /usr/{ucb/{ex,edit},lib/{ex?.?*,how_ex}}
-.RE
-.PP
-Brace expansion introduces a slight incompatibility with
-historical versions of
-.BR sh .
-.B sh
-does not treat opening or closing braces specially when they
-appear as part of a word, and preserves them in the output.
-.B Bash
-removes braces from words as a consequence of brace
-expansion. For example, a word entered to
-.B sh
-as \fIfile{1,2}\fP
-appears identically in the output. The same word is
-output as
-.I file1 file2
-after expansion by
-.BR bash .
-If strict compatibility with
-.B sh
-is desired, start
-.B bash
-with the
-.B +B
-option or disable brace expansion with the
-.B +B
-option to the
-.B set
-command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.SS Tilde Expansion
-.PP
-If a word begins with an unquoted tilde character (`\fB~\fP'), all of
-the characters preceding the first unquoted slash (or all characters,
-if there is no unquoted slash) are considered a \fItilde-prefix\fP.
-If none of the characters in the tilde-prefix are quoted, the
-characters in the tilde-prefix following the tilde are treated as a
-possible \fIlogin name\fP.
-If this login name is the null string, the tilde is replaced with the
-value of the shell parameter
-.SM
-.BR HOME .
-If
-.SM
-.B HOME
-is unset, the home directory of the user executing the shell is
-substituted instead.
-Otherwise, the tilde-prefix is replaced with the home directory
-associated with the specified login name.
-.PP
-If the tilde-prefix is a `~+', the value of the shell variable
-.SM
-.B PWD
-replaces the tilde-prefix.
-If the tilde-prefix is a `~\-', the value of the shell variable
-.SM
-.BR OLDPWD ,
-if it is set, is substituted.
-If the characters following the tilde in the tilde-prefix consist
-of a number \fIN\fP, optionally prefixed
-by a `+' or a `\-', the tilde-prefix is replaced with the corresponding
-element from the directory stack, as it would be displayed by the
-.B dirs
-builtin invoked with the tilde-prefix as an argument.
-If the characters following the tilde in the tilde-prefix consist of a
-number without a leading `+' or `\-', `+' is assumed.
-.PP
-If the login name is invalid, or the tilde expansion fails, the word
-is unchanged.
-.PP
-Each variable assignment is checked for unquoted tilde-prefixes immediately
-following a
-.B :
-or the first
-.BR = .
-In these cases, tilde expansion is also performed.
-Consequently, one may use filenames with tildes in assignments to
-.SM
-.BR PATH ,
-.SM
-.BR MAILPATH ,
-and
-.SM
-.BR CDPATH ,
-and the shell assigns the expanded value.
-.SS Parameter Expansion
-.PP
-The `\fB$\fP' character introduces parameter expansion,
-command substitution, or arithmetic expansion. The parameter name
-or symbol to be expanded may be enclosed in braces, which
-are optional but serve to protect the variable to be expanded from
-characters immediately following it which could be
-interpreted as part of the name.
-.PP
-When braces are used, the matching ending brace is the first `\fB}\fP'
-not escaped by a backslash or within a quoted string, and not within an
-embedded arithmetic expansion, command substitution, or parameter
-expansion.
-.PP
-.PD 0
-.TP
-${\fIparameter\fP}
-The value of \fIparameter\fP is substituted. The braces are required
-when
-.I parameter
-is a positional parameter with more than one digit,
-or when
-.I parameter
-is followed by a character which is not to be
-interpreted as part of its name.
-The \fIparameter\fP is a shell parameter as described above
-\fBPARAMETERS\fP) or an array reference (\fBArrays\fP).
-.PD
-.PP
-If the first character of \fIparameter\fP is an exclamation point (\fB!\fP),
-it introduces a level of variable indirection.
-\fBBash\fP uses the value of the variable formed from the rest of
-\fIparameter\fP as the name of the variable; this variable is then
-expanded and that value is used in the rest of the substitution, rather
-than the value of \fIparameter\fP itself.
-This is known as \fIindirect expansion\fP.
-The exceptions to this are the expansions of ${\fB!\fP\fIprefix\fP\fB*\fP} and
-${\fB!\fP\fIname\fP[\fI@\fP]} described below.
-The exclamation point must immediately follow the left brace in order to
-introduce indirection.
-.PP
-In each of the cases below, \fIword\fP is subject to tilde expansion,
-parameter expansion, command substitution, and arithmetic expansion.
-.PP
-When not performing substring expansion, using the forms documented below
-(e.g., \fB:-\fP),
-\fBbash\fP tests for a parameter that is unset or null. Omitting the colon
-results in a test only for a parameter that is unset.
-.PP
-.PD 0
-.TP
-${\fIparameter\fP\fB:\-\fP\fIword\fP}
-\fBUse Default Values\fP. If
-.I parameter
-is unset or null, the expansion of
-.I word
-is substituted. Otherwise, the value of
-.I parameter
-is substituted.
-.TP
-${\fIparameter\fP\fB:=\fP\fIword\fP}
-\fBAssign Default Values\fP.
-If
-.I parameter
-is unset or null, the expansion of
-.I word
-is assigned to
-.IR parameter .
-The value of
-.I parameter
-is then substituted. Positional parameters and special parameters may
-not be assigned to in this way.
-.TP
-${\fIparameter\fP\fB:?\fP\fIword\fP}
-\fBDisplay Error if Null or Unset\fP.
-If
-.I parameter
-is null or unset, the expansion of \fIword\fP (or a message to that effect
-if
-.I word
-is not present) is written to the standard error and the shell, if it
-is not interactive, exits. Otherwise, the value of \fIparameter\fP is
-substituted.
-.TP
-${\fIparameter\fP\fB:+\fP\fIword\fP}
-\fBUse Alternate Value\fP.
-If
-.I parameter
-is null or unset, nothing is substituted, otherwise the expansion of
-.I word
-is substituted.
-.TP
-${\fIparameter\fP\fB:\fP\fIoffset\fP}
-.PD 0
-.TP
-${\fIparameter\fP\fB:\fP\fIoffset\fP\fB:\fP\fIlength\fP}
-.PD
-\fBSubstring Expansion\fP.
-Expands to up to \fIlength\fP characters of the value of \fIparameter\fP
-starting at the character specified by \fIoffset\fP.
-If \fIparameter\fP is \fB@\fP, an indexed array subscripted by
-\fB@\fP or \fB*\fP, or an associative array name, the results differ as
-described below.
-If \fIlength\fP is omitted, expands to the substring of the value of
-\fIparameter\fP starting at the character specified by \fIoffset\fP
-and extending to the end of the value.
-\fIlength\fP and \fIoffset\fP are arithmetic expressions (see
-.SM
-.B
-ARITHMETIC EVALUATION
-below).
-.sp 1
-If \fIoffset\fP evaluates to a number less than zero, the value
-is used as an offset in characters
-from the end of the value of \fIparameter\fP.
-If \fIlength\fP evaluates to a number less than zero,
-it is interpreted as an offset in characters
-from the end of the value of \fIparameter\fP rather than
-a number of characters, and the expansion is the characters between
-\fIoffset\fP and that result.
-Note that a negative offset must be separated from the colon by at least
-one space to avoid being confused with the \fB:-\fP expansion.
-.sp 1
-If \fIparameter\fP is \fB@\fP, the result is \fIlength\fP positional
-parameters beginning at \fIoffset\fP.
-A negative \fIoffset\fP is taken relative to one greater than the greatest
-positional parameter, so an offset of -1 evaluates to the last positional
-parameter.
-It is an expansion error if \fIlength\fP evaluates to a number less than
-zero.
-.sp 1
-If \fIparameter\fP is an indexed array name subscripted by @ or *,
-the result is the \fIlength\fP
-members of the array beginning with ${\fIparameter\fP[\fIoffset\fP]}.
-A negative \fIoffset\fP is taken relative to one greater than the maximum
-index of the specified array.
-It is an expansion error if \fIlength\fP evaluates to a number less than
-zero.
-.sp 1
-Substring expansion applied to an associative array produces undefined
-results.
-.sp 1
-Substring indexing is zero-based unless the positional parameters
-are used, in which case the indexing starts at 1 by default.
-If \fIoffset\fP is 0, and the positional parameters are used, \fB$0\fP is
-prefixed to the list.
-.TP
-${\fB!\fP\fIprefix\fP\fB*\fP}
-.PD 0
-.TP
-${\fB!\fP\fIprefix\fP\fB@\fP}
-.PD
-\fBNames matching prefix\fP.
-Expands to the names of variables whose names begin with \fIprefix\fP,
-separated by the first character of the
-.SM
-.B IFS
-special variable.
-When \fI@\fP is used and the expansion appears within double quotes, each
-variable name expands to a separate word.
-.TP
-${\fB!\fP\fIname\fP[\fI@\fP]}
-.PD 0
-.TP
-${\fB!\fP\fIname\fP[\fI*\fP]}
-.PD
-\fBList of array keys\fP.
-If \fIname\fP is an array variable, expands to the list of array indices
-(keys) assigned in \fIname\fP.
-If \fIname\fP is not an array, expands to 0 if \fIname\fP is set and null
-otherwise.
-When \fI@\fP is used and the expansion appears within double quotes, each
-key expands to a separate word.
-.TP
-${\fB#\fP\fIparameter\fP}
-\fBParameter length\fP.
-The length in characters of the value of \fIparameter\fP is substituted.
-If
-.I parameter
-is
-.B *
-or
-.BR @ ,
-the value substituted is the number of positional parameters.
-If
-.I parameter
-is an array name subscripted by
-.B *
-or
-.BR @ ,
-the value substituted is the number of elements in the array.
-If
-.I parameter
-is an indexed array name subscripted by a negative number, that number is
-interpreted as relative to one greater than the maximum index of
-\fIparameter\fP, so negative indices count back from the end of the
-array, and an index of \-1 references the last element.
-.TP
-${\fIparameter\fP\fB#\fP\fIword\fP}
-.PD 0
-.TP
-${\fIparameter\fP\fB##\fP\fIword\fP}
-.PD
-\fBRemove matching prefix pattern\fP.
-The
-.I word
-is expanded to produce a pattern just as in pathname
-expansion. If the pattern matches the beginning of
-the value of
-.IR parameter ,
-then the result of the expansion is the expanded value of
-.I parameter
-with the shortest matching pattern (the ``\fB#\fP'' case) or the
-longest matching pattern (the ``\fB##\fP'' case) deleted.
-If
-.I parameter
-is
-.B @
-or
-.BR * ,
-the pattern removal operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If
-.I parameter
-is an array variable subscripted with
-.B @
-or
-.BR * ,
-the pattern removal operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-.TP
-${\fIparameter\fP\fB%\fP\fIword\fP}
-.PD 0
-.TP
-${\fIparameter\fP\fB%%\fP\fIword\fP}
-.PD
-\fBRemove matching suffix pattern\fP.
-The \fIword\fP is expanded to produce a pattern just as in
-pathname expansion.
-If the pattern matches a trailing portion of the expanded value of
-.IR parameter ,
-then the result of the expansion is the expanded value of
-.I parameter
-with the shortest matching pattern (the ``\fB%\fP'' case) or the
-longest matching pattern (the ``\fB%%\fP'' case) deleted.
-If
-.I parameter
-is
-.B @
-or
-.BR * ,
-the pattern removal operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If
-.I parameter
-is an array variable subscripted with
-.B @
-or
-.BR * ,
-the pattern removal operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-.TP
-${\fIparameter\fP\fB/\fP\fIpattern\fP\fB/\fP\fIstring\fP}
-\fBPattern substitution\fP.
-The \fIpattern\fP is expanded to produce a pattern just as in
-pathname expansion.
-\fIParameter\fP is expanded and the longest match of \fIpattern\fP
-against its value is replaced with \fIstring\fP.
-If \fIpattern\fP begins with \fB/\fP, all matches of \fIpattern\fP are
-replaced with \fIstring\fP. Normally only the first match is replaced.
-If \fIpattern\fP begins with \fB#\fP, it must match at the beginning
-of the expanded value of \fIparameter\fP.
-If \fIpattern\fP begins with \fB%\fP, it must match at the end
-of the expanded value of \fIparameter\fP.
-If \fIstring\fP is null, matches of \fIpattern\fP are deleted
-and the \fB/\fP following \fIpattern\fP may be omitted.
-If
-.I parameter
-is
-.B @
-or
-.BR * ,
-the substitution operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If
-.I parameter
-is an array variable subscripted with
-.B @
-or
-.BR * ,
-the substitution operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-.TP
-${\fIparameter\fP\fB^\fP\fIpattern\fP}
-.PD 0
-.TP
-${\fIparameter\fP\fB^^\fP\fIpattern\fP}
-.TP
-${\fIparameter\fP\fB,\fP\fIpattern\fP}
-.TP
-${\fIparameter\fP\fB,,\fP\fIpattern\fP}
-.PD
-\fBCase modification\fP.
-This expansion modifies the case of alphabetic characters in \fIparameter\fP.
-The \fIpattern\fP is expanded to produce a pattern just as in
-pathname expansion.
-Each character in the expanded value of \fIparameter\fP is tested against
-\fIpattern\fP, and, if it matches the pattern, its case is converted.
-The pattern should not attempt to match more than one character.
-The \fB^\fP operator converts lowercase letters matching \fIpattern\fP
-to uppercase; the \fB,\fP operator converts matching uppercase letters
-to lowercase.
-The \fB^^\fP and \fB,,\fP expansions convert each matched character in the
-expanded value; the \fB^\fP and \fB,\fP expansions match and convert only
-the first character in the expanded value.
-If \fIpattern\fP is omitted, it is treated like a \fB?\fP, which matches
-every character.
-If
-.I parameter
-is
-.B @
-or
-.BR * ,
-the case modification operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If
-.I parameter
-is an array variable subscripted with
-.B @
-or
-.BR * ,
-the case modification operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-.SS Command Substitution
-.PP
-\fICommand substitution\fP allows the output of a command to replace
-the command name. There are two forms:
-.RS
-.PP
-\fB$(\fP\fIcommand\fP\|\fB)\fP
-.RE
-or
-.RS
-\fB\`\fP\fIcommand\fP\fB\`\fP
-.RE
-.PP
-.B Bash
-performs the expansion by executing \fIcommand\fP and
-replacing the command substitution with the standard output of the
-command, with any trailing newlines deleted.
-Embedded newlines are not deleted, but they may be removed during
-word splitting.
-The command substitution \fB$(cat \fIfile\fP)\fR can be replaced by
-the equivalent but faster \fB$(< \fIfile\fP)\fR.
-.PP
-When the old-style backquote form of substitution is used,
-backslash retains its literal meaning except when followed by
-.BR $ ,
-.BR \` ,
-or
-.BR \e .
-The first backquote not preceded by a backslash terminates the
-command substitution.
-When using the $(\^\fIcommand\fP\|) form, all characters between the
-parentheses make up the command; none are treated specially.
-.PP
-Command substitutions may be nested. To nest when using the backquoted form,
-escape the inner backquotes with backslashes.
-.PP
-If the substitution appears within double quotes, word splitting and
-pathname expansion are not performed on the results.
-.SS Arithmetic Expansion
-.PP
-Arithmetic expansion allows the evaluation of an arithmetic expression
-and the substitution of the result. The format for arithmetic expansion is:
-.RS
-.PP
-\fB$((\fP\fIexpression\fP\fB))\fP
-.RE
-.PP
-The
-.I expression
-is treated as if it were within double quotes, but a double quote
-inside the parentheses is not treated specially.
-All tokens in the expression undergo parameter and variable expansion,
-command substitution, and quote removal.
-The result is treated as the arithmetic expression to be evaluated.
-Arithmetic expansions may be nested.
-.PP
-The evaluation is performed according to the rules listed below under
-.SM
-.BR "ARITHMETIC EVALUATION" .
-If
-.I expression
-is invalid,
-.B bash
-prints a message indicating failure and no substitution occurs.
-.SS Process Substitution
-.PP
-\fIProcess substitution\fP is supported on systems that support named
-pipes (\fIFIFOs\fP) or the \fB/dev/fd\fP method of naming open files.
-It takes the form of
-\fB<(\fP\fIlist\^\fP\fB)\fP
-or
-\fB>(\fP\fIlist\^\fP\fB)\fP.
-The process \fIlist\fP is run with its input or output connected to a
-\fIFIFO\fP or some file in \fB/dev/fd\fP. The name of this file is
-passed as an argument to the current command as the result of the
-expansion. If the \fB>(\fP\fIlist\^\fP\fB)\fP form is used, writing to
-the file will provide input for \fIlist\fP. If the
-\fB<(\fP\fIlist\^\fP\fB)\fP form is used, the file passed as an
-argument should be read to obtain the output of \fIlist\fP.
-.PP
-When available, process substitution is performed
-simultaneously with parameter and variable expansion,
-command substitution,
-and arithmetic expansion.
-.SS Word Splitting
-.PP
-The shell scans the results of
-parameter expansion,
-command substitution,
-and
-arithmetic expansion
-that did not occur within double quotes for
-.IR "word splitting" .
-.PP
-The shell treats each character of
-.SM
-.B IFS
-as a delimiter, and splits the results of the other
-expansions into words using these characters as field terminators.
-If
-.SM
-.B IFS
-is unset, or its
-value is exactly
-.BR <space><tab><newline> ,
-the default, then
-sequences of
-.BR <space> ,
-.BR <tab> ,
-and
-.B <newline>
-at the beginning and end of the results of the previous
-expansions are ignored, and
-any sequence of
-.SM
-.B IFS
-characters not at the beginning or end serves to delimit words.
-If
-.SM
-.B IFS
-has a value other than the default, then sequences of
-the whitespace characters
-.B space
-and
-.B tab
-are ignored at the beginning and end of the
-word, as long as the whitespace character is in the
-value of
-.SM
-.BR IFS
-(an
-.SM
-.B IFS
-whitespace character).
-Any character in
-.SM
-.B IFS
-that is not
-.SM
-.B IFS
-whitespace, along with any adjacent
-.SM
-.B IFS
-whitespace characters, delimits a field.
-A sequence of
-.SM
-.B IFS
-whitespace characters is also treated as a delimiter.
-If the value of
-.SM
-.B IFS
-is null, no word splitting occurs.
-.PP
-Explicit null arguments (\^\f3"\^"\fP or \^\f3\(aq\^\(aq\fP\^) are retained.
-Unquoted implicit null arguments, resulting from the expansion of
-parameters that have no values, are removed.
-If a parameter with no value is expanded within double quotes, a
-null argument results and is retained.
-.PP
-Note that if no expansion occurs, no splitting
-is performed.
-.SS Pathname Expansion
-.PP
-After word splitting,
-unless the
-.B \-f
-option has been set,
-.B bash
-scans each word for the characters
-.BR * ,
-.BR ? ,
-and
-.BR [ .
-If one of these characters appears, then the word is
-regarded as a
-.IR pattern ,
-and replaced with an alphabetically sorted list of
-filenames matching the pattern
-(see
-.SM
-.B "Pattern Matching"
-below).
-If no matching filenames are found,
-and the shell option
-.B nullglob
-is not enabled, the word is left unchanged.
-If the
-.B nullglob
-option is set, and no matches are found,
-the word is removed.
-If the
-.B failglob
-shell option is set, and no matches are found, an error message
-is printed and the command is not executed.
-If the shell option
-.B nocaseglob
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-When a pattern is used for pathname expansion,
-the character
-.B ``.''
-at the start of a name or immediately following a slash
-must be matched explicitly, unless the shell option
-.B dotglob
-is set.
-When matching a pathname, the slash character must always be
-matched explicitly.
-In other cases, the
-.B ``.''
-character is not treated specially.
-See the description of
-.B shopt
-below under
-.SM
-.B SHELL BUILTIN COMMANDS
-for a description of the
-.BR nocaseglob ,
-.BR nullglob ,
-.BR failglob ,
-and
-.B dotglob
-shell options.
-.PP
-The
-.SM
-.B GLOBIGNORE
-shell variable may be used to restrict the set of filenames matching a
-.IR pattern .
-If
-.SM
-.B GLOBIGNORE
-is set, each matching filename that also matches one of the patterns in
-.SM
-.B GLOBIGNORE
-is removed from the list of matches.
-The filenames
-.B ``.''
-and
-.B ``..''
-are always ignored when
-.SM
-.B GLOBIGNORE
-is set and not null. However, setting
-.SM
-.B GLOBIGNORE
-to a non-null value has the effect of enabling the
-.B dotglob
-shell option, so all other filenames beginning with a
-.B ``.''
-will match.
-To get the old behavior of ignoring filenames beginning with a
-.BR ``.'' ,
-make
-.B ``.*''
-one of the patterns in
-.SM
-.BR GLOBIGNORE .
-The
-.B dotglob
-option is disabled when
-.SM
-.B GLOBIGNORE
-is unset.
-.PP
-\fBPattern Matching\fP
-.PP
-Any character that appears in a pattern, other than the special pattern
-characters described below, matches itself. The NUL character may not
-occur in a pattern. A backslash escapes the following character; the
-escaping backslash is discarded when matching.
-The special pattern characters must be quoted if
-they are to be matched literally.
-.PP
-The special pattern characters have the following meanings:
-.PP
-.PD 0
-.RS
-.TP
-.B *
-Matches any string, including the null string.
-When the \fBglobstar\fP shell option is enabled, and \fB*\fP is used in
-a pathname expansion context, two adjacent \fB*\fPs used as a single
-pattern will match all files and zero or more directories and
-subdirectories.
-If followed by a \fB/\fP, two adjacent \fB*\fPs will match only directories
-and subdirectories.
-.TP
-.B ?
-Matches any single character.
-.TP
-.B [...]
-Matches any one of the enclosed characters. A pair of characters
-separated by a hyphen denotes a
-\fIrange expression\fP;
-any character that falls between those two characters, inclusive,
-using the current locale's collating sequence and character set,
-is matched. If the first character following the
-.B [
-is a
-.B !
-or a
-.B ^
-then any character not enclosed is matched.
-The sorting order of characters in range expressions is determined by
-the current locale and the values of the
-.SM
-.B LC_COLLATE
-or
-.SM
-.B LC_ALL
-shell variables, if set.
-To obtain the traditional interpretation of range expressions, where
-.B [a\-d]
-is equivalent to
-.BR [abcd] ,
-set value of the
-.B LC_ALL
-shell variable to
-.BR C ,
-or enable the
-.B globasciiranges
-shell option.
-A
-.B \-
-may be matched by including it as the first or last character
-in the set.
-A
-.B ]
-may be matched by including it as the first character
-in the set.
-.br
-.if t .sp 0.5
-.if n .sp 1
-Within
-.B [
-and
-.BR ] ,
-\fIcharacter classes\fP can be specified using the syntax
-\fB[:\fP\fIclass\fP\fB:]\fP, where \fIclass\fP is one of the
-following classes defined in the POSIX standard:
-.PP
-.RS
-.B
-.if n alnum alpha ascii blank cntrl digit graph lower print punct space upper word xdigit
-.if t alnum alpha ascii blank cntrl digit graph lower print punct space upper word xdigit
-.br
-A character class matches any character belonging to that class.
-The \fBword\fP character class matches letters, digits, and the character _.
-.br
-.if t .sp 0.5
-.if n .sp 1
-Within
-.B [
-and
-.BR ] ,
-an \fIequivalence class\fP can be specified using the syntax
-\fB[=\fP\fIc\fP\fB=]\fP, which matches all characters with the
-same collation weight (as defined by the current locale) as
-the character \fIc\fP.
-.br
-.if t .sp 0.5
-.if n .sp 1
-Within
-.B [
-and
-.BR ] ,
-the syntax \fB[.\fP\fIsymbol\fP\fB.]\fP matches the collating symbol
-\fIsymbol\fP.
-.RE
-.RE
-.PD
-.PP
-If the \fBextglob\fP shell option is enabled using the \fBshopt\fP
-builtin, several extended pattern matching operators are recognized.
-In the following description, a \fIpattern-list\fP is a list of one
-or more patterns separated by a \fB|\fP.
-Composite patterns may be formed using one or more of the following
-sub-patterns:
-.sp 1
-.PD 0
-.RS
-.TP
-\fB?(\fP\^\fIpattern-list\^\fP\fB)\fP
-Matches zero or one occurrence of the given patterns
-.TP
-\fB*(\fP\^\fIpattern-list\^\fP\fB)\fP
-Matches zero or more occurrences of the given patterns
-.TP
-\fB+(\fP\^\fIpattern-list\^\fP\fB)\fP
-Matches one or more occurrences of the given patterns
-.TP
-\fB@(\fP\^\fIpattern-list\^\fP\fB)\fP
-Matches one of the given patterns
-.TP
-\fB!(\fP\^\fIpattern-list\^\fP\fB)\fP
-Matches anything except one of the given patterns
-.RE
-.PD
-.SS Quote Removal
-.PP
-After the preceding expansions, all unquoted occurrences of the
-characters
-.BR \e ,
-.BR \(aq ,
-and \^\f3"\fP\^ that did not result from one of the above
-expansions are removed.
-.SH REDIRECTION
-Before a command is executed, its input and output
-may be
-.I redirected
-using a special notation interpreted by the shell.
-Redirection allows commands' file handles to be
-duplicated, opened, closed,
-made to refer to different files,
-and can change the files the command reads from and writes to.
-Redirection may also be used to modify file handles in the
-current shell execution environment.
-The following redirection
-operators may precede or appear anywhere within a
-.I simple command
-or may follow a
-.IR command .
-Redirections are processed in the order they appear, from
-left to right.
-.PP
-Each redirection that may be preceded by a file descriptor number
-may instead be preceded by a word of the form {\fIvarname\fP}.
-In this case, for each redirection operator except
->&- and <&-, the shell will allocate a file descriptor greater
-than or equal to 10 and assign it to \fIvarname\fP.
-If >&- or <&- is preceded
-by {\fIvarname\fP}, the value of \fIvarname\fP defines the file
-descriptor to close.
-.PP
-In the following descriptions, if the file descriptor number is
-omitted, and the first character of the redirection operator is
-.BR < ,
-the redirection refers to the standard input (file descriptor
-0). If the first character of the redirection operator is
-.BR > ,
-the redirection refers to the standard output (file descriptor
-1).
-.PP
-The word following the redirection operator in the following
-descriptions, unless otherwise noted, is subjected to
-brace expansion, tilde expansion, parameter and variable expansion,
-command substitution, arithmetic expansion, quote removal,
-pathname expansion, and word splitting.
-If it expands to more than one word,
-.B bash
-reports an error.
-.PP
-Note that the order of redirections is significant. For example,
-the command
-.RS
-.PP
-ls \fB>\fP dirlist 2\fB>&\fP1
-.RE
-.PP
-directs both standard output and standard error to the file
-.IR dirlist ,
-while the command
-.RS
-.PP
-ls 2\fB>&\fP1 \fB>\fP dirlist
-.RE
-.PP
-directs only the standard output to file
-.IR dirlist ,
-because the standard error was duplicated from the standard output
-before the standard output was redirected to
-.IR dirlist .
-.PP
-\fBBash\fP handles several filenames specially when they are used in
-redirections, as described in the following table:
-.RS
-.PP
-.PD 0
-.TP
-.B /dev/fd/\fIfd\fP
-If \fIfd\fP is a valid integer, file descriptor \fIfd\fP is duplicated.
-.TP
-.B /dev/stdin
-File descriptor 0 is duplicated.
-.TP
-.B /dev/stdout
-File descriptor 1 is duplicated.
-.TP
-.B /dev/stderr
-File descriptor 2 is duplicated.
-.TP
-.B /dev/tcp/\fIhost\fP/\fIport\fP
-If \fIhost\fP is a valid hostname or Internet address, and \fIport\fP
-is an integer port number or service name, \fBbash\fP attempts to open
-the corresponding TCP socket.
-.TP
-.B /dev/udp/\fIhost\fP/\fIport\fP
-If \fIhost\fP is a valid hostname or Internet address, and \fIport\fP
-is an integer port number or service name, \fBbash\fP attempts to open
-the corresponding UDP socket.
-.PD
-.RE
-.PP
-A failure to open or create a file causes the redirection to fail.
-.PP
-Redirections using file descriptors greater than 9 should be used with
-care, as they may conflict with file descriptors the shell uses
-internally.
-.SS Redirecting Input
-.PP
-Redirection of input causes the file whose name results from
-the expansion of
-.I word
-to be opened for reading on file descriptor
-.IR n ,
-or the standard input (file descriptor 0) if
-.I n
-is not specified.
-.PP
-The general format for redirecting input is:
-.RS
-.PP
-[\fIn\fP]\fB<\fP\fIword\fP
-.RE
-.SS Redirecting Output
-.PP
-Redirection of output causes the file whose name results from
-the expansion of
-.I word
-to be opened for writing on file descriptor
-.IR n ,
-or the standard output (file descriptor 1) if
-.I n
-is not specified. If the file does not exist it is created;
-if it does exist it is truncated to zero size.
-.PP
-The general format for redirecting output is:
-.RS
-.PP
-[\fIn\fP]\fB>\fP\fIword\fP
-.RE
-.PP
-If the redirection operator is
-.BR > ,
-and the
-.B noclobber
-option to the
-.B set
-builtin has been enabled, the redirection will fail if the file
-whose name results from the expansion of \fIword\fP exists and is
-a regular file.
-If the redirection operator is
-.BR >| ,
-or the redirection operator is
-.B >
-and the
-.B noclobber
-option to the
-.B set
-builtin command is not enabled, the redirection is attempted even
-if the file named by \fIword\fP exists.
-.SS Appending Redirected Output
-.PP
-Redirection of output in this fashion
-causes the file whose name results from
-the expansion of
-.I word
-to be opened for appending on file descriptor
-.IR n ,
-or the standard output (file descriptor 1) if
-.I n
-is not specified. If the file does not exist it is created.
-.PP
-The general format for appending output is:
-.RS
-.PP
-[\fIn\fP]\fB>>\fP\fIword\fP
-.RE
-.PP
-.SS Redirecting Standard Output and Standard Error
-.PP
-This construct allows both the
-standard output (file descriptor 1) and
-the standard error output (file descriptor 2)
-to be redirected to the file whose name is the
-expansion of
-.IR word .
-.PP
-There are two formats for redirecting standard output and
-standard error:
-.RS
-.PP
-\fB&>\fP\fIword\fP
-.RE
-and
-.RS
-\fB>&\fP\fIword\fP
-.RE
-.PP
-Of the two forms, the first is preferred.
-This is semantically equivalent to
-.RS
-.PP
-\fB>\fP\fIword\fP 2\fB>&\fP1
-.RE
-.PP
-When using the second form, \fIword\fP may not expand to a number or
-\fB\-\fP. If it does, other redirection operators apply
-(see \fBDuplicating File Descriptors\fP below) for compatibility
-reasons.
-.SS Appending Standard Output and Standard Error
-.PP
-This construct allows both the
-standard output (file descriptor 1) and
-the standard error output (file descriptor 2)
-to be appended to the file whose name is the
-expansion of
-.IR word .
-.PP
-The format for appending standard output and standard error is:
-.RS
-.PP
-\fB&>>\fP\fIword\fP
-.RE
-.PP
-This is semantically equivalent to
-.RS
-.PP
-\fB>>\fP\fIword\fP 2\fB>&\fP1
-.RE
-.PP
-(see \fBDuplicating File Descriptors\fP below).
-.SS Here Documents
-.PP
-This type of redirection instructs the shell to read input from the
-current source until a line containing only
-.I delimiter
-(with no trailing blanks)
-is seen. All of
-the lines read up to that point are then used as the standard
-input for a command.
-.PP
-The format of here-documents is:
-.RS
-.PP
-.nf
-\fB<<\fP[\fB\-\fP]\fIword\fP
- \fIhere-document\fP
-\fIdelimiter\fP
-.fi
-.RE
-.PP
-No parameter and variable expansion, command substitution,
-arithmetic expansion, or pathname expansion is performed on
-.IR word .
-If any characters in
-.I word
-are quoted, the
-.I delimiter
-is the result of quote removal on
-.IR word ,
-and the lines in the here-document are not expanded.
-If \fIword\fP is unquoted,
-all lines of the here-document are subjected to
-parameter expansion, command substitution, and arithmetic expansion,
-the character sequence
-.B \e<newline>
-is ignored, and
-.B \e
-must be used to quote the characters
-.BR \e ,
-.BR $ ,
-and
-.BR \` .
-.PP
-If the redirection operator is
-.BR <<\- ,
-then all leading tab characters are stripped from input lines and the
-line containing
-.IR delimiter .
-This allows
-here-documents within shell scripts to be indented in a
-natural fashion.
-.SS "Here Strings"
-A variant of here documents, the format is:
-.RS
-.PP
-.nf
-\fB<<<\fP\fIword\fP
-.fi
-.RE
-.PP
-The \fIword\fP undergoes
-brace expansion, tilde expansion, parameter and variable expansion,
-command substitution, arithmetic expansion, and quote removal.
-Pathname expansion and word splitting are not performed.
-The result is supplied as a single string to the command on its
-standard input.
-.SS "Duplicating File Descriptors"
-.PP
-The redirection operator
-.RS
-.PP
-[\fIn\fP]\fB<&\fP\fIword\fP
-.RE
-.PP
-is used to duplicate input file descriptors.
-If
-.I word
-expands to one or more digits, the file descriptor denoted by
-.I n
-is made to be a copy of that file descriptor.
-If the digits in
-.I word
-do not specify a file descriptor open for input, a redirection error occurs.
-If
-.I word
-evaluates to
-.BR \- ,
-file descriptor
-.I n
-is closed. If
-.I n
-is not specified, the standard input (file descriptor 0) is used.
-.PP
-The operator
-.RS
-.PP
-[\fIn\fP]\fB>&\fP\fIword\fP
-.RE
-.PP
-is used similarly to duplicate output file descriptors. If
-.I n
-is not specified, the standard output (file descriptor 1) is used.
-If the digits in
-.I word
-do not specify a file descriptor open for output, a redirection error occurs.
-If
-.I word
-evaluates to
-.BR \- ,
-file descriptor
-.I n
-is closed.
-As a special case, if \fIn\fP is omitted, and \fIword\fP does not
-expand to one or more digits or \fB\-\fP, the standard output and standard
-error are redirected as described previously.
-.SS "Moving File Descriptors"
-.PP
-The redirection operator
-.RS
-.PP
-[\fIn\fP]\fB<&\fP\fIdigit\fP\fB\-\fP
-.RE
-.PP
-moves the file descriptor \fIdigit\fP to file descriptor
-.IR n ,
-or the standard input (file descriptor 0) if \fIn\fP is not specified.
-\fIdigit\fP is closed after being duplicated to \fIn\fP.
-.PP
-Similarly, the redirection operator
-.RS
-.PP
-[\fIn\fP]\fB>&\fP\fIdigit\fP\fB\-\fP
-.RE
-.PP
-moves the file descriptor \fIdigit\fP to file descriptor
-.IR n ,
-or the standard output (file descriptor 1) if \fIn\fP is not specified.
-.SS "Opening File Descriptors for Reading and Writing"
-.PP
-The redirection operator
-.RS
-.PP
-[\fIn\fP]\fB<>\fP\fIword\fP
-.RE
-.PP
-causes the file whose name is the expansion of
-.I word
-to be opened for both reading and writing on file descriptor
-.IR n ,
-or on file descriptor 0 if
-.I n
-is not specified. If the file does not exist, it is created.
-.SH ALIASES
-\fIAliases\fP allow a string to be substituted for a word when it is used
-as the first word of a simple command.
-The shell maintains a list of aliases that may be set and unset with the
-.B alias
-and
-.B unalias
-builtin commands (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-The first word of each simple command, if unquoted,
-is checked to see if it has an
-alias. If so, that word is replaced by the text of the alias.
-The characters \fB/\fP, \fB$\fP, \fB\`\fP, and \fB=\fP and
-any of the shell \fImetacharacters\fP or quoting characters
-listed above may not appear in an alias name.
-The replacement text may contain any valid shell input,
-including shell metacharacters.
-The first word of the replacement text is tested
-for aliases, but a word that is identical to an alias being expanded
-is not expanded a second time.
-This means that one may alias
-.B ls
-to
-.BR "ls \-F" ,
-for instance, and
-.B bash
-does not try to recursively expand the replacement text.
-If the last character of the alias value is a
-.IR blank ,
-then the next command
-word following the alias is also checked for alias expansion.
-.PP
-Aliases are created and listed with the
-.B alias
-command, and removed with the
-.B unalias
-command.
-.PP
-There is no mechanism for using arguments in the replacement text.
-If arguments are needed, a shell function should be used (see
-.SM
-.B FUNCTIONS
-below).
-.PP
-Aliases are not expanded when the shell is not interactive, unless
-the
-.B expand_aliases
-shell option is set using
-.B shopt
-(see the description of
-.B shopt
-under
-.SM
-\fBSHELL BUILTIN COMMANDS\fP
-below).
-.PP
-The rules concerning the definition and use of aliases are
-somewhat confusing.
-.B Bash
-always reads at least one complete line
-of input before executing any
-of the commands on that line. Aliases are expanded when a
-command is read, not when it is executed. Therefore, an
-alias definition appearing on the same line as another
-command does not take effect until the next line of input is read.
-The commands following the alias definition
-on that line are not affected by the new alias.
-This behavior is also an issue when functions are executed.
-Aliases are expanded when a function definition is read,
-not when the function is executed, because a function definition
-is itself a command. As a consequence, aliases
-defined in a function are not available until after that
-function is executed. To be safe, always put
-alias definitions on a separate line, and do not use
-.B alias
-in compound commands.
-.PP
-For almost every purpose, aliases are superseded by
-shell functions.
-.SH FUNCTIONS
-A shell function, defined as described above under
-.SM
-.BR "SHELL GRAMMAR" ,
-stores a series of commands for later execution.
-When the name of a shell function is used as a simple command name,
-the list of commands associated with that function name is executed.
-Functions are executed in the context of the
-current shell; no new process is created to interpret
-them (contrast this with the execution of a shell script).
-When a function is executed, the arguments to the
-function become the positional parameters
-during its execution.
-The special parameter
-.B #
-is updated to reflect the change. Special parameter \fB0\fP
-is unchanged.
-The first element of the
-.SM
-.B FUNCNAME
-variable is set to the name of the function while the function
-is executing.
-.PP
-All other aspects of the shell execution
-environment are identical between a function and its caller
-with these exceptions: the
-.SM
-.B DEBUG
-and
-.B RETURN
-traps (see the description of the
-.B trap
-builtin under
-.SM
-.B SHELL BUILTIN COMMANDS
-below) are not inherited unless the function has been given the
-\fBtrace\fP attribute (see the description of the
-.SM
-.B declare
-builtin below) or the
-\fB\-o functrace\fP shell option has been enabled with
-the \fBset\fP builtin
-(in which case all functions inherit the \fBDEBUG\fP and \fBRETURN\fP traps),
-and the
-.SM
-.B ERR
-trap is not inherited unless the \fB\-o errtrace\fP shell option has
-been enabled.
-.PP
-Variables local to the function may be declared with the
-.B local
-builtin command. Ordinarily, variables and their values
-are shared between the function and its caller.
-.PP
-The \fBFUNCNEST\fP variable, if set to a numeric value greater
-than 0, defines a maximum function nesting level. Function
-invocations that exceed the limit cause the entire command to
-abort.
-.PP
-If the builtin command
-.B return
-is executed in a function, the function completes and
-execution resumes with the next command after the function
-call.
-Any command associated with the \fBRETURN\fP trap is executed
-before execution resumes.
-When a function completes, the values of the
-positional parameters and the special parameter
-.B #
-are restored to the values they had prior to the function's
-execution.
-.PP
-Function names and definitions may be listed with the
-.B \-f
-option to the
-.B declare
-or
-.B typeset
-builtin commands. The
-.B \-F
-option to
-.B declare
-or
-.B typeset
-will list the function names only
-(and optionally the source file and line number, if the \fBextdebug\fP
-shell option is enabled).
-Functions may be exported so that subshells
-automatically have them defined with the
-.B \-f
-option to the
-.B export
-builtin.
-A function definition may be deleted using the \fB\-f\fP option to
-the
-.B unset
-builtin.
-Note that shell functions and variables with the same name may result
-in multiple identically-named entries in the environment passed to the
-shell's children.
-Care should be taken in cases where this may cause a problem.
-.PP
-Functions may be recursive.
-The \fBFUNCNEST\fP variable may be used to limit the depth of the
-function call stack and restrict the number of function invocations.
-By default, no limit is imposed on the number of recursive calls.
-.SH "ARITHMETIC EVALUATION"
-The shell allows arithmetic expressions to be evaluated, under
-certain circumstances (see the \fBlet\fP and \fBdeclare\fP builtin
-commands and \fBArithmetic Expansion\fP).
-Evaluation is done in fixed-width integers with no check for overflow,
-though division by 0 is trapped and flagged as an error.
-The operators and their precedence, associativity, and values
-are the same as in the C language.
-The following list of operators is grouped into levels of
-equal-precedence operators.
-The levels are listed in order of decreasing precedence.
-.PP
-.PD 0
-.TP
-.B \fIid\fP++ \fIid\fP\-\-
-variable post-increment and post-decrement
-.TP
-.B ++\fIid\fP \-\-\fIid\fP
-variable pre-increment and pre-decrement
-.TP
-.B \- +
-unary minus and plus
-.TP
-.B ! ~
-logical and bitwise negation
-.TP
-.B **
-exponentiation
-.TP
-.B * / %
-multiplication, division, remainder
-.TP
-.B + \-
-addition, subtraction
-.TP
-.B << >>
-left and right bitwise shifts
-.TP
-.B <= >= < >
-comparison
-.TP
-.B == !=
-equality and inequality
-.TP
-.B &
-bitwise AND
-.TP
-.B ^
-bitwise exclusive OR
-.TP
-.B |
-bitwise OR
-.TP
-.B &&
-logical AND
-.TP
-.B ||
-logical OR
-.TP
-.B \fIexpr\fP?\fIexpr\fP:\fIexpr\fP
-conditional operator
-.TP
-.B = *= /= %= += \-= <<= >>= &= ^= |=
-assignment
-.TP
-.B \fIexpr1\fP , \fIexpr2\fP
-comma
-.PD
-.PP
-Shell variables are allowed as operands; parameter expansion is
-performed before the expression is evaluated.
-Within an expression, shell variables may also be referenced by name
-without using the parameter expansion syntax.
-A shell variable that is null or unset evaluates to 0 when referenced
-by name without using the parameter expansion syntax.
-The value of a variable is evaluated as an arithmetic expression
-when it is referenced, or when a variable which has been given the
-\fIinteger\fP attribute using \fBdeclare -i\fP is assigned a value.
-A null value evaluates to 0.
-A shell variable need not have its \fIinteger\fP attribute
-turned on to be used in an expression.
-.PP
-Constants with a leading 0 are interpreted as octal numbers.
-A leading 0x or 0X denotes hexadecimal.
-Otherwise, numbers take the form [\fIbase#\fP]n, where the optional \fIbase\fP
-is a decimal number between 2 and 64 representing the arithmetic
-base, and \fIn\fP is a number in that base.
-If \fIbase#\fP is omitted, then base 10 is used.
-When specifying \fIn\fP,
-the digits greater< than 9 are represented by the lowercase letters,
-the uppercase letters, @, and _, in that order.
-If \fIbase\fP is less than or equal to 36, lowercase and uppercase
-letters may be used interchangeably to represent numbers between 10
-and 35.
-.PP
-Operators are evaluated in order of precedence. Sub-expressions in
-parentheses are evaluated first and may override the precedence
-rules above.
-.SH "CONDITIONAL EXPRESSIONS"
-Conditional expressions are used by the \fB[[\fP compound command and
-the \fBtest\fP and \fB[\fP builtin commands to test file attributes
-and perform string and arithmetic comparisons.
-Expressions are formed from the following unary or binary primaries.
-If any \fIfile\fP argument to one of the primaries is of the form
-\fI/dev/fd/n\fP, then file descriptor \fIn\fP is checked.
-If the \fIfile\fP argument to one of the primaries is one of
-\fI/dev/stdin\fP, \fI/dev/stdout\fP, or \fI/dev/stderr\fP, file
-descriptor 0, 1, or 2, respectively, is checked.
-.PP
-Unless otherwise specified, primaries that operate on files follow symbolic
-links and operate on the target of the link, rather than the link itself.
-.if t .sp 0.5
-.if n .sp 1
-When used with \fB[[\fP, the \fB<\fP and \fB>\fP operators sort
-lexicographically using the current locale.
-The \fBtest\fP command sorts using ASCII ordering.
-.sp 1
-.PD 0
-.TP
-.B \-a \fIfile\fP
-True if \fIfile\fP exists.
-.TP
-.B \-b \fIfile\fP
-True if \fIfile\fP exists and is a block special file.
-.TP
-.B \-c \fIfile\fP
-True if \fIfile\fP exists and is a character special file.
-.TP
-.B \-d \fIfile\fP
-True if \fIfile\fP exists and is a directory.
-.TP
-.B \-e \fIfile\fP
-True if \fIfile\fP exists.
-.TP
-.B \-f \fIfile\fP
-True if \fIfile\fP exists and is a regular file.
-.TP
-.B \-g \fIfile\fP
-True if \fIfile\fP exists and is set-group-id.
-.TP
-.B \-h \fIfile\fP
-True if \fIfile\fP exists and is a symbolic link.
-.TP
-.B \-k \fIfile\fP
-True if \fIfile\fP exists and its ``sticky'' bit is set.
-.TP
-.B \-p \fIfile\fP
-True if \fIfile\fP exists and is a named pipe (FIFO).
-.TP
-.B \-r \fIfile\fP
-True if \fIfile\fP exists and is readable.
-.TP
-.B \-s \fIfile\fP
-True if \fIfile\fP exists and has a size greater than zero.
-.TP
-.B \-t \fIfd\fP
-True if file descriptor
-.I fd
-is open and refers to a terminal.
-.TP
-.B \-u \fIfile\fP
-True if \fIfile\fP exists and its set-user-id bit is set.
-.TP
-.B \-w \fIfile\fP
-True if \fIfile\fP exists and is writable.
-.TP
-.B \-x \fIfile\fP
-True if \fIfile\fP exists and is executable.
-.TP
-.B \-G \fIfile\fP
-True if \fIfile\fP exists and is owned by the effective group id.
-.TP
-.B \-L \fIfile\fP
-True if \fIfile\fP exists and is a symbolic link.
-.TP
-.B \-N \fIfile\fP
-True if \fIfile\fP exists and has been modified since it was last read.
-.TP
-.B \-O \fIfile\fP
-True if \fIfile\fP exists and is owned by the effective user id.
-.TP
-.B \-S \fIfile\fP
-True if \fIfile\fP exists and is a socket.
-.TP
-\fIfile1\fP \fB\-ef\fP \fIfile2\fP
-True if \fIfile1\fP and \fIfile2\fP refer to the same device and
-inode numbers.
-.TP
-\fIfile1\fP \-\fBnt\fP \fIfile2\fP
-True if \fIfile1\fP is newer (according to modification date) than \fIfile2\fP,
-or if \fIfile1\fP exists and \fPfile2\fP does not.
-.TP
-\fIfile1\fP \-\fBot\fP \fIfile2\fP
-True if \fIfile1\fP is older than \fIfile2\fP, or if \fIfile2\fP exists
-and \fIfile1\fP does not.
-.TP
-.B \-o \fIoptname\fP
-True if the shell option
-.I optname
-is enabled.
-See the list of options under the description of the
-.B \-o
-option to the
-.B set
-builtin below.
-.TP
-.B \-v \fIvarname\fP
-True if the shell variable
-.I varname
-is set (has been assigned a value).
-.TP
-.B \-R \fIvarname\fP
-True if the shell variable
-.I varname
-is set and is a name reference.
-.TP
-.B \-z \fIstring\fP
-True if the length of \fIstring\fP is zero.
-.TP
-\fIstring\fP
-.PD 0
-.TP
-.B \-n \fIstring\fP
-.PD
-True if the length of
-.I string
-is non-zero.
-.TP
-\fIstring1\fP \fB==\fP \fIstring2\fP
-.PD 0
-.TP
-\fIstring1\fP \fB=\fP \fIstring2\fP
-.PD
-True if the strings are equal. \fB=\fP should be used
-with the \fBtest\fP command for POSIX conformance.
-When used with the \fB[[\fP command, this performs pattern matching as
-described above (\fBCompound Commands\fP).
-.TP
-\fIstring1\fP \fB!=\fP \fIstring2\fP
-True if the strings are not equal.
-.TP
-\fIstring1\fP \fB<\fP \fIstring2\fP
-True if \fIstring1\fP sorts before \fIstring2\fP lexicographically.
-.TP
-\fIstring1\fP \fB>\fP \fIstring2\fP
-True if \fIstring1\fP sorts after \fIstring2\fP lexicographically.
-.TP
-.I \fIarg1\fP \fBOP\fP \fIarg2\fP
-.SM
-.B OP
-is one of
-.BR \-eq ,
-.BR \-ne ,
-.BR \-lt ,
-.BR \-le ,
-.BR \-gt ,
-or
-.BR \-ge .
-These arithmetic binary operators return true if \fIarg1\fP
-is equal to, not equal to, less than, less than or equal to,
-greater than, or greater than or equal to \fIarg2\fP, respectively.
-.I Arg1
-and
-.I arg2
-may be positive or negative integers.
-.PD
-.SH "SIMPLE COMMAND EXPANSION"
-When a simple command is executed, the shell performs the following
-expansions, assignments, and redirections, from left to right.
-.IP 1.
-The words that the parser has marked as variable assignments (those
-preceding the command name) and redirections are saved for later
-processing.
-.IP 2.
-The words that are not variable assignments or redirections are
-expanded. If any words remain after expansion, the first word
-is taken to be the name of the command and the remaining words are
-the arguments.
-.IP 3.
-Redirections are performed as described above under
-.SM
-.BR REDIRECTION .
-.IP 4.
-The text after the \fB=\fP in each variable assignment undergoes tilde
-expansion, parameter expansion, command substitution, arithmetic expansion,
-and quote removal before being assigned to the variable.
-.PP
-If no command name results, the variable assignments affect the current
-shell environment. Otherwise, the variables are added to the environment
-of the executed command and do not affect the current shell environment.
-If any of the assignments attempts to assign a value to a readonly variable,
-an error occurs, and the command exits with a non-zero status.
-.PP
-If no command name results, redirections are performed, but do not
-affect the current shell environment. A redirection error causes the
-command to exit with a non-zero status.
-.PP
-If there is a command name left after expansion, execution proceeds as
-described below. Otherwise, the command exits. If one of the expansions
-contained a command substitution, the exit status of the command is
-the exit status of the last command substitution performed. If there
-were no command substitutions, the command exits with a status of zero.
-.SH "COMMAND EXECUTION"
-After a command has been split into words, if it results in a
-simple command and an optional list of arguments, the following
-actions are taken.
-.PP
-If the command name contains no slashes, the shell attempts to
-locate it. If there exists a shell function by that name, that
-function is invoked as described above in
-.SM
-.BR FUNCTIONS .
-If the name does not match a function, the shell searches for
-it in the list of shell builtins. If a match is found, that
-builtin is invoked.
-.PP
-If the name is neither a shell function nor a builtin,
-and contains no slashes,
-.B bash
-searches each element of the
-.SM
-.B PATH
-for a directory containing an executable file by that name.
-.B Bash
-uses a hash table to remember the full pathnames of executable
-files (see
-.B hash
-under
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below).
-A full search of the directories in
-.SM
-.B PATH
-is performed only if the command is not found in the hash table.
-If the search is unsuccessful, the shell searches for a defined shell
-function named \fBcommand_not_found_handle\fP.
-If that function exists, it is invoked with the original command and
-the original command's arguments as its arguments, and the function's
-exit status becomes the exit status of the shell.
-If that function is not defined, the shell prints an error
-message and returns an exit status of 127.
-.PP
-If the search is successful, or if the command name contains
-one or more slashes, the shell executes the named program in a
-separate execution environment.
-Argument 0 is set to the name given, and the remaining arguments
-to the command are set to the arguments given, if any.
-.PP
-If this execution fails because the file is not in executable
-format, and the file is not a directory, it is assumed to be
-a \fIshell script\fP, a file
-containing shell commands. A subshell is spawned to execute
-it. This subshell reinitializes itself, so
-that the effect is as if a new shell had been invoked
-to handle the script, with the exception that the locations of
-commands remembered by the parent (see
-.B hash
-below under
-.SM
-\fBSHELL BUILTIN COMMANDS\fP)
-are retained by the child.
-.PP
-If the program is a file beginning with
-.BR #! ,
-the remainder of the first line specifies an interpreter
-for the program. The shell executes the
-specified interpreter on operating systems that do not
-handle this executable format themselves. The arguments to the
-interpreter consist of a single optional argument following the
-interpreter name on the first line of the program, followed
-by the name of the program, followed by the command
-arguments, if any.
-.SH COMMAND EXECUTION ENVIRONMENT
-The shell has an \fIexecution environment\fP, which consists of the
-following:
-.IP \(bu
-open files inherited by the shell at invocation, as modified by
-redirections supplied to the \fBexec\fP builtin
-.IP \(bu
-the current working directory as set by \fBcd\fP, \fBpushd\fP, or
-\fBpopd\fP, or inherited by the shell at invocation
-.IP \(bu
-the file creation mode mask as set by \fBumask\fP or inherited from
-the shell's parent
-.IP \(bu
-current traps set by \fBtrap\fP
-.IP \(bu
-shell parameters that are set by variable assignment or with \fBset\fP
-or inherited from the shell's parent in the environment
-.IP \(bu
-shell functions defined during execution or inherited from the shell's
-parent in the environment
-.IP \(bu
-options enabled at invocation (either by default or with command-line
-arguments) or by \fBset\fP
-.IP \(bu
-options enabled by \fBshopt\fP
-.IP \(bu
-shell aliases defined with \fBalias\fP
-.IP \(bu
-various process IDs, including those of background jobs, the value
-of \fB$$\fP, and the value of
-.SM
-.B PPID
-.PP
-When a simple command other than a builtin or shell function
-is to be executed, it
-is invoked in a separate execution environment that consists of
-the following. Unless otherwise noted, the values are inherited
-from the shell.
-.if n .sp 1
-.IP \(bu
-the shell's open files, plus any modifications and additions specified
-by redirections to the command
-.IP \(bu
-the current working directory
-.IP \(bu
-the file creation mode mask
-.IP \(bu
-shell variables and functions marked for export, along with variables
-exported for the command, passed in the environment
-.IP \(bu
-traps caught by the shell are reset to the values inherited from the
-shell's parent, and traps ignored by the shell are ignored
-.PP
-A command invoked in this separate environment cannot affect the
-shell's execution environment.
-.PP
-Command substitution, commands grouped with parentheses,
-and asynchronous commands are invoked in a
-subshell environment that is a duplicate of the shell environment,
-except that traps caught by the shell are reset to the values
-that the shell inherited from its parent at invocation. Builtin
-commands that are invoked as part of a pipeline are also executed in a
-subshell environment. Changes made to the subshell environment
-cannot affect the shell's execution environment.
-.PP
-Subshells spawned to execute command substitutions inherit the value of
-the \fB\-e\fP option from the parent shell. When not in \fIposix\fP mode,
-\fBbash\fP clears the \fB\-e\fP option in such subshells.
-.PP
-If a command is followed by a \fB&\fP and job control is not active, the
-default standard input for the command is the empty file \fI/dev/null\fP.
-Otherwise, the invoked command inherits the file descriptors of the calling
-shell as modified by redirections.
-.SH ENVIRONMENT
-When a program is invoked it is given an array of strings
-called the
-.IR environment .
-This is a list of
-\fIname\fP\-\fIvalue\fP pairs, of the form
-.IR "name\fR=\fPvalue" .
-.PP
-The shell provides several ways to manipulate the environment.
-On invocation, the shell scans its own environment and
-creates a parameter for each name found, automatically marking
-it for
-.I export
-to child processes. Executed commands inherit the environment.
-The
-.B export
-and
-.B declare \-x
-commands allow parameters and functions to be added to and
-deleted from the environment. If the value of a parameter
-in the environment is modified, the new value becomes part
-of the environment, replacing the old. The environment
-inherited by any executed command consists of the shell's
-initial environment, whose values may be modified in the shell,
-less any pairs removed by the
-.B unset
-command, plus any additions via the
-.B export
-and
-.B declare \-x
-commands.
-.PP
-The environment for any
-.I simple command
-or function may be augmented temporarily by prefixing it with
-parameter assignments, as described above in
-.SM
-.BR PARAMETERS .
-These assignment statements affect only the environment seen
-by that command.
-.PP
-If the
-.B \-k
-option is set (see the
-.B set
-builtin command below), then
-.I all
-parameter assignments are placed in the environment for a command,
-not just those that precede the command name.
-.PP
-When
-.B bash
-invokes an external command, the variable
-.B _
-is set to the full filename of the command and passed to that
-command in its environment.
-.SH "EXIT STATUS"
-.PP
-The exit status of an executed command is the value returned by the
-\fIwaitpid\fP system call or equivalent function. Exit statuses
-fall between 0 and 255, though, as explained below, the shell may
-use values above 125 specially. Exit statuses from shell builtins and
-compound commands are also limited to this range. Under certain
-circumstances, the shell will use special values to indicate specific
-failure modes.
-.PP
-For the shell's purposes, a command which exits with a
-zero exit status has succeeded. An exit status of zero
-indicates success. A non-zero exit status indicates failure.
-When a command terminates on a fatal signal \fIN\fP, \fBbash\fP uses
-the value of 128+\fIN\fP as the exit status.
-.PP
-If a command is not found, the child process created to
-execute it returns a status of 127. If a command is found
-but is not executable, the return status is 126.
-.PP
-If a command fails because of an error during expansion or redirection,
-the exit status is greater than zero.
-.PP
-Shell builtin commands return a status of 0 (\fItrue\fP) if
-successful, and non-zero (\fIfalse\fP) if an error occurs
-while they execute.
-All builtins return an exit status of 2 to indicate incorrect usage,
-generally invalid options or missing arguments.
-.PP
-\fBBash\fP itself returns the exit status of the last command
-executed, unless a syntax error occurs, in which case it exits
-with a non-zero value. See also the \fBexit\fP builtin
-command below.
-.SH SIGNALS
-When \fBbash\fP is interactive, in the absence of any traps, it ignores
-.SM
-.B SIGTERM
-(so that \fBkill 0\fP does not kill an interactive shell),
-and
-.SM
-.B SIGINT
-is caught and handled (so that the \fBwait\fP builtin is interruptible).
-In all cases, \fBbash\fP ignores
-.SM
-.BR SIGQUIT .
-If job control is in effect,
-.B bash
-ignores
-.SM
-.BR SIGTTIN ,
-.SM
-.BR SIGTTOU ,
-and
-.SM
-.BR SIGTSTP .
-.PP
-Non-builtin commands run by \fBbash\fP have signal handlers
-set to the values inherited by the shell from its parent.
-When job control is not in effect, asynchronous commands
-ignore
-.SM
-.B SIGINT
-and
-.SM
-.B SIGQUIT
-in addition to these inherited handlers.
-Commands run as a result of command substitution ignore the
-keyboard-generated job control signals
-.SM
-.BR SIGTTIN ,
-.SM
-.BR SIGTTOU ,
-and
-.SM
-.BR SIGTSTP .
-.PP
-The shell exits by default upon receipt of a
-.SM
-.BR SIGHUP .
-Before exiting, an interactive shell resends the
-.SM
-.B SIGHUP
-to all jobs, running or stopped.
-Stopped jobs are sent
-.SM
-.B SIGCONT
-to ensure that they receive the
-.SM
-.BR SIGHUP .
-To prevent the shell from
-sending the signal to a particular job, it should be removed from the
-jobs table with the
-.B disown
-builtin (see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below) or marked
-to not receive
-.SM
-.B SIGHUP
-using
-.BR "disown \-h" .
-.PP
-If the
-.B huponexit
-shell option has been set with
-.BR shopt ,
-.B bash
-sends a
-.SM
-.B SIGHUP
-to all jobs when an interactive login shell exits.
-.PP
-If \fBbash\fP is waiting for a command to complete and receives a signal
-for which a trap has been set, the trap will not be executed until
-the command completes.
-When \fBbash\fP is waiting for an asynchronous command via the \fBwait\fP
-builtin, the reception of a signal for which a trap has been set will
-cause the \fBwait\fP builtin to return immediately with an exit status
-greater than 128, immediately after which the trap is executed.
-.SH "JOB CONTROL"
-.I Job control
-refers to the ability to selectively stop (\fIsuspend\fP)
-the execution of processes and continue (\fIresume\fP)
-their execution at a later point. A user typically employs
-this facility via an interactive interface supplied jointly
-by the operating system kernel's terminal driver and
-.BR bash .
-.PP
-The shell associates a
-.I job
-with each pipeline. It keeps a table of currently executing
-jobs, which may be listed with the
-.B jobs
-command. When
-.B bash
-starts a job asynchronously (in the
-.IR background ),
-it prints a line that looks like:
-.RS
-.PP
-[1] 25647
-.RE
-.PP
-indicating that this job is job number 1 and that the process ID
-of the last process in the pipeline associated with this job is 25647.
-All of the processes in a single pipeline are members of the same job.
-.B Bash
-uses the
-.I job
-abstraction as the basis for job control.
-.PP
-To facilitate the implementation of the user interface to job
-control, the operating system maintains the notion of a \fIcurrent terminal
-process group ID\fP. Members of this process group (processes whose
-process group ID is equal to the current terminal process group ID)
-receive keyboard-generated signals such as
-.SM
-.BR SIGINT .
-These processes are said to be in the
-.IR foreground .
-.I Background
-processes are those whose process group ID differs from the terminal's;
-such processes are immune to keyboard-generated signals.
-Only foreground processes are allowed to read from or, if the
-user so specifies with \f(CWstty tostop\fP, write to the
-terminal.
-Background processes which attempt to read from (write to when
-\f(CWstty tostop\fP is in effect) the
-terminal are sent a
-.SM
-.B SIGTTIN (SIGTTOU)
-signal by the kernel's terminal driver,
-which, unless caught, suspends the process.
-.PP
-If the operating system on which
-.B bash
-is running supports
-job control,
-.B bash
-contains facilities to use it.
-Typing the
-.I suspend
-character (typically
-.BR ^Z ,
-Control-Z) while a process is running
-causes that process to be stopped and returns control to
-.BR bash .
-Typing the
-.I "delayed suspend"
-character (typically
-.BR ^Y ,
-Control-Y) causes the process to be stopped when it
-attempts to read input from the terminal, and control to
-be returned to
-.BR bash .
-The user may then manipulate the state of this job, using the
-.B bg
-command to continue it in the background, the
-.B fg
-command to continue it in the foreground, or
-the
-.B kill
-command to kill it. A \fB^Z\fP takes effect immediately,
-and has the additional side effect of causing pending output
-and typeahead to be discarded.
-.PP
-There are a number of ways to refer to a job in the shell.
-The character
-.B %
-introduces a job specification (\fIjobspec\fP). Job number
-.I n
-may be referred to as
-.BR %n .
-A job may also be referred to using a prefix of the name used to
-start it, or using a substring that appears in its command line.
-For example,
-.B %ce
-refers to a stopped
-.B ce
-job. If a prefix matches more than one job,
-.B bash
-reports an error. Using
-.BR %?ce ,
-on the other hand, refers to any job containing the string
-.B ce
-in its command line. If the substring matches more than one job,
-.B bash
-reports an error. The symbols
-.B %%
-and
-.B %+
-refer to the shell's notion of the
-.IR "current job" ,
-which is the last job stopped while it was in
-the foreground or started in the background.
-The
-.I "previous job"
-may be referenced using
-.BR %\- .
-If there is only a single job, \fB%+\fP and \fB%\-\fP can both be used
-to refer to that job.
-In output pertaining to jobs (e.g., the output of the
-.B jobs
-command), the current job is always flagged with a
-.BR + ,
-and the previous job with a
-.BR \- .
-A single % (with no accompanying job specification) also refers to the
-current job.
-.PP
-Simply naming a job can be used to bring it into the
-foreground:
-.B %1
-is a synonym for
-\fB``fg %1''\fP,
-bringing job 1 from the background into the foreground.
-Similarly,
-.B ``%1 &''
-resumes job 1 in the background, equivalent to
-\fB``bg %1''\fP.
-.PP
-The shell learns immediately whenever a job changes state.
-Normally,
-.B bash
-waits until it is about to print a prompt before reporting
-changes in a job's status so as to not interrupt
-any other output. If the
-.B \-b
-option to the
-.B set
-builtin command
-is enabled,
-.B bash
-reports such changes immediately.
-Any trap on
-.SM
-.B SIGCHLD
-is executed for each child that exits.
-.PP
-If an attempt to exit
-.B bash
-is made while jobs are stopped (or, if the \fBcheckjobs\fP shell option has
-been enabled using the \fBshopt\fP builtin, running), the shell prints a
-warning message, and, if the \fBcheckjobs\fP option is enabled, lists the
-jobs and their statuses.
-The
-.B jobs
-command may then be used to inspect their status.
-If a second attempt to exit is made without an intervening command,
-the shell does not print another warning, and any stopped
-jobs are terminated.
-.SH PROMPTING
-When executing interactively,
-.B bash
-displays the primary prompt
-.SM
-.B PS1
-when it is ready to read a command, and the secondary prompt
-.SM
-.B PS2
-when it needs more input to complete a command.
-.B Bash
-allows these prompt strings to be customized by inserting a number of
-backslash-escaped special characters that are decoded as follows:
-.RS
-.PD 0
-.TP
-.B \ea
-an ASCII bell character (07)
-.TP
-.B \ed
-the date in "Weekday Month Date" format (e.g., "Tue May 26")
-.TP
-.B \eD{\fIformat\fP}
-the \fIformat\fP is passed to \fIstrftime\fP(3) and the result is inserted
-into the prompt string; an empty \fIformat\fP results in a locale-specific
-time representation. The braces are required
-.TP
-.B \ee
-an ASCII escape character (033)
-.TP
-.B \eh
-the hostname up to the first `.'
-.TP
-.B \eH
-the hostname
-.TP
-.B \ej
-the number of jobs currently managed by the shell
-.TP
-.B \el
-the basename of the shell's terminal device name
-.TP
-.B \en
-newline
-.TP
-.B \er
-carriage return
-.TP
-.B \es
-the name of the shell, the basename of
-.B $0
-(the portion following the final slash)
-.TP
-.B \et
-the current time in 24-hour HH:MM:SS format
-.TP
-.B \eT
-the current time in 12-hour HH:MM:SS format
-.TP
-.B \e@
-the current time in 12-hour am/pm format
-.TP
-.B \eA
-the current time in 24-hour HH:MM format
-.TP
-.B \eu
-the username of the current user
-.TP
-.B \ev
-the version of \fBbash\fP (e.g., 2.00)
-.TP
-.B \eV
-the release of \fBbash\fP, version + patch level (e.g., 2.00.0)
-.TP
-.B \ew
-the current working directory, with
-.SM
-.B $HOME
-abbreviated with a tilde
-(uses the value of the
-.SM
-.B PROMPT_DIRTRIM
-variable)
-.TP
-.B \eW
-the basename of the current working directory, with
-.SM
-.B $HOME
-abbreviated with a tilde
-.TP
-.B \e!
-the history number of this command
-.TP
-.B \e#
-the command number of this command
-.TP
-.B \e$
-if the effective UID is 0, a
-.BR # ,
-otherwise a
-.B $
-.TP
-.B \e\fInnn\fP
-the character corresponding to the octal number \fInnn\fP
-.TP
-.B \e\e
-a backslash
-.TP
-.B \e[
-begin a sequence of non-printing characters, which could be used to
-embed a terminal control sequence into the prompt
-.TP
-.B \e]
-end a sequence of non-printing characters
-.PD
-.RE
-.PP
-The command number and the history number are usually different:
-the history number of a command is its position in the history
-list, which may include commands restored from the history file
-(see
-.SM
-.B HISTORY
-below), while the command number is the position in the sequence
-of commands executed during the current shell session.
-After the string is decoded, it is expanded via
-parameter expansion, command substitution, arithmetic
-expansion, and quote removal, subject to the value of the
-.B promptvars
-shell option (see the description of the
-.B shopt
-command under
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below).
-.SH READLINE
-This is the library that handles reading input when using an interactive
-shell, unless the
-.B \-\-noediting
-option is given at shell invocation.
-Line editing is also used when using the \fB\-e\fP option to the
-\fBread\fP builtin.
-By default, the line editing commands are similar to those of Emacs.
-A vi-style line editing interface is also available.
-Line editing can be enabled at any time using the
-.B \-o emacs
-or
-.B \-o vi
-options to the
-.B set
-builtin (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-To turn off line editing after the shell is running, use the
-.B +o emacs
-or
-.B +o vi
-options to the
-.B set
-builtin.
-.SS "Readline Notation"
-.PP
-In this section, the Emacs-style notation is used to denote
-keystrokes. Control keys are denoted by C\-\fIkey\fR, e.g., C\-n
-means Control\-N. Similarly,
-.I meta
-keys are denoted by M\-\fIkey\fR, so M\-x means Meta\-X. (On keyboards
-without a
-.I meta
-key, M\-\fIx\fP means ESC \fIx\fP, i.e., press the Escape key
-then the
-.I x
-key. This makes ESC the \fImeta prefix\fP.
-The combination M\-C\-\fIx\fP means ESC\-Control\-\fIx\fP,
-or press the Escape key
-then hold the Control key while pressing the
-.I x
-key.)
-.PP
-Readline commands may be given numeric
-.IR arguments ,
-which normally act as a repeat count.
-Sometimes, however, it is the sign of the argument that is significant.
-Passing a negative argument to a command that acts in the forward
-direction (e.g., \fBkill\-line\fP) causes that command to act in a
-backward direction.
-Commands whose behavior with arguments deviates from this are noted
-below.
-.PP
-When a command is described as \fIkilling\fP text, the text
-deleted is saved for possible future retrieval
-(\fIyanking\fP). The killed text is saved in a
-\fIkill ring\fP. Consecutive kills cause the text to be
-accumulated into one unit, which can be yanked all at once.
-Commands which do not kill text separate the chunks of text
-on the kill ring.
-.SS "Readline Initialization"
-.PP
-Readline is customized by putting commands in an initialization
-file (the \fIinputrc\fP file).
-The name of this file is taken from the value of the
-.SM
-.B INPUTRC
-variable. If that variable is unset, the default is
-.IR ~/.inputrc .
-When a program which uses the readline library starts up, the
-initialization file is read, and the key bindings and variables
-are set.
-There are only a few basic constructs allowed in the
-readline initialization file.
-Blank lines are ignored.
-Lines beginning with a \fB#\fP are comments.
-Lines beginning with a \fB$\fP indicate conditional constructs.
-Other lines denote key bindings and variable settings.
-.PP
-The default key-bindings may be changed with an
-.I inputrc
-file.
-Other programs that use this library may add their own commands
-and bindings.
-.PP
-For example, placing
-.RS
-.PP
-M\-Control\-u: universal\-argument
-.RE
-or
-.RS
-C\-Meta\-u: universal\-argument
-.RE
-into the
-.I inputrc
-would make M\-C\-u execute the readline command
-.IR universal\-argument .
-.PP
-The following symbolic character names are recognized:
-.IR RUBOUT ,
-.IR DEL ,
-.IR ESC ,
-.IR LFD ,
-.IR NEWLINE ,
-.IR RET ,
-.IR RETURN ,
-.IR SPC ,
-.IR SPACE ,
-and
-.IR TAB .
-.PP
-In addition to command names, readline allows keys to be bound
-to a string that is inserted when the key is pressed (a \fImacro\fP).
-.SS "Readline Key Bindings"
-.PP
-The syntax for controlling key bindings in the
-.I inputrc
-file is simple. All that is required is the name of the
-command or the text of a macro and a key sequence to which
-it should be bound. The name may be specified in one of two ways:
-as a symbolic key name, possibly with \fIMeta\-\fP or \fIControl\-\fP
-prefixes, or as a key sequence.
-.PP
-When using the form \fBkeyname\fP:\^\fIfunction\-name\fP or \fImacro\fP,
-.I keyname
-is the name of a key spelled out in English. For example:
-.sp
-.RS
-Control-u: universal\-argument
-.br
-Meta-Rubout: backward-kill-word
-.br
-Control-o: "> output"
-.RE
-.LP
-In the above example,
-.I C\-u
-is bound to the function
-.BR universal\-argument ,
-.I M\-DEL
-is bound to the function
-.BR backward\-kill\-word ,
-and
-.I C\-o
-is bound to run the macro
-expressed on the right hand side (that is, to insert the text
-.if t \f(CW> output\fP
-.if n ``> output''
-into the line).
-.PP
-In the second form, \fB"keyseq"\fP:\^\fIfunction\-name\fP or \fImacro\fP,
-.B keyseq
-differs from
-.B keyname
-above in that strings denoting
-an entire key sequence may be specified by placing the sequence
-within double quotes. Some GNU Emacs style key escapes can be
-used, as in the following example, but the symbolic character names
-are not recognized.
-.sp
-.RS
-"\eC\-u": universal\-argument
-.br
-"\eC\-x\eC\-r": re\-read\-init\-file
-.br
-"\ee[11~": "Function Key 1"
-.RE
-.PP
-In this example,
-.I C\-u
-is again bound to the function
-.BR universal\-argument .
-.I "C\-x C\-r"
-is bound to the function
-.BR re\-read\-init\-file ,
-and
-.I "ESC [ 1 1 ~"
-is bound to insert the text
-.if t \f(CWFunction Key 1\fP.
-.if n ``Function Key 1''.
-.PP
-The full set of GNU Emacs style escape sequences is
-.RS
-.PD 0
-.TP
-.B \eC\-
-control prefix
-.TP
-.B \eM\-
-meta prefix
-.TP
-.B \ee
-an escape character
-.TP
-.B \e\e
-backslash
-.TP
-.B \e"
-literal "
-.TP
-.B \e\(aq
-literal \(aq
-.RE
-.PD
-.PP
-In addition to the GNU Emacs style escape sequences, a second
-set of backslash escapes is available:
-.RS
-.PD 0
-.TP
-.B \ea
-alert (bell)
-.TP
-.B \eb
-backspace
-.TP
-.B \ed
-delete
-.TP
-.B \ef
-form feed
-.TP
-.B \en
-newline
-.TP
-.B \er
-carriage return
-.TP
-.B \et
-horizontal tab
-.TP
-.B \ev
-vertical tab
-.TP
-.B \e\fInnn\fP
-the eight-bit character whose value is the octal value \fInnn\fP
-(one to three digits)
-.TP
-.B \ex\fIHH\fP
-the eight-bit character whose value is the hexadecimal value \fIHH\fP
-(one or two hex digits)
-.RE
-.PD
-.PP
-When entering the text of a macro, single or double quotes must
-be used to indicate a macro definition.
-Unquoted text is assumed to be a function name.
-In the macro body, the backslash escapes described above are expanded.
-Backslash will quote any other character in the macro text,
-including " and \(aq.
-.PP
-.B Bash
-allows the current readline key bindings to be displayed or modified
-with the
-.B bind
-builtin command. The editing mode may be switched during interactive
-use by using the
-.B \-o
-option to the
-.B set
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below).
-.SS "Readline Variables"
-.PP
-Readline has variables that can be used to further customize its
-behavior. A variable may be set in the
-.I inputrc
-file with a statement of the form
-.RS
-.PP
-\fBset\fP \fIvariable\-name\fP \fIvalue\fP
-.RE
-.PP
-Except where noted, readline variables can take the values
-.B On
-or
-.B Off
-(without regard to case).
-Unrecognized variable names are ignored.
-When a variable value is read, empty or null values, "on" (case-insensitive),
-and "1" are equivalent to \fBOn\fP. All other values are equivalent to
-\fBOff\fP.
-The variables and their default values are:
-.PP
-.PD 0
-.TP
-.B bell\-style (audible)
-Controls what happens when readline wants to ring the terminal bell.
-If set to \fBnone\fP, readline never rings the bell. If set to
-\fBvisible\fP, readline uses a visible bell if one is available.
-If set to \fBaudible\fP, readline attempts to ring the terminal's bell.
-.TP
-.B bind\-tty\-special\-chars (On)
-If set to \fBOn\fP, readline attempts to bind the control characters
-treated specially by the kernel's terminal driver to their readline
-equivalents.
-.TP
-.B colored\-stats (Off)
-If set to \fBOn\fP, readline displays possible completions using different
-colors to indicate their file type.
-The color definitions are taken from the value of the \fBLS_COLORS\fP
-environment variable.
-.TP
-.B comment\-begin (``#'')
-The string that is inserted when the readline
-.B insert\-comment
-command is executed.
-This command is bound to
-.B M\-#
-in emacs mode and to
-.B #
-in vi command mode.
-.TP
-.B completion\-ignore\-case (Off)
-If set to \fBOn\fP, readline performs filename matching and completion
-in a case\-insensitive fashion.
-.TP
-.B completion\-prefix\-display\-length (0)
-The length in characters of the common prefix of a list of possible
-completions that is displayed without modification. When set to a
-value greater than zero, common prefixes longer than this value are
-replaced with an ellipsis when displaying possible completions.
-.TP
-.B completion\-query\-items (100)
-This determines when the user is queried about viewing
-the number of possible completions
-generated by the \fBpossible\-completions\fP command.
-It may be set to any integer value greater than or equal to
-zero. If the number of possible completions is greater than
-or equal to the value of this variable, the user is asked whether
-or not he wishes to view them; otherwise they are simply listed
-on the terminal.
-.TP
-.B convert\-meta (On)
-If set to \fBOn\fP, readline will convert characters with the
-eighth bit set to an ASCII key sequence
-by stripping the eighth bit and prefixing an
-escape character (in effect, using escape as the \fImeta prefix\fP).
-.TP
-.B disable\-completion (Off)
-If set to \fBOn\fP, readline will inhibit word completion. Completion
-characters will be inserted into the line as if they had been
-mapped to \fBself-insert\fP.
-.TP
-.B editing\-mode (emacs)
-Controls whether readline begins with a set of key bindings similar
-to \fIEmacs\fP or \fIvi\fP.
-.B editing\-mode
-can be set to either
-.B emacs
-or
-.BR vi .
-.TP
-.B echo\-control\-characters (On)
-When set to \fBOn\fP, on operating systems that indicate they support it,
-readline echoes a character corresponding to a signal generated from the
-keyboard.
-.TP
-.B enable\-keypad (Off)
-When set to \fBOn\fP, readline will try to enable the application
-keypad when it is called. Some systems need this to enable the
-arrow keys.
-.TP
-.B enable\-meta\-key (On)
-When set to \fBOn\fP, readline will try to enable any meta modifier
-key the terminal claims to support when it is called. On many terminals,
-the meta key is used to send eight-bit characters.
-.TP
-.B expand\-tilde (Off)
-If set to \fBOn\fP, tilde expansion is performed when readline
-attempts word completion.
-.TP
-.B history\-preserve\-point (Off)
-If set to \fBOn\fP, the history code attempts to place point at the
-same location on each history line retrieved with \fBprevious-history\fP
-or \fBnext-history\fP.
-.TP
-.B history\-size (0)
-Set the maximum number of history entries saved in the history list.
-If set to zero, any existing history entries are deleted and no new entries
-are saved.
-If set to a value less than zero, the number of history entries is not
-limited.
-By default, the number of history entries is not limited.
-.TP
-.B horizontal\-scroll\-mode (Off)
-When set to \fBOn\fP, makes readline use a single line for display,
-scrolling the input horizontally on a single screen line when it
-becomes longer than the screen width rather than wrapping to a new line.
-.TP
-.B input\-meta (Off)
-If set to \fBOn\fP, readline will enable eight-bit input (that is,
-it will not strip the high bit from the characters it reads),
-regardless of what the terminal claims it can support. The name
-.B meta\-flag
-is a synonym for this variable.
-.TP
-.B isearch\-terminators (``C\-[C\-J'')
-The string of characters that should terminate an incremental
-search without subsequently executing the character as a command.
-If this variable has not been given a value, the characters
-\fIESC\fP and \fIC\-J\fP will terminate an incremental search.
-.TP
-.B keymap (emacs)
-Set the current readline keymap. The set of valid keymap names is
-\fIemacs, emacs\-standard, emacs\-meta, emacs\-ctlx, vi,
-vi\-command\fP, and
-.IR vi\-insert .
-\fIvi\fP is equivalent to \fIvi\-command\fP; \fIemacs\fP is
-equivalent to \fIemacs\-standard\fP. The default value is
-.IR emacs ;
-the value of
-.B editing\-mode
-also affects the default keymap.
-.TP
-.B keyseq\-timeout (500)
-Specifies the duration \fIreadline\fP will wait for a character when reading an
-ambiguous key sequence (one that can form a complete key sequence using
-the input read so far, or can take additional input to complete a longer
-key sequence).
-If no input is received within the timeout, \fIreadline\fP will use the shorter
-but complete key sequence.
-The value is specified in milliseconds, so a value of 1000 means that
-\fIreadline\fP will wait one second for additional input.
-If this variable is set to a value less than or equal to zero, or to a
-non-numeric value, \fIreadline\fP will wait until another key is pressed to
-decide which key sequence to complete.
-.TP
-.B mark\-directories (On)
-If set to \fBOn\fP, completed directory names have a slash
-appended.
-.TP
-.B mark\-modified\-lines (Off)
-If set to \fBOn\fP, history lines that have been modified are displayed
-with a preceding asterisk (\fB*\fP).
-.TP
-.B mark\-symlinked\-directories (Off)
-If set to \fBOn\fP, completed names which are symbolic links to directories
-have a slash appended (subject to the value of
-\fBmark\-directories\fP).
-.TP
-.B match\-hidden\-files (On)
-This variable, when set to \fBOn\fP, causes readline to match files whose
-names begin with a `.' (hidden files) when performing filename
-completion.
-If set to \fBOff\fP, the leading `.' must be
-supplied by the user in the filename to be completed.
-.TP
-.B menu\-complete\-display\-prefix (Off)
-If set to \fBOn\fP, menu completion displays the common prefix of the
-list of possible completions (which may be empty) before cycling through
-the list.
-.TP
-.B output\-meta (Off)
-If set to \fBOn\fP, readline will display characters with the
-eighth bit set directly rather than as a meta-prefixed escape
-sequence.
-.TP
-.B page\-completions (On)
-If set to \fBOn\fP, readline uses an internal \fImore\fP-like pager
-to display a screenful of possible completions at a time.
-.TP
-.B print\-completions\-horizontally (Off)
-If set to \fBOn\fP, readline will display completions with matches
-sorted horizontally in alphabetical order, rather than down the screen.
-.TP
-.B revert\-all\-at\-newline (Off)
-If set to \fBOn\fP, readline will undo all changes to history lines
-before returning when \fBaccept\-line\fP is executed. By default,
-history lines may be modified and retain individual undo lists across
-calls to \fBreadline\fP.
-.TP
-.B show\-all\-if\-ambiguous (Off)
-This alters the default behavior of the completion functions. If
-set to
-.BR On ,
-words which have more than one possible completion cause the
-matches to be listed immediately instead of ringing the bell.
-.TP
-.B show\-all\-if\-unmodified (Off)
-This alters the default behavior of the completion functions in
-a fashion similar to \fBshow\-all\-if\-ambiguous\fP.
-If set to
-.BR On ,
-words which have more than one possible completion without any
-possible partial completion (the possible completions don't share
-a common prefix) cause the matches to be listed immediately instead
-of ringing the bell.
-.TP
-.B show\-mode\-in\-prompt (Off)
-If set to \fBOn\fP, add a character to the beginning of the prompt
-indicating the editing mode: emacs (@), vi command (:) or vi
-insertion (+).
-.TP
-.B skip\-completed\-text (Off)
-If set to \fBOn\fP, this alters the default completion behavior when
-inserting a single match into the line. It's only active when
-performing completion in the middle of a word. If enabled, readline
-does not insert characters from the completion that match characters
-after point in the word being completed, so portions of the word
-following the cursor are not duplicated.
-.TP
-.B visible\-stats (Off)
-If set to \fBOn\fP, a character denoting a file's type as reported
-by \fIstat\fP(2) is appended to the filename when listing possible
-completions.
-.PD
-.SS "Readline Conditional Constructs"
-.PP
-Readline implements a facility similar in spirit to the conditional
-compilation features of the C preprocessor which allows key
-bindings and variable settings to be performed as the result
-of tests. There are four parser directives used.
-.IP \fB$if\fP
-The
-.B $if
-construct allows bindings to be made based on the
-editing mode, the terminal being used, or the application using
-readline. The text of the test extends to the end of the line;
-no characters are required to isolate it.
-.RS
-.IP \fBmode\fP
-The \fBmode=\fP form of the \fB$if\fP directive is used to test
-whether readline is in emacs or vi mode.
-This may be used in conjunction
-with the \fBset keymap\fP command, for instance, to set bindings in
-the \fIemacs\-standard\fP and \fIemacs\-ctlx\fP keymaps only if
-readline is starting out in emacs mode.
-.IP \fBterm\fP
-The \fBterm=\fP form may be used to include terminal-specific
-key bindings, perhaps to bind the key sequences output by the
-terminal's function keys. The word on the right side of the
-.B =
-is tested against the both full name of the terminal and the portion
-of the terminal name before the first \fB\-\fP. This allows
-.I sun
-to match both
-.I sun
-and
-.IR sun\-cmd ,
-for instance.
-.IP \fBapplication\fP
-The \fBapplication\fP construct is used to include
-application-specific settings. Each program using the readline
-library sets the \fIapplication name\fP, and an initialization
-file can test for a particular value.
-This could be used to bind key sequences to functions useful for
-a specific program. For instance, the following command adds a
-key sequence that quotes the current or previous word in \fBbash\fP:
-.sp 1
-.RS
-.nf
-\fB$if\fP Bash
-# Quote the current or previous word
-"\eC\-xq": "\eeb\e"\eef\e""
-\fB$endif\fP
-.fi
-.RE
-.RE
-.IP \fB$endif\fP
-This command, as seen in the previous example, terminates an
-\fB$if\fP command.
-.IP \fB$else\fP
-Commands in this branch of the \fB$if\fP directive are executed if
-the test fails.
-.IP \fB$include\fP
-This directive takes a single filename as an argument and reads commands
-and bindings from that file. For example, the following directive
-would read \fI/etc/inputrc\fP:
-.sp 1
-.RS
-.nf
-\fB$include\fP \^ \fI/etc/inputrc\fP
-.fi
-.RE
-.SS Searching
-.PP
-Readline provides commands for searching through the command history
-(see
-.SM
-.B HISTORY
-below) for lines containing a specified string.
-There are two search modes:
-.I incremental
-and
-.IR non-incremental .
-.PP
-Incremental searches begin before the user has finished typing the
-search string.
-As each character of the search string is typed, readline displays
-the next entry from the history matching the string typed so far.
-An incremental search requires only as many characters as needed to
-find the desired history entry.
-The characters present in the value of the \fBisearch-terminators\fP
-variable are used to terminate an incremental search.
-If that variable has not been assigned a value the Escape and
-Control-J characters will terminate an incremental search.
-Control-G will abort an incremental search and restore the original
-line.
-When the search is terminated, the history entry containing the
-search string becomes the current line.
-.PP
-To find other matching entries in the history list, type Control-S or
-Control-R as appropriate.
-This will search backward or forward in the history for the next
-entry matching the search string typed so far.
-Any other key sequence bound to a readline command will terminate
-the search and execute that command.
-For instance, a \fInewline\fP will terminate the search and accept
-the line, thereby executing the command from the history list.
-.PP
-Readline remembers the last incremental search string. If two
-Control-Rs are typed without any intervening characters defining a
-new search string, any remembered search string is used.
-.PP
-Non-incremental searches read the entire search string before starting
-to search for matching history lines. The search string may be
-typed by the user or be part of the contents of the current line.
-.SS "Readline Command Names"
-.PP
-The following is a list of the names of the commands and the default
-key sequences to which they are bound.
-Command names without an accompanying key sequence are unbound by default.
-In the following descriptions, \fIpoint\fP refers to the current cursor
-position, and \fImark\fP refers to a cursor position saved by the
-\fBset\-mark\fP command.
-The text between the point and mark is referred to as the \fIregion\fP.
-.SS Commands for Moving
-.PP
-.PD 0
-.TP
-.B beginning\-of\-line (C\-a)
-Move to the start of the current line.
-.TP
-.B end\-of\-line (C\-e)
-Move to the end of the line.
-.TP
-.B forward\-char (C\-f)
-Move forward a character.
-.TP
-.B backward\-char (C\-b)
-Move back a character.
-.TP
-.B forward\-word (M\-f)
-Move forward to the end of the next word. Words are composed of
-alphanumeric characters (letters and digits).
-.TP
-.B backward\-word (M\-b)
-Move back to the start of the current or previous word.
-Words are composed of alphanumeric characters (letters and digits).
-.TP
-.B shell\-forward\-word
-Move forward to the end of the next word.
-Words are delimited by non-quoted shell metacharacters.
-.TP
-.B shell\-backward\-word
-Move back to the start of the current or previous word.
-Words are delimited by non-quoted shell metacharacters.
-.TP
-.B clear\-screen (C\-l)
-Clear the screen leaving the current line at the top of the screen.
-With an argument, refresh the current line without clearing the
-screen.
-.TP
-.B redraw\-current\-line
-Refresh the current line.
-.PD
-.SS Commands for Manipulating the History
-.PP
-.PD 0
-.TP
-.B accept\-line (Newline, Return)
-Accept the line regardless of where the cursor is. If this line is
-non-empty, add it to the history list according to the state of the
-.SM
-.B HISTCONTROL
-variable. If the line is a modified history
-line, then restore the history line to its original state.
-.TP
-.B previous\-history (C\-p)
-Fetch the previous command from the history list, moving back in
-the list.
-.TP
-.B next\-history (C\-n)
-Fetch the next command from the history list, moving forward in the
-list.
-.TP
-.B beginning\-of\-history (M\-<)
-Move to the first line in the history.
-.TP
-.B end\-of\-history (M\->)
-Move to the end of the input history, i.e., the line currently being
-entered.
-.TP
-.B reverse\-search\-history (C\-r)
-Search backward starting at the current line and moving `up' through
-the history as necessary. This is an incremental search.
-.TP
-.B forward\-search\-history (C\-s)
-Search forward starting at the current line and moving `down' through
-the history as necessary. This is an incremental search.
-.TP
-.B non\-incremental\-reverse\-search\-history (M\-p)
-Search backward through the history starting at the current line
-using a non-incremental search for a string supplied by the user.
-.TP
-.B non\-incremental\-forward\-search\-history (M\-n)
-Search forward through the history using a non-incremental search for
-a string supplied by the user.
-.TP
-.B history\-search\-forward
-Search forward through the history for the string of characters
-between the start of the current line and the point.
-This is a non-incremental search.
-.TP
-.B history\-search\-backward
-Search backward through the history for the string of characters
-between the start of the current line and the point.
-This is a non-incremental search.
-.TP
-.B yank\-nth\-arg (M\-C\-y)
-Insert the first argument to the previous command (usually
-the second word on the previous line) at point.
-With an argument
-.IR n ,
-insert the \fIn\fPth word from the previous command (the words
-in the previous command begin with word 0). A negative argument
-inserts the \fIn\fPth word from the end of the previous command.
-Once the argument \fIn\fP is computed, the argument is extracted
-as if the "!\fIn\fP" history expansion had been specified.
-.TP
-.B
-yank\-last\-arg (M\-.\^, M\-_\^)
-Insert the last argument to the previous command (the last word of
-the previous history entry).
-With a numeric argument, behave exactly like \fByank\-nth\-arg\fP.
-Successive calls to \fByank\-last\-arg\fP move back through the history
-list, inserting the last word (or the word specified by the argument to
-the first call) of each line in turn.
-Any numeric argument supplied to these successive calls determines
-the direction to move through the history. A negative argument switches
-the direction through the history (back or forward).
-The history expansion facilities are used to extract the last word,
-as if the "!$" history expansion had been specified.
-.TP
-.B shell\-expand\-line (M\-C\-e)
-Expand the line as the shell does. This
-performs alias and history expansion as well as all of the shell
-word expansions. See
-.SM
-.B HISTORY EXPANSION
-below for a description of history expansion.
-.TP
-.B history\-expand\-line (M\-^)
-Perform history expansion on the current line.
-See
-.SM
-.B HISTORY EXPANSION
-below for a description of history expansion.
-.TP
-.B magic\-space
-Perform history expansion on the current line and insert a space.
-See
-.SM
-.B HISTORY EXPANSION
-below for a description of history expansion.
-.TP
-.B alias\-expand\-line
-Perform alias expansion on the current line.
-See
-.SM
-.B ALIASES
-above for a description of alias expansion.
-.TP
-.B history\-and\-alias\-expand\-line
-Perform history and alias expansion on the current line.
-.TP
-.B insert\-last\-argument (M\-.\^, M\-_\^)
-A synonym for \fByank\-last\-arg\fP.
-.TP
-.B operate\-and\-get\-next (C\-o)
-Accept the current line for execution and fetch the next line
-relative to the current line from the history for editing. Any
-argument is ignored.
-.TP
-.B edit\-and\-execute\-command (C\-xC\-e)
-Invoke an editor on the current command line, and execute the result as shell
-commands.
-\fBBash\fP attempts to invoke
-.SM
-.BR $VISUAL ,
-.SM
-.BR $EDITOR ,
-and \fIemacs\fP as the editor, in that order.
-.PD
-.SS Commands for Changing Text
-.PP
-.PD 0
-.TP
-.B \fIend\-of\-file\fP (usually C\-d)
-The character indicating end-of-file as set, for example, by
-.if t \f(CWstty\fP.
-.if n ``stty''.
-If this character is read when there are no characters
-on the line, and point is at the beginning of the line, Readline
-interprets it as the end of input and returns
-.SM
-.BR EOF .
-.TP
-.B delete\-char (C\-d)
-Delete the character at point.
-If this function is bound to the
-same character as the tty \fBEOF\fP character, as \fBC\-d\fP
-commonly is, see above for the effects.
-.TP
-.B backward\-delete\-char (Rubout)
-Delete the character behind the cursor. When given a numeric argument,
-save the deleted text on the kill ring.
-.TP
-.B forward\-backward\-delete\-char
-Delete the character under the cursor, unless the cursor is at the
-end of the line, in which case the character behind the cursor is
-deleted.
-.TP
-.B quoted\-insert (C\-q, C\-v)
-Add the next character typed to the line verbatim. This is
-how to insert characters like \fBC\-q\fP, for example.
-.TP
-.B tab\-insert (C\-v TAB)
-Insert a tab character.
-.TP
-.B self\-insert (a,\ b,\ A,\ 1,\ !,\ ...)
-Insert the character typed.
-.TP
-.B transpose\-chars (C\-t)
-Drag the character before point forward over the character at point,
-moving point forward as well.
-If point is at the end of the line, then this transposes
-the two characters before point.
-Negative arguments have no effect.
-.TP
-.B transpose\-words (M\-t)
-Drag the word before point past the word after point,
-moving point over that word as well.
-If point is at the end of the line, this transposes
-the last two words on the line.
-.TP
-.B upcase\-word (M\-u)
-Uppercase the current (or following) word. With a negative argument,
-uppercase the previous word, but do not move point.
-.TP
-.B downcase\-word (M\-l)
-Lowercase the current (or following) word. With a negative argument,
-lowercase the previous word, but do not move point.
-.TP
-.B capitalize\-word (M\-c)
-Capitalize the current (or following) word. With a negative argument,
-capitalize the previous word, but do not move point.
-.TP
-.B overwrite\-mode
-Toggle overwrite mode. With an explicit positive numeric argument,
-switches to overwrite mode. With an explicit non-positive numeric
-argument, switches to insert mode. This command affects only
-\fBemacs\fP mode; \fBvi\fP mode does overwrite differently.
-Each call to \fIreadline()\fP starts in insert mode.
-In overwrite mode, characters bound to \fBself\-insert\fP replace
-the text at point rather than pushing the text to the right.
-Characters bound to \fBbackward\-delete\-char\fP replace the character
-before point with a space. By default, this command is unbound.
-.PD
-.SS Killing and Yanking
-.PP
-.PD 0
-.TP
-.B kill\-line (C\-k)
-Kill the text from point to the end of the line.
-.TP
-.B backward\-kill\-line (C\-x Rubout)
-Kill backward to the beginning of the line.
-.TP
-.B unix\-line\-discard (C\-u)
-Kill backward from point to the beginning of the line.
-The killed text is saved on the kill-ring.
-.\" There is no real difference between this and backward-kill-line
-.TP
-.B kill\-whole\-line
-Kill all characters on the current line, no matter where point is.
-.TP
-.B kill\-word (M\-d)
-Kill from point to the end of the current word, or if between
-words, to the end of the next word.
-Word boundaries are the same as those used by \fBforward\-word\fP.
-.TP
-.B backward\-kill\-word (M\-Rubout)
-Kill the word behind point.
-Word boundaries are the same as those used by \fBbackward\-word\fP.
-.TP
-.B shell\-kill\-word
-Kill from point to the end of the current word, or if between
-words, to the end of the next word.
-Word boundaries are the same as those used by \fBshell\-forward\-word\fP.
-.TP
-.B shell\-backward\-kill\-word
-Kill the word behind point.
-Word boundaries are the same as those used by \fBshell\-backward\-word\fP.
-.TP
-.B unix\-word\-rubout (C\-w)
-Kill the word behind point, using white space as a word boundary.
-The killed text is saved on the kill-ring.
-.TP
-.B unix\-filename\-rubout
-Kill the word behind point, using white space and the slash character
-as the word boundaries.
-The killed text is saved on the kill-ring.
-.TP
-.B delete\-horizontal\-space (M\-\e)
-Delete all spaces and tabs around point.
-.TP
-.B kill\-region
-Kill the text in the current region.
-.TP
-.B copy\-region\-as\-kill
-Copy the text in the region to the kill buffer.
-.TP
-.B copy\-backward\-word
-Copy the word before point to the kill buffer.
-The word boundaries are the same as \fBbackward\-word\fP.
-.TP
-.B copy\-forward\-word
-Copy the word following point to the kill buffer.
-The word boundaries are the same as \fBforward\-word\fP.
-.TP
-.B yank (C\-y)
-Yank the top of the kill ring into the buffer at point.
-.TP
-.B yank\-pop (M\-y)
-Rotate the kill ring, and yank the new top. Only works following
-.B yank
-or
-.BR yank\-pop .
-.PD
-.SS Numeric Arguments
-.PP
-.PD 0
-.TP
-.B digit\-argument (M\-0, M\-1, ..., M\-\-)
-Add this digit to the argument already accumulating, or start a new
-argument. M\-\- starts a negative argument.
-.TP
-.B universal\-argument
-This is another way to specify an argument.
-If this command is followed by one or more digits, optionally with a
-leading minus sign, those digits define the argument.
-If the command is followed by digits, executing
-.B universal\-argument
-again ends the numeric argument, but is otherwise ignored.
-As a special case, if this command is immediately followed by a
-character that is neither a digit or minus sign, the argument count
-for the next command is multiplied by four.
-The argument count is initially one, so executing this function the
-first time makes the argument count four, a second time makes the
-argument count sixteen, and so on.
-.PD
-.SS Completing
-.PP
-.PD 0
-.TP
-.B complete (TAB)
-Attempt to perform completion on the text before point.
-.B Bash
-attempts completion treating the text as a variable (if the
-text begins with \fB$\fP), username (if the text begins with
-\fB~\fP), hostname (if the text begins with \fB@\fP), or
-command (including aliases and functions) in turn. If none
-of these produces a match, filename completion is attempted.
-.TP
-.B possible\-completions (M\-?)
-List the possible completions of the text before point.
-.TP
-.B insert\-completions (M\-*)
-Insert all completions of the text before point
-that would have been generated by
-\fBpossible\-completions\fP.
-.TP
-.B menu\-complete
-Similar to \fBcomplete\fP, but replaces the word to be completed
-with a single match from the list of possible completions.
-Repeated execution of \fBmenu\-complete\fP steps through the list
-of possible completions, inserting each match in turn.
-At the end of the list of completions, the bell is rung
-(subject to the setting of \fBbell\-style\fP)
-and the original text is restored.
-An argument of \fIn\fP moves \fIn\fP positions forward in the list
-of matches; a negative argument may be used to move backward
-through the list.
-This command is intended to be bound to \fBTAB\fP, but is unbound
-by default.
-.TP
-.B menu\-complete\-backward
-Identical to \fBmenu\-complete\fP, but moves backward through the list
-of possible completions, as if \fBmenu\-complete\fP had been given a
-negative argument. This command is unbound by default.
-.TP
-.B delete\-char\-or\-list
-Deletes the character under the cursor if not at the beginning or
-end of the line (like \fBdelete\-char\fP).
-If at the end of the line, behaves identically to
-\fBpossible\-completions\fP.
-This command is unbound by default.
-.TP
-.B complete\-filename (M\-/)
-Attempt filename completion on the text before point.
-.TP
-.B possible\-filename\-completions (C\-x /)
-List the possible completions of the text before point,
-treating it as a filename.
-.TP
-.B complete\-username (M\-~)
-Attempt completion on the text before point, treating
-it as a username.
-.TP
-.B possible\-username\-completions (C\-x ~)
-List the possible completions of the text before point,
-treating it as a username.
-.TP
-.B complete\-variable (M\-$)
-Attempt completion on the text before point, treating
-it as a shell variable.
-.TP
-.B possible\-variable\-completions (C\-x $)
-List the possible completions of the text before point,
-treating it as a shell variable.
-.TP
-.B complete\-hostname (M\-@)
-Attempt completion on the text before point, treating
-it as a hostname.
-.TP
-.B possible\-hostname\-completions (C\-x @)
-List the possible completions of the text before point,
-treating it as a hostname.
-.TP
-.B complete\-command (M\-!)
-Attempt completion on the text before point, treating
-it as a command name. Command completion attempts to
-match the text against aliases, reserved words, shell
-functions, shell builtins, and finally executable filenames,
-in that order.
-.TP
-.B possible\-command\-completions (C\-x !)
-List the possible completions of the text before point,
-treating it as a command name.
-.TP
-.B dynamic\-complete\-history (M\-TAB)
-Attempt completion on the text before point, comparing
-the text against lines from the history list for possible
-completion matches.
-.TP
-.B dabbrev\-expand
-Attempt menu completion on the text before point, comparing
-the text against lines from the history list for possible
-completion matches.
-.TP
-.B complete\-into\-braces (M\-{)
-Perform filename completion and insert the list of possible completions
-enclosed within braces so the list is available to the shell (see
-.B Brace Expansion
-above).
-.PD
-.SS Keyboard Macros
-.PP
-.PD 0
-.TP
-.B start\-kbd\-macro (C\-x (\^)
-Begin saving the characters typed into the current keyboard macro.
-.TP
-.B end\-kbd\-macro (C\-x )\^)
-Stop saving the characters typed into the current keyboard macro
-and store the definition.
-.TP
-.B call\-last\-kbd\-macro (C\-x e)
-Re-execute the last keyboard macro defined, by making the characters
-in the macro appear as if typed at the keyboard.
-.TP
-.B print\-last\-kbd\-macro ()
-Print the last keyboard macro defined in a format suitable for the
-\fIinputrc\fP file.
-.PD
-.SS Miscellaneous
-.PP
-.PD 0
-.TP
-.B re\-read\-init\-file (C\-x C\-r)
-Read in the contents of the \fIinputrc\fP file, and incorporate
-any bindings or variable assignments found there.
-.TP
-.B abort (C\-g)
-Abort the current editing command and
-ring the terminal's bell (subject to the setting of
-.BR bell\-style ).
-.TP
-.B do\-uppercase\-version (M\-a, M\-b, M\-\fIx\fP, ...)
-If the metafied character \fIx\fP is lowercase, run the command
-that is bound to the corresponding uppercase character.
-.TP
-.B prefix\-meta (ESC)
-Metafy the next character typed.
-.SM
-.B ESC
-.B f
-is equivalent to
-.BR Meta\-f .
-.TP
-.B undo (C\-_, C\-x C\-u)
-Incremental undo, separately remembered for each line.
-.TP
-.B revert\-line (M\-r)
-Undo all changes made to this line. This is like executing the
-.B undo
-command enough times to return the line to its initial state.
-.TP
-.B tilde\-expand (M\-&)
-Perform tilde expansion on the current word.
-.TP
-.B set\-mark (C\-@, M\-<space>)
-Set the mark to the point. If a
-numeric argument is supplied, the mark is set to that position.
-.TP
-.B exchange\-point\-and\-mark (C\-x C\-x)
-Swap the point with the mark. The current cursor position is set to
-the saved position, and the old cursor position is saved as the mark.
-.TP
-.B character\-search (C\-])
-A character is read and point is moved to the next occurrence of that
-character. A negative count searches for previous occurrences.
-.TP
-.B character\-search\-backward (M\-C\-])
-A character is read and point is moved to the previous occurrence of that
-character. A negative count searches for subsequent occurrences.
-.TP
-.B skip\-csi\-sequence
-Read enough characters to consume a multi-key sequence such as those
-defined for keys like Home and End. Such sequences begin with a
-Control Sequence Indicator (CSI), usually ESC\-[. If this sequence is
-bound to "\e[", keys producing such sequences will have no effect
-unless explicitly bound to a readline command, instead of inserting
-stray characters into the editing buffer. This is unbound by default,
-but usually bound to ESC\-[.
-.TP
-.B insert\-comment (M\-#)
-Without a numeric argument, the value of the readline
-.B comment\-begin
-variable is inserted at the beginning of the current line.
-If a numeric argument is supplied, this command acts as a toggle: if
-the characters at the beginning of the line do not match the value
-of \fBcomment\-begin\fP, the value is inserted, otherwise
-the characters in \fBcomment\-begin\fP are deleted from the beginning of
-the line.
-In either case, the line is accepted as if a newline had been typed.
-The default value of
-\fBcomment\-begin\fP causes this command to make the current line
-a shell comment.
-If a numeric argument causes the comment character to be removed, the line
-will be executed by the shell.
-.TP
-.B glob\-complete\-word (M\-g)
-The word before point is treated as a pattern for pathname expansion,
-with an asterisk implicitly appended. This pattern is used to
-generate a list of matching filenames for possible completions.
-.TP
-.B glob\-expand\-word (C\-x *)
-The word before point is treated as a pattern for pathname expansion,
-and the list of matching filenames is inserted, replacing the word.
-If a numeric argument is supplied, an asterisk is appended before
-pathname expansion.
-.TP
-.B glob\-list\-expansions (C\-x g)
-The list of expansions that would have been generated by
-.B glob\-expand\-word
-is displayed, and the line is redrawn.
-If a numeric argument is supplied, an asterisk is appended before
-pathname expansion.
-.TP
-.B dump\-functions
-Print all of the functions and their key bindings to the
-readline output stream. If a numeric argument is supplied,
-the output is formatted in such a way that it can be made part
-of an \fIinputrc\fP file.
-.TP
-.B dump\-variables
-Print all of the settable readline variables and their values to the
-readline output stream. If a numeric argument is supplied,
-the output is formatted in such a way that it can be made part
-of an \fIinputrc\fP file.
-.TP
-.B dump\-macros
-Print all of the readline key sequences bound to macros and the
-strings they output. If a numeric argument is supplied,
-the output is formatted in such a way that it can be made part
-of an \fIinputrc\fP file.
-.TP
-.B display\-shell\-version (C\-x C\-v)
-Display version information about the current instance of
-.BR bash .
-.PD
-.SS Programmable Completion
-.PP
-When word completion is attempted for an argument to a command for
-which a completion specification (a \fIcompspec\fP) has been defined
-using the \fBcomplete\fP builtin (see
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below), the programmable completion facilities are invoked.
-.PP
-First, the command name is identified.
-If the command word is the empty string (completion attempted at the
-beginning of an empty line), any compspec defined with
-the \fB\-E\fP option to \fBcomplete\fP is used.
-If a compspec has been defined for that command, the
-compspec is used to generate the list of possible completions for the word.
-If the command word is a full pathname, a compspec for the full
-pathname is searched for first.
-If no compspec is found for the full pathname, an attempt is made to
-find a compspec for the portion following the final slash.
-If those searches do not result in a compspec, any compspec defined with
-the \fB\-D\fP option to \fBcomplete\fP is used as the default.
-.PP
-Once a compspec has been found, it is used to generate the list of
-matching words.
-If a compspec is not found, the default \fBbash\fP completion as
-described above under \fBCompleting\fP is performed.
-.PP
-First, the actions specified by the compspec are used.
-Only matches which are prefixed by the word being completed are
-returned.
-When the
-.B \-f
-or
-.B \-d
-option is used for filename or directory name completion, the shell
-variable
-.SM
-.B FIGNORE
-is used to filter the matches.
-.PP
-Any completions specified by a pathname expansion pattern to the
-\fB\-G\fP option are generated next.
-The words generated by the pattern need not match the word
-being completed.
-The
-.SM
-.B GLOBIGNORE
-shell variable is not used to filter the matches, but the
-.SM
-.B FIGNORE
-variable is used.
-.PP
-Next, the string specified as the argument to the \fB\-W\fP option
-is considered.
-The string is first split using the characters in the
-.SM
-.B IFS
-special variable as delimiters.
-Shell quoting is honored.
-Each word is then expanded using
-brace expansion, tilde expansion, parameter and variable expansion,
-command substitution, and arithmetic expansion,
-as described above under
-.SM
-.BR EXPANSION .
-The results are split using the rules described above under
-\fBWord Splitting\fP.
-The results of the expansion are prefix-matched against the word being
-completed, and the matching words become the possible completions.
-.PP
-After these matches have been generated, any shell function or command
-specified with the \fB\-F\fP and \fB\-C\fP options is invoked.
-When the command or function is invoked, the
-.SM
-.BR COMP_LINE ,
-.SM
-.BR COMP_POINT ,
-.SM
-.BR COMP_KEY ,
-and
-.SM
-.B COMP_TYPE
-variables are assigned values as described above under
-\fBShell Variables\fP.
-If a shell function is being invoked, the
-.SM
-.B COMP_WORDS
-and
-.SM
-.B COMP_CWORD
-variables are also set.
-When the function or command is invoked,
-the first argument (\fB$1\fP) is the name of the command whose arguments are
-being completed,
-the second argument (\fB$2\fP) is the word being completed,
-and the third argument (\fB$3\fP) is the word preceding the word being
-completed on the current command line.
-No filtering of the generated completions against the word being completed
-is performed; the function or command has complete freedom in generating
-the matches.
-.PP
-Any function specified with \fB\-F\fP is invoked first.
-The function may use any of the shell facilities, including the
-\fBcompgen\fP builtin described below, to generate the matches.
-It must put the possible completions in the
-.SM
-.B COMPREPLY
-array variable, one per array element.
-.PP
-Next, any command specified with the \fB\-C\fP option is invoked
-in an environment equivalent to command substitution.
-It should print a list of completions, one per line, to the
-standard output.
-Backslash may be used to escape a newline, if necessary.
-.PP
-After all of the possible completions are generated, any filter
-specified with the \fB\-X\fP option is applied to the list.
-The filter is a pattern as used for pathname expansion; a \fB&\fP
-in the pattern is replaced with the text of the word being completed.
-A literal \fB&\fP may be escaped with a backslash; the backslash
-is removed before attempting a match.
-Any completion that matches the pattern will be removed from the list.
-A leading \fB!\fP negates the pattern; in this case any completion
-not matching the pattern will be removed.
-.PP
-Finally, any prefix and suffix specified with the \fB\-P\fP and \fB\-S\fP
-options are added to each member of the completion list, and the result is
-returned to the readline completion code as the list of possible
-completions.
-.PP
-If the previously-applied actions do not generate any matches, and the
-\fB\-o dirnames\fP option was supplied to \fBcomplete\fP when the
-compspec was defined, directory name completion is attempted.
-.PP
-If the \fB\-o plusdirs\fP option was supplied to \fBcomplete\fP when the
-compspec was defined, directory name completion is attempted and any
-matches are added to the results of the other actions.
-.PP
-By default, if a compspec is found, whatever it generates is returned
-to the completion code as the full set of possible completions.
-The default \fBbash\fP completions are not attempted, and the readline
-default of filename completion is disabled.
-If the \fB\-o bashdefault\fP option was supplied to \fBcomplete\fP when
-the compspec was defined, the \fBbash\fP default completions are attempted
-if the compspec generates no matches.
-If the \fB\-o default\fP option was supplied to \fBcomplete\fP when the
-compspec was defined, readline's default completion will be performed
-if the compspec (and, if attempted, the default \fBbash\fP completions)
-generate no matches.
-.PP
-When a compspec indicates that directory name completion is desired,
-the programmable completion functions force readline to append a slash
-to completed names which are symbolic links to directories, subject to
-the value of the \fBmark\-directories\fP readline variable, regardless
-of the setting of the \fBmark-symlinked\-directories\fP readline variable.
-.PP
-There is some support for dynamically modifying completions. This is
-most useful when used in combination with a default completion specified
-with \fBcomplete -D\fP.
-It's possible for shell functions executed as completion
-handlers to indicate that completion should be retried by returning an
-exit status of 124. If a shell function returns 124, and changes
-the compspec associated with the command on which completion is being
-attempted (supplied as the first argument when the function is executed),
-programmable completion restarts from the beginning, with an
-attempt to find a new compspec for that command. This allows a set of
-completions to be built dynamically as completion is attempted, rather than
-being loaded all at once.
-.PP
-For instance, assuming that there is a library of compspecs, each kept in a
-file corresponding to the name of the command, the following default
-completion function would load completions dynamically:
-.PP
-\f(CW_completion_loader()
-.br
-{
-.br
- . "/etc/bash_completion.d/$1.sh" >/dev/null 2>&1 && return 124
-.br
-}
-.br
-complete -D -F _completion_loader -o bashdefault -o default
-.br
-\fP
-.SH HISTORY
-When the
-.B \-o history
-option to the
-.B set
-builtin is enabled, the shell provides access to the
-\fIcommand history\fP,
-the list of commands previously typed.
-The value of the
-.SM
-.B HISTSIZE
-variable is used as the
-number of commands to save in a history list.
-The text of the last
-.SM
-.B HISTSIZE
-commands (default 500) is saved. The shell
-stores each command in the history list prior to parameter and
-variable expansion (see
-.SM
-.B EXPANSION
-above) but after history expansion is performed, subject to the
-values of the shell variables
-.SM
-.B HISTIGNORE
-and
-.SM
-.BR HISTCONTROL .
-.PP
-On startup, the history is initialized from the file named by
-the variable
-.SM
-.B HISTFILE
-(default \fI~/.bash_history\fP).
-The file named by the value of
-.SM
-.B HISTFILE
-is truncated, if necessary, to contain no more than
-the number of lines specified by the value of
-.SM
-.BR HISTFILESIZE .
-If \fBHISTFILESIZE\fP is unset, or set to null, a non-numeric value,
-or a numeric value less than zero, the history file is not truncated.
-When the history file is read,
-lines beginning with the history comment character followed immediately
-by a digit are interpreted as timestamps for the preceding history line.
-These timestamps are optionally displayed depending on the value of the
-.SM
-.B HISTTIMEFORMAT
-variable.
-When a shell with history enabled exits, the last
-.SM
-.B $HISTSIZE
-lines are copied from the history list to
-.SM
-.BR $HISTFILE .
-If the
-.B histappend
-shell option is enabled
-(see the description of
-.B shopt
-under
-.SM
-.B "SHELL BUILTIN COMMANDS"
-below), the lines are appended to the history file,
-otherwise the history file is overwritten.
-If
-.SM
-.B HISTFILE
-is unset, or if the history file is unwritable, the history is
-not saved.
-If the
-.SM
-.B HISTTIMEFORMAT
-variable is set, time stamps are written to the history file, marked
-with the history comment character, so
-they may be preserved across shell sessions.
-This uses the history comment character to distinguish timestamps from
-other history lines.
-After saving the history, the history file is truncated
-to contain no more than
-.SM
-.B HISTFILESIZE
-lines. If
-.SM
-.B HISTFILESIZE
-is unset, or set to null, a non-numeric value,
-or a numeric value less than zero, the history file is not truncated.
-.PP
-The builtin command
-.B fc
-(see
-.SM
-.B SHELL BUILTIN COMMANDS
-below) may be used to list or edit and re-execute a portion of
-the history list.
-The
-.B history
-builtin may be used to display or modify the history list and
-manipulate the history file.
-When using command-line editing, search commands
-are available in each editing mode that provide access to the
-history list.
-.PP
-The shell allows control over which commands are saved on the history
-list. The
-.SM
-.B HISTCONTROL
-and
-.SM
-.B HISTIGNORE
-variables may be set to cause the shell to save only a subset of the
-commands entered.
-The
-.B cmdhist
-shell option, if enabled, causes the shell to attempt to save each
-line of a multi-line command in the same history entry, adding
-semicolons where necessary to preserve syntactic correctness.
-The
-.B lithist
-shell option causes the shell to save the command with embedded newlines
-instead of semicolons. See the description of the
-.B shopt
-builtin below under
-.SM
-.B "SHELL BUILTIN COMMANDS"
-for information on setting and unsetting shell options.
-.SH "HISTORY EXPANSION"
-.PP
-The shell supports a history expansion feature that
-is similar to the history expansion in
-.BR csh.
-This section describes what syntax features are available. This
-feature is enabled by default for interactive shells, and can be
-disabled using the
-.B +H
-option to the
-.B set
-builtin command (see
-.SM
-.B SHELL BUILTIN COMMANDS
-below). Non-interactive shells do not perform history expansion
-by default.
-.PP
-History expansions introduce words from the history list into
-the input stream, making it easy to repeat commands, insert the
-arguments to a previous command into the current input line, or
-fix errors in previous commands quickly.
-.PP
-History expansion is performed immediately after a complete line
-is read, before the shell breaks it into words.
-It takes place in two parts.
-The first is to determine which line from the history list
-to use during substitution.
-The second is to select portions of that line for inclusion into
-the current one.
-The line selected from the history is the \fIevent\fP,
-and the portions of that line that are acted upon are \fIwords\fP.
-Various \fImodifiers\fP are available to manipulate the selected words.
-The line is broken into words in the same fashion as when reading input,
-so that several \fImetacharacter\fP-separated words surrounded by
-quotes are considered one word.
-History expansions are introduced by the appearance of the
-history expansion character, which is \^\fB!\fP\^ by default.
-Only backslash (\^\fB\e\fP\^) and single quotes can quote
-the history expansion character.
-.PP
-Several characters inhibit history expansion if found immediately
-following the history expansion character, even if it is unquoted:
-space, tab, newline, carriage return, and \fB=\fP.
-If the \fBextglob\fP shell option is enabled, \fB(\fP will also
-inhibit expansion.
-.PP
-Several shell options settable with the
-.B shopt
-builtin may be used to tailor the behavior of history expansion.
-If the
-.B histverify
-shell option is enabled (see the description of the
-.B shopt
-builtin below), and
-.B readline
-is being used, history substitutions are not immediately passed to
-the shell parser.
-Instead, the expanded line is reloaded into the
-.B readline
-editing buffer for further modification.
-If
-.B readline
-is being used, and the
-.B histreedit
-shell option is enabled, a failed history substitution will be reloaded
-into the
-.B readline
-editing buffer for correction.
-The
-.B \-p
-option to the
-.B history
-builtin command may be used to see what a history expansion will
-do before using it.
-The
-.B \-s
-option to the
-.B history
-builtin may be used to add commands to the end of the history list
-without actually executing them, so that they are available for
-subsequent recall.
-.PP
-The shell allows control of the various characters used by the
-history expansion mechanism (see the description of
-.B histchars
-above under
-.BR "Shell Variables" ).
-The shell uses
-the history comment character to mark history timestamps when
-writing the history file.
-.SS Event Designators
-.PP
-An event designator is a reference to a command line entry in the
-history list.
-Unless the reference is absolute, events are relative to the current
-position in the history list.
-.PP
-.PD 0
-.TP
-.B !
-Start a history substitution, except when followed by a
-.BR blank ,
-newline, carriage return, =
-or ( (when the \fBextglob\fP shell option is enabled using
-the \fBshopt\fP builtin).
-.TP
-.B !\fIn\fR
-Refer to command line
-.IR n .
-.TP
-.B !\-\fIn\fR
-Refer to the current command minus
-.IR n .
-.TP
-.B !!
-Refer to the previous command. This is a synonym for `!\-1'.
-.TP
-.B !\fIstring\fR
-Refer to the most recent command preceding the current position in the
-history list starting with
-.IR string .
-.TP
-.B !?\fIstring\fR\fB[?]\fR
-Refer to the most recent command preceding the current position in the
-history list containing
-.IR string .
-The trailing \fB?\fP may be omitted if
-.I string
-is followed immediately by a newline.
-.TP
-.B \d\s+2^\s-2\u\fIstring1\fP\d\s+2^\s-2\u\fIstring2\fP\d\s+2^\s-2\u
-Quick substitution. Repeat the previous command, replacing
-.I string1
-with
-.IR string2 .
-Equivalent to
-``!!:s/\fIstring1\fP/\fIstring2\fP/''
-(see \fBModifiers\fP below).
-.TP
-.B !#
-The entire command line typed so far.
-.PD
-.SS Word Designators
-.PP
-Word designators are used to select desired words from the event.
-A
-.B :
-separates the event specification from the word designator.
-It may be omitted if the word designator begins with a
-.BR ^ ,
-.BR $ ,
-.BR * ,
-.BR \- ,
-or
-.BR % .
-Words are numbered from the beginning of the line,
-with the first word being denoted by 0 (zero).
-Words are inserted into the current line separated by single spaces.
-.PP
-.PD 0
-.TP
-.B 0 (zero)
-The zeroth word. For the shell, this is the command
-word.
-.TP
-.I n
-The \fIn\fRth word.
-.TP
-.B ^
-The first argument. That is, word 1.
-.TP
-.B $
-The last word. This is usually the last argument, but will expand to the
-zeroth word if there is only one word in the line.
-.TP
-.B %
-The word matched by the most recent `?\fIstring\fR?' search.
-.TP
-.I x\fB\-\fPy
-A range of words; `\-\fIy\fR' abbreviates `0\-\fIy\fR'.
-.TP
-.B *
-All of the words but the zeroth. This is a synonym
-for `\fI1\-$\fP'. It is not an error to use
-.B *
-if there is just one
-word in the event; the empty string is returned in that case.
-.TP
-.B x*
-Abbreviates \fIx\-$\fP.
-.TP
-.B x\-
-Abbreviates \fIx\-$\fP like \fBx*\fP, but omits the last word.
-.PD
-.PP
-If a word designator is supplied without an event specification, the
-previous command is used as the event.
-.SS Modifiers
-.PP
-After the optional word designator, there may appear a sequence of
-one or more of the following modifiers, each preceded by a `:'.
-.PP
-.PD 0
-.PP
-.TP
-.B h
-Remove a trailing filename component, leaving only the head.
-.TP
-.B t
-Remove all leading filename components, leaving the tail.
-.TP
-.B r
-Remove a trailing suffix of the form \fI.xxx\fP, leaving the
-basename.
-.TP
-.B e
-Remove all but the trailing suffix.
-.TP
-.B p
-Print the new command but do not execute it.
-.TP
-.B q
-Quote the substituted words, escaping further substitutions.
-.TP
-.B x
-Quote the substituted words as with
-.BR q ,
-but break into words at
-.B blanks
-and newlines.
-.TP
-.B s/\fIold\fP/\fInew\fP/
-Substitute
-.I new
-for the first occurrence of
-.I old
-in the event line. Any delimiter can be used in place of /. The
-final delimiter is optional if it is the last character of the
-event line. The delimiter may be quoted in
-.I old
-and
-.I new
-with a single backslash. If & appears in
-.IR new ,
-it is replaced by
-.IR old .
-A single backslash will quote the &. If
-.I old
-is null, it is set to the last
-.I old
-substituted, or, if no previous history substitutions took place,
-the last
-.I string
-in a
-.B !?\fIstring\fR\fB[?]\fR
-search.
-.TP
-.B &
-Repeat the previous substitution.
-.TP
-.B g
-Cause changes to be applied over the entire event line. This is
-used in conjunction with `\fB:s\fP' (e.g., `\fB:gs/\fIold\fP/\fInew\fP/\fR')
-or `\fB:&\fP'. If used with
-`\fB:s\fP', any delimiter can be used
-in place of /, and the final delimiter is optional
-if it is the last character of the event line.
-An \fBa\fP may be used as a synonym for \fBg\fP.
-.TP
-.B G
-Apply the following `\fBs\fP' modifier once to each word in the event line.
-.PD
-.SH "SHELL BUILTIN COMMANDS"
-.\" start of bash_builtins
-.zZ
-.PP
-Unless otherwise noted, each builtin command documented in this
-section as accepting options preceded by
-.B \-
-accepts
-.B \-\-
-to signify the end of the options.
-The \fB:\fP, \fBtrue\fP, \fBfalse\fP, and \fBtest\fP builtins
-do not accept options and do not treat \fB\-\-\fP specially.
-The \fBexit\fP, \fBlogout\fP, \fBbreak\fP, \fBcontinue\fP, \fBlet\fP,
-and \fBshift\fP builtins accept and process arguments beginning with
-\fB\-\fP without requiring \fB\-\-\fP.
-Other builtins that accept arguments but are not specified as accepting
-options interpret arguments beginning with \fB\-\fP as invalid options and
-require \fB\-\-\fP to prevent this interpretation.
-.sp .5
-.PD 0
-.TP
-\fB:\fP [\fIarguments\fP]
-.PD
-No effect; the command does nothing beyond expanding
-.I arguments
-and performing any specified
-redirections. A zero exit code is returned.
-.TP
-\fB .\| \fP \fIfilename\fP [\fIarguments\fP]
-.PD 0
-.TP
-\fBsource\fP \fIfilename\fP [\fIarguments\fP]
-.PD
-Read and execute commands from
-.I filename
-in the current
-shell environment and return the exit status of the last command
-executed from
-.IR filename .
-If
-.I filename
-does not contain a slash, filenames in
-.SM
-.B PATH
-are used to find the directory containing
-.IR filename .
-The file searched for in
-.SM
-.B PATH
-need not be executable.
-When \fBbash\fP is not in \fIposix mode\fP, the current directory is
-searched if no file is found in
-.SM
-.BR PATH .
-If the
-.B sourcepath
-option to the
-.B shopt
-builtin command is turned off, the
-.SM
-.B PATH
-is not searched.
-If any \fIarguments\fP are supplied, they become the positional
-parameters when \fIfilename\fP is executed. Otherwise the positional
-parameters are unchanged.
-The return status is the status of the last command exited within
-the script (0 if no commands are executed), and false if
-.I filename
-is not found or cannot be read.
-.TP
-\fBalias\fP [\fB\-p\fP] [\fIname\fP[=\fIvalue\fP] ...]
-\fBAlias\fP with no arguments or with the
-.B \-p
-option prints the list of aliases in the form
-\fBalias\fP \fIname\fP=\fIvalue\fP on standard output.
-When arguments are supplied, an alias is defined for
-each \fIname\fP whose \fIvalue\fP is given.
-A trailing space in \fIvalue\fP causes the next word to be
-checked for alias substitution when the alias is expanded.
-For each \fIname\fP in the argument list for which no \fIvalue\fP
-is supplied, the name and value of the alias is printed.
-\fBAlias\fP returns true unless a \fIname\fP is given for which
-no alias has been defined.
-.TP
-\fBbg\fP [\fIjobspec\fP ...]
-Resume each suspended job \fIjobspec\fP in the background, as if it
-had been started with
-.BR & .
-If
-.I jobspec
-is not present, the shell's notion of the \fIcurrent job\fP is used.
-.B bg
-.I jobspec
-returns 0 unless run when job control is disabled or, when run with
-job control enabled, any specified \fIjobspec\fP was not found
-or was started without job control.
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] [\fB\-lpsvPSVX\fP]
-.PD 0
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] [\fB\-q\fP \fIfunction\fP] [\fB\-u\fP \fIfunction\fP] [\fB\-r\fP \fIkeyseq\fP]
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] \fB\-f\fP \fIfilename\fP
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] \fB\-x\fP \fIkeyseq\fP:\fIshell\-command\fP
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] \fIkeyseq\fP:\fIfunction\-name\fP
-.TP
-\fBbind\fP [\fB\-m\fP \fIkeymap\fP] \fIkeyseq\fP:\fIreadline\-command\fP
-.PD
-Display current
-.B readline
-key and function bindings, bind a key sequence to a
-.B readline
-function or macro, or set a
-.B readline
-variable.
-Each non-option argument is a command as it would appear in
-.IR .inputrc ,
-but each binding or command must be passed as a separate argument;
-e.g., '"\eC\-x\eC\-r": re\-read\-init\-file'.
-Options, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-m \fIkeymap\fP
-Use
-.I keymap
-as the keymap to be affected by the subsequent bindings.
-Acceptable
-.I keymap
-names are
-\fIemacs, emacs\-standard, emacs\-meta, emacs\-ctlx, vi,
-vi\-move, vi\-command\fP, and
-.IR vi\-insert .
-\fIvi\fP is equivalent to \fIvi\-command\fP; \fIemacs\fP is
-equivalent to \fIemacs\-standard\fP.
-.TP
-.B \-l
-List the names of all \fBreadline\fP functions.
-.TP
-.B \-p
-Display \fBreadline\fP function names and bindings in such a way
-that they can be re-read.
-.TP
-.B \-P
-List current \fBreadline\fP function names and bindings.
-.TP
-.B \-s
-Display \fBreadline\fP key sequences bound to macros and the strings
-they output in such a way that they can be re-read.
-.TP
-.B \-S
-Display \fBreadline\fP key sequences bound to macros and the strings
-they output.
-.TP
-.B \-v
-Display \fBreadline\fP variable names and values in such a way that they
-can be re-read.
-.TP
-.B \-V
-List current \fBreadline\fP variable names and values.
-.TP
-.B \-f \fIfilename\fP
-Read key bindings from \fIfilename\fP.
-.TP
-.B \-q \fIfunction\fP
-Query about which keys invoke the named \fIfunction\fP.
-.TP
-.B \-u \fIfunction\fP
-Unbind all keys bound to the named \fIfunction\fP.
-.TP
-.B \-r \fIkeyseq\fP
-Remove any current binding for \fIkeyseq\fP.
-.TP
-.B \-x \fIkeyseq\fP:\fIshell\-command\fP
-Cause \fIshell\-command\fP to be executed whenever \fIkeyseq\fP is
-entered.
-When \fIshell\-command\fP is executed, the shell sets the
-.SM
-.B READLINE_LINE
-variable to the contents of the \fBreadline\fP line buffer and the
-.SM
-.B READLINE_POINT
-variable to the current location of the insertion point.
-If the executed command changes the value of
-.SM
-.B READLINE_LINE
-or
-.SM
-.BR READLINE_POINT ,
-those new values will be reflected in the editing state.
-.TP
-.B \-X
-List all key sequences bound to shell commands and the associated commands
-in a format that can be reused as input.
-.PD
-.PP
-The return value is 0 unless an unrecognized option is given or an
-error occurred.
-.RE
-.TP
-\fBbreak\fP [\fIn\fP]
-Exit from within a
-.BR for ,
-.BR while ,
-.BR until ,
-or
-.B select
-loop. If \fIn\fP is specified, break \fIn\fP levels.
-.I n
-must be \(>= 1. If
-.I n
-is greater than the number of enclosing loops, all enclosing loops
-are exited.
-The return value is 0 unless \fIn\fP is not greater than or equal to 1.
-.TP
-\fBbuiltin\fP \fIshell\-builtin\fP [\fIarguments\fP]
-Execute the specified shell builtin, passing it
-.IR arguments ,
-and return its exit status.
-This is useful when defining a
-function whose name is the same as a shell builtin,
-retaining the functionality of the builtin within the function.
-The \fBcd\fP builtin is commonly redefined this way.
-The return status is false if
-.I shell\-builtin
-is not a shell builtin command.
-.TP
-\fBcaller\fP [\fIexpr\fP]
-Returns the context of any active subroutine call (a shell function or
-a script executed with the \fB.\fP or \fBsource\fP builtins).
-Without \fIexpr\fP, \fBcaller\fP displays the line number and source
-filename of the current subroutine call.
-If a non-negative integer is supplied as \fIexpr\fP, \fBcaller\fP
-displays the line number, subroutine name, and source file corresponding
-to that position in the current execution call stack. This extra
-information may be used, for example, to print a stack trace. The
-current frame is frame 0.
-The return value is 0 unless the shell is not executing a subroutine
-call or \fIexpr\fP does not correspond to a valid position in the
-call stack.
-.TP
-\fBcd\fP [\fB\-L\fP|[\fB\-P\fP [\fB\-e\fP]] [\-@]] [\fIdir\fP]
-Change the current directory to \fIdir\fP.
-if \fIdir\fP is not supplied, the value of the
-.SM
-.B HOME
-shell variable is the default.
-Any additional arguments following \fIdir\fP are ignored.
-The variable
-.SM
-.B CDPATH
-defines the search path for the directory containing
-.IR dir :
-each directory name in
-.SM
-.B CDPATH
-is searched for \fIdir\fP.
-Alternative directory names in
-.SM
-.B CDPATH
-are separated by a colon (:). A null directory name in
-.SM
-.B CDPATH
-is the same as the current directory, i.e., ``\fB.\fP''. If
-.I dir
-begins with a slash (/),
-then
-.SM
-.B CDPATH
-is not used. The
-.B \-P
-option causes \fBcd\fP to use the physical directory structure
-by resolving symbolic links while traversing \fIdir\fP and
-before processing instances of \fI..\fP in \fIdir\fP (see also the
-.B \-P
-option to the
-.B set
-builtin command); the
-.B \-L
-option forces symbolic links to be followed by resolving the link
-after processing instances of \fI..\fP in \fIdir\fP.
-If \fI..\fP appears in \fIdir\fP, it is processed by removing the
-immediately previous pathname component from \fIdir\fP, back to a slash
-or the beginning of \fIdir\fP.
-If the
-.B \-e
-option is supplied with
-.BR \-P ,
-and the current working directory cannot be successfully determined
-after a successful directory change, \fBcd\fP will return an unsuccessful
-status.
-On systems that support it, the \fB\-@\fP option presents the extended
-attributes associated with a file as a directory.
-An argument of
-.B \-
-is converted to
-.SM
-.B $OLDPWD
-before the directory change is attempted.
-If a non-empty directory name from
-.SM
-.B CDPATH
-is used, or if
-\fB\-\fP is the first argument, and the directory change is
-successful, the absolute pathname of the new working directory is
-written to the standard output.
-The return value is true if the directory was successfully changed;
-false otherwise.
-.TP
-\fBcommand\fP [\fB\-pVv\fP] \fIcommand\fP [\fIarg\fP ...]
-Run
-.I command
-with
-.I args
-suppressing the normal shell function lookup. Only builtin
-commands or commands found in the
-.SM
-.B PATH
-are executed. If the
-.B \-p
-option is given, the search for
-.I command
-is performed using a default value for
-.SM
-.B PATH
-that is guaranteed to find all of the standard utilities.
-If either the
-.B \-V
-or
-.B \-v
-option is supplied, a description of
-.I command
-is printed. The
-.B \-v
-option causes a single word indicating the command or filename
-used to invoke
-.I command
-to be displayed; the
-.B \-V
-option produces a more verbose description.
-If the
-.B \-V
-or
-.B \-v
-option is supplied, the exit status is 0 if
-.I command
-was found, and 1 if not. If neither option is supplied and
-an error occurred or
-.I command
-cannot be found, the exit status is 127. Otherwise, the exit status of the
-.B command
-builtin is the exit status of
-.IR command .
-.TP
-\fBcompgen\fP [\fIoption\fP] [\fIword\fP]
-Generate possible completion matches for \fIword\fP according to
-the \fIoption\fPs, which may be any option accepted by the
-.B complete
-builtin with the exception of \fB\-p\fP and \fB\-r\fP, and write
-the matches to the standard output.
-When using the \fB\-F\fP or \fB\-C\fP options, the various shell variables
-set by the programmable completion facilities, while available, will not
-have useful values.
-.sp 1
-The matches will be generated in the same way as if the programmable
-completion code had generated them directly from a completion specification
-with the same flags.
-If \fIword\fP is specified, only those completions matching \fIword\fP
-will be displayed.
-.sp 1
-The return value is true unless an invalid option is supplied, or no
-matches were generated.
-.TP
-\fBcomplete\fP [\fB\-abcdefgjksuv\fP] [\fB\-o\fP \fIcomp-option\fP] [\fB\-DE\fP] [\fB\-A\fP \fIaction\fP] [\fB\-G\fP \fIglobpat\fP] [\fB\-W\fP \fIwordlist\fP] [\fB\-F\fP \fIfunction\fP] [\fB\-C\fP \fIcommand\fP]
-.br
-[\fB\-X\fP \fIfilterpat\fP] [\fB\-P\fP \fIprefix\fP] [\fB\-S\fP \fIsuffix\fP] \fIname\fP [\fIname ...\fP]
-.PD 0
-.TP
-\fBcomplete\fP \fB\-pr\fP [\fB\-DE\fP] [\fIname\fP ...]
-.PD
-Specify how arguments to each \fIname\fP should be completed.
-If the \fB\-p\fP option is supplied, or if no options are supplied,
-existing completion specifications are printed in a way that allows
-them to be reused as input.
-The \fB\-r\fP option removes a completion specification for
-each \fIname\fP, or, if no \fIname\fPs are supplied, all
-completion specifications.
-The \fB\-D\fP option indicates that the remaining options and actions should
-apply to the ``default'' command completion; that is, completion attempted
-on a command for which no completion has previously been defined.
-The \fB\-E\fP option indicates that the remaining options and actions should
-apply to ``empty'' command completion; that is, completion attempted on a
-blank line.
-.sp 1
-The process of applying these completion specifications when word completion
-is attempted is described above under \fBProgrammable Completion\fP.
-.sp 1
-Other options, if specified, have the following meanings.
-The arguments to the \fB\-G\fP, \fB\-W\fP, and \fB\-X\fP options
-(and, if necessary, the \fB\-P\fP and \fB\-S\fP options)
-should be quoted to protect them from expansion before the
-.B complete
-builtin is invoked.
-.RS
-.PD 0
-.TP 8
-\fB\-o\fP \fIcomp-option\fP
-The \fIcomp-option\fP controls several aspects of the compspec's behavior
-beyond the simple generation of completions.
-\fIcomp-option\fP may be one of:
-.RS
-.TP 8
-.B bashdefault
-Perform the rest of the default \fBbash\fP completions if the compspec
-generates no matches.
-.TP 8
-.B default
-Use readline's default filename completion if the compspec generates
-no matches.
-.TP 8
-.B dirnames
-Perform directory name completion if the compspec generates no matches.
-.TP 8
-.B filenames
-Tell readline that the compspec generates filenames, so it can perform any
-filename\-specific processing (like adding a slash to directory names,
-quoting special characters, or suppressing trailing spaces).
-Intended to be used with shell functions.
-.TP 8
-.B noquote
-Tell readline not to quote the completed words if they are filenames
-(quoting filenames is the default).
-.TP 8
-.B nospace
-Tell readline not to append a space (the default) to words completed at
-the end of the line.
-.TP 8
-.B plusdirs
-After any matches defined by the compspec are generated,
-directory name completion is attempted and any
-matches are added to the results of the other actions.
-.RE
-.TP 8
-\fB\-A\fP \fIaction\fP
-The \fIaction\fP may be one of the following to generate a list of possible
-completions:
-.RS
-.TP 8
-.B alias
-Alias names. May also be specified as \fB\-a\fP.
-.TP 8
-.B arrayvar
-Array variable names.
-.TP 8
-.B binding
-\fBReadline\fP key binding names.
-.TP 8
-.B builtin
-Names of shell builtin commands. May also be specified as \fB\-b\fP.
-.TP 8
-.B command
-Command names. May also be specified as \fB\-c\fP.
-.TP 8
-.B directory
-Directory names. May also be specified as \fB\-d\fP.
-.TP 8
-.B disabled
-Names of disabled shell builtins.
-.TP 8
-.B enabled
-Names of enabled shell builtins.
-.TP 8
-.B export
-Names of exported shell variables. May also be specified as \fB\-e\fP.
-.TP 8
-.B file
-File names. May also be specified as \fB\-f\fP.
-.TP 8
-.B function
-Names of shell functions.
-.TP 8
-.B group
-Group names. May also be specified as \fB\-g\fP.
-.TP 8
-.B helptopic
-Help topics as accepted by the \fBhelp\fP builtin.
-.TP 8
-.B hostname
-Hostnames, as taken from the file specified by the
-.SM
-.B HOSTFILE
-shell variable.
-.TP 8
-.B job
-Job names, if job control is active. May also be specified as \fB\-j\fP.
-.TP 8
-.B keyword
-Shell reserved words. May also be specified as \fB\-k\fP.
-.TP 8
-.B running
-Names of running jobs, if job control is active.
-.TP 8
-.B service
-Service names. May also be specified as \fB\-s\fP.
-.TP 8
-.B setopt
-Valid arguments for the \fB\-o\fP option to the \fBset\fP builtin.
-.TP 8
-.B shopt
-Shell option names as accepted by the \fBshopt\fP builtin.
-.TP 8
-.B signal
-Signal names.
-.TP 8
-.B stopped
-Names of stopped jobs, if job control is active.
-.TP 8
-.B user
-User names. May also be specified as \fB\-u\fP.
-.TP 8
-.B variable
-Names of all shell variables. May also be specified as \fB\-v\fP.
-.RE
-.TP 8
-\fB\-C\fP \fIcommand\fP
-\fIcommand\fP is executed in a subshell environment, and its output is
-used as the possible completions.
-.TP 8
-\fB\-F\fP \fIfunction\fP
-The shell function \fIfunction\fP is executed in the current shell
-environment.
-When the function is executed,
-the first argument (\fB$1\fP) is the name of the command whose arguments are
-being completed,
-the second argument (\fB$2\fP) is the word being completed,
-and the third argument (\fB$3\fP) is the word preceding the word being
-completed on the current command line.
-When it finishes, the possible completions are retrieved from the value
-of the
-.SM
-.B COMPREPLY
-array variable.
-.TP 8
-\fB\-G\fP \fIglobpat\fP
-The pathname expansion pattern \fIglobpat\fP is expanded to generate
-the possible completions.
-.TP 8
-\fB\-P\fP \fIprefix\fP
-\fIprefix\fP is added at the beginning of each possible completion
-after all other options have been applied.
-.TP 8
-\fB\-S\fP \fIsuffix\fP
-\fIsuffix\fP is appended to each possible completion
-after all other options have been applied.
-.TP 8
-\fB\-W\fP \fIwordlist\fP
-The \fIwordlist\fP is split using the characters in the
-.SM
-.B IFS
-special variable as delimiters, and each resultant word is expanded.
-The possible completions are the members of the resultant list which
-match the word being completed.
-.TP 8
-\fB\-X\fP \fIfilterpat\fP
-\fIfilterpat\fP is a pattern as used for pathname expansion.
-It is applied to the list of possible completions generated by the
-preceding options and arguments, and each completion matching
-\fIfilterpat\fP is removed from the list.
-A leading \fB!\fP in \fIfilterpat\fP negates the pattern; in this
-case, any completion not matching \fIfilterpat\fP is removed.
-.PD
-.PP
-The return value is true unless an invalid option is supplied, an option
-other than \fB\-p\fP or \fB\-r\fP is supplied without a \fIname\fP
-argument, an attempt is made to remove a completion specification for
-a \fIname\fP for which no specification exists, or
-an error occurs adding a completion specification.
-.RE
-.TP
-\fBcompopt\fP [\fB\-o\fP \fIoption\fP] [\fB\-DE\fP] [\fB+o\fP \fIoption\fP] [\fIname\fP]
-Modify completion options for each \fIname\fP according to the
-\fIoption\fPs, or for the
-currently-executing completion if no \fIname\fPs are supplied.
-If no \fIoption\fPs are given, display the completion options for each
-\fIname\fP or the current completion.
-The possible values of \fIoption\fP are those valid for the \fBcomplete\fP
-builtin described above.
-The \fB\-D\fP option indicates that the remaining options should
-apply to the ``default'' command completion; that is, completion attempted
-on a command for which no completion has previously been defined.
-The \fB\-E\fP option indicates that the remaining options should
-apply to ``empty'' command completion; that is, completion attempted on a
-blank line.
-.sp 1
-The return value is true unless an invalid option is supplied, an attempt
-is made to modify the options for a \fIname\fP for which no completion
-specification exists, or an output error occurs.
-.TP
-\fBcontinue\fP [\fIn\fP]
-Resume the next iteration of the enclosing
-.BR for ,
-.BR while ,
-.BR until ,
-or
-.B select
-loop.
-If
-.I n
-is specified, resume at the \fIn\fPth enclosing loop.
-.I n
-must be \(>= 1. If
-.I n
-is greater than the number of enclosing loops, the last enclosing loop
-(the ``top-level'' loop) is resumed.
-The return value is 0 unless \fIn\fP is not greater than or equal to 1.
-.TP
-\fBdeclare\fP [\fB\-aAfFgilnrtux\fP] [\fB\-p\fP] [\fIname\fP[=\fIvalue\fP] ...]
-.PD 0
-.TP
-\fBtypeset\fP [\fB\-aAfFgilnrtux\fP] [\fB\-p\fP] [\fIname\fP[=\fIvalue\fP] ...]
-.PD
-Declare variables and/or give them attributes.
-If no \fIname\fPs are given then display the values of variables.
-The
-.B \-p
-option will display the attributes and values of each
-.IR name .
-When
-.B \-p
-is used with \fIname\fP arguments, additional options,
-other than \fB\-f\fP and \fB\-F\fP, are ignored.
-When
-.B \-p
-is supplied without \fIname\fP arguments, it will display the attributes
-and values of all variables having the attributes specified by the
-additional options.
-If no other options are supplied with \fB\-p\fP, \fBdeclare\fP will display
-the attributes and values of all shell variables. The \fB\-f\fP option
-will restrict the display to shell functions.
-The
-.B \-F
-option inhibits the display of function definitions; only the
-function name and attributes are printed.
-If the \fBextdebug\fP shell option is enabled using \fBshopt\fP,
-the source file name and line number where the function is defined
-are displayed as well. The
-.B \-F
-option implies
-.BR \-f .
-The
-.B \-g
-option forces variables to be created or modified at the global scope,
-even when \fBdeclare\fP is executed in a shell function.
-It is ignored in all other cases.
-The following options can
-be used to restrict output to variables with the specified attribute or
-to give variables attributes:
-.RS
-.PD 0
-.TP
-.B \-a
-Each \fIname\fP is an indexed array variable (see
-.B Arrays
-above).
-.TP
-.B \-A
-Each \fIname\fP is an associative array variable (see
-.B Arrays
-above).
-.TP
-.B \-f
-Use function names only.
-.TP
-.B \-i
-The variable is treated as an integer; arithmetic evaluation (see
-.SM
-.B "ARITHMETIC EVALUATION"
-above) is performed when the variable is assigned a value.
-.TP
-.B \-l
-When the variable is assigned a value, all upper-case characters are
-converted to lower-case.
-The upper-case attribute is disabled.
-.TP
-.B \-n
-Give each \fIname\fP the \fInameref\fP attribute, making
-it a name reference to another variable.
-That other variable is defined by the value of \fIname\fP.
-All references, assignments, and attribute modifications
-to \fIname\fP, except for changing the
-\fB\-n\fP attribute itself, are performed on the variable referenced by
-\fIname\fP's value.
-The nameref attribute cannot be applied to array variables.
-.TP
-.B \-r
-Make \fIname\fPs readonly. These names cannot then be assigned values
-by subsequent assignment statements or unset.
-.TP
-.B \-t
-Give each \fIname\fP the \fItrace\fP attribute.
-Traced functions inherit the \fBDEBUG\fP and \fBRETURN\fP traps from
-the calling shell.
-The trace attribute has no special meaning for variables.
-.TP
-.B \-u
-When the variable is assigned a value, all lower-case characters are
-converted to upper-case.
-The lower-case attribute is disabled.
-.TP
-.B \-x
-Mark \fIname\fPs for export to subsequent commands via the environment.
-.PD
-.PP
-Using `+' instead of `\-'
-turns off the attribute instead,
-with the exceptions that \fB+a\fP
-may not be used to destroy an array variable and \fB+r\fP will not
-remove the readonly attribute.
-When used in a function,
-.B declare
-and
-.B typeset
-make each
-\fIname\fP local, as with the
-.B local
-command,
-unless the \fB\-g\fP option is supplied.
-If a variable name is followed by =\fIvalue\fP, the value of
-the variable is set to \fIvalue\fP.
-When using \fB\-a\fP or \fB\-A\fP and the compound assignment syntax to
-create array variables, additional attributes do not take effect until
-subsequent assignments.
-The return value is 0 unless an invalid option is encountered,
-an attempt is made to define a function using
-.if n ``\-f foo=bar'',
-.if t \f(CW\-f foo=bar\fP,
-an attempt is made to assign a value to a readonly variable,
-an attempt is made to assign a value to an array variable without
-using the compound assignment syntax (see
-.B Arrays
-above), one of the \fInames\fP is not a valid shell variable name,
-an attempt is made to turn off readonly status for a readonly variable,
-an attempt is made to turn off array status for an array variable,
-or an attempt is made to display a non-existent function with \fB\-f\fP.
-.RE
-.TP
-.B dirs [\fB\-clpv\fP] [+\fIn\fP] [\-\fIn\fP]
-Without options, displays the list of currently remembered directories.
-The default display is on a single line with directory names separated
-by spaces.
-Directories are added to the list with the
-.B pushd
-command; the
-.B popd
-command removes entries from the list.
-.RS
-.PD 0
-.TP
-.B \-c
-Clears the directory stack by deleting all of the entries.
-.TP
-.B \-l
-Produces a listing using full pathnames;
-the default listing format uses a tilde to denote the home directory.
-.TP
-.B \-p
-Print the directory stack with one entry per line.
-.TP
-.B \-v
-Print the directory stack with one entry per line,
-prefixing each entry with its index in the stack.
-.TP
-\fB+\fP\fIn\fP
-Displays the \fIn\fPth entry counting from the left of the list
-shown by
-.B dirs
-when invoked without options, starting with zero.
-.TP
-\fB\-\fP\fIn\fP
-Displays the \fIn\fPth entry counting from the right of the list
-shown by
-.B dirs
-when invoked without options, starting with zero.
-.PD
-.PP
-The return value is 0 unless an
-invalid option is supplied or \fIn\fP indexes beyond the end
-of the directory stack.
-.RE
-.TP
-\fBdisown\fP [\fB\-ar\fP] [\fB\-h\fP] [\fIjobspec\fP ...]
-Without options, remove each
-.I jobspec
-from the table of active jobs.
-If
-.I jobspec
-is not present, and neither the \fB\-a\fP nor the \fB\-r\fP option
-is supplied, the \fIcurrent job\fP is used.
-If the \fB\-h\fP option is given, each
-.I jobspec
-is not removed from the table, but is marked so that
-.SM
-.B SIGHUP
-is not sent to the job if the shell receives a
-.SM
-.BR SIGHUP .
-If no
-.I jobspec
-is supplied, the
-.B \-a
-option means to remove or mark all jobs; the
-.B \-r
-option without a
-.I jobspec
-argument restricts operation to running jobs.
-The return value is 0 unless a
-.I jobspec
-does not specify a valid job.
-.TP
-\fBecho\fP [\fB\-neE\fP] [\fIarg\fP ...]
-Output the \fIarg\fPs, separated by spaces, followed by a newline.
-The return status is 0 unless a write error occurs.
-If \fB\-n\fP is specified, the trailing newline is
-suppressed. If the \fB\-e\fP option is given, interpretation of
-the following backslash-escaped characters is enabled. The
-.B \-E
-option disables the interpretation of these escape characters,
-even on systems where they are interpreted by default.
-The \fBxpg_echo\fP shell option may be used to
-dynamically determine whether or not \fBecho\fP expands these
-escape characters by default.
-.B echo
-does not interpret \fB\-\-\fP to mean the end of options.
-.B echo
-interprets the following escape sequences:
-.RS
-.PD 0
-.TP
-.B \ea
-alert (bell)
-.TP
-.B \eb
-backspace
-.TP
-.B \ec
-suppress further output
-.TP
-.B \ee
-.TP
-.B \eE
-an escape character
-.TP
-.B \ef
-form feed
-.TP
-.B \en
-new line
-.TP
-.B \er
-carriage return
-.TP
-.B \et
-horizontal tab
-.TP
-.B \ev
-vertical tab
-.TP
-.B \e\e
-backslash
-.TP
-.B \e0\fInnn\fP
-the eight-bit character whose value is the octal value \fInnn\fP
-(zero to three octal digits)
-.TP
-.B \ex\fIHH\fP
-the eight-bit character whose value is the hexadecimal value \fIHH\fP
-(one or two hex digits)
-.TP
-.B \eu\fIHHHH\fP
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-\fIHHHH\fP (one to four hex digits)
-.TP
-.B \eU\fIHHHHHHHH\fP
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-\fIHHHHHHHH\fP (one to eight hex digits)
-.PD
-.RE
-.TP
-\fBenable\fP [\fB\-a\fP] [\fB\-dnps\fP] [\fB\-f\fP \fIfilename\fP] [\fIname\fP ...]
-Enable and disable builtin shell commands.
-Disabling a builtin allows a disk command which has the same name
-as a shell builtin to be executed without specifying a full pathname,
-even though the shell normally searches for builtins before disk commands.
-If \fB\-n\fP is used, each \fIname\fP
-is disabled; otherwise,
-\fInames\fP are enabled. For example, to use the
-.B test
-binary found via the
-.SM
-.B PATH
-instead of the shell builtin version, run
-.if t \f(CWenable -n test\fP.
-.if n ``enable -n test''.
-The
-.B \-f
-option means to load the new builtin command
-.I name
-from shared object
-.IR filename ,
-on systems that support dynamic loading. The
-.B \-d
-option will delete a builtin previously loaded with
-.BR \-f .
-If no \fIname\fP arguments are given, or if the
-.B \-p
-option is supplied, a list of shell builtins is printed.
-With no other option arguments, the list consists of all enabled
-shell builtins.
-If \fB\-n\fP is supplied, only disabled builtins are printed.
-If \fB\-a\fP is supplied, the list printed includes all builtins, with an
-indication of whether or not each is enabled.
-If \fB\-s\fP is supplied, the output is restricted to the POSIX
-\fIspecial\fP builtins.
-The return value is 0 unless a
-.I name
-is not a shell builtin or there is an error loading a new builtin
-from a shared object.
-.TP
-\fBeval\fP [\fIarg\fP ...]
-The \fIarg\fPs are read and concatenated together into a single
-command. This command is then read and executed by the shell, and
-its exit status is returned as the value of
-.BR eval .
-If there are no
-.IR args ,
-or only null arguments,
-.B eval
-returns 0.
-.TP
-\fBexec\fP [\fB\-cl\fP] [\fB\-a\fP \fIname\fP] [\fIcommand\fP [\fIarguments\fP]]
-If
-.I command
-is specified, it replaces the shell.
-No new process is created. The
-.I arguments
-become the arguments to \fIcommand\fP.
-If the
-.B \-l
-option is supplied,
-the shell places a dash at the beginning of the zeroth argument passed to
-.IR command .
-This is what
-.IR login (1)
-does. The
-.B \-c
-option causes
-.I command
-to be executed with an empty environment. If
-.B \-a
-is supplied, the shell passes
-.I name
-as the zeroth argument to the executed command.
-If
-.I command
-cannot be executed for some reason, a non-interactive shell exits,
-unless the
-.B execfail
-shell option
-is enabled. In that case, it returns failure.
-An interactive shell returns failure if the file cannot be executed.
-If
-.I command
-is not specified, any redirections take effect in the current shell,
-and the return status is 0. If there is a redirection error, the
-return status is 1.
-.TP
-\fBexit\fP [\fIn\fP]
-Cause the shell to exit
-with a status of \fIn\fP. If
-.I n
-is omitted, the exit status
-is that of the last command executed.
-A trap on
-.SM
-.B EXIT
-is executed before the shell terminates.
-.TP
-\fBexport\fP [\fB\-fn\fP\^] [\fIname\fP[=\fIword\fP]] ...
-.PD 0
-.TP
-.B export \-p
-.PD
-The supplied
-.I names
-are marked for automatic export to the environment of
-subsequently executed commands. If the
-.B \-f
-option is given,
-the
-.I names
-refer to functions.
-If no
-.I names
-are given, or if the
-.B \-p
-option is supplied, a list
-of names of all exported variables is printed.
-The
-.B \-n
-option causes the export property to be removed from each
-\fIname\fP.
-If a variable name is followed by =\fIword\fP, the value of
-the variable is set to \fIword\fP.
-.B export
-returns an exit status of 0 unless an invalid option is
-encountered,
-one of the \fInames\fP is not a valid shell variable name, or
-.B \-f
-is supplied with a
-.I name
-that is not a function.
-.TP
-\fBfc\fP [\fB\-e\fP \fIename\fP] [\fB\-lnr\fP] [\fIfirst\fP] [\fIlast\fP]
-.PD 0
-.TP
-\fBfc\fP \fB\-s\fP [\fIpat\fP=\fIrep\fP] [\fIcmd\fP]
-.PD
-The first form selects a range of commands from
-.I first
-to
-.I last
-from the history list and displays or edits and re-executes them.
-.I First
-and
-.I last
-may be specified as a string (to locate the last command beginning
-with that string) or as a number (an index into the history list,
-where a negative number is used as an offset from the current
-command number). If
-.I last
-is not specified it is set to
-the current command for listing (so that
-.if n ``fc \-l \-10''
-.if t \f(CWfc \-l \-10\fP
-prints the last 10 commands) and to
-.I first
-otherwise.
-If
-.I first
-is not specified it is set to the previous
-command for editing and \-16 for listing.
-.sp 1
-The
-.B \-n
-option suppresses
-the command numbers when listing. The
-.B \-r
-option reverses the order of
-the commands. If the
-.B \-l
-option is given,
-the commands are listed on
-standard output. Otherwise, the editor given by
-.I ename
-is invoked
-on a file containing those commands. If
-.I ename
-is not given, the
-value of the
-.SM
-.B FCEDIT
-variable is used, and
-the value of
-.SM
-.B EDITOR
-if
-.SM
-.B FCEDIT
-is not set. If neither variable is set,
-.FN vi
-is used. When editing is complete, the edited commands are
-echoed and executed.
-.sp 1
-In the second form, \fIcommand\fP is re-executed after each instance
-of \fIpat\fP is replaced by \fIrep\fP.
-\fICommand\fP is intepreted the same as \fIfirst\fP above.
-A useful alias to use with this is
-.if n ``r="fc -s"'',
-.if t \f(CWr='fc \-s'\fP,
-so that typing
-.if n ``r cc''
-.if t \f(CWr cc\fP
-runs the last command beginning with
-.if n ``cc''
-.if t \f(CWcc\fP
-and typing
-.if n ``r''
-.if t \f(CWr\fP
-re-executes the last command.
-.sp 1
-If the first form is used, the return value is 0 unless an invalid
-option is encountered or
-.I first
-or
-.I last
-specify history lines out of range.
-If the
-.B \-e
-option is supplied, the return value is the value of the last
-command executed or failure if an error occurs with the temporary
-file of commands. If the second form is used, the return status
-is that of the command re-executed, unless
-.I cmd
-does not specify a valid history line, in which case
-.B fc
-returns failure.
-.TP
-\fBfg\fP [\fIjobspec\fP]
-Resume
-.I jobspec
-in the foreground, and make it the current job.
-If
-.I jobspec
-is not present, the shell's notion of the \fIcurrent job\fP is used.
-The return value is that of the command placed into the foreground,
-or failure if run when job control is disabled or, when run with
-job control enabled, if
-.I jobspec
-does not specify a valid job or
-.I jobspec
-specifies a job that was started without job control.
-.TP
-\fBgetopts\fP \fIoptstring\fP \fIname\fP [\fIargs\fP]
-.B getopts
-is used by shell procedures to parse positional parameters.
-.I optstring
-contains the option characters to be recognized; if a character
-is followed by a colon, the option is expected to have an
-argument, which should be separated from it by white space.
-The colon and question mark characters may not be used as
-option characters.
-Each time it is invoked,
-.B getopts
-places the next option in the shell variable
-.IR name ,
-initializing
-.I name
-if it does not exist,
-and the index of the next argument to be processed into the
-variable
-.SM
-.BR OPTIND .
-.SM
-.B OPTIND
-is initialized to 1 each time the shell or a shell script
-is invoked. When an option requires an argument,
-.B getopts
-places that argument into the variable
-.SM
-.BR OPTARG .
-The shell does not reset
-.SM
-.B OPTIND
-automatically; it must be manually reset between multiple
-calls to
-.B getopts
-within the same shell invocation if a new set of parameters
-is to be used.
-.sp 1
-When the end of options is encountered, \fBgetopts\fP exits with a
-return value greater than zero.
-.SM
-.B OPTIND
-is set to the index of the first non-option argument,
-and \fIname\fP is set to ?.
-.sp 1
-.B getopts
-normally parses the positional parameters, but if more arguments are
-given in
-.IR args ,
-.B getopts
-parses those instead.
-.sp 1
-.B getopts
-can report errors in two ways. If the first character of
-.I optstring
-is a colon,
-.I silent
-error reporting is used. In normal operation, diagnostic messages
-are printed when invalid options or missing option arguments are
-encountered.
-If the variable
-.SM
-.B OPTERR
-is set to 0, no error messages will be displayed, even if the first
-character of
-.I optstring
-is not a colon.
-.sp 1
-If an invalid option is seen,
-.B getopts
-places ? into
-.I name
-and, if not silent,
-prints an error message and unsets
-.SM
-.BR OPTARG .
-If
-.B getopts
-is silent,
-the option character found is placed in
-.SM
-.B OPTARG
-and no diagnostic message is printed.
-.sp 1
-If a required argument is not found, and
-.B getopts
-is not silent,
-a question mark (\^\fB?\fP\^) is placed in
-.IR name ,
-.SM
-.B OPTARG
-is unset, and a diagnostic message is printed.
-If
-.B getopts
-is silent, then a colon (\^\fB:\fP\^) is placed in
-.I name
-and
-.SM
-.B OPTARG
-is set to the option character found.
-.sp 1
-.B getopts
-returns true if an option, specified or unspecified, is found.
-It returns false if the end of options is encountered or an
-error occurs.
-.TP
-\fBhash\fP [\fB\-lr\fP] [\fB\-p\fP \fIfilename\fP] [\fB\-dt\fP] [\fIname\fP]
-Each time \fBhash\fP is invoked,
-the full pathname of the command
-.I name
-is determined by searching
-the directories in
-.B $PATH
-and remembered. Any previously-remembered pathname is discarded.
-If the
-.B \-p
-option is supplied, no path search is performed, and
-.I filename
-is used as the full filename of the command.
-The
-.B \-r
-option causes the shell to forget all
-remembered locations.
-The
-.B \-d
-option causes the shell to forget the remembered location of each \fIname\fP.
-If the
-.B \-t
-option is supplied, the full pathname to which each \fIname\fP corresponds
-is printed. If multiple \fIname\fP arguments are supplied with \fB\-t\fP,
-the \fIname\fP is printed before the hashed full pathname.
-The
-.B \-l
-option causes output to be displayed in a format that may be reused as input.
-If no arguments are given, or if only \fB\-l\fP is supplied,
-information about remembered commands is printed.
-The return status is true unless a
-.I name
-is not found or an invalid option is supplied.
-.TP
-\fBhelp\fP [\fB\-dms\fP] [\fIpattern\fP]
-Display helpful information about builtin commands. If
-.I pattern
-is specified,
-.B help
-gives detailed help on all commands matching
-.IR pattern ;
-otherwise help for all the builtins and shell control structures
-is printed.
-.RS
-.PD 0
-.TP
-.B \-d
-Display a short description of each \fIpattern\fP
-.TP
-.B \-m
-Display the description of each \fIpattern\fP in a manpage-like format
-.TP
-.B \-s
-Display only a short usage synopsis for each \fIpattern\fP
-.PD
-.PP
-The return status is 0 unless no command matches
-.IR pattern .
-.RE
-.TP
-\fBhistory [\fIn\fP]
-.PD 0
-.TP
-\fBhistory\fP \fB\-c\fP
-.TP
-\fBhistory \-d\fP \fIoffset\fP
-.TP
-\fBhistory\fP \fB\-anrw\fP [\fIfilename\fP]
-.TP
-\fBhistory\fP \fB\-p\fP \fIarg\fP [\fIarg ...\fP]
-.TP
-\fBhistory\fP \fB\-s\fP \fIarg\fP [\fIarg ...\fP]
-.PD
-With no options, display the command
-history list with line numbers. Lines listed
-with a
-.B *
-have been modified. An argument of
-.I n
-lists only the last
-.I n
-lines.
-If the shell variable
-.SM
-.B HISTTIMEFORMAT
-is set and not null,
-it is used as a format string for \fIstrftime\fP(3) to display
-the time stamp associated with each displayed history entry.
-No intervening blank is printed between the formatted time stamp
-and the history line.
-If \fIfilename\fP is supplied, it is used as the
-name of the history file; if not, the value of
-.SM
-.B HISTFILE
-is used. Options, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-c
-Clear the history list by deleting all the entries.
-.TP
-\fB\-d\fP \fIoffset\fP
-Delete the history entry at position \fIoffset\fP.
-.TP
-.B \-a
-Append the ``new'' history lines (history lines entered since the
-beginning of the current \fBbash\fP session) to the history file.
-.TP
-.B \-n
-Read the history lines not already read from the history
-file into the current history list. These are lines
-appended to the history file since the beginning of the
-current \fBbash\fP session.
-.TP
-.B \-r
-Read the contents of the history file
-and append them to the current history list.
-.TP
-.B \-w
-Write the current history list to the history file, overwriting the
-history file's contents.
-.TP
-.B \-p
-Perform history substitution on the following \fIargs\fP and display
-the result on the standard output.
-Does not store the results in the history list.
-Each \fIarg\fP must be quoted to disable normal history expansion.
-.TP
-.B \-s
-Store the
-.I args
-in the history list as a single entry. The last command in the
-history list is removed before the
-.I args
-are added.
-.PD
-.PP
-If the
-.SM
-.B HISTTIMEFORMAT
-variable is set, the time stamp information
-associated with each history entry is written to the history file,
-marked with the history comment character.
-When the history file is read, lines beginning with the history
-comment character followed immediately by a digit are interpreted
-as timestamps for the previous history line.
-The return value is 0 unless an invalid option is encountered, an
-error occurs while reading or writing the history file, an invalid
-\fIoffset\fP is supplied as an argument to \fB\-d\fP, or the
-history expansion supplied as an argument to \fB\-p\fP fails.
-.RE
-.TP
-\fBjobs\fP [\fB\-lnprs\fP] [ \fIjobspec\fP ... ]
-.PD 0
-.TP
-\fBjobs\fP \fB\-x\fP \fIcommand\fP [ \fIargs\fP ... ]
-.PD
-The first form lists the active jobs. The options have the following
-meanings:
-.RS
-.PD 0
-.TP
-.B \-l
-List process IDs
-in addition to the normal information.
-.TP
-.B \-n
-Display information only about jobs that have changed status since
-the user was last notified of their status.
-.TP
-.B \-p
-List only the process ID of the job's process group
-leader.
-.TP
-.B \-r
-Display only running jobs.
-.TP
-.B \-s
-Display only stopped jobs.
-.PD
-.PP
-If
-.I jobspec
-is given, output is restricted to information about that job.
-The return status is 0 unless an invalid option is encountered
-or an invalid
-.I jobspec
-is supplied.
-.PP
-If the
-.B \-x
-option is supplied,
-.B jobs
-replaces any
-.I jobspec
-found in
-.I command
-or
-.I args
-with the corresponding process group ID, and executes
-.I command
-passing it
-.IR args ,
-returning its exit status.
-.RE
-.TP
-\fBkill\fP [\fB\-s\fP \fIsigspec\fP | \fB\-n\fP \fIsignum\fP | \fB\-\fP\fIsigspec\fP] [\fIpid\fP | \fIjobspec\fP] ...
-.PD 0
-.TP
-\fBkill\fP \fB\-l\fP [\fIsigspec\fP | \fIexit_status\fP]
-.PD
-Send the signal named by
-.I sigspec
-or
-.I signum
-to the processes named by
-.I pid
-or
-.IR jobspec .
-.I sigspec
-is either a case-insensitive signal name such as
-.SM
-.B SIGKILL
-(with or without the
-.SM
-.B SIG
-prefix) or a signal number;
-.I signum
-is a signal number.
-If
-.I sigspec
-is not present, then
-.SM
-.B SIGTERM
-is assumed.
-An argument of
-.B \-l
-lists the signal names.
-If any arguments are supplied when
-.B \-l
-is given, the names of the signals corresponding to the arguments are
-listed, and the return status is 0.
-The \fIexit_status\fP argument to
-.B \-l
-is a number specifying either a signal number or the exit status of
-a process terminated by a signal.
-.B kill
-returns true if at least one signal was successfully sent, or false
-if an error occurs or an invalid option is encountered.
-.TP
-\fBlet\fP \fIarg\fP [\fIarg\fP ...]
-Each
-.I arg
-is an arithmetic expression to be evaluated (see
-.SM
-.B "ARITHMETIC EVALUATION"
-above).
-If the last
-.I arg
-evaluates to 0,
-.B let
-returns 1; 0 is returned otherwise.
-.TP
-\fBlocal\fP [\fIoption\fP] [\fIname\fP[=\fIvalue\fP] ...]
-For each argument, a local variable named
-.I name
-is created, and assigned
-.IR value .
-The \fIoption\fP can be any of the options accepted by \fBdeclare\fP.
-When
-.B local
-is used within a function, it causes the variable
-.I name
-to have a visible scope restricted to that function and its children.
-With no operands,
-.B local
-writes a list of local variables to the standard output. It is
-an error to use
-.B local
-when not within a function. The return status is 0 unless
-.B local
-is used outside a function, an invalid
-.I name
-is supplied, or
-\fIname\fP is a readonly variable.
-.TP
-.B logout
-Exit a login shell.
-.TP
-\fBmapfile\fP [\fB\-d\fP \fIdelim\fP] [\fB\-n\fP \fIcount\fP] [\fB\-O\fP \fIorigin\fP] [\fB\-s\fP \fIcount\fP] [\fB\-t\fP] [\fB\-u\fP \fIfd\fP] [\fB\-C\fP \fIcallback\fP] [\fB\-c\fP \fIquantum\fP] [\fIarray\fP]
-.PD 0
-.TP
-\fBreadarray\fP [\fB\-d\fP \fIdelim\fP] [\fB\-n\fP \fIcount\fP] [\fB\-O\fP \fIorigin\fP] [\fB\-s\fP \fIcount\fP] [\fB\-t\fP] [\fB\-u\fP \fIfd\fP] [\fB\-C\fP \fIcallback\fP] [\fB\-c\fP \fIquantum\fP] [\fIarray\fP]
-.PD
-Read lines from the standard input into the indexed array variable
-.IR array ,
-or from file descriptor
-.IR fd
-if the
-.B \-u
-option is supplied.
-The variable
-.SM
-.B MAPFILE
-is the default \fIarray\fP.
-Options, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-d
-The first character of \fIdelim\fP is used to terminate each input line,
-rather than newline.
-.TP
-.B \-n
-Copy at most
-.I count
-lines. If \fIcount\fP is 0, all lines are copied.
-.TP
-.B \-O
-Begin assigning to
-.I array
-at index
-.IR origin .
-The default index is 0.
-.TP
-.B \-s
-Discard the first \fIcount\fP lines read.
-.TP
-.B \-t
-Remove a trailing newline from each line read.
-.TP
-.B \-u
-Read lines from file descriptor \fIfd\fP instead of the standard input.
-.TP
-.B \-C
-Evaluate
-.I callback
-each time \fIquantum\fP lines are read. The \fB\-c\fP option specifies
-.IR quantum .
-.TP
-.B \-c
-Specify the number of lines read between each call to
-.IR callback .
-.PD
-.PP
-If
-.B \-C
-is specified without
-.BR \-c ,
-the default quantum is 5000.
-When \fIcallback\fP is evaluated, it is supplied the index of the next
-array element to be assigned and the line to be assigned to that element
-as additional arguments.
-\fIcallback\fP is evaluated after the line is read but before the
-array element is assigned.
-.PP
-If not supplied with an explicit origin, \fBmapfile\fP will clear \fIarray\fP
-before assigning to it.
-.PP
-\fBmapfile\fP returns successfully unless an invalid option or option
-argument is supplied, \fIarray\fP is invalid or unassignable, or if
-\fIarray\fP is not an indexed array.
-.RE
-.TP
-\fBpopd\fP [\-\fBn\fP] [+\fIn\fP] [\-\fIn\fP]
-Removes entries from the directory stack. With no arguments,
-removes the top directory from the stack, and performs a
-.B cd
-to the new top directory.
-Arguments, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-n
-Suppresses the normal change of directory when removing directories
-from the stack, so that only the stack is manipulated.
-.TP
-\fB+\fP\fIn\fP
-Removes the \fIn\fPth entry counting from the left of the list
-shown by
-.BR dirs ,
-starting with zero. For example:
-.if n ``popd +0''
-.if t \f(CWpopd +0\fP
-removes the first directory,
-.if n ``popd +1''
-.if t \f(CWpopd +1\fP
-the second.
-.TP
-\fB\-\fP\fIn\fP
-Removes the \fIn\fPth entry counting from the right of the list
-shown by
-.BR dirs ,
-starting with zero. For example:
-.if n ``popd -0''
-.if t \f(CWpopd -0\fP
-removes the last directory,
-.if n ``popd -1''
-.if t \f(CWpopd -1\fP
-the next to last.
-.PD
-.PP
-If the
-.B popd
-command is successful, a
-.B dirs
-is performed as well, and the return status is 0.
-.B popd
-returns false if an invalid option is encountered, the directory stack
-is empty, a non-existent directory stack entry is specified, or the
-directory change fails.
-.RE
-.TP
-\fBprintf\fP [\fB\-v\fP \fIvar\fP] \fIformat\fP [\fIarguments\fP]
-Write the formatted \fIarguments\fP to the standard output under the
-control of the \fIformat\fP.
-The \fB\-v\fP option causes the output to be assigned to the variable
-\fIvar\fP rather than being printed to the standard output.
-.sp 1
-The \fIformat\fP is a character string which contains three types of objects:
-plain characters, which are simply copied to standard output, character
-escape sequences, which are converted and copied to the standard output, and
-format specifications, each of which causes printing of the next successive
-\fIargument\fP.
-In addition to the standard \fIprintf\fP(1) format specifications,
-\fBprintf\fP interprets the following extensions:
-.RS
-.PD 0
-.TP
-.B %b
-causes
-\fBprintf\fP to expand backslash escape sequences in the corresponding
-\fIargument\fP (except that \fB\ec\fP terminates output, backslashes in
-\fB\e\(aq\fP, \fB\e"\fP, and \fB\e?\fP are not removed, and octal escapes
-beginning with \fB\e0\fP may contain up to four digits).
-.TP
-.B %q
-causes \fBprintf\fP to output the corresponding
-\fIargument\fP in a format that can be reused as shell input.
-.TP
-.B %(\fIdatefmt\fP)T
-causes \fBprintf\fP to output the date-time string resulting from using
-\fIdatefmt\fP as a format string for \fIstrftime\fP(3).
-The corresponding \fIargument\fP is an integer representing the number of
-seconds since the epoch.
-Two special argument values may be used: -1 represents the current
-time, and -2 represents the time the shell was invoked.
-If no argument is specified, conversion behaves as if -1 had been given.
-This is an exception to the usual \fBprintf\fP behavior.
-.PD
-.PP
-Arguments to non-string format specifiers are treated as C constants,
-except that a leading plus or minus sign is allowed, and if the leading
-character is a single or double quote, the value is the ASCII value of
-the following character.
-.PP
-The \fIformat\fP is reused as necessary to consume all of the \fIarguments\fP.
-If the \fIformat\fP requires more \fIarguments\fP than are supplied, the
-extra format specifications behave as if a zero value or null string, as
-appropriate, had been supplied.
-The return value is zero on success, non-zero on failure.
-.RE
-.TP
-\fBpushd\fP [\fB\-n\fP] [+\fIn\fP] [\-\fIn\fP]
-.PD 0
-.TP
-\fBpushd\fP [\fB\-n\fP] [\fIdir\fP]
-.PD
-Adds a directory to the top of the directory stack, or rotates
-the stack, making the new top of the stack the current working
-directory. With no arguments, exchanges the top two directories
-and returns 0, unless the directory stack is empty.
-Arguments, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-n
-Suppresses the normal change of directory when adding directories
-to the stack, so that only the stack is manipulated.
-.TP
-\fB+\fP\fIn\fP
-Rotates the stack so that the \fIn\fPth directory
-(counting from the left of the list shown by
-.BR dirs ,
-starting with zero)
-is at the top.
-.TP
-\fB\-\fP\fIn\fP
-Rotates the stack so that the \fIn\fPth directory
-(counting from the right of the list shown by
-.BR dirs ,
-starting with zero) is at the top.
-.TP
-.I dir
-Adds
-.I dir
-to the directory stack at the top, making it the
-new current working directory as if it had been supplied as the argument
-to the \fBcd\fP builtin.
-.PD
-.PP
-If the
-.B pushd
-command is successful, a
-.B dirs
-is performed as well.
-If the first form is used,
-.B pushd
-returns 0 unless the cd to
-.I dir
-fails. With the second form,
-.B pushd
-returns 0 unless the directory stack is empty,
-a non-existent directory stack element is specified,
-or the directory change to the specified new current directory
-fails.
-.RE
-.TP
-\fBpwd\fP [\fB\-LP\fP]
-Print the absolute pathname of the current working directory.
-The pathname printed contains no symbolic links if the
-.B \-P
-option is supplied or the
-.B \-o physical
-option to the
-.B set
-builtin command is enabled.
-If the
-.B \-L
-option is used, the pathname printed may contain symbolic links.
-The return status is 0 unless an error occurs while
-reading the name of the current directory or an
-invalid option is supplied.
-.TP
-\fBread\fP [\fB\-ers\fP] [\fB\-a\fP \fIaname\fP] [\fB\-d\fP \fIdelim\fP] [\fB\-i\fP \fItext\fP] [\fB\-n\fP \fInchars\fP] [\fB\-N\fP \fInchars\fP] [\fB\-p\fP \fIprompt\fP] [\fB\-t\fP \fItimeout\fP] [\fB\-u\fP \fIfd\fP] [\fIname\fP ...]
-One line is read from the standard input, or from the file descriptor
-\fIfd\fP supplied as an argument to the \fB\-u\fP option, and the first word
-is assigned to the first
-.IR name ,
-the second word to the second
-.IR name ,
-and so on, with leftover words and their intervening separators assigned
-to the last
-.IR name .
-If there are fewer words read from the input stream than names,
-the remaining names are assigned empty values.
-The characters in
-.SM
-.B IFS
-are used to split the line into words using the same rules the shell
-uses for expansion (described above under \fBWord Splitting\fP).
-The backslash character (\fB\e\fP) may be used to remove any special
-meaning for the next character read and for line continuation.
-Options, if supplied, have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-a \fIaname\fP
-The words are assigned to sequential indices
-of the array variable
-.IR aname ,
-starting at 0.
-.I aname
-is unset before any new values are assigned.
-Other \fIname\fP arguments are ignored.
-.TP
-.B \-d \fIdelim\fP
-The first character of \fIdelim\fP is used to terminate the input line,
-rather than newline.
-.TP
-.B \-e
-If the standard input
-is coming from a terminal,
-.B readline
-(see
-.SM
-.B READLINE
-above) is used to obtain the line.
-Readline uses the current (or default, if line editing was not previously
-active) editing settings.
-.TP
-.B \-i \fItext\fP
-If
-.B readline
-is being used to read the line, \fItext\fP is placed into the editing
-buffer before editing begins.
-.TP
-.B \-n \fInchars\fP
-\fBread\fP returns after reading \fInchars\fP characters rather than
-waiting for a complete line of input, but honor a delimiter if fewer
-than \fInchars\fP characters are read before the delimiter.
-.TP
-.B \-N \fInchars\fP
-\fBread\fP returns after reading exactly \fInchars\fP characters rather
-than waiting for a complete line of input, unless EOF is encountered or
-\fBread\fP times out.
-Delimiter characters encountered in the input are
-not treated specially and do not cause \fBread\fP to return until
-\fInchars\fP characters are read.
-.TP
-.B \-p \fIprompt\fP
-Display \fIprompt\fP on standard error, without a
-trailing newline, before attempting to read any input. The prompt
-is displayed only if input is coming from a terminal.
-.TP
-.B \-r
-Backslash does not act as an escape character.
-The backslash is considered to be part of the line.
-In particular, a backslash-newline pair may not be used as a line
-continuation.
-.TP
-.B \-s
-Silent mode. If input is coming from a terminal, characters are
-not echoed.
-.TP
-.B \-t \fItimeout\fP
-Cause \fBread\fP to time out and return failure if a complete line of
-input (or a specified number of characters)
-is not read within \fItimeout\fP seconds.
-\fItimeout\fP may be a decimal number with a fractional portion following
-the decimal point.
-This option is only effective if \fBread\fP is reading input from a
-terminal, pipe, or other special file; it has no effect when reading
-from regular files.
-If \fBread\fP times out, \fBread\fP saves any partial input read into
-the specified variable \fIname\fP.
-If \fItimeout\fP is 0, \fBread\fP returns immediately, without trying to
-read any data. The exit status is 0 if input is available on
-the specified file descriptor, non-zero otherwise.
-The exit status is greater than 128 if the timeout is exceeded.
-.TP
-.B \-u \fIfd\fP
-Read input from file descriptor \fIfd\fP.
-.PD
-.PP
-If no
-.I names
-are supplied, the line read is assigned to the variable
-.SM
-.BR REPLY .
-The return code is zero, unless end-of-file is encountered, \fBread\fP
-times out (in which case the return code is greater than 128),
-a variable assignment error (such as assigning to a readonly variable) occurs,
-or an invalid file descriptor is supplied as the argument to \fB\-u\fP.
-.RE
-.TP
-\fBreadonly\fP [\fB\-aAf\fP] [\fB\-p\fP] [\fIname\fP[=\fIword\fP] ...]
-.PD
-The given
-\fInames\fP are marked readonly; the values of these
-.I names
-may not be changed by subsequent assignment.
-If the
-.B \-f
-option is supplied, the functions corresponding to the
-\fInames\fP are so
-marked.
-The
-.B \-a
-option restricts the variables to indexed arrays; the
-.B \-A
-option restricts the variables to associative arrays.
-If both options are supplied,
-.B \-A
-takes precedence.
-If no
-.I name
-arguments are given, or if the
-.B \-p
-option is supplied, a list of all readonly names is printed.
-The other options may be used to restrict the output to a subset of
-the set of readonly names.
-The
-.B \-p
-option causes output to be displayed in a format that
-may be reused as input.
-If a variable name is followed by =\fIword\fP, the value of
-the variable is set to \fIword\fP.
-The return status is 0 unless an invalid option is encountered,
-one of the
-.I names
-is not a valid shell variable name, or
-.B \-f
-is supplied with a
-.I name
-that is not a function.
-.TP
-\fBreturn\fP [\fIn\fP]
-Causes a function to stop executing and return the value specified by
-.I n
-to its caller.
-If
-.I n
-is omitted, the return status is that of the last command
-executed in the function body.
-If \fBreturn\fP is executed by a trap handler, the last command used to
-determine the status is the last command executed before the trap handler.
-if \fBreturn\fP is executed during a \fBDEBUG\fP trap, the last command
-used to determine the status is the last command executed by the trap
-handler before \fBreturn\fP was invoked.
-If
-.B return
-is used outside a function,
-but during execution of a script by the
-.B .
-(\fBsource\fP) command, it causes the shell to stop executing
-that script and return either
-.I n
-or the exit status of the last command executed within the
-script as the exit status of the script.
-If \fIn\fP is supplied, the return value is its least significant
-8 bits.
-The return status is non-zero if
-.B return
-is supplied a non-numeric argument, or
-is used outside a
-function and not during execution of a script by \fB.\fP\^ or \fBsource\fP.
-Any command associated with the \fBRETURN\fP trap is executed
-before execution resumes after the function or script.
-.TP
-\fBset\fP [\fB\-\-abefhkmnptuvxBCEHPT\fP] [\fB\-o\fP \fIoption\-name\fP] [\fIarg\fP ...]
-.PD 0
-.TP
-\fBset\fP [\fB+abefhkmnptuvxBCEHPT\fP] [\fB+o\fP \fIoption\-name\fP] [\fIarg\fP ...]
-.PD
-Without options, the name and value of each shell variable are displayed
-in a format that can be reused as input
-for setting or resetting the currently-set variables.
-Read-only variables cannot be reset.
-In \fIposix\fP mode, only shell variables are listed.
-The output is sorted according to the current locale.
-When options are specified, they set or unset shell attributes.
-Any arguments remaining after option processing are treated
-as values for the positional parameters and are assigned, in order, to
-.BR $1 ,
-.BR $2 ,
-.B ...
-.BR $\fIn\fP .
-Options, if specified, have the following meanings:
-.RS
-.PD 0
-.TP 8
-.B \-a
-Automatically mark variables and functions which are modified or
-created for export to the environment of subsequent commands.
-.TP 8
-.B \-b
-Report the status of terminated background jobs
-immediately, rather than before the next primary prompt. This is
-effective only when job control is enabled.
-.TP 8
-.B \-e
-Exit immediately if a
-\fIpipeline\fP (which may consist of a single \fIsimple command\fP),
-a \fIlist\fP,
-or a \fIcompound command\fP
-(see
-.SM
-.B SHELL GRAMMAR
-above), exits with a non-zero status.
-The shell does not exit if the
-command that fails is part of the command list immediately following a
-.B while
-or
-.B until
-keyword,
-part of the test following the
-.B if
-or
-.B elif
-reserved words, part of any command executed in a
-.B &&
-or
-.B ||
-list except the command following the final \fB&&\fP or \fB||\fP,
-any command in a pipeline but the last,
-or if the command's return value is
-being inverted with
-.BR ! .
-If a compound command other than a subshell
-returns a non-zero status because a command failed
-while \fB\-e\fP was being ignored, the shell does not exit.
-A trap on \fBERR\fP, if set, is executed before the shell exits.
-This option applies to the shell environment and each subshell environment
-separately (see
-.SM
-.B "COMMAND EXECUTION ENVIRONMENT"
-above), and may cause
-subshells to exit before executing all the commands in the subshell.
-.if t .sp 0.5
-.if n .sp 1
-If a compound command or shell function executes in a context
-where \fB\-e\fP is being ignored,
-none of the commands executed within the compound command or function body
-will be affected by the \fB\-e\fP setting, even if \fB\-e\fP is set
-and a command returns a failure status.
-If a compound command or shell function sets \fB\-e\fP while executing in
-a context where \fB\-e\fP is ignored, that setting will not have any
-effect until the compound command or the command containing the function
-call completes.
-.TP 8
-.B \-f
-Disable pathname expansion.
-.TP 8
-.B \-h
-Remember the location of commands as they are looked up for execution.
-This is enabled by default.
-.TP 8
-.B \-k
-All arguments in the form of assignment statements
-are placed in the environment for a command, not just
-those that precede the command name.
-.TP 8
-.B \-m
-Monitor mode. Job control is enabled. This option is on
-by default for interactive shells on systems that support
-it (see
-.SM
-.B JOB CONTROL
-above).
-All processes run in a separate process group.
-When a background job completes, the shell prints a line
-containing its exit status.
-.TP 8
-.B \-n
-Read commands but do not execute them. This may be used to
-check a shell script for syntax errors. This is ignored by
-interactive shells.
-.TP 8
-.B \-o \fIoption\-name\fP
-The \fIoption\-name\fP can be one of the following:
-.RS
-.TP 8
-.B allexport
-Same as
-.BR \-a .
-.TP 8
-.B braceexpand
-Same as
-.BR \-B .
-.TP 8
-.B emacs
-Use an emacs-style command line editing interface. This is enabled
-by default when the shell is interactive, unless the shell is started
-with the
-.B \-\-noediting
-option.
-This also affects the editing interface used for \fBread \-e\fP.
-.TP 8
-.B errexit
-Same as
-.BR \-e .
-.TP 8
-.B errtrace
-Same as
-.BR \-E .
-.TP 8
-.B functrace
-Same as
-.BR \-T .
-.TP 8
-.B hashall
-Same as
-.BR \-h .
-.TP 8
-.B histexpand
-Same as
-.BR \-H .
-.TP 8
-.B history
-Enable command history, as described above under
-.SM
-.BR HISTORY .
-This option is on by default in interactive shells.
-.TP 8
-.B ignoreeof
-The effect is as if the shell command
-.if t \f(CWIGNOREEOF=10\fP
-.if n ``IGNOREEOF=10''
-had been executed
-(see
-.B Shell Variables
-above).
-.TP 8
-.B keyword
-Same as
-.BR \-k .
-.TP 8
-.B monitor
-Same as
-.BR \-m .
-.TP 8
-.B noclobber
-Same as
-.BR \-C .
-.TP 8
-.B noexec
-Same as
-.BR \-n .
-.TP 8
-.B noglob
-Same as
-.BR \-f .
-.TP 8
-.B nolog
-Currently ignored.
-.TP 8
-.B notify
-Same as
-.BR \-b .
-.TP 8
-.B nounset
-Same as
-.BR \-u .
-.TP 8
-.B onecmd
-Same as
-.BR \-t .
-.TP 8
-.B physical
-Same as
-.BR \-P .
-.TP 8
-.B pipefail
-If set, the return value of a pipeline is the value of the last
-(rightmost) command to exit with a non-zero status, or zero if all
-commands in the pipeline exit successfully.
-This option is disabled by default.
-.TP 8
-.B posix
-Change the behavior of
-.B bash
-where the default operation differs
-from the POSIX standard to match the standard (\fIposix mode\fP).
-See
-.SM
-.B "SEE ALSO"
-below for a reference to a document that details how posix mode affects
-bash's behavior.
-.TP 8
-.B privileged
-Same as
-.BR \-p .
-.TP 8
-.B verbose
-Same as
-.BR \-v .
-.TP 8
-.B vi
-Use a vi-style command line editing interface.
-This also affects the editing interface used for \fBread \-e\fP.
-.TP 8
-.B xtrace
-Same as
-.BR \-x .
-.sp .5
-.PP
-If
-.B \-o
-is supplied with no \fIoption\-name\fP, the values of the current options are
-printed.
-If
-.B +o
-is supplied with no \fIoption\-name\fP, a series of
-.B set
-commands to recreate the current option settings is displayed on
-the standard output.
-.RE
-.TP 8
-.B \-p
-Turn on
-.I privileged
-mode. In this mode, the
-.SM
-.B $ENV
-and
-.SM
-.B $BASH_ENV
-files are not processed, shell functions are not inherited from the
-environment, and the
-.SM
-.BR SHELLOPTS ,
-.SM
-.BR BASHOPTS ,
-.SM
-.BR CDPATH ,
-and
-.SM
-.B GLOBIGNORE
-variables, if they appear in the environment, are ignored.
-If the shell is started with the effective user (group) id not equal to the
-real user (group) id, and the \fB\-p\fP option is not supplied, these actions
-are taken and the effective user id is set to the real user id.
-If the \fB\-p\fP option is supplied at startup, the effective user id is
-not reset.
-Turning this option off causes the effective user
-and group ids to be set to the real user and group ids.
-.TP 8
-.B \-t
-Exit after reading and executing one command.
-.TP 8
-.B \-u
-Treat unset variables and parameters other than the special
-parameters "@" and "*" as an error when performing
-parameter expansion. If expansion is attempted on an
-unset variable or parameter, the shell prints an error message, and,
-if not interactive, exits with a non-zero status.
-.TP 8
-.B \-v
-Print shell input lines as they are read.
-.TP 8
-.B \-x
-After expanding each \fIsimple command\fP,
-\fBfor\fP command, \fBcase\fP command, \fBselect\fP command, or
-arithmetic \fBfor\fP command, display the expanded value of
-.SM
-.BR PS4 ,
-followed by the command and its expanded arguments
-or associated word list.
-.TP 8
-.B \-B
-The shell performs brace expansion (see
-.B Brace Expansion
-above). This is on by default.
-.TP 8
-.B \-C
-If set,
-.B bash
-does not overwrite an existing file with the
-.BR > ,
-.BR >& ,
-and
-.B <>
-redirection operators. This may be overridden when
-creating output files by using the redirection operator
-.B >|
-instead of
-.BR > .
-.TP 8
-.B \-E
-If set, any trap on \fBERR\fP is inherited by shell functions, command
-substitutions, and commands executed in a subshell environment.
-The \fBERR\fP trap is normally not inherited in such cases.
-.TP 8
-.B \-H
-Enable
-.B !
-style history substitution. This option is on by
-default when the shell is interactive.
-.TP 8
-.B \-P
-If set, the shell does not resolve symbolic links when executing
-commands such as
-.B cd
-that change the current working directory. It uses the
-physical directory structure instead. By default,
-.B bash
-follows the logical chain of directories when performing commands
-which change the current directory.
-.TP 8
-.B \-T
-If set, any traps on \fBDEBUG\fP and \fBRETURN\fP are inherited by shell
-functions, command substitutions, and commands executed in a
-subshell environment.
-The \fBDEBUG\fP and \fBRETURN\fP traps are normally not inherited
-in such cases.
-.TP 8
-.B \-\-
-If no arguments follow this option, then the positional parameters are
-unset. Otherwise, the positional parameters are set to the
-\fIarg\fPs, even if some of them begin with a
-.BR \- .
-.TP 8
-.B \-
-Signal the end of options, cause all remaining \fIarg\fPs to be
-assigned to the positional parameters. The
-.B \-x
-and
-.B \-v
-options are turned off.
-If there are no \fIarg\fPs,
-the positional parameters remain unchanged.
-.PD
-.PP
-The options are off by default unless otherwise noted.
-Using + rather than \- causes these options to be turned off.
-The options can also be specified as arguments to an invocation of
-the shell.
-The current set of options may be found in
-.BR $\- .
-The return status is always true unless an invalid option is encountered.
-.RE
-.TP
-\fBshift\fP [\fIn\fP]
-The positional parameters from \fIn\fP+1 ... are renamed to
-.B $1
-.B ....
-Parameters represented by the numbers \fB$#\fP
-down to \fB$#\fP\-\fIn\fP+1 are unset.
-.I n
-must be a non-negative number less than or equal to \fB$#\fP.
-If
-.I n
-is 0, no parameters are changed.
-If
-.I n
-is not given, it is assumed to be 1.
-If
-.I n
-is greater than \fB$#\fP, the positional parameters are not changed.
-The return status is greater than zero if
-.I n
-is greater than
-.B $#
-or less than zero; otherwise 0.
-.TP
-\fBshopt\fP [\fB\-pqsu\fP] [\fB\-o\fP] [\fIoptname\fP ...]
-Toggle the values of settings controlling optional shell behavior.
-The settings can be either those listed below, or, if the
-.B \-o
-option is used, those available with the
-.B \-o
-option to the \fBset\fP builtin command.
-With no options, or with the
-.B \-p
-option, a list of all settable options is displayed, with
-an indication of whether or not each is set.
-The \fB\-p\fP option causes output to be displayed in a form that
-may be reused as input.
-Other options have the following meanings:
-.RS
-.PD 0
-.TP
-.B \-s
-Enable (set) each \fIoptname\fP.
-.TP
-.B \-u
-Disable (unset) each \fIoptname\fP.
-.TP
-.B \-q
-Suppresses normal output (quiet mode); the return status indicates
-whether the \fIoptname\fP is set or unset.
-If multiple \fIoptname\fP arguments are given with
-.BR \-q ,
-the return status is zero if all \fIoptnames\fP are enabled; non-zero
-otherwise.
-.TP
-.B \-o
-Restricts the values of \fIoptname\fP to be those defined for the
-.B \-o
-option to the
-.B set
-builtin.
-.PD
-.PP
-If either
-.B \-s
-or
-.B \-u
-is used with no \fIoptname\fP arguments,
-.B shopt
-shows only those options which are set or unset, respectively.
-Unless otherwise noted, the \fBshopt\fP options are disabled (unset)
-by default.
-.PP
-The return status when listing options is zero if all \fIoptnames\fP
-are enabled, non-zero otherwise. When setting or unsetting options,
-the return status is zero unless an \fIoptname\fP is not a valid shell
-option.
-.PP
-The list of \fBshopt\fP options is:
-.if t .sp .5v
-.if n .sp 1v
-.PD 0
-.TP 8
-.B autocd
-If set, a command name that is the name of a directory is executed as if
-it were the argument to the \fBcd\fP command.
-This option is only used by interactive shells.
-.TP 8
-.B cdable_vars
-If set, an argument to the
-.B cd
-builtin command that
-is not a directory is assumed to be the name of a variable whose
-value is the directory to change to.
-.TP 8
-.B cdspell
-If set, minor errors in the spelling of a directory component in a
-.B cd
-command will be corrected.
-The errors checked for are transposed characters,
-a missing character, and one character too many.
-If a correction is found, the corrected filename is printed,
-and the command proceeds.
-This option is only used by interactive shells.
-.TP 8
-.B checkhash
-If set, \fBbash\fP checks that a command found in the hash
-table exists before trying to execute it. If a hashed command no
-longer exists, a normal path search is performed.
-.TP 8
-.B checkjobs
-If set, \fBbash\fP lists the status of any stopped and running jobs before
-exiting an interactive shell. If any jobs are running, this causes
-the exit to be deferred until a second exit is attempted without an
-intervening command (see
-.SM
-.B "JOB CONTROL"
-above). The shell always
-postpones exiting if any jobs are stopped.
-.TP 8
-.B checkwinsize
-If set, \fBbash\fP checks the window size after each command
-and, if necessary, updates the values of
-.SM
-.B LINES
-and
-.SM
-.BR COLUMNS .
-.TP 8
-.B cmdhist
-If set,
-.B bash
-attempts to save all lines of a multiple-line
-command in the same history entry. This allows
-easy re-editing of multi-line commands.
-.TP 8
-.B compat31
-If set,
-.B bash
-changes its behavior to that of version 3.1 with respect to quoted
-arguments to the \fB[[\fP conditional command's \fB=~\fP operator
-and locale-specific string comparison when using the \fB[[\fP
-conditional command's \fB<\fP and \fB>\fP operators.
-Bash versions prior to bash-4.1 use ASCII collation and
-.IR strcmp (3);
-bash-4.1 and later use the current locale's collation sequence and
-.IR strcoll (3).
-.TP 8
-.B compat32
-If set,
-.B bash
-changes its behavior to that of version 3.2 with respect to
-locale-specific string comparison when using the \fB[[\fP
-conditional command's \fB<\fP and \fB>\fP operators (see previous item).
-.TP 8
-.B compat40
-If set,
-.B bash
-changes its behavior to that of version 4.0 with respect to locale-specific
-string comparison when using the \fB[[\fP
-conditional command's \fB<\fP and \fB>\fP operators (see description of
-\fBcompat31\fP)
-and the effect of interrupting a command list.
-Bash versions 4.0 and later interrupt the list as if the shell received the
-interrupt; previous versions continue with the next command in the list.
-.TP 8
-.B compat41
-If set,
-.BR bash ,
-when in \fIposix\fP mode, treats a single quote in a double-quoted
-parameter expansion as a special character. The single quotes must match
-(an even number) and the characters between the single quotes are considered
-quoted. This is the behavior of posix mode through version 4.1.
-The default bash behavior remains as in previous versions.
-.TP 8
-.B compat42
-If set,
-.B bash
-does not process the replacement string in the pattern substitution word
-expansion using quote removal.
-.TP 8
-.B complete_fullquote
-If set,
-.B bash
-quotes all shell metacharacters in filenames and directory names when
-performing completion.
-If not set,
-.B bash
-removes metacharacters such as the dollar sign from the set of
-characters that will be quoted in completed filenames
-when these metacharacters appear in shell variable references in words to be
-completed.
-This means that dollar signs in variable names that expand to directories
-will not be quoted;
-however, any dollar signs appearing in filenames will not be quoted, either.
-This is active only when bash is using backslashes to quote completed
-filenames.
-This variable is set by default, which is the default bash behavior in
-versions through 4.2.
-.TP 8
-.B direxpand
-If set,
-.B bash
-replaces directory names with the results of word expansion when performing
-filename completion. This changes the contents of the readline editing
-buffer.
-If not set,
-.B bash
-attempts to preserve what the user typed.
-.TP 8
-.B dirspell
-If set,
-.B bash
-attempts spelling correction on directory names during word completion
-if the directory name initially supplied does not exist.
-.TP 8
-.B dotglob
-If set,
-.B bash
-includes filenames beginning with a `.' in the results of pathname
-expansion.
-.TP 8
-.B execfail
-If set, a non-interactive shell will not exit if
-it cannot execute the file specified as an argument to the
-.B exec
-builtin command. An interactive shell does not exit if
-.B exec
-fails.
-.TP 8
-.B expand_aliases
-If set, aliases are expanded as described above under
-.SM
-.BR ALIASES .
-This option is enabled by default for interactive shells.
-.TP 8
-.B extdebug
-If set, behavior intended for use by debuggers is enabled:
-.RS
-.TP
-.B 1.
-The \fB\-F\fP option to the \fBdeclare\fP builtin displays the source
-file name and line number corresponding to each function name supplied
-as an argument.
-.TP
-.B 2.
-If the command run by the \fBDEBUG\fP trap returns a non-zero value, the
-next command is skipped and not executed.
-.TP
-.B 3.
-If the command run by the \fBDEBUG\fP trap returns a value of 2, and the
-shell is executing in a subroutine (a shell function or a shell script
-executed by the \fB.\fP or \fBsource\fP builtins), the shell simulates
-a call to \fBreturn\fP.
-.TP
-.B 4.
-.SM
-.B BASH_ARGC
-and
-.SM
-.B BASH_ARGV
-are updated as described in their descriptions above.
-.TP
-.B 5.
-Function tracing is enabled: command substitution, shell functions, and
-subshells invoked with \fB(\fP \fIcommand\fP \fB)\fP inherit the
-\fBDEBUG\fP and \fBRETURN\fP traps.
-.TP
-.B 6.
-Error tracing is enabled: command substitution, shell functions, and
-subshells invoked with \fB(\fP \fIcommand\fP \fB)\fP inherit the
-\fBERR\fP trap.
-.RE
-.TP 8
-.B extglob
-If set, the extended pattern matching features described above under
-\fBPathname Expansion\fP are enabled.
-.TP 8
-.B extquote
-If set, \fB$\fP\(aq\fIstring\fP\(aq and \fB$\fP"\fIstring\fP" quoting is
-performed within \fB${\fP\fIparameter\fP\fB}\fP expansions
-enclosed in double quotes. This option is enabled by default.
-.TP 8
-.B failglob
-If set, patterns which fail to match filenames during pathname expansion
-result in an expansion error.
-.TP 8
-.B force_fignore
-If set, the suffixes specified by the
-.SM
-.B FIGNORE
-shell variable
-cause words to be ignored when performing word completion even if
-the ignored words are the only possible completions.
-See
-.SM
-\fBSHELL VARIABLES\fP
-above for a description of
-.SM
-.BR FIGNORE .
-This option is enabled by default.
-.TP 8
-.B globasciiranges
-If set, range expressions used in pattern matching bracket expressions (see
-.SM
-.B Pattern Matching
-above) behave as if in the traditional C locale when performing
-comparisons. That is, the current locale's collating sequence
-is not taken into account, so
-.B b
-will not collate between
-.B A
-and
-.BR B ,
-and upper-case and lower-case ASCII characters will collate together.
-.TP 8
-.B globstar
-If set, the pattern \fB**\fP used in a pathname expansion context will
-match all files and zero or more directories and subdirectories.
-If the pattern is followed by a \fB/\fP, only directories and
-subdirectories match.
-.TP 8
-.B gnu_errfmt
-If set, shell error messages are written in the standard GNU error
-message format.
-.TP 8
-.B histappend
-If set, the history list is appended to the file named by the value
-of the
-.SM
-.B HISTFILE
-variable when the shell exits, rather than overwriting the file.
-.TP 8
-.B histreedit
-If set, and
-.B readline
-is being used, a user is given the opportunity to re-edit a
-failed history substitution.
-.TP 8
-.B histverify
-If set, and
-.B readline
-is being used, the results of history substitution are not immediately
-passed to the shell parser. Instead, the resulting line is loaded into
-the \fBreadline\fP editing buffer, allowing further modification.
-.TP 8
-.B hostcomplete
-If set, and
-.B readline
-is being used, \fBbash\fP will attempt to perform hostname completion when a
-word containing a \fB@\fP is being completed (see
-.B Completing
-under
-.SM
-.B READLINE
-above).
-This is enabled by default.
-.TP 8
-.B huponexit
-If set, \fBbash\fP will send
-.SM
-.B SIGHUP
-to all jobs when an interactive login shell exits.
-.TP 8
-.B interactive_comments
-If set, allow a word beginning with
-.B #
-to cause that word and all remaining characters on that
-line to be ignored in an interactive shell (see
-.SM
-.B COMMENTS
-above). This option is enabled by default.
-.TP 8
-.B lastpipe
-If set, and job control is not active, the shell runs the last command of
-a pipeline not executed in the background in the current shell environment.
-.TP 8
-.B lithist
-If set, and the
-.B cmdhist
-option is enabled, multi-line commands are saved to the history with
-embedded newlines rather than using semicolon separators where possible.
-.TP 8
-.B login_shell
-The shell sets this option if it is started as a login shell (see
-.SM
-.B "INVOCATION"
-above).
-The value may not be changed.
-.TP 8
-.B mailwarn
-If set, and a file that \fBbash\fP is checking for mail has been
-accessed since the last time it was checked, the message ``The mail in
-\fImailfile\fP has been read'' is displayed.
-.TP 8
-.B no_empty_cmd_completion
-If set, and
-.B readline
-is being used,
-.B bash
-will not attempt to search the
-.SM
-.B PATH
-for possible completions when
-completion is attempted on an empty line.
-.TP 8
-.B nocaseglob
-If set,
-.B bash
-matches filenames in a case\-insensitive fashion when performing pathname
-expansion (see
-.B Pathname Expansion
-above).
-.TP 8
-.B nocasematch
-If set,
-.B bash
-matches patterns in a case\-insensitive fashion when performing matching
-while executing \fBcase\fP or \fB[[\fP conditional commands.
-.TP 8
-.B nullglob
-If set,
-.B bash
-allows patterns which match no
-files (see
-.B Pathname Expansion
-above)
-to expand to a null string, rather than themselves.
-.TP 8
-.B progcomp
-If set, the programmable completion facilities (see
-\fBProgrammable Completion\fP above) are enabled.
-This option is enabled by default.
-.TP 8
-.B promptvars
-If set, prompt strings undergo
-parameter expansion, command substitution, arithmetic
-expansion, and quote removal after being expanded as described in
-.SM
-.B PROMPTING
-above. This option is enabled by default.
-.TP 8
-.B restricted_shell
-The shell sets this option if it is started in restricted mode (see
-.SM
-.B "RESTRICTED SHELL"
-below).
-The value may not be changed.
-This is not reset when the startup files are executed, allowing
-the startup files to discover whether or not a shell is restricted.
-.TP 8
-.B shift_verbose
-If set, the
-.B shift
-builtin prints an error message when the shift count exceeds the
-number of positional parameters.
-.TP 8
-.B sourcepath
-If set, the
-\fBsource\fP (\fB.\fP) builtin uses the value of
-.SM
-.B PATH
-to find the directory containing the file supplied as an argument.
-This option is enabled by default.
-.TP 8
-.B xpg_echo
-If set, the \fBecho\fP builtin expands backslash-escape sequences
-by default.
-.RE
-.PD
-.TP
-\fBsuspend\fP [\fB\-f\fP]
-Suspend the execution of this shell until it receives a
-.SM
-.B SIGCONT
-signal. A login shell cannot be suspended; the
-.B \-f
-option can be used to override this and force the suspension.
-The return status is 0 unless the shell is a login shell and
-.B \-f
-is not supplied, or if job control is not enabled.
-.TP
-\fBtest\fP \fIexpr\fP
-.PD 0
-.TP
-\fB[\fP \fIexpr\fP \fB]\fP
-Return a status of 0 (true) or 1 (false) depending on
-the evaluation of the conditional expression
-.IR expr .
-Each operator and operand must be a separate argument.
-Expressions are composed of the primaries described above under
-.SM
-.BR "CONDITIONAL EXPRESSIONS" .
-\fBtest\fP does not accept any options, nor does it accept and ignore
-an argument of \fB\-\-\fP as signifying the end of options.
-.if t .sp 0.5
-.if n .sp 1
-Expressions may be combined using the following operators, listed
-in decreasing order of precedence.
-The evaluation depends on the number of arguments; see below.
-Operator precedence is used when there are five or more arguments.
-.RS
-.PD 0
-.TP
-.B ! \fIexpr\fP
-True if
-.I expr
-is false.
-.TP
-.B ( \fIexpr\fP )
-Returns the value of \fIexpr\fP.
-This may be used to override the normal precedence of operators.
-.TP
-\fIexpr1\fP \-\fBa\fP \fIexpr2\fP
-True if both
-.I expr1
-and
-.I expr2
-are true.
-.TP
-\fIexpr1\fP \-\fBo\fP \fIexpr2\fP
-True if either
-.I expr1
-or
-.I expr2
-is true.
-.PD
-.PP
-\fBtest\fP and \fB[\fP evaluate conditional
-expressions using a set of rules based on the number of arguments.
-.if t .sp 0.5
-.if n .sp 1
-.PD 0
-.TP
-0 arguments
-The expression is false.
-.TP
-1 argument
-The expression is true if and only if the argument is not null.
-.TP
-2 arguments
-If the first argument is \fB!\fP, the expression is true if and
-only if the second argument is null.
-If the first argument is one of the unary conditional operators listed above
-under
-.SM
-.BR "CONDITIONAL EXPRESSIONS" ,
-the expression is true if the unary test is true.
-If the first argument is not a valid unary conditional operator, the expression
-is false.
-.TP
-3 arguments
-The following conditions are applied in the order listed.
-If the second argument is one of the binary conditional operators listed above
-under
-.SM
-.BR "CONDITIONAL EXPRESSIONS" ,
-the result of the expression is the result of the binary test using
-the first and third arguments as operands.
-The \fB\-a\fP and \fB\-o\fP operators are considered binary operators
-when there are three arguments.
-If the first argument is \fB!\fP, the value is the negation of
-the two-argument test using the second and third arguments.
-If the first argument is exactly \fB(\fP and the third argument is
-exactly \fB)\fP, the result is the one-argument test of the second
-argument.
-Otherwise, the expression is false.
-.TP
-4 arguments
-If the first argument is \fB!\fP, the result is the negation of
-the three-argument expression composed of the remaining arguments.
-Otherwise, the expression is parsed and evaluated according to
-precedence using the rules listed above.
-.TP
-5 or more arguments
-The expression is parsed and evaluated according to precedence
-using the rules listed above.
-.if t .sp 0.5
-.if n .sp 1
-.LP
-When used with \fBtest\fP or \fB[\fP, the \fB<\fP and \fB>\fP operators
-sort lexicographically using ASCII ordering.
-.RE
-.PD
-.TP
-.B times
-Print the accumulated user and system times for the shell and
-for processes run from the shell. The return status is 0.
-.TP
-\fBtrap\fP [\fB\-lp\fP] [[\fIarg\fP] \fIsigspec\fP ...]
-The command
-.I arg
-is to be read and executed when the shell receives
-signal(s)
-.IR sigspec .
-If
-.I arg
-is absent (and there is a single \fIsigspec\fP) or
-.BR \- ,
-each specified signal is
-reset to its original disposition (the value it had
-upon entrance to the shell).
-If
-.I arg
-is the null string the signal specified by each
-.I sigspec
-is ignored by the shell and by the commands it invokes.
-If
-.I arg
-is not present and
-.B \-p
-has been supplied, then the trap commands associated with each
-.I sigspec
-are displayed.
-If no arguments are supplied or if only
-.B \-p
-is given,
-.B trap
-prints the list of commands associated with each signal.
-The
-.B \-l
-option causes the shell to print a list of signal names and
-their corresponding numbers.
-Each
-.I sigspec
-is either
-a signal name defined in <\fIsignal.h\fP>, or a signal number.
-Signal names are case insensitive and the
-.SM
-.B SIG
-prefix is optional.
-.if t .sp 0.5
-.if n .sp 1
-If a
-.I sigspec
-is
-.SM
-.B EXIT
-(0) the command
-.I arg
-is executed on exit from the shell.
-If a
-.I sigspec
-is
-.SM
-.BR DEBUG ,
-the command
-.I arg
-is executed before every \fIsimple command\fP, \fIfor\fP command,
-\fIcase\fP command, \fIselect\fP command, every arithmetic \fIfor\fP
-command, and before the first command executes in a shell function (see
-.SM
-.B SHELL GRAMMAR
-above).
-Refer to the description of the \fBextdebug\fP option to the
-\fBshopt\fP builtin for details of its effect on the \fBDEBUG\fP trap.
-If a
-.I sigspec
-is
-.SM
-.BR RETURN ,
-the command
-.I arg
-is executed each time a shell function or a script executed with
-the \fB.\fP or \fBsource\fP builtins finishes executing.
-.if t .sp 0.5
-.if n .sp 1
-If a
-.I sigspec
-is
-.SM
-.BR ERR ,
-the command
-.I arg
-is executed whenever a
-a pipeline (which may consist of a single simple
-command), a list, or a compound command returns a
-non\-zero exit status,
-subject to the following conditions.
-The
-.SM
-.B ERR
-trap is not executed if the failed
-command is part of the command list immediately following a
-.B while
-or
-.B until
-keyword,
-part of the test in an
-.I if
-statement, part of a command executed in a
-.B &&
-or
-.B ||
-list except the command following the final \fB&&\fP or \fB||\fP,
-any command in a pipeline but the last,
-or if the command's return value is
-being inverted using
-.BR ! .
-These are the same conditions obeyed by the \fBerrexit\fP (\fB\-e\fP) option.
-.if t .sp 0.5
-.if n .sp 1
-Signals ignored upon entry to the shell cannot be trapped or reset.
-Trapped signals that are not being ignored are reset to their original
-values in a subshell or subshell environment when one is created.
-The return status is false if any
-.I sigspec
-is invalid; otherwise
-.B trap
-returns true.
-.TP
-\fBtype\fP [\fB\-aftpP\fP] \fIname\fP [\fIname\fP ...]
-With no options,
-indicate how each
-.I name
-would be interpreted if used as a command name.
-If the
-.B \-t
-option is used,
-.B type
-prints a string which is one of
-.IR alias ,
-.IR keyword ,
-.IR function ,
-.IR builtin ,
-or
-.I file
-if
-.I name
-is an alias, shell reserved word, function, builtin, or disk file,
-respectively.
-If the
-.I name
-is not found, then nothing is printed, and an exit status of false
-is returned.
-If the
-.B \-p
-option is used,
-.B type
-either returns the name of the disk file
-that would be executed if
-.I name
-were specified as a command name,
-or nothing if
-.if t \f(CWtype -t name\fP
-.if n ``type -t name''
-would not return
-.IR file .
-The
-.B \-P
-option forces a
-.SM
-.B PATH
-search for each \fIname\fP, even if
-.if t \f(CWtype -t name\fP
-.if n ``type -t name''
-would not return
-.IR file .
-If a command is hashed,
-.B \-p
-and
-.B \-P
-print the hashed value, which is not necessarily the file that appears
-first in
-.SM
-.BR PATH .
-If the
-.B \-a
-option is used,
-.B type
-prints all of the places that contain
-an executable named
-.IR name .
-This includes aliases and functions,
-if and only if the
-.B \-p
-option is not also used.
-The table of hashed commands is not consulted
-when using
-.BR \-a .
-The
-.B \-f
-option suppresses shell function lookup, as with the \fBcommand\fP builtin.
-.B type
-returns true if all of the arguments are found, false if
-any are not found.
-.TP
-\fBulimit\fP [\fB\-HSTabcdefilmnpqrstuvx\fP [\fIlimit\fP]]
-Provides control over the resources available to the shell and to
-processes started by it, on systems that allow such control.
-The \fB\-H\fP and \fB\-S\fP options specify that the hard or soft limit is
-set for the given resource.
-A hard limit cannot be increased by a non-root user once it is set;
-a soft limit may be increased up to the value of the hard limit.
-If neither \fB\-H\fP nor \fB\-S\fP is specified, both the soft and hard
-limits are set.
-The value of
-.I limit
-can be a number in the unit specified for the resource
-or one of the special values
-.BR hard ,
-.BR soft ,
-or
-.BR unlimited ,
-which stand for the current hard limit, the current soft limit, and
-no limit, respectively.
-If
-.I limit
-is omitted, the current value of the soft limit of the resource is
-printed, unless the \fB\-H\fP option is given. When more than one
-resource is specified, the limit name and unit are printed before the value.
-Other options are interpreted as follows:
-.RS
-.PD 0
-.TP
-.B \-a
-All current limits are reported
-.TP
-.B \-b
-The maximum socket buffer size
-.TP
-.B \-c
-The maximum size of core files created
-.TP
-.B \-d
-The maximum size of a process's data segment
-.TP
-.B \-e
-The maximum scheduling priority ("nice")
-.TP
-.B \-f
-The maximum size of files written by the shell and its children
-.TP
-.B \-i
-The maximum number of pending signals
-.TP
-.B \-l
-The maximum size that may be locked into memory
-.TP
-.B \-m
-The maximum resident set size (many systems do not honor this limit)
-.TP
-.B \-n
-The maximum number of open file descriptors (most systems do not
-allow this value to be set)
-.TP
-.B \-p
-The pipe size in 512-byte blocks (this may not be set)
-.TP
-.B \-q
-The maximum number of bytes in POSIX message queues
-.TP
-.B \-r
-The maximum real-time scheduling priority
-.TP
-.B \-s
-The maximum stack size
-.TP
-.B \-t
-The maximum amount of cpu time in seconds
-.TP
-.B \-u
-The maximum number of processes available to a single user
-.TP
-.B \-v
-The maximum amount of virtual memory available to the shell and, on
-some systems, to its children
-.TP
-.B \-x
-The maximum number of file locks
-.TP
-.B \-T
-The maximum number of threads
-.PD
-.PP
-If
-.I limit
-is given, and the
-.B \-a
-option is not used,
-\fIlimit\fP is the new value of the specified resource.
-If no option is given, then
-.B \-f
-is assumed. Values are in 1024-byte increments, except for
-.BR \-t ,
-which is in seconds;
-.BR \-p ,
-which is in units of 512-byte blocks;
-and
-.BR \-T ,
-.BR \-b ,
-.BR \-n ,
-and
-.BR \-u ,
-which are unscaled values.
-The return status is 0 unless an invalid option or argument is supplied,
-or an error occurs while setting a new limit.
-.RE
-.TP
-\fBumask\fP [\fB\-p\fP] [\fB\-S\fP] [\fImode\fP]
-The user file-creation mask is set to
-.IR mode .
-If
-.I mode
-begins with a digit, it
-is interpreted as an octal number; otherwise
-it is interpreted as a symbolic mode mask similar
-to that accepted by
-.IR chmod (1).
-If
-.I mode
-is omitted, the current value of the mask is printed.
-The
-.B \-S
-option causes the mask to be printed in symbolic form; the
-default output is an octal number.
-If the
-.B \-p
-option is supplied, and
-.I mode
-is omitted, the output is in a form that may be reused as input.
-The return status is 0 if the mode was successfully changed or if
-no \fImode\fP argument was supplied, and false otherwise.
-.TP
-\fBunalias\fP [\-\fBa\fP] [\fIname\fP ...]
-Remove each \fIname\fP from the list of defined aliases. If
-.B \-a
-is supplied, all alias definitions are removed. The return
-value is true unless a supplied
-.I name
-is not a defined alias.
-.TP
-\fBunset\fP [\-\fBfv\fP] [\-\fBn\fP] [\fIname\fP ...]
-For each
-.IR name ,
-remove the corresponding variable or function.
-If the
-.B \-v
-option is given, each
-.I name
-refers to a shell variable, and that variable is removed.
-Read-only variables may not be unset.
-If
-.B \-f
-is specified, each
-.I name
-refers to a shell function, and the function definition
-is removed.
-If the
-.B \-n
-option is supplied, and \fIname\fP is a variable with the \fInameref\fP
-attribute, \fIname\fP will be unset rather than the variable it
-references.
-\fB\-n\fP has no effect if the \fB\-f\fP option is supplied.
-If no options are supplied, each \fIname\fP refers to a variable; if
-there is no variable by that name, any function with that name is
-unset.
-Each unset variable or function is removed from the environment
-passed to subsequent commands.
-If any of
-.SM
-.BR COMP_WORDBREAKS ,
-.SM
-.BR RANDOM ,
-.SM
-.BR SECONDS ,
-.SM
-.BR LINENO ,
-.SM
-.BR HISTCMD ,
-.SM
-.BR FUNCNAME ,
-.SM
-.BR GROUPS ,
-or
-.SM
-.B DIRSTACK
-are unset, they lose their special properties, even if they are
-subsequently reset. The exit status is true unless a
-.I name
-is readonly.
-.TP
-\fBwait\fP [\fB\-n\fP] [\fIn ...\fP]
-Wait for each specified child process and return its termination status.
-Each
-.I n
-may be a process
-ID or a job specification; if a job spec is given, all processes
-in that job's pipeline are waited for. If
-.I n
-is not given, all currently active child processes
-are waited for, and the return status is zero.
-If the \fB\-n\fP option is supplied, \fBwait\fP waits for any job to
-terminate and returns its exit status.
-If
-.I n
-specifies a non-existent process or job, the return status is
-127. Otherwise, the return status is the exit status of the last
-process or job waited for.
-.\" bash_builtins
-.if \n(zZ=1 .ig zZ
-.SH "RESTRICTED SHELL"
-.\" rbash.1
-.zY
-.PP
-If
-.B bash
-is started with the name
-.BR rbash ,
-or the
-.B \-r
-option is supplied at invocation,
-the shell becomes restricted.
-A restricted shell is used to
-set up an environment more controlled than the standard shell.
-It behaves identically to
-.B bash
-with the exception that the following are disallowed or not performed:
-.IP \(bu
-changing directories with \fBcd\fP
-.IP \(bu
-setting or unsetting the values of
-.SM
-.BR SHELL ,
-.SM
-.BR PATH ,
-.SM
-.BR ENV ,
-or
-.SM
-.B BASH_ENV
-.IP \(bu
-specifying command names containing
-.B /
-.IP \(bu
-specifying a filename containing a
-.B /
-as an argument to the
-.B .
-builtin command
-.IP \(bu
-specifying a filename containing a slash as an argument to the
-.B \-p
-option to the
-.B hash
-builtin command
-.IP \(bu
-importing function definitions from the shell environment at startup
-.IP \(bu
-parsing the value of
-.SM
-.B SHELLOPTS
-from the shell environment at startup
-.IP \(bu
-redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
-.IP \(bu
-using the
-.B exec
-builtin command to replace the shell with another command
-.IP \(bu
-adding or deleting builtin commands with the
-.B \-f
-and
-.B \-d
-options to the
-.B enable
-builtin command
-.IP \(bu
-using the \fBenable\fP builtin command to enable disabled shell builtins
-.IP \(bu
-specifying the
-.B \-p
-option to the
-.B command
-builtin command
-.IP \(bu
-turning off restricted mode with
-\fBset +r\fP or \fBset +o restricted\fP.
-.PP
-These restrictions are enforced after any startup files are read.
-.PP
-.ie \n(zY=1 When a command that is found to be a shell script is executed,
-.el \{ When a command that is found to be a shell script is executed
-(see
-.SM
-.B "COMMAND EXECUTION"
-above),
-\}
-.B rbash
-turns off any restrictions in the shell spawned to execute the
-script.
-.\" end of rbash.1
-.if \n(zY=1 .ig zY
-.SH "SEE ALSO"
-.PD 0
-.TP
-\fIBash Reference Manual\fP, Brian Fox and Chet Ramey
-.TP
-\fIThe Gnu Readline Library\fP, Brian Fox and Chet Ramey
-.TP
-\fIThe Gnu History Library\fP, Brian Fox and Chet Ramey
-.TP
-\fIPortable Operating System Interface (POSIX) Part 2: Shell and Utilities\fP, IEEE --
-http://pubs.opengroup.org/onlinepubs/9699919799/
-.TP
-http://tiswww.case.edu/~chet/bash/POSIX -- a description of posix mode
-.TP
-\fIsh\fP(1), \fIksh\fP(1), \fIcsh\fP(1)
-.TP
-\fIemacs\fP(1), \fIvi\fP(1)
-.TP
-\fIreadline\fP(3)
-.PD
-.SH FILES
-.PD 0
-.TP
-.FN /bin/bash
-The \fBbash\fP executable
-.TP
-.FN /etc/profile
-The systemwide initialization file, executed for login shells
-.TP
-.FN ~/.bash_profile
-The personal initialization file, executed for login shells
-.TP
-.FN ~/.bashrc
-The individual per-interactive-shell startup file
-.TP
-.FN ~/.bash_logout
-The individual login shell cleanup file, executed when a login shell exits
-.TP
-.FN ~/.inputrc
-Individual \fIreadline\fP initialization file
-.PD
-.SH AUTHORS
-Brian Fox, Free Software Foundation
-.br
-bfox@gnu.org
-.PP
-Chet Ramey, Case Western Reserve University
-.br
-chet.ramey@case.edu
-.SH BUG REPORTS
-If you find a bug in
-.B bash,
-you should report it. But first, you should
-make sure that it really is a bug, and that it appears in the latest
-version of
-.BR bash .
-The latest version is always available from
-\fIftp://ftp.gnu.org/pub/gnu/bash/\fP.
-.PP
-Once you have determined that a bug actually exists, use the
-.I bashbug
-command to submit a bug report.
-If you have a fix, you are encouraged to mail that as well!
-Suggestions and `philosophical' bug reports may be mailed
-to \fIbug-bash@gnu.org\fP or posted to the Usenet
-newsgroup
-.BR gnu.bash.bug .
-.PP
-ALL bug reports should include:
-.PP
-.PD 0
-.TP 20
-The version number of \fBbash\fR
-.TP
-The hardware and operating system
-.TP
-The compiler used to compile
-.TP
-A description of the bug behaviour
-.TP
-A short script or `recipe' which exercises the bug
-.PD
-.PP
-.I bashbug
-inserts the first three items automatically into the template
-it provides for filing a bug report.
-.PP
-Comments and bug reports concerning
-this manual page should be directed to
-.IR chet.ramey@case.edu .
-.SH BUGS
-.PP
-It's too big and too slow.
-.PP
-There are some subtle differences between
-.B bash
-and traditional versions of
-.BR sh ,
-mostly because of the
-.SM
-.B POSIX
-specification.
-.PP
-Aliases are confusing in some uses.
-.PP
-Shell builtin commands and functions are not stoppable/restartable.
-.PP
-Compound commands and command sequences of the form `a ; b ; c'
-are not handled gracefully when process suspension is attempted.
-When a process is stopped, the shell immediately executes the next
-command in the sequence.
-It suffices to place the sequence of commands between
-parentheses to force it into a subshell, which may be stopped as
-a unit.
-.PP
-Array variables may not (yet) be exported.
-.PP
-There may be only one active coprocess at a time.
-.zZ
-.zY
+++ /dev/null
-\input texinfo.tex @c -*- texinfo -*-
-@c %**start of header
-@setfilename bashref.info
-@settitle Bash Reference Manual
-
-@include version.texi
-@c %**end of header
-
-@copying
-This text is a brief description of the features that are present in
-the Bash shell (version @value{VERSION}, @value{UPDATED}).
-
-This is Edition @value{EDITION}, last updated @value{UPDATED},
-of @cite{The GNU Bash Reference Manual},
-for @code{Bash}, Version @value{VERSION}.
-
-Copyright @copyright{} 1988--2014 Free Software Foundation, Inc.
-
-@quotation
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
-A copy of the license is included in the section entitled
-``GNU Free Documentation License''.
-@end quotation
-@end copying
-
-@defcodeindex bt
-@defcodeindex rw
-@set BashFeatures
-
-@dircategory Basics
-@direntry
-* Bash: (bash). The GNU Bourne-Again SHell.
-@end direntry
-
-@finalout
-
-@titlepage
-@title Bash Reference Manual
-@subtitle Reference Documentation for Bash
-@subtitle Edition @value{EDITION}, for @code{Bash} Version @value{VERSION}.
-@subtitle @value{UPDATED-MONTH}
-@author Chet Ramey, Case Western Reserve University
-@author Brian Fox, Free Software Foundation
-
-@page
-@vskip 0pt plus 1filll
-@insertcopying
-
-@end titlepage
-
-@contents
-
-@ifnottex
-@node Top, Introduction, (dir), (dir)
-@top Bash Features
-
-This text is a brief description of the features that are present in
-the Bash shell (version @value{VERSION}, @value{UPDATED}).
-The Bash home page is @url{http://www.gnu.org/software/bash/}.
-
-This is Edition @value{EDITION}, last updated @value{UPDATED},
-of @cite{The GNU Bash Reference Manual},
-for @code{Bash}, Version @value{VERSION}.
-
-Bash contains features that appear in other popular shells, and some
-features that only appear in Bash. Some of the shells that Bash has
-borrowed concepts from are the Bourne Shell (@file{sh}), the Korn Shell
-(@file{ksh}), and the C-shell (@file{csh} and its successor,
-@file{tcsh}). The following menu breaks the features up into
-categories, noting which features were inspired by other shells and
-which are specific to Bash.
-
-This manual is meant as a brief introduction to features found in
-Bash. The Bash manual page should be used as the definitive
-reference on shell behavior.
-
-@menu
-* Introduction:: An introduction to the shell.
-* Definitions:: Some definitions used in the rest of this
- manual.
-* Basic Shell Features:: The shell "building blocks".
-* Shell Builtin Commands:: Commands that are a part of the shell.
-* Shell Variables:: Variables used or set by Bash.
-* Bash Features:: Features found only in Bash.
-* Job Control:: What job control is and how Bash allows you
- to use it.
-* Command Line Editing:: Chapter describing the command line
- editing features.
-* Using History Interactively:: Command History Expansion
-* Installing Bash:: How to build and install Bash on your system.
-* Reporting Bugs:: How to report bugs in Bash.
-* Major Differences From The Bourne Shell:: A terse list of the differences
- between Bash and historical
- versions of /bin/sh.
-* GNU Free Documentation License:: Copying and sharing this documentation.
-* Indexes:: Various indexes for this manual.
-@end menu
-@end ifnottex
-
-@node Introduction
-@chapter Introduction
-@menu
-* What is Bash?:: A short description of Bash.
-* What is a shell?:: A brief introduction to shells.
-@end menu
-
-@node What is Bash?
-@section What is Bash?
-
-Bash is the shell, or command language interpreter,
-for the @sc{gnu} operating system.
-The name is an acronym for the @samp{Bourne-Again SHell},
-a pun on Stephen Bourne, the author of the direct ancestor of
-the current Unix shell @code{sh},
-which appeared in the Seventh Edition Bell Labs Research version
-of Unix.
-
-Bash is largely compatible with @code{sh} and incorporates useful
-features from the Korn shell @code{ksh} and the C shell @code{csh}.
-It is intended to be a conformant implementation of the @sc{ieee}
-@sc{posix} Shell and Tools portion of the @sc{ieee} @sc{posix}
-specification (@sc{ieee} Standard 1003.1).
-It offers functional improvements over @code{sh} for both interactive and
-programming use.
-
-While the @sc{gnu} operating system provides other shells, including
-a version of @code{csh}, Bash is the default shell.
-Like other @sc{gnu} software, Bash is quite portable. It currently runs
-on nearly every version of Unix and a few other operating systems @minus{}
-independently-supported ports exist for @sc{ms-dos}, @sc{os/2},
-and Windows platforms.
-
-@node What is a shell?
-@section What is a shell?
-
-At its base, a shell is simply a macro processor that executes
-commands. The term macro processor means functionality where text
-and symbols are expanded to create larger expressions.
-
-A Unix shell is both a command interpreter and a programming
-language. As a command interpreter, the shell provides the user
-interface to the rich set of @sc{gnu} utilities. The programming
-language features allow these utilities to be combined.
-Files containing commands can be created, and become
-commands themselves. These new commands have the same status as
-system commands in directories such as @file{/bin}, allowing users
-or groups to establish custom environments to automate their common
-tasks.
-
-Shells may be used interactively or non-interactively. In
-interactive mode, they accept input typed from the keyboard.
-When executing non-interactively, shells execute commands read
-from a file.
-
-A shell allows execution of @sc{gnu} commands, both synchronously and
-asynchronously.
-The shell waits for synchronous commands to complete before accepting
-more input; asynchronous commands continue to execute in parallel
-with the shell while it reads and executes additional commands.
-The @dfn{redirection} constructs permit
-fine-grained control of the input and output of those commands.
-Moreover, the shell allows control over the contents of commands'
-environments.
-
-Shells also provide a small set of built-in
-commands (@dfn{builtins}) implementing functionality impossible
-or inconvenient to obtain via separate utilities.
-For example, @code{cd}, @code{break}, @code{continue}, and
-@code{exec} cannot be implemented outside of the shell because
-they directly manipulate the shell itself.
-The @code{history}, @code{getopts}, @code{kill}, or @code{pwd}
-builtins, among others, could be implemented in separate utilities,
-but they are more convenient to use as builtin commands.
-All of the shell builtins are described in
-subsequent sections.
-
-While executing commands is essential, most of the power (and
-complexity) of shells is due to their embedded programming
-languages. Like any high-level language, the shell provides
-variables, flow control constructs, quoting, and functions.
-
-Shells offer features geared specifically for
-interactive use rather than to augment the programming language.
-These interactive features include job control, command line
-editing, command history and aliases. Each of these features is
-described in this manual.
-
-@node Definitions
-@chapter Definitions
-These definitions are used throughout the remainder of this manual.
-
-@table @code
-
-@item POSIX
-@cindex POSIX
-A family of open system standards based on Unix. Bash
-is primarily concerned with the Shell and Utilities portion of the
-@sc{posix} 1003.1 standard.
-
-@item blank
-A space or tab character.
-
-@item builtin
-@cindex builtin
-A command that is implemented internally by the shell itself, rather
-than by an executable program somewhere in the file system.
-
-@item control operator
-@cindex control operator
-A @code{token} that performs a control function. It is a @code{newline}
-or one of the following:
-@samp{||}, @samp{&&}, @samp{&}, @samp{;}, @samp{;;},
-@samp{|}, @samp{|&}, @samp{(}, or @samp{)}.
-
-@item exit status
-@cindex exit status
-The value returned by a command to its caller. The value is restricted
-to eight bits, so the maximum value is 255.
-
-@item field
-@cindex field
-A unit of text that is the result of one of the shell expansions. After
-expansion, when executing a command, the resulting fields are used as
-the command name and arguments.
-
-@item filename
-@cindex filename
-A string of characters used to identify a file.
-
-@item job
-@cindex job
-A set of processes comprising a pipeline, and any processes descended
-from it, that are all in the same process group.
-
-@item job control
-@cindex job control
-A mechanism by which users can selectively stop (suspend) and restart
-(resume) execution of processes.
-
-@item metacharacter
-@cindex metacharacter
-A character that, when unquoted, separates words. A metacharacter is
-a @code{blank} or one of the following characters:
-@samp{|}, @samp{&}, @samp{;}, @samp{(}, @samp{)}, @samp{<}, or
-@samp{>}.
-
-@item name
-@cindex name
-@cindex identifier
-A @code{word} consisting solely of letters, numbers, and underscores,
-and beginning with a letter or underscore. @code{Name}s are used as
-shell variable and function names.
-Also referred to as an @code{identifier}.
-
-@item operator
-@cindex operator, shell
-A @code{control operator} or a @code{redirection operator}.
-@xref{Redirections}, for a list of redirection operators.
-Operators contain at least one unquoted @code{metacharacter}.
-
-@item process group
-@cindex process group
-A collection of related processes each having the same process
-group @sc{id}.
-
-@item process group ID
-@cindex process group ID
-A unique identifier that represents a @code{process group}
-during its lifetime.
-
-@item reserved word
-@cindex reserved word
-A @code{word} that has a special meaning to the shell. Most reserved
-words introduce shell flow control constructs, such as @code{for} and
-@code{while}.
-
-@item return status
-@cindex return status
-A synonym for @code{exit status}.
-
-@item signal
-@cindex signal
-A mechanism by which a process may be notified by the kernel
-of an event occurring in the system.
-
-@item special builtin
-@cindex special builtin
-A shell builtin command that has been classified as special by the
-@sc{posix} standard.
-
-@item token
-@cindex token
-A sequence of characters considered a single unit by the shell.
-It is either a @code{word} or an @code{operator}.
-
-@item word
-@cindex word
-A sequence of characters treated as a unit by the shell.
-Words may not include unquoted @code{metacharacters}.
-@end table
-
-@node Basic Shell Features
-@chapter Basic Shell Features
-@cindex Bourne shell
-
-Bash is an acronym for @samp{Bourne-Again SHell}.
-The Bourne shell is
-the traditional Unix shell originally written by Stephen Bourne.
-All of the Bourne shell builtin commands are available in Bash,
-The rules for evaluation and quoting are taken from the @sc{posix}
-specification for the `standard' Unix shell.
-
-This chapter briefly summarizes the shell's `building blocks':
-commands, control structures, shell functions, shell @i{parameters},
-shell expansions,
-@i{redirections}, which are a way to direct input and output from
-and to named files, and how the shell executes commands.
-
-@menu
-* Shell Syntax:: What your input means to the shell.
-* Shell Commands:: The types of commands you can use.
-* Shell Functions:: Grouping commands by name.
-* Shell Parameters:: How the shell stores values.
-* Shell Expansions:: How Bash expands parameters and the various
- expansions available.
-* Redirections:: A way to control where input and output go.
-* Executing Commands:: What happens when you run a command.
-* Shell Scripts:: Executing files of shell commands.
-@end menu
-
-@node Shell Syntax
-@section Shell Syntax
-@menu
-* Shell Operation:: The basic operation of the shell.
-* Quoting:: How to remove the special meaning from characters.
-* Comments:: How to specify comments.
-@end menu
-
-When the shell reads input, it proceeds through a
-sequence of operations. If the input indicates the beginning of a
-comment, the shell ignores the comment symbol (@samp{#}), and the rest
-of that line.
-
-Otherwise, roughly speaking, the shell reads its input and
-divides the input into words and operators, employing the quoting rules
-to select which meanings to assign various words and characters.
-
-The shell then parses these tokens into commands and other constructs,
-removes the special meaning of certain words or characters, expands
-others, redirects input and output as needed, executes the specified
-command, waits for the command's exit status, and makes that exit status
-available for further inspection or processing.
-
-@node Shell Operation
-@subsection Shell Operation
-
-The following is a brief description of the shell's operation when it
-reads and executes a command. Basically, the shell does the
-following:
-
-@enumerate
-@item
-Reads its input from a file (@pxref{Shell Scripts}), from a string
-supplied as an argument to the @option{-c} invocation option
-(@pxref{Invoking Bash}), or from the user's terminal.
-
-@item
-Breaks the input into words and operators, obeying the quoting rules
-described in @ref{Quoting}. These tokens are separated by
-@code{metacharacters}. Alias expansion is performed by this step
-(@pxref{Aliases}).
-
-@item
-Parses the tokens into simple and compound commands
-(@pxref{Shell Commands}).
-
-@item
-Performs the various shell expansions (@pxref{Shell Expansions}), breaking
-the expanded tokens into lists of filenames (@pxref{Filename Expansion})
-and commands and arguments.
-
-@item
-Performs any necessary redirections (@pxref{Redirections}) and removes
-the redirection operators and their operands from the argument list.
-
-@item
-Executes the command (@pxref{Executing Commands}).
-
-@item
-Optionally waits for the command to complete and collects its exit
-status (@pxref{Exit Status}).
-
-@end enumerate
-
-@node Quoting
-@subsection Quoting
-@cindex quoting
-@menu
-* Escape Character:: How to remove the special meaning from a single
- character.
-* Single Quotes:: How to inhibit all interpretation of a sequence
- of characters.
-* Double Quotes:: How to suppress most of the interpretation of a
- sequence of characters.
-* ANSI-C Quoting:: How to expand ANSI-C sequences in quoted strings.
-* Locale Translation:: How to translate strings into different languages.
-@end menu
-
-Quoting is used to remove the special meaning of certain
-characters or words to the shell. Quoting can be used to
-disable special treatment for special characters, to prevent
-reserved words from being recognized as such, and to prevent
-parameter expansion.
-
-Each of the shell metacharacters (@pxref{Definitions})
-has special meaning to the shell and must be quoted if it is to
-represent itself.
-When the command history expansion facilities are being used
-(@pxref{History Interaction}), the
-@var{history expansion} character, usually @samp{!}, must be quoted
-to prevent history expansion. @xref{Bash History Facilities}, for
-more details concerning history expansion.
-
-There are three quoting mechanisms: the
-@var{escape character}, single quotes, and double quotes.
-
-@node Escape Character
-@subsubsection Escape Character
-A non-quoted backslash @samp{\} is the Bash escape character.
-It preserves the literal value of the next character that follows,
-with the exception of @code{newline}. If a @code{\newline} pair
-appears, and the backslash itself is not quoted, the @code{\newline}
-is treated as a line continuation (that is, it is removed from
-the input stream and effectively ignored).
-
-@node Single Quotes
-@subsubsection Single Quotes
-
-Enclosing characters in single quotes (@samp{'}) preserves the literal value
-of each character within the quotes. A single quote may not occur
-between single quotes, even when preceded by a backslash.
-
-@node Double Quotes
-@subsubsection Double Quotes
-
-Enclosing characters in double quotes (@samp{"}) preserves the literal value
-of all characters within the quotes, with the exception of
-@samp{$}, @samp{`}, @samp{\},
-and, when history expansion is enabled, @samp{!}.
-The characters @samp{$} and @samp{`}
-retain their special meaning within double quotes (@pxref{Shell Expansions}).
-The backslash retains its special meaning only when followed by one of
-the following characters:
-@samp{$}, @samp{`}, @samp{"}, @samp{\}, or @code{newline}.
-Within double quotes, backslashes that are followed by one of these
-characters are removed. Backslashes preceding characters without a
-special meaning are left unmodified.
-A double quote may be quoted within double quotes by preceding it with
-a backslash.
-If enabled, history expansion will be performed unless an @samp{!}
-appearing in double quotes is escaped using a backslash.
-The backslash preceding the @samp{!} is not removed.
-
-The special parameters @samp{*} and @samp{@@} have special meaning
-when in double quotes (@pxref{Shell Parameter Expansion}).
-
-@node ANSI-C Quoting
-@subsubsection ANSI-C Quoting
-@cindex quoting, ANSI
-
-Words of the form @code{$'@var{string}'} are treated specially. The
-word expands to @var{string}, with backslash-escaped characters replaced
-as specified by the ANSI C standard. Backslash escape sequences, if
-present, are decoded as follows:
-
-@table @code
-@item \a
-alert (bell)
-@item \b
-backspace
-@item \e
-@itemx \E
-an escape character (not ANSI C)
-@item \f
-form feed
-@item \n
-newline
-@item \r
-carriage return
-@item \t
-horizontal tab
-@item \v
-vertical tab
-@item \\
-backslash
-@item \'
-single quote
-@item \"
-double quote
-@item \@var{nnn}
-the eight-bit character whose value is the octal value @var{nnn}
-(one to three digits)
-@item \x@var{HH}
-the eight-bit character whose value is the hexadecimal value @var{HH}
-(one or two hex digits)
-@item \u@var{HHHH}
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-@var{HHHH} (one to four hex digits)
-@item \U@var{HHHHHHHH}
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-@var{HHHHHHHH} (one to eight hex digits)
-@item \c@var{x}
-a control-@var{x} character
-@end table
-
-@noindent
-The expanded result is single-quoted, as if the dollar sign had not
-been present.
-
-@node Locale Translation
-@subsubsection Locale-Specific Translation
-@cindex localization
-@cindex internationalization
-@cindex native languages
-@cindex translation, native languages
-
-A double-quoted string preceded by a dollar sign (@samp{$}) will cause
-the string to be translated according to the current locale.
-If the current locale is @code{C} or @code{POSIX}, the dollar sign
-is ignored.
-If the string is translated and replaced, the replacement is
-double-quoted.
-
-@vindex LC_MESSAGES
-@vindex TEXTDOMAIN
-@vindex TEXTDOMAINDIR
-Some systems use the message catalog selected by the @env{LC_MESSAGES}
-shell variable. Others create the name of the message catalog from the
-value of the @env{TEXTDOMAIN} shell variable, possibly adding a
-suffix of @samp{.mo}. If you use the @env{TEXTDOMAIN} variable, you
-may need to set the @env{TEXTDOMAINDIR} variable to the location of
-the message catalog files. Still others use both variables in this
-fashion:
-@env{TEXTDOMAINDIR}/@env{LC_MESSAGES}/LC_MESSAGES/@env{TEXTDOMAIN}.mo.
-
-@node Comments
-@subsection Comments
-@cindex comments, shell
-
-In a non-interactive shell, or an interactive shell in which the
-@code{interactive_comments} option to the @code{shopt}
-builtin is enabled (@pxref{The Shopt Builtin}),
-a word beginning with @samp{#}
-causes that word and all remaining characters on that line to
-be ignored. An interactive shell without the @code{interactive_comments}
-option enabled does not allow comments. The @code{interactive_comments}
-option is on by default in interactive shells.
-@xref{Interactive Shells}, for a description of what makes
-a shell interactive.
-
-@node Shell Commands
-@section Shell Commands
-@cindex commands, shell
-
-A simple shell command such as @code{echo a b c} consists of the command
-itself followed by arguments, separated by spaces.
-
-More complex shell commands are composed of simple commands arranged together
-in a variety of ways: in a pipeline in which the output of one command
-becomes the input of a second, in a loop or conditional construct, or in
-some other grouping.
-
-@menu
-* Simple Commands:: The most common type of command.
-* Pipelines:: Connecting the input and output of several
- commands.
-* Lists:: How to execute commands sequentially.
-* Compound Commands:: Shell commands for control flow.
-* Coprocesses:: Two-way communication between commands.
-* GNU Parallel:: Running commands in parallel.
-@end menu
-
-@node Simple Commands
-@subsection Simple Commands
-@cindex commands, simple
-
-A simple command is the kind of command encountered most often.
-It's just a sequence of words separated by @code{blank}s, terminated
-by one of the shell's control operators (@pxref{Definitions}). The
-first word generally specifies a command to be executed, with the
-rest of the words being that command's arguments.
-
-The return status (@pxref{Exit Status}) of a simple command is
-its exit status as provided
-by the @sc{posix} 1003.1 @code{waitpid} function, or 128+@var{n} if
-the command was terminated by signal @var{n}.
-
-@node Pipelines
-@subsection Pipelines
-@cindex pipeline
-@cindex commands, pipelines
-
-A @code{pipeline} is a sequence of one or more commands separated by
-one of the control operators @samp{|} or @samp{|&}.
-
-@rwindex time
-@rwindex !
-@cindex command timing
-The format for a pipeline is
-@example
-[time [-p]] [!] @var{command1} [ | or |& @var{command2} ] @dots{}
-@end example
-
-@noindent
-The output of each command in the pipeline is connected via a pipe
-to the input of the next command.
-That is, each command reads the previous command's output. This
-connection is performed before any redirections specified by the
-command.
-
-If @samp{|&} is used, @var{command1}'s standard error, in addition to
-its standard output, is connected to
-@var{command2}'s standard input through the pipe;
-it is shorthand for @code{2>&1 |}.
-This implicit redirection of the standard error to the standard output is
-performed after any redirections specified by the command.
-
-The reserved word @code{time} causes timing statistics
-to be printed for the pipeline once it finishes.
-The statistics currently consist of elapsed (wall-clock) time and
-user and system time consumed by the command's execution.
-The @option{-p} option changes the output format to that specified
-by @sc{posix}.
-When the shell is in @sc{posix} mode (@pxref{Bash POSIX Mode}),
-it does not recognize @code{time} as a reserved word if the next
-token begins with a @samp{-}.
-The @env{TIMEFORMAT} variable may be set to a format string that
-specifies how the timing information should be displayed.
-@xref{Bash Variables}, for a description of the available formats.
-The use of @code{time} as a reserved word permits the timing of
-shell builtins, shell functions, and pipelines. An external
-@code{time} command cannot time these easily.
-
-When the shell is in @sc{posix} mode (@pxref{Bash POSIX Mode}), @code{time}
-may be followed by a newline. In this case, the shell displays the
-total user and system time consumed by the shell and its children.
-The @env{TIMEFORMAT} variable may be used to specify the format of
-the time information.
-
-If the pipeline is not executed asynchronously (@pxref{Lists}), the
-shell waits for all commands in the pipeline to complete.
-
-Each command in a pipeline is executed in its own subshell
-(@pxref{Command Execution Environment}). The exit
-status of a pipeline is the exit status of the last command in the
-pipeline, unless the @code{pipefail} option is enabled
-(@pxref{The Set Builtin}).
-If @code{pipefail} is enabled, the pipeline's return status is the
-value of the last (rightmost) command to exit with a non-zero status,
-or zero if all commands exit successfully.
-If the reserved word @samp{!} precedes the pipeline, the
-exit status is the logical negation of the exit status as described
-above.
-The shell waits for all commands in the pipeline to terminate before
-returning a value.
-
-@node Lists
-@subsection Lists of Commands
-@cindex commands, lists
-
-A @code{list} is a sequence of one or more pipelines separated by one
-of the operators @samp{;}, @samp{&}, @samp{&&}, or @samp{||},
-and optionally terminated by one of @samp{;}, @samp{&}, or a
-@code{newline}.
-
-Of these list operators, @samp{&&} and @samp{||}
-have equal precedence, followed by @samp{;} and @samp{&},
-which have equal precedence.
-
-A sequence of one or more newlines may appear in a @code{list}
-to delimit commands, equivalent to a semicolon.
-
-If a command is terminated by the control operator @samp{&},
-the shell executes the command asynchronously in a subshell.
-This is known as executing the command in the @var{background}.
-The shell does not wait for the command to finish, and the return
-status is 0 (true).
-When job control is not active (@pxref{Job Control}),
-the standard input for asynchronous commands, in the absence of any
-explicit redirections, is redirected from @code{/dev/null}.
-
-Commands separated by a @samp{;} are executed sequentially; the shell
-waits for each command to terminate in turn. The return status is the
-exit status of the last command executed.
-
-@sc{and} and @sc{or} lists are sequences of one or more pipelines
-separated by the control operators @samp{&&} and @samp{||},
-respectively. @sc{and} and @sc{or} lists are executed with left
-associativity.
-
-An @sc{and} list has the form
-@example
-@var{command1} && @var{command2}
-@end example
-
-@noindent
-@var{command2} is executed if, and only if, @var{command1}
-returns an exit status of zero.
-
-An @sc{or} list has the form
-@example
-@var{command1} || @var{command2}
-@end example
-
-@noindent
-@var{command2} is executed if, and only if, @var{command1}
-returns a non-zero exit status.
-
-The return status of
-@sc{and} and @sc{or} lists is the exit status of the last command
-executed in the list.
-
-@node Compound Commands
-@subsection Compound Commands
-@cindex commands, compound
-
-@menu
-* Looping Constructs:: Shell commands for iterative action.
-* Conditional Constructs:: Shell commands for conditional execution.
-* Command Grouping:: Ways to group commands.
-@end menu
-
-Compound commands are the shell programming constructs.
-Each construct begins with a reserved word or control operator and is
-terminated by a corresponding reserved word or operator.
-Any redirections (@pxref{Redirections}) associated with a compound command
-apply to all commands within that compound command unless explicitly overridden.
-
-In most cases a list of commands in a compound command's description may be
-separated from the rest of the command by one or more newlines, and may be
-followed by a newline in place of a semicolon.
-
-Bash provides looping constructs, conditional commands, and mechanisms
-to group commands and execute them as a unit.
-
-@node Looping Constructs
-@subsubsection Looping Constructs
-@cindex commands, looping
-
-Bash supports the following looping constructs.
-
-Note that wherever a @samp{;} appears in the description of a
-command's syntax, it may be replaced with one or more newlines.
-
-@table @code
-@item until
-@rwindex until
-@rwindex do
-@rwindex done
-The syntax of the @code{until} command is:
-
-@example
-until @var{test-commands}; do @var{consequent-commands}; done
-@end example
-
-Execute @var{consequent-commands} as long as
-@var{test-commands} has an exit status which is not zero.
-The return status is the exit status of the last command executed
-in @var{consequent-commands}, or zero if none was executed.
-
-@item while
-@rwindex while
-The syntax of the @code{while} command is:
-
-@example
-while @var{test-commands}; do @var{consequent-commands}; done
-@end example
-
-Execute @var{consequent-commands} as long as
-@var{test-commands} has an exit status of zero.
-The return status is the exit status of the last command executed
-in @var{consequent-commands}, or zero if none was executed.
-
-@item for
-@rwindex for
-The syntax of the @code{for} command is:
-
-@example
-for @var{name} [ [in [@var{words} @dots{}] ] ; ] do @var{commands}; done
-@end example
-
-Expand @var{words}, and execute @var{commands} once for each member
-in the resultant list, with @var{name} bound to the current member.
-If @samp{in @var{words}} is not present, the @code{for} command
-executes the @var{commands} once for each positional parameter that is
-set, as if @samp{in "$@@"} had been specified
-(@pxref{Special Parameters}).
-The return status is the exit status of the last command that executes.
-If there are no items in the expansion of @var{words}, no commands are
-executed, and the return status is zero.
-
-An alternate form of the @code{for} command is also supported:
-
-@example
-for (( @var{expr1} ; @var{expr2} ; @var{expr3} )) ; do @var{commands} ; done
-@end example
-
-First, the arithmetic expression @var{expr1} is evaluated according
-to the rules described below (@pxref{Shell Arithmetic}).
-The arithmetic expression @var{expr2} is then evaluated repeatedly
-until it evaluates to zero.
-Each time @var{expr2} evaluates to a non-zero value, @var{commands} are
-executed and the arithmetic expression @var{expr3} is evaluated.
-If any expression is omitted, it behaves as if it evaluates to 1.
-The return value is the exit status of the last command in @var{commands}
-that is executed, or false if any of the expressions is invalid.
-@end table
-
-The @code{break} and @code{continue} builtins (@pxref{Bourne Shell Builtins})
-may be used to control loop execution.
-
-@node Conditional Constructs
-@subsubsection Conditional Constructs
-@cindex commands, conditional
-
-@table @code
-@item if
-@rwindex if
-@rwindex then
-@rwindex else
-@rwindex elif
-@rwindex fi
-The syntax of the @code{if} command is:
-
-@example
-if @var{test-commands}; then
- @var{consequent-commands};
-[elif @var{more-test-commands}; then
- @var{more-consequents};]
-[else @var{alternate-consequents};]
-fi
-@end example
-
-The @var{test-commands} list is executed, and if its return status is zero,
-the @var{consequent-commands} list is executed.
-If @var{test-commands} returns a non-zero status, each @code{elif} list
-is executed in turn, and if its exit status is zero,
-the corresponding @var{more-consequents} is executed and the
-command completes.
-If @samp{else @var{alternate-consequents}} is present, and
-the final command in the final @code{if} or @code{elif} clause
-has a non-zero exit status, then @var{alternate-consequents} is executed.
-The return status is the exit status of the last command executed, or
-zero if no condition tested true.
-
-@item case
-@rwindex case
-@rwindex in
-@rwindex esac
-The syntax of the @code{case} command is:
-
-@example
-case @var{word} in [ [(] @var{pattern} [| @var{pattern}]@dots{}) @var{command-list} ;;]@dots{} esac
-@end example
-
-@code{case} will selectively execute the @var{command-list} corresponding to
-the first @var{pattern} that matches @var{word}.
-If the shell option @code{nocasematch}
-(see the description of @code{shopt} in @ref{The Shopt Builtin})
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-The @samp{|} is used to separate multiple patterns, and the @samp{)}
-operator terminates a pattern list.
-A list of patterns and an associated command-list is known
-as a @var{clause}.
-
-Each clause must be terminated with @samp{;;}, @samp{;&}, or @samp{;;&}.
-The @var{word} undergoes tilde expansion, parameter expansion, command
-substitution, arithmetic expansion, and quote removal before matching is
-attempted. Each @var{pattern} undergoes tilde expansion, parameter
-expansion, command substitution, and arithmetic expansion.
-
-There may be an arbitrary number of @code{case} clauses, each terminated
-by a @samp{;;}, @samp{;&}, or @samp{;;&}.
-The first pattern that matches determines the
-command-list that is executed.
-It's a common idiom to use @samp{*} as the final pattern to define the
-default case, since that pattern will always match.
-
-Here is an example using @code{case} in a script that could be used to
-describe one interesting feature of an animal:
-
-@example
-echo -n "Enter the name of an animal: "
-read ANIMAL
-echo -n "The $ANIMAL has "
-case $ANIMAL in
- horse | dog | cat) echo -n "four";;
- man | kangaroo ) echo -n "two";;
- *) echo -n "an unknown number of";;
-esac
-echo " legs."
-@end example
-
-@noindent
-
-If the @samp{;;} operator is used, no subsequent matches are attempted after
-the first pattern match.
-Using @samp{;&} in place of @samp{;;} causes execution to continue with
-the @var{command-list} associated with the next clause, if any.
-Using @samp{;;&} in place of @samp{;;} causes the shell to test the patterns
-in the next clause, if any, and execute any associated @var{command-list}
-on a successful match.
-
-The return status is zero if no @var{pattern} is matched. Otherwise, the
-return status is the exit status of the @var{command-list} executed.
-
-@item select
-@rwindex select
-
-The @code{select} construct allows the easy generation of menus.
-It has almost the same syntax as the @code{for} command:
-
-@example
-select @var{name} [in @var{words} @dots{}]; do @var{commands}; done
-@end example
-
-The list of words following @code{in} is expanded, generating a list
-of items. The set of expanded words is printed on the standard
-error output stream, each preceded by a number. If the
-@samp{in @var{words}} is omitted, the positional parameters are printed,
-as if @samp{in "$@@"} had been specified.
-The @env{PS3} prompt is then displayed and a line is read from the
-standard input.
-If the line consists of a number corresponding to one of the displayed
-words, then the value of @var{name} is set to that word.
-If the line is empty, the words and prompt are displayed again.
-If @code{EOF} is read, the @code{select} command completes.
-Any other value read causes @var{name} to be set to null.
-The line read is saved in the variable @env{REPLY}.
-
-The @var{commands} are executed after each selection until a
-@code{break} command is executed, at which
-point the @code{select} command completes.
-
-Here is an example that allows the user to pick a filename from the
-current directory, and displays the name and index of the file
-selected.
-
-@example
-select fname in *;
-do
- echo you picked $fname \($REPLY\)
- break;
-done
-@end example
-
-@item ((@dots{}))
-@example
-(( @var{expression} ))
-@end example
-
-The arithmetic @var{expression} is evaluated according to the rules
-described below (@pxref{Shell Arithmetic}).
-If the value of the expression is non-zero, the return status is 0;
-otherwise the return status is 1. This is exactly equivalent to
-@example
-let "@var{expression}"
-@end example
-@noindent
-@xref{Bash Builtins}, for a full description of the @code{let} builtin.
-
-@item [[@dots{}]]
-@rwindex [[
-@rwindex ]]
-@example
-[[ @var{expression} ]]
-@end example
-
-Return a status of 0 or 1 depending on the evaluation of
-the conditional expression @var{expression}.
-Expressions are composed of the primaries described below in
-@ref{Bash Conditional Expressions}.
-Word splitting and filename expansion are not performed on the words
-between the @code{[[} and @code{]]}; tilde expansion, parameter and
-variable expansion, arithmetic expansion, command substitution, process
-substitution, and quote removal are performed.
-Conditional operators such as @samp{-f} must be unquoted to be recognized
-as primaries.
-
-When used with @code{[[}, the @samp{<} and @samp{>} operators sort
-lexicographically using the current locale.
-
-When the @samp{==} and @samp{!=} operators are used, the string to the
-right of the operator is considered a pattern and matched according
-to the rules described below in @ref{Pattern Matching},
-as if the @code{extglob} shell option were enabled.
-The @samp{=} operator is identical to @samp{==}.
-If the shell option @code{nocasematch}
-(see the description of @code{shopt} in @ref{The Shopt Builtin})
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-The return value is 0 if the string matches (@samp{==}) or does not
-match (@samp{!=})the pattern, and 1 otherwise.
-Any part of the pattern may be quoted to force the quoted portion
-to be matched as a string.
-
-An additional binary operator, @samp{=~}, is available, with the same
-precedence as @samp{==} and @samp{!=}.
-When it is used, the string to the right of the operator is considered
-an extended regular expression and matched accordingly (as in @i{regex}3)).
-The return value is 0 if the string matches
-the pattern, and 1 otherwise.
-If the regular expression is syntactically incorrect, the conditional
-expression's return value is 2.
-If the shell option @code{nocasematch}
-(see the description of @code{shopt} in @ref{The Shopt Builtin})
-is enabled, the match is performed without regard to the case
-of alphabetic characters.
-Any part of the pattern may be quoted to force the quoted portion
-to be matched as a string.
-Bracket expressions in regular expressions must be treated carefully,
-since normal quoting characters lose their meanings between brackets.
-If the pattern is stored in a shell variable, quoting the variable
-expansion forces the entire pattern to be matched as a string.
-Substrings matched by parenthesized subexpressions within the regular
-expression are saved in the array variable @code{BASH_REMATCH}.
-The element of @code{BASH_REMATCH} with index 0 is the portion of the string
-matching the entire regular expression.
-The element of @code{BASH_REMATCH} with index @var{n} is the portion of the
-string matching the @var{n}th parenthesized subexpression.
-
-For example, the following will match a line
-(stored in the shell variable @var{line})
-if there is a sequence of characters in the value consisting of
-any number, including zero, of
-space characters, zero or one instances of @samp{a}, then a @samp{b}:
-@example
-[[ $line =~ [[:space:]]*(a)?b ]]
-@end example
-
-@noindent
-That means values like @samp{aab} and @samp{ aaaaaab} will match, as
-will a line containing a @samp{b} anywhere in its value.
-
-Storing the regular expression in a shell variable is often a useful
-way to avoid problems with quoting characters that are special to the
-shell.
-It is sometimes difficult to specify a regular expression literally
-without using quotes, or to keep track of the quoting used by regular
-expressions while paying attention to the shell's quote removal.
-Using a shell variable to store the pattern decreases these problems.
-For example, the following is equivalent to the above:
-@example
-pattern='[[:space:]]*(a)?b'
-[[ $line =~ $pattern ]]
-@end example
-
-@noindent
-If you want to match a character that's special to the regular expression
-grammar, it has to be quoted to remove its special meaning.
-This means that in the pattern @samp{xxx.txt}, the @samp{.} matches any
-character in the string (its usual regular expression meaning), but in the
-pattern @samp{"xxx.txt"} it can only match a literal @samp{.}.
-Shell programmers should take special care with backslashes, since backslashes
-are used both by the shell and regular expressions to remove the special
-meaning from the following character.
-The following two sets of commands are @emph{not} equivalent:
-@example
-pattern='\.'
-
-[[ . =~ $pattern ]]
-[[ . =~ \. ]]
-
-[[ . =~ "$pattern" ]]
-[[ . =~ '\.' ]]
-@end example
-
-@noindent
-The first two matches will succeed, but the second two will not, because
-in the second two the backslash will be part of the pattern to be matched.
-In the first two examples, the backslash removes the special meaning from
-@samp{.}, so the literal @samp{.} matches.
-If the string in the first examples were anything other than @samp{.}, say
-@samp{a}, the pattern would not match, because the quoted @samp{.} in the
-pattern loses its special meaning of matching any single character.
-
-Expressions may be combined using the following operators, listed
-in decreasing order of precedence:
-
-@table @code
-@item ( @var{expression} )
-Returns the value of @var{expression}.
-This may be used to override the normal precedence of operators.
-
-@item ! @var{expression}
-True if @var{expression} is false.
-
-@item @var{expression1} && @var{expression2}
-True if both @var{expression1} and @var{expression2} are true.
-
-@item @var{expression1} || @var{expression2}
-True if either @var{expression1} or @var{expression2} is true.
-@end table
-
-@noindent
-The @code{&&} and @code{||} operators do not evaluate @var{expression2} if the
-value of @var{expression1} is sufficient to determine the return
-value of the entire conditional expression.
-@end table
-
-@node Command Grouping
-@subsubsection Grouping Commands
-@cindex commands, grouping
-
-Bash provides two ways to group a list of commands to be executed
-as a unit. When commands are grouped, redirections may be applied
-to the entire command list. For example, the output of all the
-commands in the list may be redirected to a single stream.
-
-@table @code
-@item ()
-@example
-( @var{list} )
-@end example
-
-Placing a list of commands between parentheses causes a subshell
-environment to be created (@pxref{Command Execution Environment}), and each
-of the commands in @var{list} to be executed in that subshell. Since the
-@var{list} is executed in a subshell, variable assignments do not remain in
-effect after the subshell completes.
-
-@item @{@}
-@rwindex @{
-@rwindex @}
-@example
-@{ @var{list}; @}
-@end example
-
-Placing a list of commands between curly braces causes the list to
-be executed in the current shell context. No subshell is created.
-The semicolon (or newline) following @var{list} is required.
-@end table
-
-In addition to the creation of a subshell, there is a subtle difference
-between these two constructs due to historical reasons. The braces
-are @code{reserved words}, so they must be separated from the @var{list}
-by @code{blank}s or other shell metacharacters.
-The parentheses are @code{operators}, and are
-recognized as separate tokens by the shell even if they are not separated
-from the @var{list} by whitespace.
-
-The exit status of both of these constructs is the exit status of
-@var{list}.
-
-@node Coprocesses
-@subsection Coprocesses
-@cindex coprocess
-
-A @code{coprocess} is a shell command preceded by the @code{coproc}
-reserved word.
-A coprocess is executed asynchronously in a subshell, as if the command
-had been terminated with the @samp{&} control operator, with a two-way pipe
-established between the executing shell and the coprocess.
-
-The format for a coprocess is:
-@example
-coproc [@var{NAME}] @var{command} [@var{redirections}]
-@end example
-
-@noindent
-This creates a coprocess named @var{NAME}.
-If @var{NAME} is not supplied, the default name is @var{COPROC}.
-@var{NAME} must not be supplied if @var{command} is a simple
-command (@pxref{Simple Commands}); otherwise, it is interpreted as
-the first word of the simple command.
-
-When the coprocess is executed, the shell creates an array variable
-(@pxref{Arrays})
-named @env{NAME} in the context of the executing shell.
-The standard output of @var{command}
-is connected via a pipe to a file descriptor in the executing shell,
-and that file descriptor is assigned to @env{NAME}[0].
-The standard input of @var{command}
-is connected via a pipe to a file descriptor in the executing shell,
-and that file descriptor is assigned to @env{NAME}[1].
-This pipe is established before any redirections specified by the
-command (@pxref{Redirections}).
-The file descriptors can be utilized as arguments to shell commands
-and redirections using standard word expansions.
-The file descriptors are not available in subshells.
-
-The process ID of the shell spawned to execute the coprocess is
-available as the value of the variable @env{NAME}_PID.
-The @code{wait}
-builtin command may be used to wait for the coprocess to terminate.
-
-Since the coprocess is created as an asynchronous command,
-the @code{coproc} command always returns success.
-The return status of a coprocess is the exit status of @var{command}.
-
-@node GNU Parallel
-@subsection GNU Parallel
-
-There are ways to run commands in parallel that are not built into Bash.
-GNU Parallel is a tool to do just that.
-
-GNU Parallel, as its name suggests, can be used to build and run commands
-in parallel. You may run the same command with different arguments, whether
-they are filenames, usernames, hostnames, or lines read from files. GNU
-Parallel provides shorthand references to many of the most common operations
-(input lines, various portions of the input line, different ways to specify
-the input source, and so on). Parallel can replace @code{xargs} or feed
-commands from its input sources to several different instances of Bash.
-
-For a complete description, refer to the GNU Parallel documentation. A few
-examples should provide a brief introduction to its use.
-
-For example, it is easy to replace @code{xargs} to gzip all html files in the
-current directory and its subdirectories:
-@example
-find . -type f -name '*.html' -print | parallel gzip
-@end example
-@noindent
-If you need to protect special characters such as newlines in file names,
-use find's @option{-print0} option and parallel's @option{-0} option.
-
-You can use Parallel to move files from the current directory when the
-number of files is too large to process with one @code{mv} invocation:
-@example
-ls | parallel mv @{@} destdir
-@end example
-
-As you can see, the @{@} is replaced with each line read from standard input.
-While using @code{ls} will work in most instances, it is not sufficient to
-deal with all filenames.
-If you need to accommodate special characters in filenames, you can use
-
-@example
-find . -depth 1 \! -name '.*' -print0 | parallel -0 mv @{@} destdir
-@end example
-
-@noindent
-as alluded to above.
-
-This will run as many @code{mv} commands as there are files in the current
-directory.
-You can emulate a parallel @code{xargs} by adding the @option{-X} option:
-@example
-find . -depth 1 \! -name '.*' -print0 | parallel -0 -X mv @{@} destdir
-@end example
-
-GNU Parallel can replace certain common idioms that operate on lines read
-from a file (in this case, filenames listed one per line):
-@example
- while IFS= read -r x; do
- do-something1 "$x" "config-$x"
- do-something2 < "$x"
- done < file | process-output
-@end example
-
-@noindent
-with a more compact syntax reminiscent of lambdas:
-@example
-cat list | parallel "do-something1 @{@} config-@{@} ; do-something2 < @{@}" | process-output
-@end example
-
-Parallel provides a built-in mechanism to remove filename extensions, which
-lends itself to batch file transformations or renaming:
-@example
-ls *.gz | parallel -j+0 "zcat @{@} | bzip2 >@{.@}.bz2 && rm @{@}"
-@end example
-@noindent
-This will recompress all files in the current directory with names ending
-in .gz using bzip2, running one job per CPU (-j+0) in parallel.
-(We use @code{ls} for brevity here; using @code{find} as above is more
-robust in the face of filenames containing unexpected characters.)
-Parallel can take arguments from the command line; the above can also be
-written as
-
-@example
-parallel "zcat @{@} | bzip2 >@{.@}.bz2 && rm @{@}" ::: *.gz
-@end example
-
-If a command generates output, you may want to preserve the input order in
-the output. For instance, the following command
-@example
-@{ echo foss.org.my ; echo debian.org; echo freenetproject.org; @} | parallel traceroute
-@end example
-@noindent
-will display as output the traceroute invocation that finishes first.
-Adding the @option{-k} option
-@example
-@{ echo foss.org.my ; echo debian.org; echo freenetproject.org; @} | parallel -k traceroute
-@end example
-@noindent
-will ensure that the output of @code{traceroute foss.org.my} is displayed first.
-
-Finally, Parallel can be used to run a sequence of shell commands in parallel,
-similar to @samp{cat file | bash}.
-It is not uncommon to take a list of filenames, create a series of shell
-commands to operate on them, and feed that list of commnds to a shell.
-Parallel can speed this up. Assuming that @file{file} contains a list of
-shell commands, one per line,
-
-@example
-parallel -j 10 < file
-@end example
-
-@noindent
-will evaluate the commands using the shell (since no explicit command is
-supplied as an argument), in blocks of ten shell jobs at a time.
-
-@node Shell Functions
-@section Shell Functions
-@cindex shell function
-@cindex functions, shell
-
-Shell functions are a way to group commands for later execution
-using a single name for the group. They are executed just like
-a "regular" command.
-When the name of a shell function is used as a simple command name,
-the list of commands associated with that function name is executed.
-Shell functions are executed in the current
-shell context; no new process is created to interpret them.
-
-Functions are declared using this syntax:
-@rwindex function
-@example
-@var{name} () @var{compound-command} [ @var{redirections} ]
-@end example
-
-or
-
-@example
-function @var{name} [()] @var{compound-command} [ @var{redirections} ]
-@end example
-
-This defines a shell function named @var{name}. The reserved
-word @code{function} is optional.
-If the @code{function} reserved
-word is supplied, the parentheses are optional.
-The @var{body} of the function is the compound command
-@var{compound-command} (@pxref{Compound Commands}).
-That command is usually a @var{list} enclosed between @{ and @}, but
-may be any compound command listed above,
-with one exception: If the @code{function} reserved word is used, but the
-parentheses are not supplied, the braces are required.
-@var{compound-command} is executed whenever @var{name} is specified as the
-name of a command.
-When the shell is in @sc{posix} mode (@pxref{Bash POSIX Mode}),
-@var{name} may not be the same as one of the special builtins
-(@pxref{Special Builtins}).
-Any redirections (@pxref{Redirections}) associated with the shell function
-are performed when the function is executed.
-
-A function definition may be deleted using the @option{-f} option to the
-@code{unset} builtin (@pxref{Bourne Shell Builtins}).
-
-The exit status of a function definition is zero unless a syntax error
-occurs or a readonly function with the same name already exists.
-When executed, the exit status of a function is the exit status of the
-last command executed in the body.
-
-Note that for historical reasons, in the most common usage the curly braces
-that surround the body of the function must be separated from the body by
-@code{blank}s or newlines.
-This is because the braces are reserved words and are only recognized
-as such when they are separated from the command list
-by whitespace or another shell metacharacter.
-Also, when using the braces, the @var{list} must be terminated by a semicolon,
-a @samp{&}, or a newline.
-
-When a function is executed, the arguments to the
-function become the positional parameters
-during its execution (@pxref{Positional Parameters}).
-The special parameter @samp{#} that expands to the number of
-positional parameters is updated to reflect the change.
-Special parameter @code{0} is unchanged.
-The first element of the @env{FUNCNAME} variable is set to the
-name of the function while the function is executing.
-
-All other aspects of the shell execution
-environment are identical between a function and its caller
-with these exceptions:
-the @env{DEBUG} and @env{RETURN} traps
-are not inherited unless the function has been given the
-@code{trace} attribute using the @code{declare} builtin or
-the @code{-o functrace} option has been enabled with
-the @code{set} builtin,
-(in which case all functions inherit the @env{DEBUG} and @env{RETURN} traps),
-and the @env{ERR} trap is not inherited unless the @code{-o errtrace}
-shell option has been enabled.
-@xref{Bourne Shell Builtins}, for the description of the
-@code{trap} builtin.
-
-The @env{FUNCNEST} variable, if set to a numeric value greater
-than 0, defines a maximum function nesting level. Function
-invocations that exceed the limit cause the entire command to
-abort.
-
-If the builtin command @code{return}
-is executed in a function, the function completes and
-execution resumes with the next command after the function
-call.
-Any command associated with the @code{RETURN} trap is executed
-before execution resumes.
-When a function completes, the values of the
-positional parameters and the special parameter @samp{#}
-are restored to the values they had prior to the function's
-execution. If a numeric argument is given to @code{return},
-that is the function's return status; otherwise the function's
-return status is the exit status of the last command executed
-before the @code{return}.
-
-Variables local to the function may be declared with the
-@code{local} builtin. These variables are visible only to
-the function and the commands it invokes.
-
-Function names and definitions may be listed with the
-@option{-f} option to the @code{declare} (@code{typeset})
-builtin command (@pxref{Bash Builtins}).
-The @option{-F} option to @code{declare} or @code{typeset}
-will list the function names only
-(and optionally the source file and line number, if the @code{extdebug}
-shell option is enabled).
-Functions may be exported so that subshells
-automatically have them defined with the
-@option{-f} option to the @code{export} builtin
-(@pxref{Bourne Shell Builtins}).
-Note that shell functions and variables with the same name may result
-in multiple identically-named entries in the environment passed to the
-shell's children.
-Care should be taken in cases where this may cause a problem.
-
-Functions may be recursive.
-The @code{FUNCNEST} variable may be used to limit the depth of the
-function call stack and restrict the number of function invocations.
-By default, no limit is placed on the number of recursive calls.
-
-@node Shell Parameters
-@section Shell Parameters
-@cindex parameters
-@cindex variable, shell
-@cindex shell variable
-
-@menu
-* Positional Parameters:: The shell's command-line arguments.
-* Special Parameters:: Parameters denoted by special characters.
-@end menu
-
-A @var{parameter} is an entity that stores values.
-It can be a @code{name}, a number, or one of the special characters
-listed below.
-A @var{variable} is a parameter denoted by a @code{name}.
-A variable has a @var{value} and zero or more @var{attributes}.
-Attributes are assigned using the @code{declare} builtin command
-(see the description of the @code{declare} builtin in @ref{Bash Builtins}).
-
-A parameter is set if it has been assigned a value. The null string is
-a valid value. Once a variable is set, it may be unset only by using
-the @code{unset} builtin command.
-
-A variable may be assigned to by a statement of the form
-@example
-@var{name}=[@var{value}]
-@end example
-@noindent
-If @var{value}
-is not given, the variable is assigned the null string. All
-@var{value}s undergo tilde expansion, parameter and variable expansion,
-command substitution, arithmetic expansion, and quote
-removal (detailed below). If the variable has its @code{integer}
-attribute set, then @var{value}
-is evaluated as an arithmetic expression even if the @code{$((@dots{}))}
-expansion is not used (@pxref{Arithmetic Expansion}).
-Word splitting is not performed, with the exception
-of @code{"$@@"} as explained below.
-Filename expansion is not performed.
-Assignment statements may also appear as arguments to the
-@code{alias},
-@code{declare}, @code{typeset}, @code{export}, @code{readonly},
-and @code{local} builtin commands (@var{declaration} commands).
-When in @sc{posix} mode (@pxref{Bash POSIX Mode}), these builtins may appear
-in a command after one or more instances of the @code{command} builtin
-and retain these assignment statement properties.
-
-In the context where an assignment statement is assigning a value
-to a shell variable or array index (@pxref{Arrays}), the @samp{+=}
-operator can be used to
-append to or add to the variable's previous value.
-This includes arguments to builtin commands such as @code{declare} that
-accept assignment statements (@var{declaration} commands).
-When @samp{+=} is applied to a variable for which the @var{integer} attribute
-has been set, @var{value} is evaluated as an arithmetic expression and
-added to the variable's current value, which is also evaluated.
-When @samp{+=} is applied to an array variable using compound assignment
-(@pxref{Arrays}), the
-variable's value is not unset (as it is when using @samp{=}), and new
-values are appended to the array beginning at one greater than the array's
-maximum index (for indexed arrays), or added as additional key-value pairs
-in an associative array.
-When applied to a string-valued variable, @var{value} is expanded and
-appended to the variable's value.
-
-A variable can be assigned the @var{nameref} attribute using the
-@option{-n} option to the \fBdeclare\fP or \fBlocal\fP builtin commands
-(@pxref{Bash Builtins})
-to create a @var{nameref}, or a reference to another variable.
-This allows variables to be manipulated indirectly.
-Whenever the nameref variable is referenced, assigned to, unset, or has
-its attributes modified (other than the nameref attribute itself), the
-operation is actually performed on the variable specified by the nameref
-variable's value.
-A nameref is commonly used within shell functions to refer to a variable
-whose name is passed as an argument to the function.
-For instance, if a variable name is passed to a shell function as its first
-argument, running
-@example
-declare -n ref=$1
-@end example
-@noindent
-inside the function creates a nameref variable @var{ref} whose value is
-the variable name passed as the first argument.
-References and assignments to @var{ref}, and changes to its attributes,
-are treated as references, assignments, and attribute modifications
-to the variable whose name was passed as @code{$1}.
-
-If the control variable in a @code{for} loop has the nameref attribute,
-the list of words can be a list of shell variables, and a name reference
-will be established for each word in the list, in turn, when the loop is
-executed.
-Array variables cannot be given the nameref attribute.
-However, nameref variables can reference array variables and subscripted
-array variables.
-Namerefs can be unset using the @option{-n} option to the @code{unset} builtin
-(@pxref{Bourne Shell Builtins}).
-Otherwise, if @code{unset} is executed with the name of a nameref variable
-as an argument, the variable referenced by the nameref variable will be unset.
-
-@node Positional Parameters
-@subsection Positional Parameters
-@cindex parameters, positional
-
-A @var{positional parameter} is a parameter denoted by one or more
-digits, other than the single digit @code{0}. Positional parameters are
-assigned from the shell's arguments when it is invoked,
-and may be reassigned using the @code{set} builtin command.
-Positional parameter @code{N} may be referenced as @code{$@{N@}}, or
-as @code{$N} when @code{N} consists of a single digit.
-Positional parameters may not be assigned to with assignment statements.
-The @code{set} and @code{shift} builtins are used to set and
-unset them (@pxref{Shell Builtin Commands}).
-The positional parameters are
-temporarily replaced when a shell function is executed
-(@pxref{Shell Functions}).
-
-When a positional parameter consisting of more than a single
-digit is expanded, it must be enclosed in braces.
-
-@node Special Parameters
-@subsection Special Parameters
-@cindex parameters, special
-
-The shell treats several parameters specially. These parameters may
-only be referenced; assignment to them is not allowed.
-
-@vtable @code
-
-@item *
-@vindex $*
-($*) Expands to the positional parameters, starting from one.
-When the expansion is not within double quotes, each positional parameter
-expands to a separate word.
-In contexts where it is performed, those words
-are subject to further word splitting and pathname expansion.
-When the expansion occurs within double quotes, it expands to a single word
-with the value of each parameter separated by the first character
-of the @env{IFS}
-special variable. That is, @code{"$*"} is equivalent
-to @code{"$1@var{c}$2@var{c}@dots{}"}, where @var{c}
-is the first character of the value of the @code{IFS}
-variable.
-If @env{IFS} is unset, the parameters are separated by spaces.
-If @env{IFS} is null, the parameters are joined without intervening
-separators.
-
-@item @@
-@vindex $@@
-($@@) Expands to the positional parameters, starting from one. When the
-expansion occurs within double quotes, each parameter expands to a
-separate word. That is, @code{"$@@"} is equivalent to
-@code{"$1" "$2" @dots{}}.
-If the double-quoted expansion occurs within a word, the expansion of
-the first parameter is joined with the beginning part of the original
-word, and the expansion of the last parameter is joined with the last
-part of the original word.
-When there are no positional parameters, @code{"$@@"} and
-@code{$@@}
-expand to nothing (i.e., they are removed).
-
-@item #
-@vindex $#
-($#) Expands to the number of positional parameters in decimal.
-
-@item ?
-@vindex $?
-($?) Expands to the exit status of the most recently executed foreground
-pipeline.
-
-@item -
-@vindex $-
-($-, a hyphen.) Expands to the current option flags as specified upon
-invocation, by the @code{set}
-builtin command, or those set by the shell itself
-(such as the @option{-i} option).
-
-@item $
-@vindex $$
-($$) Expands to the process @sc{id} of the shell. In a @code{()} subshell, it
-expands to the process @sc{id} of the invoking shell, not the subshell.
-
-@item !
-@vindex $!
-($!) Expands to the process @sc{id} of the job most recently placed into the
-background, whether executed as an asynchronous command or using
-the @code{bg} builtin (@pxref{Job Control Builtins}).
-
-@item 0
-@vindex $0
-($0) Expands to the name of the shell or shell script. This is set at
-shell initialization. If Bash is invoked with a file of commands
-(@pxref{Shell Scripts}), @code{$0} is set to the name of that file.
-If Bash is started with the @option{-c} option (@pxref{Invoking Bash}),
-then @code{$0} is set to the first argument after the string to be
-executed, if one is present. Otherwise, it is set
-to the filename used to invoke Bash, as given by argument zero.
-
-@item _
-@vindex $_
-($_, an underscore.)
-At shell startup, set to the absolute pathname used to invoke the
-shell or shell script being executed as passed in the environment
-or argument list.
-Subsequently, expands to the last argument to the previous command,
-after expansion.
-Also set to the full pathname used to invoke each command executed
-and placed in the environment exported to that command.
-When checking mail, this parameter holds the name of the mail file.
-@end vtable
-
-@node Shell Expansions
-@section Shell Expansions
-@cindex expansion
-
-Expansion is performed on the command line after it has been split into
-@code{token}s. There are seven kinds of expansion performed:
-
-@itemize @bullet
-@item brace expansion
-@item tilde expansion
-@item parameter and variable expansion
-@item command substitution
-@item arithmetic expansion
-@item word splitting
-@item filename expansion
-@end itemize
-
-@menu
-* Brace Expansion:: Expansion of expressions within braces.
-* Tilde Expansion:: Expansion of the ~ character.
-* Shell Parameter Expansion:: How Bash expands variables to their values.
-* Command Substitution:: Using the output of a command as an argument.
-* Arithmetic Expansion:: How to use arithmetic in shell expansions.
-* Process Substitution:: A way to write and read to and from a
- command.
-* Word Splitting:: How the results of expansion are split into separate
- arguments.
-* Filename Expansion:: A shorthand for specifying filenames matching patterns.
-* Quote Removal:: How and when quote characters are removed from
- words.
-@end menu
-
-The order of expansions is:
-brace expansion;
-tilde expansion, parameter and variable expansion, arithmetic expansion,
-and command substitution (done in a left-to-right fashion);
-word splitting;
-and filename expansion.
-
-On systems that can support it, there is an additional expansion
-available: @var{process substitution}.
-This is performed at the
-same time as tilde, parameter, variable, and arithmetic expansion and
-command substitution.
-
-Only brace expansion, word splitting, and filename expansion
-can change the number of words of the expansion; other expansions
-expand a single word to a single word.
-The only exceptions to this are the expansions of
-@code{"$@@"} (@pxref{Special Parameters}) and @code{"$@{@var{name}[@@]@}"}
-(@pxref{Arrays}).
-
-After all expansions, @code{quote removal} (@pxref{Quote Removal})
-is performed.
-
-@node Brace Expansion
-@subsection Brace Expansion
-@cindex brace expansion
-@cindex expansion, brace
-
-Brace expansion is a mechanism by which arbitrary strings may be generated.
-This mechanism is similar to
-@var{filename expansion} (@pxref{Filename Expansion}),
-but the filenames generated need not exist.
-Patterns to be brace expanded take the form of an optional @var{preamble},
-followed by either a series of comma-separated strings or a sequence expression
-between a pair of braces,
-followed by an optional @var{postscript}.
-The preamble is prefixed to each string contained within the braces, and
-the postscript is then appended to each resulting string, expanding left
-to right.
-
-Brace expansions may be nested.
-The results of each expanded string are not sorted; left to right order
-is preserved.
-For example,
-@example
-bash$ echo a@{d,c,b@}e
-ade ace abe
-@end example
-
-A sequence expression takes the form @code{@{@var{x}..@var{y}[..@var{incr}]@}},
-where @var{x} and @var{y} are either integers or single characters,
-and @var{incr}, an optional increment, is an integer.
-When integers are supplied, the expression expands to each number between
-@var{x} and @var{y}, inclusive.
-Supplied integers may be prefixed with @samp{0} to force each term to have the
-same width.
-When either @var{x} or @var{y} begins with a zero, the shell
-attempts to force all generated terms to contain the same number of digits,
-zero-padding where necessary.
-When characters are supplied, the expression expands to each character
-lexicographically between @var{x} and @var{y}, inclusive,
-using the default C locale.
-Note that both @var{x} and @var{y} must be of the same type.
-When the increment is supplied, it is used as the difference between
-each term. The default increment is 1 or -1 as appropriate.
-
-Brace expansion is performed before any other expansions,
-and any characters special to other expansions are preserved
-in the result. It is strictly textual. Bash
-does not apply any syntactic interpretation to the context of the
-expansion or the text between the braces.
-To avoid conflicts with parameter expansion, the string @samp{$@{}
-is not considered eligible for brace expansion.
-
-A correctly-formed brace expansion must contain unquoted opening
-and closing braces, and at least one unquoted comma or a valid
-sequence expression.
-Any incorrectly formed brace expansion is left unchanged.
-
-A @{ or @samp{,} may be quoted with a backslash to prevent its
-being considered part of a brace expression.
-To avoid conflicts with parameter expansion, the string @samp{$@{}
-is not considered eligible for brace expansion.
-
-This construct is typically used as shorthand when the common
-prefix of the strings to be generated is longer than in the
-above example:
-@example
-mkdir /usr/local/src/bash/@{old,new,dist,bugs@}
-@end example
-or
-@example
-chown root /usr/@{ucb/@{ex,edit@},lib/@{ex?.?*,how_ex@}@}
-@end example
-
-@node Tilde Expansion
-@subsection Tilde Expansion
-@cindex tilde expansion
-@cindex expansion, tilde
-
-If a word begins with an unquoted tilde character (@samp{~}), all of the
-characters up to the first unquoted slash (or all characters,
-if there is no unquoted slash) are considered a @var{tilde-prefix}.
-If none of the characters in the tilde-prefix are quoted, the
-characters in the tilde-prefix following the tilde are treated as a
-possible @var{login name}.
-If this login name is the null string, the tilde is replaced with the
-value of the @env{HOME} shell variable.
-If @env{HOME} is unset, the home directory of the user executing the
-shell is substituted instead.
-Otherwise, the tilde-prefix is replaced with the home directory
-associated with the specified login name.
-
-If the tilde-prefix is @samp{~+}, the value of
-the shell variable @env{PWD} replaces the tilde-prefix.
-If the tilde-prefix is @samp{~-}, the value of the shell variable
-@env{OLDPWD}, if it is set, is substituted.
-
-If the characters following the tilde in the tilde-prefix consist of a
-number @var{N}, optionally prefixed by a @samp{+} or a @samp{-},
-the tilde-prefix is replaced with the
-corresponding element from the directory stack, as it would be displayed
-by the @code{dirs} builtin invoked with the characters following tilde
-in the tilde-prefix as an argument (@pxref{The Directory Stack}).
-If the tilde-prefix, sans the tilde, consists of a number without a
-leading @samp{+} or @samp{-}, @samp{+} is assumed.
-
-If the login name is invalid, or the tilde expansion fails, the word is
-left unchanged.
-
-Each variable assignment is checked for unquoted tilde-prefixes immediately
-following a @samp{:} or the first @samp{=}.
-In these cases, tilde expansion is also performed.
-Consequently, one may use filenames with tildes in assignments to
-@env{PATH}, @env{MAILPATH}, and @env{CDPATH},
-and the shell assigns the expanded value.
-
-The following table shows how Bash treats unquoted tilde-prefixes:
-
-@table @code
-@item ~
-The value of @code{$HOME}
-@item ~/foo
-@file{$HOME/foo}
-
-@item ~fred/foo
-The subdirectory @code{foo} of the home directory of the user
-@code{fred}
-
-@item ~+/foo
-@file{$PWD/foo}
-
-@item ~-/foo
-@file{$@{OLDPWD-'~-'@}/foo}
-
-@item ~@var{N}
-The string that would be displayed by @samp{dirs +@var{N}}
-
-@item ~+@var{N}
-The string that would be displayed by @samp{dirs +@var{N}}
-
-@item ~-@var{N}
-The string that would be displayed by @samp{dirs -@var{N}}
-@end table
-
-@node Shell Parameter Expansion
-@subsection Shell Parameter Expansion
-@cindex parameter expansion
-@cindex expansion, parameter
-
-The @samp{$} character introduces parameter expansion,
-command substitution, or arithmetic expansion. The parameter name
-or symbol to be expanded may be enclosed in braces, which
-are optional but serve to protect the variable to be expanded from
-characters immediately following it which could be
-interpreted as part of the name.
-
-When braces are used, the matching ending brace is the first @samp{@}}
-not escaped by a backslash or within a quoted string, and not within an
-embedded arithmetic expansion, command substitution, or parameter
-expansion.
-
-The basic form of parameter expansion is $@{@var{parameter}@}.
-The value of @var{parameter} is substituted.
-The @var{parameter} is a shell parameter as described above
-(@pxref{Shell Parameters}) or an array reference (@pxref{Arrays}).
-The braces are required when @var{parameter}
-is a positional parameter with more than one digit,
-or when @var{parameter} is followed by a character that is not to be
-interpreted as part of its name.
-
-If the first character of @var{parameter} is an exclamation point (!),
-it introduces a level of variable indirection.
-Bash uses the value of the variable formed from the rest of
-@var{parameter} as the name of the variable; this variable is then
-expanded and that value is used in the rest of the substitution, rather
-than the value of @var{parameter} itself.
-This is known as @code{indirect expansion}.
-The exceptions to this are the expansions of $@{!@var{prefix}*@}
-and $@{!@var{name}[@@]@}
-described below.
-The exclamation point must immediately follow the left brace in order to
-introduce indirection.
-
-In each of the cases below, @var{word} is subject to tilde expansion,
-parameter expansion, command substitution, and arithmetic expansion.
-
-When not performing substring expansion, using the form described
-below (e.g., @samp{:-}), Bash tests for a parameter that is unset or null.
-Omitting the colon results in a test only for a parameter that is unset.
-Put another way, if the colon is included,
-the operator tests for both @var{parameter}'s existence and that its value
-is not null; if the colon is omitted, the operator tests only for existence.
-
-@table @code
-
-@item $@{@var{parameter}:@minus{}@var{word}@}
-If @var{parameter} is unset or null, the expansion of
-@var{word} is substituted. Otherwise, the value of
-@var{parameter} is substituted.
-
-@item $@{@var{parameter}:=@var{word}@}
-If @var{parameter}
-is unset or null, the expansion of @var{word}
-is assigned to @var{parameter}.
-The value of @var{parameter} is then substituted.
-Positional parameters and special parameters may not be assigned to
-in this way.
-
-@item $@{@var{parameter}:?@var{word}@}
-If @var{parameter}
-is null or unset, the expansion of @var{word} (or a message
-to that effect if @var{word}
-is not present) is written to the standard error and the shell, if it
-is not interactive, exits. Otherwise, the value of @var{parameter} is
-substituted.
-
-@item $@{@var{parameter}:+@var{word}@}
-If @var{parameter}
-is null or unset, nothing is substituted, otherwise the expansion of
-@var{word} is substituted.
-
-@item $@{@var{parameter}:@var{offset}@}
-@itemx $@{@var{parameter}:@var{offset}:@var{length}@}
-This is referred to as Substring Expansion.
-It expands to up to @var{length} characters of the value of @var{parameter}
-starting at the character specified by @var{offset}.
-If @var{parameter} is @samp{@@}, an indexed array subscripted by
-@samp{@@} or @samp{*}, or an associative array name, the results differ as
-described below.
-If @var{length} is omitted, it expands to the substring of the value of
-@var{parameter} starting at the character specified by @var{offset}
-and extending to the end of the value.
-@var{length} and @var{offset} are arithmetic expressions
-(@pxref{Shell Arithmetic}).
-
-If @var{offset} evaluates to a number less than zero, the value
-is used as an offset in characters
-from the end of the value of @var{parameter}.
-If @var{length} evaluates to a number less than zero,
-it is interpreted as an offset in characters
-from the end of the value of @var{parameter} rather than
-a number of characters, and the expansion is the characters between
-@var{offset} and that result.
-Note that a negative offset must be separated from the colon by at least
-one space to avoid being confused with the @samp{:-} expansion.
-
-Here are some examples illustrating substring expansion on parameters and
-subscripted arrays:
-
-@verbatim
-$ string=01234567890abcdefgh
-$ echo ${string:7}
-7890abcdefgh
-$ echo ${string:7:0}
-
-$ echo ${string:7:2}
-78
-$ echo ${string:7:-2}
-7890abcdef
-$ echo ${string: -7}
-bcdefgh
-$ echo ${string: -7:0}
-
-$ echo ${string: -7:2}
-bc
-$ echo ${string: -7:-2}
-bcdef
-$ set -- 01234567890abcdefgh
-$ echo ${1:7}
-7890abcdefgh
-$ echo ${1:7:0}
-
-$ echo ${1:7:2}
-78
-$ echo ${1:7:-2}
-7890abcdef
-$ echo ${1: -7}
-bcdefgh
-$ echo ${1: -7:0}
-
-$ echo ${1: -7:2}
-bc
-$ echo ${1: -7:-2}
-bcdef
-$ array[0]=01234567890abcdefgh
-$ echo ${array[0]:7}
-7890abcdefgh
-$ echo ${array[0]:7:0}
-
-$ echo ${array[0]:7:2}
-78
-$ echo ${array[0]:7:-2}
-7890abcdef
-$ echo ${array[0]: -7}
-bcdefgh
-$ echo ${array[0]: -7:0}
-
-$ echo ${array[0]: -7:2}
-bc
-$ echo ${array[0]: -7:-2}
-bcdef
-@end verbatim
-
-If @var{parameter} is @samp{@@}, the result is @var{length} positional
-parameters beginning at @var{offset}.
-A negative @var{offset} is taken relative to one greater than the greatest
-positional parameter, so an offset of -1 evaluates to the last positional
-parameter.
-It is an expansion error if @var{length} evaluates to a number less than zero.
-
-The following examples illustrate substring expansion using positional
-parameters:
-
-@verbatim
-$ set -- 1 2 3 4 5 6 7 8 9 0 a b c d e f g h
-$ echo ${@:7}
-7 8 9 0 a b c d e f g h
-$ echo ${@:7:0}
-
-$ echo ${@:7:2}
-7 8
-$ echo ${@:7:-2}
-bash: -2: substring expression < 0
-$ echo ${@: -7:2}
-b c
-$ echo ${@:0}
-./bash 1 2 3 4 5 6 7 8 9 0 a b c d e f g h
-$ echo ${@:0:2}
-./bash 1
-$ echo ${@: -7:0}
-
-@end verbatim
-
-If @var{parameter} is an indexed array name subscripted
-by @samp{@@} or @samp{*}, the result is the @var{length}
-members of the array beginning with @code{$@{@var{parameter}[@var{offset}]@}}.
-A negative @var{offset} is taken relative to one greater than the maximum
-index of the specified array.
-It is an expansion error if @var{length} evaluates to a number less than zero.
-
-These examples show how you can use substring expansion with indexed
-arrays:
-
-@verbatim
-$ array=(0 1 2 3 4 5 6 7 8 9 0 a b c d e f g h)
-$ echo ${array[@]:7}
-7 8 9 0 a b c d e f g h
-$ echo ${array[@]:7:2}
-7 8
-$ echo ${array[@]: -7:2}
-b c
-$ echo ${array[@]: -7:-2}
-bash: -2: substring expression < 0
-$ echo ${array[@]:0}
-0 1 2 3 4 5 6 7 8 9 0 a b c d e f g h
-$ echo ${array[@]:0:2}
-0 1
-$ echo ${array[@]: -7:0}
-
-@end verbatim
-
-Substring expansion applied to an associative array produces undefined
-results.
-
-Substring indexing is zero-based unless the positional parameters
-are used, in which case the indexing starts at 1 by default.
-If @var{offset} is 0, and the positional parameters are used, @code{$@@} is
-prefixed to the list.
-
-@item $@{!@var{prefix}*@}
-@itemx $@{!@var{prefix}@@@}
-Expands to the names of variables whose names begin with @var{prefix},
-separated by the first character of the @env{IFS} special variable.
-When @samp{@@} is used and the expansion appears within double quotes, each
-variable name expands to a separate word.
-
-@item $@{!@var{name}[@@]@}
-@itemx $@{!@var{name}[*]@}
-If @var{name} is an array variable, expands to the list of array indices
-(keys) assigned in @var{name}.
-If @var{name} is not an array, expands to 0 if @var{name} is set and null
-otherwise.
-When @samp{@@} is used and the expansion appears within double quotes, each
-key expands to a separate word.
-
-@item $@{#@var{parameter}@}
-The length in characters of the expanded value of @var{parameter} is
-substituted.
-If @var{parameter} is @samp{*} or @samp{@@}, the value substituted
-is the number of positional parameters.
-If @var{parameter} is an array name subscripted by @samp{*} or @samp{@@},
-the value substituted is the number of elements in the array.
-If @var{parameter}
-is an indexed array name subscripted by a negative number, that number is
-interpreted as relative to one greater than the maximum index of
-@var{parameter}, so negative indices count back from the end of the
-array, and an index of -1 references the last element.
-
-@item $@{@var{parameter}#@var{word}@}
-@itemx $@{@var{parameter}##@var{word}@}
-The @var{word}
-is expanded to produce a pattern just as in filename
-expansion (@pxref{Filename Expansion}). If the pattern matches
-the beginning of the expanded value of @var{parameter},
-then the result of the expansion is the expanded value of @var{parameter}
-with the shortest matching pattern (the @samp{#} case) or the
-longest matching pattern (the @samp{##} case) deleted.
-If @var{parameter} is @samp{@@} or @samp{*},
-the pattern removal operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If @var{parameter} is an array variable subscripted with
-@samp{@@} or @samp{*},
-the pattern removal operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-
-@item $@{@var{parameter}%@var{word}@}
-@itemx $@{@var{parameter}%%@var{word}@}
-The @var{word} is expanded to produce a pattern just as in
-filename expansion.
-If the pattern matches a trailing portion of the expanded value of
-@var{parameter}, then the result of the expansion is the value of
-@var{parameter} with the shortest matching pattern (the @samp{%} case)
-or the longest matching pattern (the @samp{%%} case) deleted.
-If @var{parameter} is @samp{@@} or @samp{*},
-the pattern removal operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If @var{parameter}
-is an array variable subscripted with @samp{@@} or @samp{*},
-the pattern removal operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-
-@item $@{@var{parameter}/@var{pattern}/@var{string}@}
-
-The @var{pattern} is expanded to produce a pattern just as in
-filename expansion.
-@var{Parameter} is expanded and the longest match of @var{pattern}
-against its value is replaced with @var{string}.
-If @var{pattern} begins with @samp{/}, all matches of @var{pattern} are
-replaced with @var{string}. Normally only the first match is replaced.
-If @var{pattern} begins with @samp{#}, it must match at the beginning
-of the expanded value of @var{parameter}.
-If @var{pattern} begins with @samp{%}, it must match at the end
-of the expanded value of @var{parameter}.
-If @var{string} is null, matches of @var{pattern} are deleted
-and the @code{/} following @var{pattern} may be omitted.
-If @var{parameter} is @samp{@@} or @samp{*},
-the substitution operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If @var{parameter}
-is an array variable subscripted with @samp{@@} or @samp{*},
-the substitution operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-
-@item $@{@var{parameter}^@var{pattern}@}
-@itemx $@{@var{parameter}^^@var{pattern}@}
-@itemx $@{@var{parameter},@var{pattern}@}
-@itemx $@{@var{parameter},,@var{pattern}@}
-This expansion modifies the case of alphabetic characters in @var{parameter}.
-The @var{pattern} is expanded to produce a pattern just as in
-filename expansion.
-Each character in the expanded value of @var{parameter} is tested against
-@var{pattern}, and, if it matches the pattern, its case is converted.
-The pattern should not attempt to match more than one character.
-The @samp{^} operator converts lowercase letters matching @var{pattern}
-to uppercase; the @samp{,} operator converts matching uppercase letters
-to lowercase.
-The @samp{^^} and @samp{,,} expansions convert each matched character in the
-expanded value; the @samp{^} and @samp{,} expansions match and convert only
-the first character in the expanded value.
-If @var{pattern} is omitted, it is treated like a @samp{?}, which matches
-every character.
-If @var{parameter} is @samp{@@} or @samp{*},
-the case modification operation is applied to each positional
-parameter in turn, and the expansion is the resultant list.
-If @var{parameter}
-is an array variable subscripted with @samp{@@} or @samp{*},
-the case modification operation is applied to each member of the
-array in turn, and the expansion is the resultant list.
-@end table
-
-@node Command Substitution
-@subsection Command Substitution
-@cindex command substitution
-
-Command substitution allows the output of a command to replace
-the command itself.
-Command substitution occurs when a command is enclosed as follows:
-@example
-$(@var{command})
-@end example
-@noindent
-or
-@example
-`@var{command}`
-@end example
-
-@noindent
-Bash performs the expansion by executing @var{command} and
-replacing the command substitution with the standard output of the
-command, with any trailing newlines deleted.
-Embedded newlines are not deleted, but they may be removed during
-word splitting.
-The command substitution @code{$(cat @var{file})} can be
-replaced by the equivalent but faster @code{$(< @var{file})}.
-
-When the old-style backquote form of substitution is used,
-backslash retains its literal meaning except when followed by
-@samp{$}, @samp{`}, or @samp{\}.
-The first backquote not preceded by a backslash terminates the
-command substitution.
-When using the @code{$(@var{command})} form, all characters between
-the parentheses make up the command; none are treated specially.
-
-Command substitutions may be nested. To nest when using the backquoted
-form, escape the inner backquotes with backslashes.
-
-If the substitution appears within double quotes, word splitting and
-filename expansion are not performed on the results.
-
-@node Arithmetic Expansion
-@subsection Arithmetic Expansion
-@cindex expansion, arithmetic
-@cindex arithmetic expansion
-
-Arithmetic expansion allows the evaluation of an arithmetic expression
-and the substitution of the result. The format for arithmetic expansion is:
-
-@example
-$(( @var{expression} ))
-@end example
-
-The expression is treated as if it were within double quotes, but
-a double quote inside the parentheses is not treated specially.
-All tokens in the expression undergo parameter and variable expansion,
-command substitution, and quote removal.
-The result is treated as the arithmetic expression to be evaluated.
-Arithmetic expansions may be nested.
-
-The evaluation is performed according to the rules listed below
-(@pxref{Shell Arithmetic}).
-If the expression is invalid, Bash prints a message indicating
-failure to the standard error and no substitution occurs.
-
-@node Process Substitution
-@subsection Process Substitution
-@cindex process substitution
-
-Process substitution is supported on systems that support named
-pipes (@sc{fifo}s) or the @file{/dev/fd} method of naming open files.
-It takes the form of
-@example
-<(@var{list})
-@end example
-@noindent
-or
-@example
->(@var{list})
-@end example
-@noindent
-The process @var{list} is run with its input or output connected to a
-@sc{fifo} or some file in @file{/dev/fd}. The name of this file is
-passed as an argument to the current command as the result of the
-expansion. If the @code{>(@var{list})} form is used, writing to
-the file will provide input for @var{list}. If the
-@code{<(@var{list})} form is used, the file passed as an
-argument should be read to obtain the output of @var{list}.
-Note that no space may appear between the @code{<} or @code{>}
-and the left parenthesis, otherwise the construct would be interpreted
-as a redirection.
-
-When available, process substitution is performed simultaneously with
-parameter and variable expansion, command substitution, and arithmetic
-expansion.
-
-@node Word Splitting
-@subsection Word Splitting
-@cindex word splitting
-
-The shell scans the results of parameter expansion, command substitution,
-and arithmetic expansion that did not occur within double quotes for
-word splitting.
-
-The shell treats each character of @env{$IFS} as a delimiter, and splits
-the results of the other expansions into words using these characters
-as field terminators.
-If @env{IFS} is unset, or its value is exactly @code{<space><tab><newline>},
-the default, then sequences of
-@code{ <space>}, @code{<tab>}, and @code{<newline>}
-at the beginning and end of the results of the previous
-expansions are ignored, and any sequence of @env{IFS}
-characters not at the beginning or end serves to delimit words.
-If @env{IFS} has a value other than the default, then sequences of
-the whitespace characters @code{space} and @code{tab}
-are ignored at the beginning and end of the
-word, as long as the whitespace character is in the
-value of @env{IFS} (an @env{IFS} whitespace character).
-Any character in @env{IFS} that is not @env{IFS}
-whitespace, along with any adjacent @env{IFS}
-whitespace characters, delimits a field. A sequence of @env{IFS}
-whitespace characters is also treated as a delimiter.
-If the value of @env{IFS} is null, no word splitting occurs.
-
-Explicit null arguments (@code{""} or @code{''}) are retained.
-Unquoted implicit null arguments, resulting from the expansion of
-parameters that have no values, are removed.
-If a parameter with no value is expanded within double quotes, a
-null argument results and is retained.
-
-Note that if no expansion occurs, no splitting
-is performed.
-
-@node Filename Expansion
-@subsection Filename Expansion
-@menu
-* Pattern Matching:: How the shell matches patterns.
-@end menu
-@cindex expansion, filename
-@cindex expansion, pathname
-@cindex filename expansion
-@cindex pathname expansion
-
-After word splitting, unless the @option{-f} option has been set
-(@pxref{The Set Builtin}), Bash scans each word for the characters
-@samp{*}, @samp{?}, and @samp{[}.
-If one of these characters appears, then the word is
-regarded as a @var{pattern},
-and replaced with an alphabetically sorted list of
-filenames matching the pattern (@pxref{Pattern Matching}).
-If no matching filenames are found,
-and the shell option @code{nullglob} is disabled, the word is left
-unchanged.
-If the @code{nullglob} option is set, and no matches are found, the word
-is removed.
-If the @code{failglob} shell option is set, and no matches are found,
-an error message is printed and the command is not executed.
-If the shell option @code{nocaseglob} is enabled, the match is performed
-without regard to the case of alphabetic characters.
-
-When a pattern is used for filename expansion, the character @samp{.}
-at the start of a filename or immediately following a slash
-must be matched explicitly, unless the shell option @code{dotglob} is set.
-When matching a filename, the slash character must always be
-matched explicitly.
-In other cases, the @samp{.} character is not treated specially.
-
-See the description of @code{shopt} in @ref{The Shopt Builtin},
-for a description of the @code{nocaseglob}, @code{nullglob},
-@code{failglob}, and @code{dotglob} options.
-
-The @env{GLOBIGNORE}
-shell variable may be used to restrict the set of filenames matching a
-pattern. If @env{GLOBIGNORE}
-is set, each matching filename that also matches one of the patterns in
-@env{GLOBIGNORE} is removed from the list of matches. The filenames
-@file{.} and @file{..}
-are always ignored when @env{GLOBIGNORE}
-is set and not null.
-However, setting @env{GLOBIGNORE} to a non-null value has the effect of
-enabling the @code{dotglob}
-shell option, so all other filenames beginning with a
-@samp{.} will match.
-To get the old behavior of ignoring filenames beginning with a
-@samp{.}, make @samp{.*} one of the patterns in @env{GLOBIGNORE}.
-The @code{dotglob} option is disabled when @env{GLOBIGNORE}
-is unset.
-
-@node Pattern Matching
-@subsubsection Pattern Matching
-@cindex pattern matching
-@cindex matching, pattern
-
-Any character that appears in a pattern, other than the special pattern
-characters described below, matches itself.
-The @sc{nul} character may not occur in a pattern.
-A backslash escapes the following character; the
-escaping backslash is discarded when matching.
-The special pattern characters must be quoted if they are to be matched
-literally.
-
-The special pattern characters have the following meanings:
-@table @code
-@item *
-Matches any string, including the null string.
-When the @code{globstar} shell option is enabled, and @samp{*} is used in
-a filename expansion context, two adjacent @samp{*}s used as a single
-pattern will match all files and zero or more directories and
-subdirectories.
-If followed by a @samp{/}, two adjacent @samp{*}s will match only
-directories and subdirectories.
-@item ?
-Matches any single character.
-@item [@dots{}]
-Matches any one of the enclosed characters. A pair of characters
-separated by a hyphen denotes a @var{range expression};
-any character that falls between those two characters, inclusive,
-using the current locale's collating sequence and character set,
-is matched. If the first character following the
-@samp{[} is a @samp{!} or a @samp{^}
-then any character not enclosed is matched. A @samp{@minus{}}
-may be matched by including it as the first or last character
-in the set. A @samp{]} may be matched by including it as the first
-character in the set.
-The sorting order of characters in range expressions is determined by
-the current locale and the values of the
-@env{LC_COLLATE} and @env{LC_ALL} shell variables, if set.
-
-For example, in the default C locale, @samp{[a-dx-z]} is equivalent to
-@samp{[abcdxyz]}. Many locales sort characters in dictionary order, and in
-these locales @samp{[a-dx-z]} is typically not equivalent to @samp{[abcdxyz]};
-it might be equivalent to @samp{[aBbCcDdxXyYz]}, for example. To obtain
-the traditional interpretation of ranges in bracket expressions, you can
-force the use of the C locale by setting the @env{LC_COLLATE} or
-@env{LC_ALL} environment variable to the value @samp{C}, or enable the
-@code{globasciiranges} shell option.
-
-Within @samp{[} and @samp{]}, @var{character classes} can be specified
-using the syntax
-@code{[:}@var{class}@code{:]}, where @var{class} is one of the
-following classes defined in the @sc{posix} standard:
-@example
-alnum alpha ascii blank cntrl digit graph lower
-print punct space upper word xdigit
-@end example
-@noindent
-A character class matches any character belonging to that class.
-The @code{word} character class matches letters, digits, and the character
-@samp{_}.
-
-Within @samp{[} and @samp{]}, an @var{equivalence class} can be
-specified using the syntax @code{[=}@var{c}@code{=]}, which
-matches all characters with the same collation weight (as defined
-by the current locale) as the character @var{c}.
-
-Within @samp{[} and @samp{]}, the syntax @code{[.}@var{symbol}@code{.]}
-matches the collating symbol @var{symbol}.
-@end table
-
-If the @code{extglob} shell option is enabled using the @code{shopt}
-builtin, several extended pattern matching operators are recognized.
-In the following description, a @var{pattern-list} is a list of one
-or more patterns separated by a @samp{|}.
-Composite patterns may be formed using one or more of the following
-sub-patterns:
-
-@table @code
-@item ?(@var{pattern-list})
-Matches zero or one occurrence of the given patterns.
-
-@item *(@var{pattern-list})
-Matches zero or more occurrences of the given patterns.
-
-@item +(@var{pattern-list})
-Matches one or more occurrences of the given patterns.
-
-@item @@(@var{pattern-list})
-Matches one of the given patterns.
-
-@item !(@var{pattern-list})
-Matches anything except one of the given patterns.
-@end table
-
-@node Quote Removal
-@subsection Quote Removal
-
-After the preceding expansions, all unquoted occurrences of the
-characters @samp{\}, @samp{'}, and @samp{"} that did not
-result from one of the above expansions are removed.
-
-@node Redirections
-@section Redirections
-@cindex redirection
-
-Before a command is executed, its input and output
-may be @var{redirected}
-using a special notation interpreted by the shell.
-Redirection allows commands' file handles to be
-duplicated, opened, closed,
-made to refer to different files,
-and can change the files the command reads from and writes to.
-Redirection may also be used to modify file handles in the
-current shell execution environment. The following redirection
-operators may precede or appear anywhere within a
-simple command or may follow a command.
-Redirections are processed in the order they appear, from
-left to right.
-
-Each redirection that may be preceded by a file descriptor number
-may instead be preceded by a word of the form @{@var{varname}@}.
-In this case, for each redirection operator except
->&- and <&-, the shell will allocate a file descriptor greater
-than 10 and assign it to @{@var{varname}@}. If >&- or <&- is preceded
-by @{@var{varname}@}, the value of @var{varname} defines the file
-descriptor to close.
-
-In the following descriptions, if the file descriptor number is
-omitted, and the first character of the redirection operator is
-@samp{<}, the redirection refers to the standard input (file
-descriptor 0). If the first character of the redirection operator
-is @samp{>}, the redirection refers to the standard output (file
-descriptor 1).
-
-The word following the redirection operator in the following
-descriptions, unless otherwise noted, is subjected to brace expansion,
-tilde expansion, parameter expansion, command substitution, arithmetic
-expansion, quote removal, filename expansion, and word splitting.
-If it expands to more than one word, Bash reports an error.
-
-Note that the order of redirections is significant. For example,
-the command
-@example
-ls > @var{dirlist} 2>&1
-@end example
-@noindent
-directs both standard output (file descriptor 1) and standard error
-(file descriptor 2) to the file @var{dirlist}, while the command
-@example
-ls 2>&1 > @var{dirlist}
-@end example
-@noindent
-directs only the standard output to file @var{dirlist},
-because the standard error was made a copy of the standard output
-before the standard output was redirected to @var{dirlist}.
-
-Bash handles several filenames specially when they are used in
-redirections, as described in the following table:
-
-@table @code
-@item /dev/fd/@var{fd}
-If @var{fd} is a valid integer, file descriptor @var{fd} is duplicated.
-
-@item /dev/stdin
-File descriptor 0 is duplicated.
-
-@item /dev/stdout
-File descriptor 1 is duplicated.
-
-@item /dev/stderr
-File descriptor 2 is duplicated.
-
-@item /dev/tcp/@var{host}/@var{port}
-If @var{host} is a valid hostname or Internet address, and @var{port}
-is an integer port number or service name, Bash attempts to open
-the corresponding TCP socket.
-
-@item /dev/udp/@var{host}/@var{port}
-If @var{host} is a valid hostname or Internet address, and @var{port}
-is an integer port number or service name, Bash attempts to open
-the corresponding UDP socket.
-@end table
-
-A failure to open or create a file causes the redirection to fail.
-
-Redirections using file descriptors greater than 9 should be used with
-care, as they may conflict with file descriptors the shell uses
-internally.
-
-@subsection Redirecting Input
-Redirection of input causes the file whose name results from
-the expansion of @var{word}
-to be opened for reading on file descriptor @code{n},
-or the standard input (file descriptor 0) if @code{n}
-is not specified.
-
-The general format for redirecting input is:
-@example
-[@var{n}]<@var{word}
-@end example
-
-@subsection Redirecting Output
-Redirection of output causes the file whose name results from
-the expansion of @var{word}
-to be opened for writing on file descriptor @var{n},
-or the standard output (file descriptor 1) if @var{n}
-is not specified. If the file does not exist it is created;
-if it does exist it is truncated to zero size.
-
-The general format for redirecting output is:
-@example
-[@var{n}]>[|]@var{word}
-@end example
-
-If the redirection operator is @samp{>}, and the @code{noclobber}
-option to the @code{set} builtin has been enabled, the redirection
-will fail if the file whose name results from the expansion of
-@var{word} exists and is a regular file.
-If the redirection operator is @samp{>|}, or the redirection operator is
-@samp{>} and the @code{noclobber} option is not enabled, the redirection
-is attempted even if the file named by @var{word} exists.
-
-@subsection Appending Redirected Output
-Redirection of output in this fashion
-causes the file whose name results from
-the expansion of @var{word}
-to be opened for appending on file descriptor @var{n},
-or the standard output (file descriptor 1) if @var{n}
-is not specified. If the file does not exist it is created.
-
-The general format for appending output is:
-@example
-[@var{n}]>>@var{word}
-@end example
-
-@subsection Redirecting Standard Output and Standard Error
-This construct allows both the
-standard output (file descriptor 1) and
-the standard error output (file descriptor 2)
-to be redirected to the file whose name is the
-expansion of @var{word}.
-
-There are two formats for redirecting standard output and
-standard error:
-@example
-&>@var{word}
-@end example
-@noindent
-and
-@example
->&@var{word}
-@end example
-@noindent
-Of the two forms, the first is preferred.
-This is semantically equivalent to
-@example
->@var{word} 2>&1
-@end example
-When using the second form, @var{word} may not expand to a number or
-@samp{-}. If it does, other redirection operators apply
-(see Duplicating File Descriptors below) for compatibility reasons.
-
-@subsection Appending Standard Output and Standard Error
-This construct allows both the
-standard output (file descriptor 1) and
-the standard error output (file descriptor 2)
-to be appended to the file whose name is the
-expansion of @var{word}.
-
-The format for appending standard output and standard error is:
-@example
-&>>@var{word}
-@end example
-@noindent
-This is semantically equivalent to
-@example
->>@var{word} 2>&1
-@end example
-(see Duplicating File Descriptors below).
-
-@subsection Here Documents
-This type of redirection instructs the shell to read input from the
-current source until a line containing only @var{word}
-(with no trailing blanks) is seen. All of
-the lines read up to that point are then used as the standard
-input for a command.
-
-The format of here-documents is:
-@example
-<<[@minus{}]@var{word}
- @var{here-document}
-@var{delimiter}
-@end example
-
-No parameter and variable expansion, command substitution,
-arithmetic expansion, or filename expansion is performed on
-@var{word}. If any characters in @var{word} are quoted, the
-@var{delimiter} is the result of quote removal on @var{word},
-and the lines in the here-document are not expanded.
-If @var{word} is unquoted,
-all lines of the here-document are subjected to
-parameter expansion, command substitution, and arithmetic expansion,
-the character sequence @code{\newline} is ignored, and @samp{\}
-must be used to quote the characters
-@samp{\}, @samp{$}, and @samp{`}.
-
-If the redirection operator is @samp{<<-},
-then all leading tab characters are stripped from input lines and the
-line containing @var{delimiter}.
-This allows here-documents within shell scripts to be indented in a
-natural fashion.
-
-@subsection Here Strings
-A variant of here documents, the format is:
-@example
-<<< @var{word}
-@end example
-
-The @var{word} undergoes
-brace expansion, tilde expansion, parameter and variable expansion,
-command substitution, arithmetic expansion, and quote removal.
-Pathname expansion and word splitting are not performed.
-The result is supplied as a single string to the command on its
-standard input.
-
-@subsection Duplicating File Descriptors
-The redirection operator
-@example
-[@var{n}]<&@var{word}
-@end example
-@noindent
-is used to duplicate input file descriptors.
-If @var{word}
-expands to one or more digits, the file descriptor denoted by @var{n}
-is made to be a copy of that file descriptor.
-If the digits in @var{word} do not specify a file descriptor open for
-input, a redirection error occurs.
-If @var{word}
-evaluates to @samp{-}, file descriptor @var{n} is closed.
-If @var{n} is not specified, the standard input (file descriptor 0) is used.
-
-The operator
-@example
-[@var{n}]>&@var{word}
-@end example
-@noindent
-is used similarly to duplicate output file descriptors. If
-@var{n} is not specified, the standard output (file descriptor 1) is used.
-If the digits in @var{word} do not specify a file descriptor open for
-output, a redirection error occurs.
-If @var{word}
-evaluates to @samp{-}, file descriptor @var{n} is closed.
-As a special case, if @var{n} is omitted, and @var{word} does not
-expand to one or more digits or @samp{-}, the standard output and standard
-error are redirected as described previously.
-
-@subsection Moving File Descriptors
-The redirection operator
-@example
-[@var{n}]<&@var{digit}-
-@end example
-@noindent
-moves the file descriptor @var{digit} to file descriptor @var{n},
-or the standard input (file descriptor 0) if @var{n} is not specified.
-@var{digit} is closed after being duplicated to @var{n}.
-
-Similarly, the redirection operator
-@example
-[@var{n}]>&@var{digit}-
-@end example
-@noindent
-moves the file descriptor @var{digit} to file descriptor @var{n},
-or the standard output (file descriptor 1) if @var{n} is not specified.
-
-@subsection Opening File Descriptors for Reading and Writing
-The redirection operator
-@example
-[@var{n}]<>@var{word}
-@end example
-@noindent
-causes the file whose name is the expansion of @var{word}
-to be opened for both reading and writing on file descriptor
-@var{n}, or on file descriptor 0 if @var{n}
-is not specified. If the file does not exist, it is created.
-
-@node Executing Commands
-@section Executing Commands
-
-@menu
-* Simple Command Expansion:: How Bash expands simple commands before
- executing them.
-* Command Search and Execution:: How Bash finds commands and runs them.
-* Command Execution Environment:: The environment in which Bash
- executes commands that are not
- shell builtins.
-* Environment:: The environment given to a command.
-* Exit Status:: The status returned by commands and how Bash
- interprets it.
-* Signals:: What happens when Bash or a command it runs
- receives a signal.
-@end menu
-
-@node Simple Command Expansion
-@subsection Simple Command Expansion
-@cindex command expansion
-
-When a simple command is executed, the shell performs the following
-expansions, assignments, and redirections, from left to right.
-
-@enumerate
-@item
-The words that the parser has marked as variable assignments (those
-preceding the command name) and redirections are saved for later
-processing.
-
-@item
-The words that are not variable assignments or redirections are
-expanded (@pxref{Shell Expansions}).
-If any words remain after expansion, the first word
-is taken to be the name of the command and the remaining words are
-the arguments.
-
-@item
-Redirections are performed as described above (@pxref{Redirections}).
-
-@item
-The text after the @samp{=} in each variable assignment undergoes tilde
-expansion, parameter expansion, command substitution, arithmetic expansion,
-and quote removal before being assigned to the variable.
-@end enumerate
-
-If no command name results, the variable assignments affect the current
-shell environment. Otherwise, the variables are added to the environment
-of the executed command and do not affect the current shell environment.
-If any of the assignments attempts to assign a value to a readonly variable,
-an error occurs, and the command exits with a non-zero status.
-
-If no command name results, redirections are performed, but do not
-affect the current shell environment. A redirection error causes the
-command to exit with a non-zero status.
-
-If there is a command name left after expansion, execution proceeds as
-described below. Otherwise, the command exits. If one of the expansions
-contained a command substitution, the exit status of the command is
-the exit status of the last command substitution performed. If there
-were no command substitutions, the command exits with a status of zero.
-
-@node Command Search and Execution
-@subsection Command Search and Execution
-@cindex command execution
-@cindex command search
-
-After a command has been split into words, if it results in a
-simple command and an optional list of arguments, the following
-actions are taken.
-
-@enumerate
-@item
-If the command name contains no slashes, the shell attempts to
-locate it. If there exists a shell function by that name, that
-function is invoked as described in @ref{Shell Functions}.
-
-@item
-If the name does not match a function, the shell searches for
-it in the list of shell builtins. If a match is found, that
-builtin is invoked.
-
-@item
-If the name is neither a shell function nor a builtin,
-and contains no slashes, Bash searches each element of
-@env{$PATH} for a directory containing an executable file
-by that name. Bash uses a hash table to remember the full
-pathnames of executable files to avoid multiple @env{PATH} searches
-(see the description of @code{hash} in @ref{Bourne Shell Builtins}).
-A full search of the directories in @env{$PATH}
-is performed only if the command is not found in the hash table.
-If the search is unsuccessful, the shell searches for a defined shell
-function named @code{command_not_found_handle}.
-If that function exists, it is invoked with the original command and
-the original command's arguments as its arguments, and the function's
-exit status becomes the exit status of the shell.
-If that function is not defined, the shell prints an error
-message and returns an exit status of 127.
-
-@item
-If the search is successful, or if the command name contains
-one or more slashes, the shell executes the named program in
-a separate execution environment.
-Argument 0 is set to the name given, and the remaining arguments
-to the command are set to the arguments supplied, if any.
-
-@item
-If this execution fails because the file is not in executable
-format, and the file is not a directory, it is assumed to be a
-@var{shell script} and the shell executes it as described in
-@ref{Shell Scripts}.
-
-@item
-If the command was not begun asynchronously, the shell waits for
-the command to complete and collects its exit status.
-
-@end enumerate
-
-@node Command Execution Environment
-@subsection Command Execution Environment
-@cindex execution environment
-
-The shell has an @var{execution environment}, which consists of the
-following:
-
-@itemize @bullet
-@item
-open files inherited by the shell at invocation, as modified by
-redirections supplied to the @code{exec} builtin
-
-@item
-the current working directory as set by @code{cd}, @code{pushd}, or
-@code{popd}, or inherited by the shell at invocation
-
-@item
-the file creation mode mask as set by @code{umask} or inherited from
-the shell's parent
-
-@item
-current traps set by @code{trap}
-
-@item
-shell parameters that are set by variable assignment or with @code{set}
-or inherited from the shell's parent in the environment
-
-@item
-shell functions defined during execution or inherited from the shell's
-parent in the environment
-
-@item
-options enabled at invocation (either by default or with command-line
-arguments) or by @code{set}
-
-@item
-options enabled by @code{shopt} (@pxref{The Shopt Builtin})
-
-@item
-shell aliases defined with @code{alias} (@pxref{Aliases})
-
-@item
-various process @sc{id}s, including those of background jobs
-(@pxref{Lists}), the value of @code{$$}, and the value of
-@env{$PPID}
-
-@end itemize
-
-When a simple command other than a builtin or shell function
-is to be executed, it
-is invoked in a separate execution environment that consists of
-the following. Unless otherwise noted, the values are inherited
-from the shell.
-
-@itemize @bullet
-@item
-the shell's open files, plus any modifications and additions specified
-by redirections to the command
-
-@item
-the current working directory
-
-@item
-the file creation mode mask
-
-@item
-shell variables and functions marked for export, along with variables
-exported for the command, passed in the environment (@pxref{Environment})
-
-@item
-traps caught by the shell are reset to the values inherited from the
-shell's parent, and traps ignored by the shell are ignored
-
-@end itemize
-
-A command invoked in this separate environment cannot affect the
-shell's execution environment.
-
-Command substitution, commands grouped with parentheses,
-and asynchronous commands are invoked in a
-subshell environment that is a duplicate of the shell environment,
-except that traps caught by the shell are reset to the values
-that the shell inherited from its parent at invocation. Builtin
-commands that are invoked as part of a pipeline are also executed
-in a subshell environment. Changes made to the subshell environment
-cannot affect the shell's execution environment.
-
-Subshells spawned to execute command substitutions inherit the value of
-the @option{-e} option from the parent shell. When not in @sc{posix} mode,
-Bash clears the @option{-e} option in such subshells.
-
-If a command is followed by a @samp{&} and job control is not active, the
-default standard input for the command is the empty file @file{/dev/null}.
-Otherwise, the invoked command inherits the file descriptors of the calling
-shell as modified by redirections.
-
-@node Environment
-@subsection Environment
-@cindex environment
-
-When a program is invoked it is given an array of strings
-called the @var{environment}.
-This is a list of name-value pairs, of the form @code{name=value}.
-
-Bash provides several ways to manipulate the environment.
-On invocation, the shell scans its own environment and
-creates a parameter for each name found, automatically marking
-it for @var{export}
-to child processes. Executed commands inherit the environment.
-The @code{export} and @samp{declare -x}
-commands allow parameters and functions to be added to and
-deleted from the environment. If the value of a parameter
-in the environment is modified, the new value becomes part
-of the environment, replacing the old. The environment
-inherited by any executed command consists of the shell's
-initial environment, whose values may be modified in the shell,
-less any pairs removed by the @code{unset} and @samp{export -n}
-commands, plus any additions via the @code{export} and
-@samp{declare -x} commands.
-
-The environment for any simple command
-or function may be augmented temporarily by prefixing it with
-parameter assignments, as described in @ref{Shell Parameters}.
-These assignment statements affect only the environment seen
-by that command.
-
-If the @option{-k} option is set (@pxref{The Set Builtin}), then all
-parameter assignments are placed in the environment for a command,
-not just those that precede the command name.
-
-When Bash invokes an external command, the variable @samp{$_}
-is set to the full pathname of the command and passed to that
-command in its environment.
-
-@node Exit Status
-@subsection Exit Status
-@cindex exit status
-
-The exit status of an executed command is the value returned by the
-@var{waitpid} system call or equivalent function. Exit statuses
-fall between 0 and 255, though, as explained below, the shell may
-use values above 125 specially. Exit statuses from shell builtins and
-compound commands are also limited to this range. Under certain
-circumstances, the shell will use special values to indicate specific
-failure modes.
-
-For the shell's purposes, a command which exits with a
-zero exit status has succeeded.
-A non-zero exit status indicates failure.
-This seemingly counter-intuitive scheme is used so there
-is one well-defined way to indicate success and a variety of
-ways to indicate various failure modes.
-When a command terminates on a fatal signal whose number is @var{N},
-Bash uses the value 128+@var{N} as the exit status.
-
-If a command is not found, the child process created to
-execute it returns a status of 127. If a command is found
-but is not executable, the return status is 126.
-
-If a command fails because of an error during expansion or redirection,
-the exit status is greater than zero.
-
-The exit status is used by the Bash conditional commands
-(@pxref{Conditional Constructs}) and some of the list
-constructs (@pxref{Lists}).
-
-All of the Bash builtins return an exit status of zero if they succeed
-and a non-zero status on failure, so they may be used by the
-conditional and list constructs.
-All builtins return an exit status of 2 to indicate incorrect usage,
-generally invalid options or missing arguments.
-
-@node Signals
-@subsection Signals
-@cindex signal handling
-
-When Bash is interactive, in the absence of any traps, it ignores
-@code{SIGTERM} (so that @samp{kill 0} does not kill an interactive shell),
-and @code{SIGINT}
-is caught and handled (so that the @code{wait} builtin is interruptible).
-When Bash receives a @code{SIGINT}, it breaks out of any executing loops.
-In all cases, Bash ignores @code{SIGQUIT}.
-If job control is in effect (@pxref{Job Control}), Bash
-ignores @code{SIGTTIN}, @code{SIGTTOU}, and @code{SIGTSTP}.
-
-Non-builtin commands started by Bash have signal handlers set to the
-values inherited by the shell from its parent.
-When job control is not in effect, asynchronous commands
-ignore @code{SIGINT} and @code{SIGQUIT} in addition to these inherited
-handlers.
-Commands run as a result of
-command substitution ignore the keyboard-generated job control signals
-@code{SIGTTIN}, @code{SIGTTOU}, and @code{SIGTSTP}.
-
-The shell exits by default upon receipt of a @code{SIGHUP}.
-Before exiting, an interactive shell resends the @code{SIGHUP} to
-all jobs, running or stopped.
-Stopped jobs are sent @code{SIGCONT} to ensure that they receive
-the @code{SIGHUP}.
-To prevent the shell from sending the @code{SIGHUP} signal to a
-particular job, it should be removed
-from the jobs table with the @code{disown}
-builtin (@pxref{Job Control Builtins}) or marked
-to not receive @code{SIGHUP} using @code{disown -h}.
-
-If the @code{huponexit} shell option has been set with @code{shopt}
-(@pxref{The Shopt Builtin}), Bash sends a @code{SIGHUP} to all jobs when
-an interactive login shell exits.
-
-If Bash is waiting for a command to complete and receives a signal
-for which a trap has been set, the trap will not be executed until
-the command completes.
-When Bash is waiting for an asynchronous
-command via the @code{wait} builtin, the reception of a signal for
-which a trap has been set will cause the @code{wait} builtin to return
-immediately with an exit status greater than 128, immediately after
-which the trap is executed.
-
-@node Shell Scripts
-@section Shell Scripts
-@cindex shell script
-
-A shell script is a text file containing shell commands. When such
-a file is used as the first non-option argument when invoking Bash,
-and neither the @option{-c} nor @option{-s} option is supplied
-(@pxref{Invoking Bash}),
-Bash reads and executes commands from the file, then exits. This
-mode of operation creates a non-interactive shell. The shell first
-searches for the file in the current directory, and looks in the
-directories in @env{$PATH} if not found there.
-
-When Bash runs
-a shell script, it sets the special parameter @code{0} to the name
-of the file, rather than the name of the shell, and the positional
-parameters are set to the remaining arguments, if any are given.
-If no additional arguments are supplied, the positional parameters
-are unset.
-
-A shell script may be made executable by using the @code{chmod} command
-to turn on the execute bit. When Bash finds such a file while
-searching the @env{$PATH} for a command, it spawns a subshell to
-execute it. In other words, executing
-@example
-filename @var{arguments}
-@end example
-@noindent
-is equivalent to executing
-@example
-bash filename @var{arguments}
-@end example
-
-@noindent
-if @code{filename} is an executable shell script.
-This subshell reinitializes itself, so that the effect is as if a
-new shell had been invoked to interpret the script, with the
-exception that the locations of commands remembered by the parent
-(see the description of @code{hash} in @ref{Bourne Shell Builtins})
-are retained by the child.
-
-Most versions of Unix make this a part of the operating system's command
-execution mechanism. If the first line of a script begins with
-the two characters @samp{#!}, the remainder of the line specifies
-an interpreter for the program.
-Thus, you can specify Bash, @code{awk}, Perl, or some other
-interpreter and write the rest of the script file in that language.
-
-The arguments to the interpreter
-consist of a single optional argument following the interpreter
-name on the first line of the script file, followed by the name of
-the script file, followed by the rest of the arguments. Bash
-will perform this action on operating systems that do not handle it
-themselves. Note that some older versions of Unix limit the interpreter
-name and argument to a maximum of 32 characters.
-
-Bash scripts often begin with @code{#! /bin/bash} (assuming that
-Bash has been installed in @file{/bin}), since this ensures that
-Bash will be used to interpret the script, even if it is executed
-under another shell.
-
-@node Shell Builtin Commands
-@chapter Shell Builtin Commands
-
-@menu
-* Bourne Shell Builtins:: Builtin commands inherited from the Bourne
- Shell.
-* Bash Builtins:: Table of builtins specific to Bash.
-* Modifying Shell Behavior:: Builtins to modify shell attributes and
- optional behavior.
-* Special Builtins:: Builtin commands classified specially by
- POSIX.
-@end menu
-
-Builtin commands are contained within the shell itself.
-When the name of a builtin command is used as the first word of
-a simple command (@pxref{Simple Commands}), the shell executes
-the command directly, without invoking another program.
-Builtin commands are necessary to implement functionality impossible
-or inconvenient to obtain with separate utilities.
-
-This section briefly describes the builtins which Bash inherits from
-the Bourne Shell, as well as the builtin commands which are unique
-to or have been extended in Bash.
-
-Several builtin commands are described in other chapters: builtin
-commands which provide the Bash interface to the job control
-facilities (@pxref{Job Control Builtins}), the directory stack
-(@pxref{Directory Stack Builtins}), the command history
-(@pxref{Bash History Builtins}), and the programmable completion
-facilities (@pxref{Programmable Completion Builtins}).
-
-Many of the builtins have been extended by @sc{posix} or Bash.
-
-Unless otherwise noted, each builtin command documented as accepting
-options preceded by @samp{-} accepts @samp{--}
-to signify the end of the options.
-The @code{:}, @code{true}, @code{false}, and @code{test}
-builtins do not accept options and do not treat @samp{--} specially.
-The @code{exit}, @code{logout}, @code{break}, @code{continue}, @code{let},
-and @code{shift} builtins accept and process arguments beginning
-with @samp{-} without requiring @samp{--}.
-Other builtins that accept arguments but are not specified as accepting
-options interpret arguments beginning with @samp{-} as invalid options and
-require @samp{--} to prevent this interpretation.
-
-@node Bourne Shell Builtins
-@section Bourne Shell Builtins
-
-The following shell builtin commands are inherited from the Bourne Shell.
-These commands are implemented as specified by the @sc{posix} standard.
-
-@table @code
-@item : @r{(a colon)}
-@btindex :
-@example
-: [@var{arguments}]
-@end example
-
-Do nothing beyond expanding @var{arguments} and performing redirections.
-The return status is zero.
-
-@item . @r{(a period)}
-@btindex .
-@example
-. @var{filename} [@var{arguments}]
-@end example
-
-Read and execute commands from the @var{filename} argument in the
-current shell context. If @var{filename} does not contain a slash,
-the @env{PATH} variable is used to find @var{filename}.
-When Bash is not in @sc{posix} mode, the current directory is searched
-if @var{filename} is not found in @env{$PATH}.
-If any @var{arguments} are supplied, they become the positional
-parameters when @var{filename} is executed. Otherwise the positional
-parameters are unchanged.
-The return status is the exit status of the last command executed, or
-zero if no commands are executed. If @var{filename} is not found, or
-cannot be read, the return status is non-zero.
-This builtin is equivalent to @code{source}.
-
-@item break
-@btindex break
-@example
-break [@var{n}]
-@end example
-
-Exit from a @code{for}, @code{while}, @code{until}, or @code{select} loop.
-If @var{n} is supplied, the @var{n}th enclosing loop is exited.
-@var{n} must be greater than or equal to 1.
-The return status is zero unless @var{n} is not greater than or equal to 1.
-
-@item cd
-@btindex cd
-@example
-cd [-L|[-P [-e]] [-@@] [@var{directory}]
-@end example
-
-Change the current working directory to @var{directory}.
-If @var{directory} is not supplied, the value of the @env{HOME}
-shell variable is used.
-Any additional arguments following @var{directory} are ignored.
-If the shell variable
-@env{CDPATH} exists, it is used as a search path:
-each directory name in @env{CDPATH} is searched for
-@var{directory}, with alternative directory names in @env{CDPATH}
-separated by a colon (@samp{:}).
-If @var{directory} begins with a slash, @env{CDPATH} is not used.
-
-The @option{-P} option means to not follow symbolic links: symbolic links
-are resolved while @code{cd} is traversing @var{directory} and before
-processing an instance of @samp{..} in @var{directory}.
-
-By default, or when the @option{-L} option is supplied, symbolic links
-in @var{directory} are resolved after @code{cd} processes an instance
-of @samp{..} in @var{directory}.
-
-If @samp{..} appears in @var{directory}, it is processed by removing the
-immediately preceding pathname component, back to a slash or the beginning
-of @var{directory}.
-
-If the @option{-e} option is supplied with @option{-P}
-and the current working directory cannot be successfully determined
-after a successful directory change, @code{cd} will return an unsuccessful
-status.
-
-On systems that support it, the @option{-@@} option presents the extended
-attributes associated with a file as a directory.
-
-If @var{directory} is @samp{-}, it is converted to @env{$OLDPWD}
-before the directory change is attempted.
-
-If a non-empty directory name from @env{CDPATH} is used, or if
-@samp{-} is the first argument, and the directory change is
-successful, the absolute pathname of the new working directory is
-written to the standard output.
-
-The return status is zero if the directory is successfully changed,
-non-zero otherwise.
-
-@item continue
-@btindex continue
-@example
-continue [@var{n}]
-@end example
-
-Resume the next iteration of an enclosing @code{for}, @code{while},
-@code{until}, or @code{select} loop.
-If @var{n} is supplied, the execution of the @var{n}th enclosing loop
-is resumed.
-@var{n} must be greater than or equal to 1.
-The return status is zero unless @var{n} is not greater than or equal to 1.
-
-@item eval
-@btindex eval
-@example
-eval [@var{arguments}]
-@end example
-
-The arguments are concatenated together into a single command, which is
-then read and executed, and its exit status returned as the exit status
-of @code{eval}.
-If there are no arguments or only empty arguments, the return status is
-zero.
-
-@item exec
-@btindex exec
-@example
-exec [-cl] [-a @var{name}] [@var{command} [@var{arguments}]]
-@end example
-
-If @var{command}
-is supplied, it replaces the shell without creating a new process.
-If the @option{-l} option is supplied, the shell places a dash at the
-beginning of the zeroth argument passed to @var{command}.
-This is what the @code{login} program does.
-The @option{-c} option causes @var{command} to be executed with an empty
-environment.
-If @option{-a} is supplied, the shell passes @var{name} as the zeroth
-argument to @var{command}.
-If @var{command}
-cannot be executed for some reason, a non-interactive shell exits,
-unless the @code{execfail} shell option
-is enabled. In that case, it returns failure.
-An interactive shell returns failure if the file cannot be executed.
-If no @var{command} is specified, redirections may be used to affect
-the current shell environment. If there are no redirection errors, the
-return status is zero; otherwise the return status is non-zero.
-
-@item exit
-@btindex exit
-@example
-exit [@var{n}]
-@end example
-
-Exit the shell, returning a status of @var{n} to the shell's parent.
-If @var{n} is omitted, the exit status is that of the last command executed.
-Any trap on @code{EXIT} is executed before the shell terminates.
-
-@item export
-@btindex export
-@example
-export [-fn] [-p] [@var{name}[=@var{value}]]
-@end example
-
-Mark each @var{name} to be passed to child processes
-in the environment. If the @option{-f} option is supplied, the @var{name}s
-refer to shell functions; otherwise the names refer to shell variables.
-The @option{-n} option means to no longer mark each @var{name} for export.
-If no @var{names} are supplied, or if the @option{-p} option is given, a
-list of names of all exported variables is displayed.
-The @option{-p} option displays output in a form that may be reused as input.
-If a variable name is followed by =@var{value}, the value of
-the variable is set to @var{value}.
-
-The return status is zero unless an invalid option is supplied, one of
-the names is not a valid shell variable name, or @option{-f} is supplied
-with a name that is not a shell function.
-
-@item getopts
-@btindex getopts
-@example
-getopts @var{optstring} @var{name} [@var{args}]
-@end example
-
-@code{getopts} is used by shell scripts to parse positional parameters.
-@var{optstring} contains the option characters to be recognized; if a
-character is followed by a colon, the option is expected to have an
-argument, which should be separated from it by whitespace.
-The colon (@samp{:}) and question mark (@samp{?}) may not be
-used as option characters.
-Each time it is invoked, @code{getopts}
-places the next option in the shell variable @var{name}, initializing
-@var{name} if it does not exist,
-and the index of the next argument to be processed into the
-variable @env{OPTIND}.
-@env{OPTIND} is initialized to 1 each time the shell or a shell script
-is invoked.
-When an option requires an argument,
-@code{getopts} places that argument into the variable @env{OPTARG}.
-The shell does not reset @env{OPTIND} automatically; it must be manually
-reset between multiple calls to @code{getopts} within the same shell
-invocation if a new set of parameters is to be used.
-
-When the end of options is encountered, @code{getopts} exits with a
-return value greater than zero.
-@env{OPTIND} is set to the index of the first non-option argument,
-and @var{name} is set to @samp{?}.
-
-@code{getopts}
-normally parses the positional parameters, but if more arguments are
-given in @var{args}, @code{getopts} parses those instead.
-
-@code{getopts} can report errors in two ways. If the first character of
-@var{optstring} is a colon, @var{silent}
-error reporting is used. In normal operation, diagnostic messages
-are printed when invalid options or missing option arguments are
-encountered.
-If the variable @env{OPTERR}
-is set to 0, no error messages will be displayed, even if the first
-character of @code{optstring} is not a colon.
-
-If an invalid option is seen,
-@code{getopts} places @samp{?} into @var{name} and, if not silent,
-prints an error message and unsets @env{OPTARG}.
-If @code{getopts} is silent, the option character found is placed in
-@env{OPTARG} and no diagnostic message is printed.
-
-If a required argument is not found, and @code{getopts}
-is not silent, a question mark (@samp{?}) is placed in @var{name},
-@code{OPTARG} is unset, and a diagnostic message is printed.
-If @code{getopts} is silent, then a colon (@samp{:}) is placed in
-@var{name} and @env{OPTARG} is set to the option character found.
-
-@item hash
-@btindex hash
-@example
-hash [-r] [-p @var{filename}] [-dt] [@var{name}]
-@end example
-
-Each time @code{hash} is invoked, it remembers the full pathnames of the
-commands specified as @var{name} arguments,
-so they need not be searched for on subsequent invocations.
-The commands are found by searching through the directories listed in
-@env{$PATH}.
-Any previously-remembered pathname is discarded.
-The @option{-p} option inhibits the path search, and @var{filename} is
-used as the location of @var{name}.
-The @option{-r} option causes the shell to forget all remembered locations.
-The @option{-d} option causes the shell to forget the remembered location
-of each @var{name}.
-If the @option{-t} option is supplied, the full pathname to which each
-@var{name} corresponds is printed. If multiple @var{name} arguments are
-supplied with @option{-t} the @var{name} is printed before the hashed
-full pathname.
-The @option{-l} option causes output to be displayed in a format
-that may be reused as input.
-If no arguments are given, or if only @option{-l} is supplied,
-information about remembered commands is printed.
-The return status is zero unless a @var{name} is not found or an invalid
-option is supplied.
-
-@item pwd
-@btindex pwd
-@example
-pwd [-LP]
-@end example
-
-Print the absolute pathname of the current working directory.
-If the @option{-P} option is supplied, the pathname printed will not
-contain symbolic links.
-If the @option{-L} option is supplied, the pathname printed may contain
-symbolic links.
-The return status is zero unless an error is encountered while
-determining the name of the current directory or an invalid option
-is supplied.
-
-@item readonly
-@btindex readonly
-@example
-readonly [-aAf] [-p] [@var{name}[=@var{value}]] @dots{}
-@end example
-
-Mark each @var{name} as readonly.
-The values of these names may not be changed by subsequent assignment.
-If the @option{-f} option is supplied, each @var{name} refers to a shell
-function.
-The @option{-a} option means each @var{name} refers to an indexed
-array variable; the @option{-A} option means each @var{name} refers
-to an associative array variable.
-If both options are supplied, @option{-A} takes precedence.
-If no @var{name} arguments are given, or if the @option{-p}
-option is supplied, a list of all readonly names is printed.
-The other options may be used to restrict the output to a subset of
-the set of readonly names.
-The @option{-p} option causes output to be displayed in a format that
-may be reused as input.
-If a variable name is followed by =@var{value}, the value of
-the variable is set to @var{value}.
-The return status is zero unless an invalid option is supplied, one of
-the @var{name} arguments is not a valid shell variable or function name,
-or the @option{-f} option is supplied with a name that is not a shell function.
-
-@item return
-@btindex return
-@example
-return [@var{n}]
-@end example
-
-Cause a shell function to stop executing and return the value @var{n}
-to its caller.
-If @var{n} is not supplied, the return value is the exit status of the
-last command executed in the function.
-If @code{return} is executed by a trap handler, the last command used to
-determine the status is the last command executed before the trap handler.
-if @code{return} is executed during a @code{DEBUG} trap, the last command
-used to determine the status is the last command executed by the trap
-handler before @code{return} was invoked.
-@code{return} may also be used to terminate execution of a script
-being executed with the @code{.} (@code{source}) builtin,
-returning either @var{n} or
-the exit status of the last command executed within the script as the exit
-status of the script.
-If @var{n} is supplied, the return value is its least significant
-8 bits.
-Any command associated with the @code{RETURN} trap is executed
-before execution resumes after the function or script.
-The return status is non-zero if @code{return} is supplied a non-numeric
-argument or is used outside a function
-and not during the execution of a script by @code{.} or @code{source}.
-
-@item shift
-@btindex shift
-@example
-shift [@var{n}]
-@end example
-
-Shift the positional parameters to the left by @var{n}.
-The positional parameters from @var{n}+1 @dots{} @code{$#} are
-renamed to @code{$1} @dots{} @code{$#}-@var{n}.
-Parameters represented by the numbers @code{$#} to @code{$#}-@var{n}+1
-are unset.
-@var{n} must be a non-negative number less than or equal to @code{$#}.
-If @var{n} is zero or greater than @code{$#}, the positional parameters
-are not changed.
-If @var{n} is not supplied, it is assumed to be 1.
-The return status is zero unless @var{n} is greater than @code{$#} or
-less than zero, non-zero otherwise.
-
-@item test
-@itemx [
-@btindex test
-@btindex [
-@example
-test @var{expr}
-@end example
-
-Evaluate a conditional express
-ion @var{expr} and return a status of 0
-(true) or 1 (false).
-Each operator and operand must be a separate argument.
-Expressions are composed of the primaries described below in
-@ref{Bash Conditional Expressions}.
-@code{test} does not accept any options, nor does it accept and ignore
-an argument of @option{--} as signifying the end of options.
-
-When the @code{[} form is used, the last argument to the command must
-be a @code{]}.
-
-Expressions may be combined using the following operators, listed in
-decreasing order of precedence.
-The evaluation depends on the number of arguments; see below.
-Operator precedence is used when there are five or more arguments.
-
-@table @code
-@item ! @var{expr}
-True if @var{expr} is false.
-
-@item ( @var{expr} )
-Returns the value of @var{expr}.
-This may be used to override the normal precedence of operators.
-
-@item @var{expr1} -a @var{expr2}
-True if both @var{expr1} and @var{expr2} are true.
-
-@item @var{expr1} -o @var{expr2}
-True if either @var{expr1} or @var{expr2} is true.
-@end table
-
-The @code{test} and @code{[} builtins evaluate conditional
-expressions using a set of rules based on the number of arguments.
-
-@table @asis
-@item 0 arguments
-The expression is false.
-
-@item 1 argument
-The expression is true if and only if the argument is not null.
-
-@item 2 arguments
-If the first argument is @samp{!}, the expression is true if and
-only if the second argument is null.
-If the first argument is one of the unary conditional operators
-(@pxref{Bash Conditional Expressions}), the expression
-is true if the unary test is true.
-If the first argument is not a valid unary operator, the expression is
-false.
-
-@item 3 arguments
-The following conditions are applied in the order listed.
-If the second argument is one of the binary conditional
-operators (@pxref{Bash Conditional Expressions}), the
-result of the expression is the result of the binary test using the
-first and third arguments as operands.
-The @samp{-a} and @samp{-o} operators are considered binary operators
-when there are three arguments.
-If the first argument is @samp{!}, the value is the negation of
-the two-argument test using the second and third arguments.
-If the first argument is exactly @samp{(} and the third argument is
-exactly @samp{)}, the result is the one-argument test of the second
-argument.
-Otherwise, the expression is false.
-
-@item 4 arguments
-If the first argument is @samp{!}, the result is the negation of
-the three-argument expression composed of the remaining arguments.
-Otherwise, the expression is parsed and evaluated according to
-precedence using the rules listed above.
-
-@item 5 or more arguments
-The expression is parsed and evaluated according to precedence
-using the rules listed above.
-@end table
-
-When used with @code{test} or @samp{[}, the @samp{<} and @samp{>}
-operators sort lexicographically using ASCII ordering.
-
-@item times
-@btindex times
-@example
-times
-@end example
-
-Print out the user and system times used by the shell and its children.
-The return status is zero.
-
-@item trap
-@btindex trap
-@example
-trap [-lp] [@var{arg}] [@var{sigspec} @dots{}]
-@end example
-
-The commands in @var{arg} are to be read and executed when the
-shell receives signal @var{sigspec}. If @var{arg} is absent (and
-there is a single @var{sigspec}) or
-equal to @samp{-}, each specified signal's disposition is reset
-to the value it had when the shell was started.
-If @var{arg} is the null string, then the signal specified by
-each @var{sigspec} is ignored by the shell and commands it invokes.
-If @var{arg} is not present and @option{-p} has been supplied,
-the shell displays the trap commands associated with each @var{sigspec}.
-If no arguments are supplied, or
-only @option{-p} is given, @code{trap} prints the list of commands
-associated with each signal number in a form that may be reused as
-shell input.
-The @option{-l} option causes the shell to print a list of signal names
-and their corresponding numbers.
-Each @var{sigspec} is either a signal name or a signal number.
-Signal names are case insensitive and the @code{SIG} prefix is optional.
-
-If a @var{sigspec}
-is @code{0} or @code{EXIT}, @var{arg} is executed when the shell exits.
-If a @var{sigspec} is @code{DEBUG}, the command @var{arg} is executed
-before every simple command, @code{for} command, @code{case} command,
-@code{select} command, every arithmetic @code{for} command, and before
-the first command executes in a shell function.
-Refer to the description of the @code{extdebug} option to the
-@code{shopt} builtin (@pxref{The Shopt Builtin}) for details of its
-effect on the @code{DEBUG} trap.
-If a @var{sigspec} is @code{RETURN}, the command @var{arg} is executed
-each time a shell function or a script executed with the @code{.} or
-@code{source} builtins finishes executing.
-
-If a @var{sigspec} is @code{ERR}, the command @var{arg}
-is executed whenever
-a pipeline (which may consist of a single simple
-command), a list, or a compound command returns a
-non-zero exit status,
-subject to the following conditions.
-The @code{ERR} trap is not executed if the failed command is part of the
-command list immediately following an @code{until} or @code{while} keyword,
-part of the test following the @code{if} or @code{elif} reserved words,
-part of a command executed in a @code{&&} or @code{||} list
-except the command following the final @code{&&} or @code{||},
-any command in a pipeline but the last,
-or if the command's return
-status is being inverted using @code{!}.
-These are the same conditions obeyed by the @code{errexit} (@option{-e})
-option.
-
-Signals ignored upon entry to the shell cannot be trapped or reset.
-Trapped signals that are not being ignored are reset to their original
-values in a subshell or subshell environment when one is created.
-
-The return status is zero unless a @var{sigspec} does not specify a
-valid signal.
-
-@item umask
-@btindex umask
-@example
-umask [-p] [-S] [@var{mode}]
-@end example
-
-Set the shell process's file creation mask to @var{mode}. If
-@var{mode} begins with a digit, it is interpreted as an octal number;
-if not, it is interpreted as a symbolic mode mask similar
-to that accepted by the @code{chmod} command. If @var{mode} is
-omitted, the current value of the mask is printed. If the @option{-S}
-option is supplied without a @var{mode} argument, the mask is printed
-in a symbolic format.
-If the @option{-p} option is supplied, and @var{mode}
-is omitted, the output is in a form that may be reused as input.
-The return status is zero if the mode is successfully changed or if
-no @var{mode} argument is supplied, and non-zero otherwise.
-
-Note that when the mode is interpreted as an octal number, each number
-of the umask is subtracted from @code{7}. Thus, a umask of @code{022}
-results in permissions of @code{755}.
-
-@item unset
-@btindex unset
-@example
-unset [-fnv] [@var{name}]
-@end example
-
-Remove each variable or function @var{name}.
-If the @option{-v} option is given, each
-@var{name} refers to a shell variable and that variable is remvoved.
-If the @option{-f} option is given, the @var{name}s refer to shell
-functions, and the function definition is removed.
-If the @option{-n} option is supplied, and @var{name} is a variable with
-the @var{nameref} attribute, @var{name} will be unset rather than the
-variable it references.
-@option{-n} has no effect if the @option{-f} option is supplied.
-If no options are supplied, each @var{name} refers to a variable; if
-there is no variable by that name, any function with that name is
-unset.
-Readonly variables and functions may not be unset.
-The return status is zero unless a @var{name} is readonly.
-@end table
-
-@node Bash Builtins
-@section Bash Builtin Commands
-
-This section describes builtin commands which are unique to
-or have been extended in Bash.
-Some of these commands are specified in the @sc{posix} standard.
-
-@table @code
-
-@item alias
-@btindex alias
-@example
-alias [-p] [@var{name}[=@var{value}] @dots{}]
-@end example
-
-Without arguments or with the @option{-p} option, @code{alias} prints
-the list of aliases on the standard output in a form that allows
-them to be reused as input.
-If arguments are supplied, an alias is defined for each @var{name}
-whose @var{value} is given. If no @var{value} is given, the name
-and value of the alias is printed.
-Aliases are described in @ref{Aliases}.
-
-@item bind
-@btindex bind
-@example
-bind [-m @var{keymap}] [-lpsvPSVX]
-bind [-m @var{keymap}] [-q @var{function}] [-u @var{function}] [-r @var{keyseq}]
-bind [-m @var{keymap}] -f @var{filename}
-bind [-m @var{keymap}] -x @var{keyseq:shell-command}
-bind [-m @var{keymap}] @var{keyseq:function-name}
-bind [-m @var{keymap}] @var{keyseq:readline-command}
-@end example
-
-Display current Readline (@pxref{Command Line Editing})
-key and function bindings,
-bind a key sequence to a Readline function or macro,
-or set a Readline variable.
-Each non-option argument is a command as it would appear in a
-Readline initialization file (@pxref{Readline Init File}),
-but each binding or command must be passed as a separate argument; e.g.,
-@samp{"\C-x\C-r":re-read-init-file}.
-
-Options, if supplied, have the following meanings:
-
-@table @code
-@item -m @var{keymap}
-Use @var{keymap} as the keymap to be affected by
-the subsequent bindings. Acceptable @var{keymap}
-names are
-@code{emacs},
-@code{emacs-standard},
-@code{emacs-meta},
-@code{emacs-ctlx},
-@code{vi},
-@code{vi-move},
-@code{vi-command}, and
-@code{vi-insert}.
-@code{vi} is equivalent to @code{vi-command};
-@code{emacs} is equivalent to @code{emacs-standard}.
-
-@item -l
-List the names of all Readline functions.
-
-@item -p
-Display Readline function names and bindings in such a way that they
-can be used as input or in a Readline initialization file.
-
-@item -P
-List current Readline function names and bindings.
-
-@item -v
-Display Readline variable names and values in such a way that they
-can be used as input or in a Readline initialization file.
-
-@item -V
-List current Readline variable names and values.
-
-@item -s
-Display Readline key sequences bound to macros and the strings they output
-in such a way that they can be used as input or in a Readline
-initialization file.
-
-@item -S
-Display Readline key sequences bound to macros and the strings they output.
-
-@item -f @var{filename}
-Read key bindings from @var{filename}.
-
-@item -q @var{function}
-Query about which keys invoke the named @var{function}.
-
-@item -u @var{function}
-Unbind all keys bound to the named @var{function}.
-
-@item -r @var{keyseq}
-Remove any current binding for @var{keyseq}.
-
-@item -x @var{keyseq:shell-command}
-Cause @var{shell-command} to be executed whenever @var{keyseq} is
-entered.
-When @var{shell-command} is executed, the shell sets the
-@code{READLINE_LINE} variable to the contents of the Readline line
-buffer and the @code{READLINE_POINT} variable to the current location
-of the insertion point.
-If the executed command changes the value of @code{READLINE_LINE} or
-@code{READLINE_POINT}, those new values will be reflected in the
-editing state.
-
-@item -X
-List all key sequences bound to shell commands and the associated commands
-in a format that can be reused as input.
-@end table
-
-@noindent
-The return status is zero unless an invalid option is supplied or an
-error occurs.
-
-@item builtin
-@btindex builtin
-@example
-builtin [@var{shell-builtin} [@var{args}]]
-@end example
-
-Run a shell builtin, passing it @var{args}, and return its exit status.
-This is useful when defining a shell function with the same
-name as a shell builtin, retaining the functionality of the builtin within
-the function.
-The return status is non-zero if @var{shell-builtin} is not a shell
-builtin command.
-
-@item caller
-@btindex caller
-@example
-caller [@var{expr}]
-@end example
-
-Returns the context of any active subroutine call (a shell function or
-a script executed with the @code{.} or @code{source} builtins).
-
-Without @var{expr}, @code{caller} displays the line number and source
-filename of the current subroutine call.
-If a non-negative integer is supplied as @var{expr}, @code{caller}
-displays the line number, subroutine name, and source file corresponding
-to that position in the current execution call stack. This extra
-information may be used, for example, to print a stack trace. The
-current frame is frame 0.
-
-The return value is 0 unless the shell is not executing a subroutine
-call or @var{expr} does not correspond to a valid position in the
-call stack.
-
-@item command
-@btindex command
-@example
-command [-pVv] @var{command} [@var{arguments} @dots{}]
-@end example
-
-Runs @var{command} with @var{arguments} ignoring any shell function
-named @var{command}.
-Only shell builtin commands or commands found by searching the
-@env{PATH} are executed.
-If there is a shell function named @code{ls}, running @samp{command ls}
-within the function will execute the external command @code{ls}
-instead of calling the function recursively.
-The @option{-p} option means to use a default value for @env{PATH}
-that is guaranteed to find all of the standard utilities.
-The return status in this case is 127 if @var{command} cannot be
-found or an error occurred, and the exit status of @var{command}
-otherwise.
-
-If either the @option{-V} or @option{-v} option is supplied, a
-description of @var{command} is printed. The @option{-v} option
-causes a single word indicating the command or file name used to
-invoke @var{command} to be displayed; the @option{-V} option produces
-a more verbose description. In this case, the return status is
-zero if @var{command} is found, and non-zero if not.
-
-@item declare
-@btindex declare
-@example
-declare [-aAfFgilnrtux] [-p] [@var{name}[=@var{value}] @dots{}]
-@end example
-
-Declare variables and give them attributes. If no @var{name}s
-are given, then display the values of variables instead.
-
-The @option{-p} option will display the attributes and values of each
-@var{name}.
-When @option{-p} is used with @var{name} arguments, additional options,
-other than @option{-f} and @option{-F}, are ignored.
-
-When @option{-p} is supplied without @var{name} arguments, @code{declare}
-will display the attributes and values of all variables having the
-attributes specified by the additional options.
-If no other options are supplied with @option{-p}, @code{declare} will
-display the attributes and values of all shell variables. The @option{-f}
-option will restrict the display to shell functions.
-
-The @option{-F} option inhibits the display of function definitions;
-only the function name and attributes are printed.
-If the @code{extdebug} shell option is enabled using @code{shopt}
-(@pxref{The Shopt Builtin}), the source file name and line number where
-the function is defined are displayed as well.
-@option{-F} implies @option{-f}.
-
-The @option{-g} option forces variables to be created or modified at
-the global scope, even when @code{declare} is executed in a shell function.
-It is ignored in all other cases.
-
-The following options can be used to restrict output to variables with
-the specified attributes or to give variables attributes:
-
-@table @code
-@item -a
-Each @var{name} is an indexed array variable (@pxref{Arrays}).
-
-@item -A
-Each @var{name} is an associative array variable (@pxref{Arrays}).
-
-@item -f
-Use function names only.
-
-@item -i
-The variable is to be treated as
-an integer; arithmetic evaluation (@pxref{Shell Arithmetic}) is
-performed when the variable is assigned a value.
-
-@item -l
-When the variable is assigned a value, all upper-case characters are
-converted to lower-case.
-The upper-case attribute is disabled.
-
-@item -n
-Give each @var{name} the @var{nameref} attribute, making
-it a name reference to another variable.
-That other variable is defined by the value of @var{name}.
-All references, assignments, and attribute modifications
-to @var{name}, except for changing the
-@option{-n} attribute itself, are performed on the variable referenced by
-@var{name}'s value.
-The nameref attribute cannot be applied to array variables.
-
-@item -r
-Make @var{name}s readonly. These names cannot then be assigned values
-by subsequent assignment statements or unset.
-
-@item -t
-Give each @var{name} the @code{trace} attribute.
-Traced functions inherit the @code{DEBUG} and @code{RETURN} traps from
-the calling shell.
-The trace attribute has no special meaning for variables.
-
-@item -u
-When the variable is assigned a value, all lower-case characters are
-converted to upper-case.
-The lower-case attribute is disabled.
-
-@item -x
-Mark each @var{name} for export to subsequent commands via
-the environment.
-@end table
-
-Using @samp{+} instead of @samp{-} turns off the attribute instead,
-with the exceptions that @samp{+a}
-may not be used to destroy an array variable and @samp{+r} will not
-remove the readonly attribute.
-When used in a function, @code{declare} makes each @var{name} local,
-as with the @code{local} command, unless the @option{-g} option is used.
-If a variable name is followed by =@var{value}, the value of the variable
-is set to @var{value}.
-
-When using @option{-a} or @option{-A} and the compound assignment syntax to
-create array variables, additional attributes do not take effect until
-subsequent assignments.
-
-The return status is zero unless an invalid option is encountered,
-an attempt is made to define a function using @samp{-f foo=bar},
-an attempt is made to assign a value to a readonly variable,
-an attempt is made to assign a value to an array variable without
-using the compound assignment syntax (@pxref{Arrays}),
-one of the @var{names} is not a valid shell variable name,
-an attempt is made to turn off readonly status for a readonly variable,
-an attempt is made to turn off array status for an array variable,
-or an attempt is made to display a non-existent function with @option{-f}.
-
-@item echo
-@btindex echo
-@example
-echo [-neE] [@var{arg} @dots{}]
-@end example
-
-Output the @var{arg}s, separated by spaces, terminated with a
-newline.
-The return status is 0 unless a write error occurs.
-If @option{-n} is specified, the trailing newline is suppressed.
-If the @option{-e} option is given, interpretation of the following
-backslash-escaped characters is enabled.
-The @option{-E} option disables the interpretation of these escape characters,
-even on systems where they are interpreted by default.
-The @code{xpg_echo} shell option may be used to
-dynamically determine whether or not @code{echo} expands these
-escape characters by default.
-@code{echo} does not interpret @option{--} to mean the end of options.
-
-@code{echo} interprets the following escape sequences:
-@table @code
-@item \a
-alert (bell)
-@item \b
-backspace
-@item \c
-suppress further output
-@item \e
-@itemx \E
-escape
-@item \f
-form feed
-@item \n
-new line
-@item \r
-carriage return
-@item \t
-horizontal tab
-@item \v
-vertical tab
-@item \\
-backslash
-@item \0@var{nnn}
-the eight-bit character whose value is the octal value @var{nnn}
-(zero to three octal digits)
-@item \x@var{HH}
-the eight-bit character whose value is the hexadecimal value @var{HH}
-(one or two hex digits)
-@item \u@var{HHHH}
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-@var{HHHH} (one to four hex digits)
-@item \U@var{HHHHHHHH}
-the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value
-@var{HHHHHHHH} (one to eight hex digits)
-@end table
-
-@item enable
-@btindex enable
-@example
-enable [-a] [-dnps] [-f @var{filename}] [@var{name} @dots{}]
-@end example
-
-Enable and disable builtin shell commands.
-Disabling a builtin allows a disk command which has the same name
-as a shell builtin to be executed without specifying a full pathname,
-even though the shell normally searches for builtins before disk commands.
-If @option{-n} is used, the @var{name}s become disabled. Otherwise
-@var{name}s are enabled. For example, to use the @code{test} binary
-found via @env{$PATH} instead of the shell builtin version, type
-@samp{enable -n test}.
-
-If the @option{-p} option is supplied, or no @var{name} arguments appear,
-a list of shell builtins is printed. With no other arguments, the list
-consists of all enabled shell builtins.
-The @option{-a} option means to list
-each builtin with an indication of whether or not it is enabled.
-
-The @option{-f} option means to load the new builtin command @var{name}
-from shared object @var{filename}, on systems that support dynamic loading.
-The @option{-d} option will delete a builtin loaded with @option{-f}.
-
-If there are no options, a list of the shell builtins is displayed.
-The @option{-s} option restricts @code{enable} to the @sc{posix} special
-builtins. If @option{-s} is used with @option{-f}, the new builtin becomes
-a special builtin (@pxref{Special Builtins}).
-
-The return status is zero unless a @var{name} is not a shell builtin
-or there is an error loading a new builtin from a shared object.
-
-@item help
-@btindex help
-@example
-help [-dms] [@var{pattern}]
-@end example
-
-Display helpful information about builtin commands.
-If @var{pattern} is specified, @code{help} gives detailed help
-on all commands matching @var{pattern}, otherwise a list of
-the builtins is printed.
-
-Options, if supplied, have the following meanings:
-
-@table @code
-@item -d
-Display a short description of each @var{pattern}
-@item -m
-Display the description of each @var{pattern} in a manpage-like format
-@item -s
-Display only a short usage synopsis for each @var{pattern}
-@end table
-
-The return status is zero unless no command matches @var{pattern}.
-
-@item let
-@btindex let
-@example
-let @var{expression} [@var{expression} @dots{}]
-@end example
-
-The @code{let} builtin allows arithmetic to be performed on shell
-variables. Each @var{expression} is evaluated according to the
-rules given below in @ref{Shell Arithmetic}. If the
-last @var{expression} evaluates to 0, @code{let} returns 1;
-otherwise 0 is returned.
-
-@item local
-@btindex local
-@example
-local [@var{option}] @var{name}[=@var{value}] @dots{}
-@end example
-
-For each argument, a local variable named @var{name} is created,
-and assigned @var{value}.
-The @var{option} can be any of the options accepted by @code{declare}.
-@code{local} can only be used within a function; it makes the variable
-@var{name} have a visible scope restricted to that function and its
-children. The return status is zero unless @code{local} is used outside
-a function, an invalid @var{name} is supplied, or @var{name} is a
-readonly variable.
-
-@item logout
-@btindex logout
-@example
-logout [@var{n}]
-@end example
-
-Exit a login shell, returning a status of @var{n} to the shell's
-parent.
-
-@item mapfile
-@btindex mapfile
-@example
-mapfile [-d @var{delim}] [-n @var{count}] [-O @var{origin}] [-s @var{count}] [-t] [-u @var{fd}]
- [-C @var{callback}] [-c @var{quantum}] [@var{array}]
-@end example
-
-Read lines from the standard input into the indexed array variable @var{array},
-or from file descriptor @var{fd}
-if the @option{-u} option is supplied.
-The variable @code{MAPFILE} is the default @var{array}.
-Options, if supplied, have the following meanings:
-
-@table @code
-
-@item -d
-The first character of @var{delim} is used to terminate each input line,
-rather than newline.
-@item -n
-Copy at most @var{count} lines. If @var{count} is 0, all lines are copied.
-@item -O
-Begin assigning to @var{array} at index @var{origin}.
-The default index is 0.
-@item -s
-Discard the first @var{count} lines read.
-@item -t
-Remove a trailing newline from each line read.
-@item -u
-Read lines from file descriptor @var{fd} instead of the standard input.
-@item -C
-Evaluate @var{callback} each time @var{quantum}P lines are read.
-The @option{-c} option specifies @var{quantum}.
-@item -c
-Specify the number of lines read between each call to @var{callback}.
-@end table
-
-If @option{-C} is specified without @option{-c},
-the default quantum is 5000.
-When @var{callback} is evaluated, it is supplied the index of the next
-array element to be assigned and the line to be assigned to that element
-as additional arguments.
-@var{callback} is evaluated after the line is read but before the
-array element is assigned.
-
-If not supplied with an explicit origin, @code{mapfile} will clear @var{array}
-before assigning to it.
-
-@code{mapfile} returns successfully unless an invalid option or option
-argument is supplied, @var{array} is invalid or unassignable, or @var{array}
-is not an indexed array.
-
-@item printf
-@btindex printf
-@example
-printf [-v @var{var}] @var{format} [@var{arguments}]
-@end example
-
-Write the formatted @var{arguments} to the standard output under the
-control of the @var{format}.
-The @option{-v} option causes the output to be assigned to the variable
-@var{var} rather than being printed to the standard output.
-
-The @var{format} is a character string which contains three types of objects:
-plain characters, which are simply copied to standard output, character
-escape sequences, which are converted and copied to the standard output, and
-format specifications, each of which causes printing of the next successive
-@var{argument}.
-In addition to the standard @code{printf(1)} formats, @code{printf}
-interprets the following extensions:
-
-@table @code
-@item %b
-Causes @code{printf} to expand backslash escape sequences in the
-corresponding @var{argument},
-except that @samp{\c} terminates output, backslashes in
-@samp{\'}, @samp{\"}, and @samp{\?} are not removed, and octal escapes
-beginning with @samp{\0} may contain up to four digits.
-@item %q
-Causes @code{printf} to output the
-corresponding @var{argument} in a format that can be reused as shell input.
-@item %(@var{datefmt})T
-Causes @code{printf} to output the date-time string resulting from using
-@var{datefmt} as a format string for @code{strftime}(3).
-The corresponding @var{argument} is an integer representing the number of
-seconds since the epoch.
-Two special argument values may be used: -1 represents the current
-time, and -2 represents the time the shell was invoked.
-If no argument is specified, conversion behaves as if -1 had been given.
-This is an exception to the usual @code{printf} behavior.
-@end table
-
-@noindent
-Arguments to non-string format specifiers are treated as C language constants,
-except that a leading plus or minus sign is allowed, and if the leading
-character is a single or double quote, the value is the ASCII value of
-the following character.
-
-The @var{format} is reused as necessary to consume all of the @var{arguments}.
-If the @var{format} requires more @var{arguments} than are supplied, the
-extra format specifications behave as if a zero value or null string, as
-appropriate, had been supplied. The return value is zero on success,
-non-zero on failure.
-
-@item read
-@btindex read
-@example
-read [-ers] [-a @var{aname}] [-d @var{delim}] [-i @var{text}] [-n @var{nchars}]
- [-N @var{nchars}] [-p @var{prompt}] [-t @var{timeout}] [-u @var{fd}] [@var{name} @dots{}]
-@end example
-
-One line is read from the standard input, or from the file descriptor
-@var{fd} supplied as an argument to the @option{-u} option, and the first word
-is assigned to the first @var{name}, the second word to the second @var{name},
-and so on, with leftover words and their intervening separators assigned
-to the last @var{name}.
-If there are fewer words read from the input stream than names,
-the remaining names are assigned empty values.
-The characters in the value of the @env{IFS} variable
-are used to split the line into words using the same rules the shell
-uses for expansion (described above in @ref{Word Splitting}).
-The backslash character @samp{\} may be used to remove any special
-meaning for the next character read and for line continuation.
-If no names are supplied, the line read is assigned to the
-variable @env{REPLY}.
-The return code is zero, unless end-of-file is encountered, @code{read}
-times out (in which case the return code is greater than 128),
-a variable assignment error (such as assigning to a readonly variable) occurs,
-or an invalid file descriptor is supplied as the argument to @option{-u}.
-
-Options, if supplied, have the following meanings:
-
-@table @code
-@item -a @var{aname}
-The words are assigned to sequential indices of the array variable
-@var{aname}, starting at 0.
-All elements are removed from @var{aname} before the assignment.
-Other @var{name} arguments are ignored.
-
-@item -d @var{delim}
-The first character of @var{delim} is used to terminate the input line,
-rather than newline.
-
-@item -e
-Readline (@pxref{Command Line Editing}) is used to obtain the line.
-Readline uses the current (or default, if line editing was not previously
-active) editing settings.
-
-@item -i @var{text}
-If Readline is being used to read the line, @var{text} is placed into
-the editing buffer before editing begins.
-
-@item -n @var{nchars}
-@code{read} returns after reading @var{nchars} characters rather than
-waiting for a complete line of input, but honor a delimiter if fewer
-than @var{nchars} characters are read before the delimiter.
-
-@item -N @var{nchars}
-@code{read} returns after reading exactly @var{nchars} characters rather
-than waiting for a complete line of input, unless EOF is encountered or
-@code{read} times out.
-Delimiter characters encountered in the input are
-not treated specially and do not cause @code{read} to return until
-@var{nchars} characters are read.
-
-@item -p @var{prompt}
-Display @var{prompt}, without a trailing newline, before attempting
-to read any input.
-The prompt is displayed only if input is coming from a terminal.
-
-@item -r
-If this option is given, backslash does not act as an escape character.
-The backslash is considered to be part of the line.
-In particular, a backslash-newline pair may not be used as a line
-continuation.
-
-@item -s
-Silent mode. If input is coming from a terminal, characters are
-not echoed.
-
-@item -t @var{timeout}
-Cause @code{read} to time out and return failure if a complete line of
-input (or a specified number of characters)
-is not read within @var{timeout} seconds.
-@var{timeout} may be a decimal number with a fractional portion following
-the decimal point.
-This option is only effective if @code{read} is reading input from a
-terminal, pipe, or other special file; it has no effect when reading
-from regular files.
-If @code{read} times out, @code{read} saves any partial input read into
-the specified variable @var{name}.
-If @var{timeout} is 0, @code{read} returns immediately, without trying to
-read and data. The exit status is 0 if input is available on
-the specified file descriptor, non-zero otherwise.
-The exit status is greater than 128 if the timeout is exceeded.
-
-@item -u @var{fd}
-Read input from file descriptor @var{fd}.
-@end table
-
-@item readarray
-@btindex readarray
-@example
-readarray [-d @var{delim}] [-n @var{count}] [-O @var{origin}] [-s @var{count}] [-t] [-u @var{fd}]
- [-C @var{callback}] [-c @var{quantum}] [@var{array}]
-@end example
-
-Read lines from the standard input into the indexed array variable @var{array},
-or from file descriptor @var{fd}
-if the @option{-u} option is supplied.
-
-A synonym for @code{mapfile}.
-
-@item source
-@btindex source
-@example
-source @var{filename}
-@end example
-
-A synonym for @code{.} (@pxref{Bourne Shell Builtins}).
-
-@item type
-@btindex type
-@example
-type [-afptP] [@var{name} @dots{}]
-@end example
-
-For each @var{name}, indicate how it would be interpreted if used as a
-command name.
-
-If the @option{-t} option is used, @code{type} prints a single word
-which is one of @samp{alias}, @samp{function}, @samp{builtin},
-@samp{file} or @samp{keyword},
-if @var{name} is an alias, shell function, shell builtin,
-disk file, or shell reserved word, respectively.
-If the @var{name} is not found, then nothing is printed, and
-@code{type} returns a failure status.
-
-If the @option{-p} option is used, @code{type} either returns the name
-of the disk file that would be executed, or nothing if @option{-t}
-would not return @samp{file}.
-
-The @option{-P} option forces a path search for each @var{name}, even if
-@option{-t} would not return @samp{file}.
-
-If a command is hashed, @option{-p} and @option{-P} print the hashed value,
-which is not necessarily the file that appears first in @code{$PATH}.
-
-If the @option{-a} option is used, @code{type} returns all of the places
-that contain an executable named @var{file}.
-This includes aliases and functions, if and only if the @option{-p} option
-is not also used.
-
-If the @option{-f} option is used, @code{type} does not attempt to find
-shell functions, as with the @code{command} builtin.
-
-The return status is zero if all of the @var{names} are found, non-zero
-if any are not found.
-
-@item typeset
-@btindex typeset
-@example
-typeset [-afFgrxilnrtux] [-p] [@var{name}[=@var{value}] @dots{}]
-@end example
-
-The @code{typeset} command is supplied for compatibility with the Korn
-shell.
-It is a synonym for the @code{declare} builtin command.
-
-@item ulimit
-@btindex ulimit
-@example
-ulimit [-abcdefilmnpqrstuvxHST] [@var{limit}]
-@end example
-
-@code{ulimit} provides control over the resources available to processes
-started by the shell, on systems that allow such control. If an
-option is given, it is interpreted as follows:
-
-@table @code
-@item -S
-Change and report the soft limit associated with a resource.
-
-@item -H
-Change and report the hard limit associated with a resource.
-
-@item -a
-All current limits are reported.
-
-@item -b
-The maximum socket buffer size.
-
-@item -c
-The maximum size of core files created.
-
-@item -d
-The maximum size of a process's data segment.
-
-@item -e
-The maximum scheduling priority ("nice").
-
-@item -f
-The maximum size of files written by the shell and its children.
-
-@item -i
-The maximum number of pending signals.
-
-@item -l
-The maximum size that may be locked into memory.
-
-@item -m
-The maximum resident set size (many systems do not honor this limit).
-
-@item -n
-The maximum number of open file descriptors (most systems do not
-allow this value to be set).
-
-@item -p
-The pipe buffer size.
-
-@item -q
-The maximum number of bytes in POSIX message queues.
-
-@item -r
-The maximum real-time scheduling priority.
-
-@item -s
-The maximum stack size.
-
-@item -t
-The maximum amount of cpu time in seconds.
-
-@item -u
-The maximum number of processes available to a single user.
-
-@item -v
-The maximum amount of virtual memory available to the shell, and, on
-some systems, to its children.
-
-@item -x
-The maximum number of file locks.
-
-@item -T
-The maximum number of threads.
-@end table
-
-If @var{limit} is given, and the @option{-a} option is not used,
-@var{limit} is the new value of the specified resource.
-The special @var{limit} values @code{hard}, @code{soft}, and
-@code{unlimited} stand for the current hard limit, the current soft limit,
-and no limit, respectively.
-A hard limit cannot be increased by a non-root user once it is set;
-a soft limit may be increased up to the value of the hard limit.
-Otherwise, the current value of the soft limit for the specified resource
-is printed, unless the @option{-H} option is supplied.
-When setting new limits, if neither @option{-H} nor @option{-S} is supplied,
-both the hard and soft limits are set.
-If no option is given, then @option{-f} is assumed. Values are in 1024-byte
-increments, except for @option{-t}, which is in seconds; @option{-p},
-which is in units of 512-byte blocks; and @option{-T}, @option{-b},
-@option{-n} and @option{-u}, which are unscaled values.
-
-The return status is zero unless an invalid option or argument is supplied,
-or an error occurs while setting a new limit.
-
-@item unalias
-@btindex unalias
-@example
-unalias [-a] [@var{name} @dots{} ]
-@end example
-
-Remove each @var{name} from the list of aliases. If @option{-a} is
-supplied, all aliases are removed.
-Aliases are described in @ref{Aliases}.
-@end table
-
-@node Modifying Shell Behavior
-@section Modifying Shell Behavior
-
-@menu
-* The Set Builtin:: Change the values of shell attributes and
- positional parameters.
-* The Shopt Builtin:: Modify shell optional behavior.
-@end menu
-
-@node The Set Builtin
-@subsection The Set Builtin
-
-This builtin is so complicated that it deserves its own section. @code{set}
-allows you to change the values of shell options and set the positional
-parameters, or to display the names and values of shell variables.
-
-@table @code
-@item set
-@btindex set
-@example
-set [--abefhkmnptuvxBCEHPT] [-o @var{option-name}] [@var{argument} @dots{}]
-set [+abefhkmnptuvxBCEHPT] [+o @var{option-name}] [@var{argument} @dots{}]
-@end example
-
-If no options or arguments are supplied, @code{set} displays the names
-and values of all shell variables and functions, sorted according to the
-current locale, in a format that may be reused as input
-for setting or resetting the currently-set variables.
-Read-only variables cannot be reset.
-In @sc{posix} mode, only shell variables are listed.
-
-When options are supplied, they set or unset shell attributes.
-Options, if specified, have the following meanings:
-
-@table @code
-@item -a
-Mark variables and function which are modified or created for export
-to the environment of subsequent commands.
-
-@item -b
-Cause the status of terminated background jobs to be reported
-immediately, rather than before printing the next primary prompt.
-
-@item -e
-Exit immediately if
-a pipeline (@pxref{Pipelines}), which may consist of a single simple command
-(@pxref{Simple Commands}),
-a list (@pxref{Lists}),
-or a compound command (@pxref{Compound Commands})
-returns a non-zero status.
-The shell does not exit if the command that fails is part of the
-command list immediately following a @code{while} or @code{until} keyword,
-part of the test in an @code{if} statement,
-part of any command executed in a @code{&&} or @code{||} list except
-the command following the final @code{&&} or @code{||},
-any command in a pipeline but the last,
-or if the command's return status is being inverted with @code{!}.
-If a compound command other than a subshell
-returns a non-zero status because a command failed
-while @option{-e} was being ignored, the shell does not exit.
-A trap on @code{ERR}, if set, is executed before the shell exits.
-
-This option applies to the shell environment and each subshell environment
-separately (@pxref{Command Execution Environment}), and may cause
-subshells to exit before executing all the commands in the subshell.
-
-If a compound command or shell function executes in a context where
-@option{-e} is being ignored,
-none of the commands executed within the compound command or function body
-will be affected by the @option{-e} setting, even if @option{-e} is set
-and a command returns a failure status.
-If a compound command or shell function sets @option{-e} while executing in
-a context where @option{-e} is ignored, that setting will not have any
-effect until the compound command or the command containing the function
-call completes.
-
-@item -f
-Disable filename expansion (globbing).
-
-@item -h
-Locate and remember (hash) commands as they are looked up for execution.
-This option is enabled by default.
-
-@item -k
-All arguments in the form of assignment statements are placed
-in the environment for a command, not just those that precede
-the command name.
-
-@item -m
-Job control is enabled (@pxref{Job Control}).
-All processes run in a separate process group.
-When a background job completes, the shell prints a line
-containing its exit status.
-
-@item -n
-Read commands but do not execute them; this may be used to check a
-script for syntax errors.
-This option is ignored by interactive shells.
-
-@item -o @var{option-name}
-
-Set the option corresponding to @var{option-name}:
-
-@table @code
-@item allexport
-Same as @code{-a}.
-
-@item braceexpand
-Same as @code{-B}.
-
-@item emacs
-Use an @code{emacs}-style line editing interface (@pxref{Command Line Editing}).
-This also affects the editing interface used for @code{read -e}.
-
-@item errexit
-Same as @code{-e}.
-
-@item errtrace
-Same as @code{-E}.
-
-@item functrace
-Same as @code{-T}.
-
-@item hashall
-Same as @code{-h}.
-
-@item histexpand
-Same as @code{-H}.
-
-@item history
-Enable command history, as described in @ref{Bash History Facilities}.
-This option is on by default in interactive shells.
-
-@item ignoreeof
-An interactive shell will not exit upon reading EOF.
-
-@item keyword
-Same as @code{-k}.
-
-@item monitor
-Same as @code{-m}.
-
-@item noclobber
-Same as @code{-C}.
-
-@item noexec
-Same as @code{-n}.
-
-@item noglob
-Same as @code{-f}.
-
-@item nolog
-Currently ignored.
-
-@item notify
-Same as @code{-b}.
-
-@item nounset
-Same as @code{-u}.
-
-@item onecmd
-Same as @code{-t}.
-
-@item physical
-Same as @code{-P}.
-
-@item pipefail
-If set, the return value of a pipeline is the value of the last
-(rightmost) command to exit with a non-zero status, or zero if all
-commands in the pipeline exit successfully.
-This option is disabled by default.
-
-@item posix
-Change the behavior of Bash where the default operation differs
-from the @sc{posix} standard to match the standard
-(@pxref{Bash POSIX Mode}).
-This is intended to make Bash behave as a strict superset of that
-standard.
-
-@item privileged
-Same as @code{-p}.
-
-@item verbose
-Same as @code{-v}.
-
-@item vi
-Use a @code{vi}-style line editing interface.
-This also affects the editing interface used for @code{read -e}.
-
-@item xtrace
-Same as @code{-x}.
-@end table
-
-@item -p
-Turn on privileged mode.
-In this mode, the @env{$BASH_ENV} and @env{$ENV} files are not
-processed, shell functions are not inherited from the environment,
-and the @env{SHELLOPTS}, @env{BASHOPTS}, @env{CDPATH} and @env{GLOBIGNORE}
-variables, if they appear in the environment, are ignored.
-If the shell is started with the effective user (group) id not equal to the
-real user (group) id, and the @option{-p} option is not supplied, these actions
-are taken and the effective user id is set to the real user id.
-If the @option{-p} option is supplied at startup, the effective user id is
-not reset.
-Turning this option off causes the effective user
-and group ids to be set to the real user and group ids.
-
-@item -t
-Exit after reading and executing one command.
-
-@item -u
-Treat unset variables and parameters other than the special parameters
-@samp{@@} or @samp{*} as an error when performing parameter expansion.
-An error message will be written to the standard error, and a non-interactive
-shell will exit.
-
-@item -v
-Print shell input lines as they are read.
-
-@item -x
-Print a trace of simple commands, @code{for} commands, @code{case}
-commands, @code{select} commands, and arithmetic @code{for} commands
-and their arguments or associated word lists after they are
-expanded and before they are executed. The value of the @env{PS4}
-variable is expanded and the resultant value is printed before
-the command and its expanded arguments.
-
-@item -B
-The shell will perform brace expansion (@pxref{Brace Expansion}).
-This option is on by default.
-
-@item -C
-Prevent output redirection using @samp{>}, @samp{>&}, and @samp{<>}
-from overwriting existing files.
-
-@item -E
-If set, any trap on @code{ERR} is inherited by shell functions, command
-substitutions, and commands executed in a subshell environment.
-The @code{ERR} trap is normally not inherited in such cases.
-
-@item -H
-Enable @samp{!} style history substitution (@pxref{History Interaction}).
-This option is on by default for interactive shells.
-
-@item -P
-If set, do not resolve symbolic links when performing commands such as
-@code{cd} which change the current directory. The physical directory
-is used instead. By default, Bash follows
-the logical chain of directories when performing commands
-which change the current directory.
-
-For example, if @file{/usr/sys} is a symbolic link to @file{/usr/local/sys}
-then:
-@example
-$ cd /usr/sys; echo $PWD
-/usr/sys
-$ cd ..; pwd
-/usr
-@end example
-
-@noindent
-If @code{set -P} is on, then:
-@example
-$ cd /usr/sys; echo $PWD
-/usr/local/sys
-$ cd ..; pwd
-/usr/local
-@end example
-
-@item -T
-If set, any trap on @code{DEBUG} and @code{RETURN} are inherited by
-shell functions, command substitutions, and commands executed
-in a subshell environment.
-The @code{DEBUG} and @code{RETURN} traps are normally not inherited
-in such cases.
-
-@item --
-If no arguments follow this option, then the positional parameters are
-unset. Otherwise, the positional parameters are set to the
-@var{arguments}, even if some of them begin with a @samp{-}.
-
-@item -
-Signal the end of options, cause all remaining @var{arguments}
-to be assigned to the positional parameters. The @option{-x}
-and @option{-v} options are turned off.
-If there are no arguments, the positional parameters remain unchanged.
-@end table
-
-Using @samp{+} rather than @samp{-} causes these options to be
-turned off. The options can also be used upon invocation of the
-shell. The current set of options may be found in @code{$-}.
-
-The remaining N @var{arguments} are positional parameters and are
-assigned, in order, to @code{$1}, @code{$2}, @dots{} @code{$N}.
-The special parameter @code{#} is set to N.
-
-The return status is always zero unless an invalid option is supplied.
-@end table
-
-@node The Shopt Builtin
-@subsection The Shopt Builtin
-
-This builtin allows you to change additional shell optional behavior.
-
-@table @code
-
-@item shopt
-@btindex shopt
-@example
-shopt [-pqsu] [-o] [@var{optname} @dots{}]
-@end example
-
-Toggle the values of settings controlling optional shell behavior.
-The settings can be either those listed below, or, if the
-@option{-o} option is used, those available with the @option{-o}
-option to the @code{set} builtin command (@pxref{The Set Builtin}).
-With no options, or with the @option{-p} option, a list of all settable
-options is displayed, with an indication of whether or not each is set.
-The @option{-p} option causes output to be displayed in a form that
-may be reused as input.
-Other options have the following meanings:
-
-@table @code
-@item -s
-Enable (set) each @var{optname}.
-
-@item -u
-Disable (unset) each @var{optname}.
-
-@item -q
-Suppresses normal output; the return status
-indicates whether the @var{optname} is set or unset.
-If multiple @var{optname} arguments are given with @option{-q},
-the return status is zero if all @var{optnames} are enabled;
-non-zero otherwise.
-
-@item -o
-Restricts the values of
-@var{optname} to be those defined for the @option{-o} option to the
-@code{set} builtin (@pxref{The Set Builtin}).
-@end table
-
-If either @option{-s} or @option{-u}
-is used with no @var{optname} arguments, @code{shopt} shows only
-those options which are set or unset, respectively.
-
-Unless otherwise noted, the @code{shopt} options are disabled (off)
-by default.
-
-The return status when listing options is zero if all @var{optnames}
-are enabled, non-zero otherwise. When setting or unsetting options,
-the return status is zero unless an @var{optname} is not a valid shell
-option.
-
-The list of @code{shopt} options is:
-@table @code
-
-@item autocd
-If set, a command name that is the name of a directory is executed as if
-it were the argument to the @code{cd} command.
-This option is only used by interactive shells.
-
-@item cdable_vars
-If this is set, an argument to the @code{cd} builtin command that
-is not a directory is assumed to be the name of a variable whose
-value is the directory to change to.
-
-@item cdspell
-If set, minor errors in the spelling of a directory component in a
-@code{cd} command will be corrected.
-The errors checked for are transposed characters,
-a missing character, and a character too many.
-If a correction is found, the corrected path is printed,
-and the command proceeds.
-This option is only used by interactive shells.
-
-@item checkhash
-If this is set, Bash checks that a command found in the hash
-table exists before trying to execute it. If a hashed command no
-longer exists, a normal path search is performed.
-
-@item checkjobs
-If set, Bash lists the status of any stopped and running jobs before
-exiting an interactive shell. If any jobs are running, this causes
-the exit to be deferred until a second exit is attempted without an
-intervening command (@pxref{Job Control}).
-The shell always postpones exiting if any jobs are stopped.
-
-@item checkwinsize
-If set, Bash checks the window size after each command
- and, if necessary, updates the values of
-@env{LINES} and @env{COLUMNS}.
-
-@item cmdhist
-If set, Bash
-attempts to save all lines of a multiple-line
-command in the same history entry. This allows
-easy re-editing of multi-line commands.
-
-@item compat31
-If set, Bash
-changes its behavior to that of version 3.1 with respect to quoted
-arguments to the conditional command's @samp{=~} operator
-and with respect to locale-specific
-string comparison when using the @code{[[}
-conditional command's @samp{<} and @samp{>} operators.
-Bash versions prior to bash-4.1 use ASCII collation and strcmp(3);
-bash-4.1 and later use the current locale's collation sequence and strcoll(3).
-
-@item compat32
-If set, Bash
-changes its behavior to that of version 3.2 with respect to locale-specific
-string comparison when using the @code{[[}
-conditional command's @samp{<} and @samp{>} operators (see previous item).
-
-@item compat40
-If set, Bash
-changes its behavior to that of version 4.0 with respect to locale-specific
-string comparison when using the @code{[[}
-conditional command's @samp{<} and @samp{>} operators (see description
-of @code{compat31})
-and the effect of interrupting a command list.
-Bash versions 4.0 and later interrupt the list as if the shell received the
-interrupt; previous versions continue with the next command in the list.
-
-@item compat41
-If set, Bash, when in @sc{posix} mode, treats a single quote in a double-quoted
-parameter expansion as a special character. The single quotes must match
-(an even number) and the characters between the single quotes are considered
-quoted. This is the behavior of @sc{posix} mode through version 4.1.
-The default Bash behavior remains as in previous versions.
-
-@item compat42
-If set, Bash
-does not process the replacement string in the pattern substitution word
-expansion using quote removal.
-
-@item complete_fullquote
-If set, Bash
-quotes all shell metacharacters in filenames and directory names when
-performing completion.
-If not set, Bash
-removes metacharacters such as the dollar sign from the set of
-characters that will be quoted in completed filenames
-when these metacharacters appear in shell variable references in words to be
-completed.
-This means that dollar signs in variable names that expand to directories
-will not be quoted;
-however, any dollar signs appearing in filenames will not be quoted, either.
-This is active only when bash is using backslashes to quote completed
-filenames.
-This variable is set by default, which is the default Bash behavior in
-versions through 4.2.
-
-@item direxpand
-If set, Bash
-replaces directory names with the results of word expansion when performing
-filename completion. This changes the contents of the readline editing
-buffer.
-If not set, Bash attempts to preserve what the user typed.
-
-@item dirspell
-If set, Bash
-attempts spelling correction on directory names during word completion
-if the directory name initially supplied does not exist.
-
-@item dotglob
-If set, Bash includes filenames beginning with a `.' in
-the results of filename expansion.
-
-@item execfail
-If this is set, a non-interactive shell will not exit if
-it cannot execute the file specified as an argument to the @code{exec}
-builtin command. An interactive shell does not exit if @code{exec}
-fails.
-
-@item expand_aliases
-If set, aliases are expanded as described below under Aliases,
-@ref{Aliases}.
-This option is enabled by default for interactive shells.
-
-@item extdebug
-If set, behavior intended for use by debuggers is enabled:
-
-@enumerate
-@item
-The @option{-F} option to the @code{declare} builtin (@pxref{Bash Builtins})
-displays the source file name and line number corresponding to each function
-name supplied as an argument.
-
-@item
-If the command run by the @code{DEBUG} trap returns a non-zero value, the
-next command is skipped and not executed.
-
-@item
-If the command run by the @code{DEBUG} trap returns a value of 2, and the
-shell is executing in a subroutine (a shell function or a shell script
-executed by the @code{.} or @code{source} builtins), the shell simulates
-a call to @code{return}.
-
-@item
-@code{BASH_ARGC} and @code{BASH_ARGV} are updated as described in their
-descriptions (@pxref{Bash Variables}).
-
-@item
-Function tracing is enabled: command substitution, shell functions, and
-subshells invoked with @code{( @var{command} )} inherit the
-@code{DEBUG} and @code{RETURN} traps.
-
-@item
-Error tracing is enabled: command substitution, shell functions, and
-subshells invoked with @code{( @var{command} )} inherit the
-@code{ERR} trap.
-@end enumerate
-
-@item extglob
-If set, the extended pattern matching features described above
-(@pxref{Pattern Matching}) are enabled.
-
-@item extquote
-If set, @code{$'@var{string}'} and @code{$"@var{string}"} quoting is
-performed within @code{$@{@var{parameter}@}} expansions
-enclosed in double quotes. This option is enabled by default.
-
-@item failglob
-If set, patterns which fail to match filenames during filename expansion
-result in an expansion error.
-
-@item force_fignore
-If set, the suffixes specified by the @env{FIGNORE} shell variable
-cause words to be ignored when performing word completion even if
-the ignored words are the only possible completions.
-@xref{Bash Variables}, for a description of @env{FIGNORE}.
-This option is enabled by default.
-
-@item globasciiranges
-If set, range expressions used in pattern matching bracket expressions
-(@pxref{Pattern Matching})
-behave as if in the traditional C locale when performing
-comparisons. That is, the current locale's collating sequence
-is not taken into account, so
-@samp{b} will not collate between @samp{A} and @samp{B},
-and upper-case and lower-case ASCII characters will collate together.
-
-@item globstar
-If set, the pattern @samp{**} used in a filename expansion context will
-match all files and zero or more directories and subdirectories.
-If the pattern is followed by a @samp{/}, only directories and
-subdirectories match.
-
-@item gnu_errfmt
-If set, shell error messages are written in the standard @sc{gnu} error
-message format.
-
-@item histappend
-If set, the history list is appended to the file named by the value
-of the @env{HISTFILE}
-variable when the shell exits, rather than overwriting the file.
-
-@item histreedit
-If set, and Readline
-is being used, a user is given the opportunity to re-edit a
-failed history substitution.
-
-@item histverify
-If set, and Readline
-is being used, the results of history substitution are not immediately
-passed to the shell parser. Instead, the resulting line is loaded into
-the Readline editing buffer, allowing further modification.
-
-@item hostcomplete
-If set, and Readline is being used, Bash will attempt to perform
-hostname completion when a word containing a @samp{@@} is being
-completed (@pxref{Commands For Completion}). This option is enabled
-by default.
-
-@item huponexit
-If set, Bash will send @code{SIGHUP} to all jobs when an interactive
-login shell exits (@pxref{Signals}).
-
-@item interactive_comments
-Allow a word beginning with @samp{#}
-to cause that word and all remaining characters on that
-line to be ignored in an interactive shell.
-This option is enabled by default.
-
-@item lastpipe
-If set, and job control is not active, the shell runs the last command of
-a pipeline not executed in the background in the current shell environment.
-
-@item lithist
-If enabled, and the @code{cmdhist}
-option is enabled, multi-line commands are saved to the history with
-embedded newlines rather than using semicolon separators where possible.
-
-@item login_shell
-The shell sets this option if it is started as a login shell
-(@pxref{Invoking Bash}).
-The value may not be changed.
-
-@item mailwarn
-If set, and a file that Bash is checking for mail has been
-accessed since the last time it was checked, the message
-@code{"The mail in @var{mailfile} has been read"} is displayed.
-
-@item no_empty_cmd_completion
-If set, and Readline is being used, Bash will not attempt to search
-the @env{PATH} for possible completions when completion is attempted
-on an empty line.
-
-@item nocaseglob
-If set, Bash matches filenames in a case-insensitive fashion when
-performing filename expansion.
-
-@item nocasematch
-If set, Bash matches patterns in a case-insensitive fashion when
-performing matching while executing @code{case} or @code{[[}
-conditional commands.
-
-@item nullglob
-If set, Bash allows filename patterns which match no
-files to expand to a null string, rather than themselves.
-
-@item progcomp
-If set, the programmable completion facilities
-(@pxref{Programmable Completion}) are enabled.
-This option is enabled by default.
-
-@item promptvars
-If set, prompt strings undergo
-parameter expansion, command substitution, arithmetic
-expansion, and quote removal after being expanded
-as described below (@pxref{Controlling the Prompt}).
-This option is enabled by default.
-
-@item restricted_shell
-The shell sets this option if it is started in restricted mode
-(@pxref{The Restricted Shell}).
-The value may not be changed.
-This is not reset when the startup files are executed, allowing
-the startup files to discover whether or not a shell is restricted.
-
-@item shift_verbose
-If this is set, the @code{shift}
-builtin prints an error message when the shift count exceeds the
-number of positional parameters.
-
-@item sourcepath
-If set, the @code{source} builtin uses the value of @env{PATH}
-to find the directory containing the file supplied as an argument.
-This option is enabled by default.
-
-@item xpg_echo
-If set, the @code{echo} builtin expands backslash-escape sequences
-by default.
-
-@end table
-
-@noindent
-The return status when listing options is zero if all @var{optnames}
-are enabled, non-zero otherwise.
-When setting or unsetting options, the return status is zero unless an
-@var{optname} is not a valid shell option.
-@end table
-
-@node Special Builtins
-@section Special Builtins
-@cindex special builtin
-
-For historical reasons, the @sc{posix} standard has classified
-several builtin commands as @emph{special}.
-When Bash is executing in @sc{posix} mode, the special builtins
-differ from other builtin commands in three respects:
-
-@enumerate
-@item
-Special builtins are found before shell functions during command lookup.
-
-@item
-If a special builtin returns an error status, a non-interactive shell exits.
-
-@item
-Assignment statements preceding the command stay in effect in the shell
-environment after the command completes.
-@end enumerate
-
-When Bash is not executing in @sc{posix} mode, these builtins behave no
-differently than the rest of the Bash builtin commands.
-The Bash @sc{posix} mode is described in @ref{Bash POSIX Mode}.
-
-These are the @sc{posix} special builtins:
-@example
-@w{break : . continue eval exec exit export readonly return set}
-@w{shift trap unset}
-@end example
-
-@node Shell Variables
-@chapter Shell Variables
-
-@menu
-* Bourne Shell Variables:: Variables which Bash uses in the same way
- as the Bourne Shell.
-* Bash Variables:: List of variables that exist in Bash.
-@end menu
-
-This chapter describes the shell variables that Bash uses.
-Bash automatically assigns default values to a number of variables.
-
-@node Bourne Shell Variables
-@section Bourne Shell Variables
-
-Bash uses certain shell variables in the same way as the Bourne shell.
-In some cases, Bash assigns a default value to the variable.
-
-@vtable @code
-
-@item CDPATH
-A colon-separated list of directories used as a search path for
-the @code{cd} builtin command.
-
-@item HOME
-The current user's home directory; the default for the @code{cd} builtin
-command.
-The value of this variable is also used by tilde expansion
-(@pxref{Tilde Expansion}).
-
-@item IFS
-A list of characters that separate fields; used when the shell splits
-words as part of expansion.
-
-@item MAIL
-If this parameter is set to a filename or directory name
-and the @env{MAILPATH} variable
-is not set, Bash informs the user of the arrival of mail in
-the specified file or Maildir-format directory.
-
-@item MAILPATH
-A colon-separated list of filenames which the shell periodically checks
-for new mail.
-Each list entry can specify the message that is printed when new mail
-arrives in the mail file by separating the filename from the message with
-a @samp{?}.
-When used in the text of the message, @code{$_} expands to the name of
-the current mail file.
-
-@item OPTARG
-The value of the last option argument processed by the @code{getopts} builtin.
-
-@item OPTIND
-The index of the last option argument processed by the @code{getopts} builtin.
-
-@item PATH
-A colon-separated list of directories in which the shell looks for
-commands.
-A zero-length (null) directory name in the value of @code{PATH} indicates the
-current directory.
-A null directory name may appear as two adjacent colons, or as an initial
-or trailing colon.
-
-
-@item PS1
-The primary prompt string. The default value is @samp{\s-\v\$ }.
-@xref{Controlling the Prompt}, for the complete list of escape
-sequences that are expanded before @env{PS1} is displayed.
-
-@item PS2
-The secondary prompt string. The default value is @samp{> }.
-
-@end vtable
-
-@node Bash Variables
-@section Bash Variables
-
-These variables are set or used by Bash, but other shells
-do not normally treat them specially.
-
-A few variables used by Bash are described in different chapters:
-variables for controlling the job control facilities
-(@pxref{Job Control Variables}).
-
-@vtable @code
-
-@item BASH
-The full pathname used to execute the current instance of Bash.
-
-@item BASHOPTS
-A colon-separated list of enabled shell options. Each word in
-the list is a valid argument for the @option{-s} option to the
-@code{shopt} builtin command (@pxref{The Shopt Builtin}).
-The options appearing in @env{BASHOPTS} are those reported
-as @samp{on} by @samp{shopt}.
-If this variable is in the environment when Bash
-starts up, each shell option in the list will be enabled before
-reading any startup files. This variable is readonly.
-
-@item BASHPID
-Expands to the process ID of the current Bash process.
-This differs from @code{$$} under certain circumstances, such as subshells
-that do not require Bash to be re-initialized.
-
-@item BASH_ALIASES
-An associative array variable whose members correspond to the internal
-list of aliases as maintained by the @code{alias} builtin.
-(@pxref{Bourne Shell Builtins}).
-Elements added to this array appear in the alias list; unsetting array
-elements cause aliases to be removed from the alias list.
-
-@item BASH_ARGC
-An array variable whose values are the number of parameters in each
-frame of the current bash execution call stack. The number of
-parameters to the current subroutine (shell function or script executed
-with @code{.} or @code{source}) is at the top of the stack. When a
-subroutine is executed, the number of parameters passed is pushed onto
-@code{BASH_ARGC}.
-The shell sets @code{BASH_ARGC} only when in extended debugging mode
-(see @ref{The Shopt Builtin}
-for a description of the @code{extdebug} option to the @code{shopt}
-builtin).
-
-@item BASH_ARGV
-An array variable containing all of the parameters in the current bash
-execution call stack. The final parameter of the last subroutine call
-is at the top of the stack; the first parameter of the initial call is
-at the bottom. When a subroutine is executed, the parameters supplied
-are pushed onto @code{BASH_ARGV}.
-The shell sets @code{BASH_ARGV} only when in extended debugging mode
-(see @ref{The Shopt Builtin}
-for a description of the @code{extdebug} option to the @code{shopt}
-builtin).
-
-@item BASH_CMDS
-An associative array variable whose members correspond to the internal
-hash table of commands as maintained by the @code{hash} builtin
-(@pxref{Bourne Shell Builtins}).
-Elements added to this array appear in the hash table; unsetting array
-elements cause commands to be removed from the hash table.
-
-@item BASH_COMMAND
-The command currently being executed or about to be executed, unless the
-shell is executing a command as the result of a trap,
-in which case it is the command executing at the time of the trap.
-
-@item BASH_COMPAT
-The value is used to set the shell's compatibility level.
-@xref{The Shopt Builtin}, for a description of the various compatibility
-levels and their effects.
-The value may be a decimal number (e.g., 4.2) or an integer (e.g., 42)
-corresponding to the desired compatibility level.
-If @code{BASH_COMPAT} is unset or set to the empty string, the compatibility
-level is set to the default for the current version.
-If @code{BASH_COMPAT} is set to a value that is not one of the valid
-compatibility levels, the shell prints an error message and sets the
-compatibility level to the default for the current version.
-The valid compatibility levels correspond to the compatibility options
-accepted by the @code{shopt} builtin described above (for example,
-@var{compat42} means that 4.2 and 42 are valid values).
-The current version is also a valid value.
-
-@item BASH_ENV
-If this variable is set when Bash is invoked to execute a shell
-script, its value is expanded and used as the name of a startup file
-to read before executing the script. @xref{Bash Startup Files}.
-
-@item BASH_EXECUTION_STRING
-The command argument to the @option{-c} invocation option.
-
-@item BASH_LINENO
-An array variable whose members are the line numbers in source files
-where each corresponding member of @var{FUNCNAME} was invoked.
-@code{$@{BASH_LINENO[$i]@}} is the line number in the source file
-(@code{$@{BASH_SOURCE[$i+1]@}}) where
-@code{$@{FUNCNAME[$i]@}} was called (or @code{$@{BASH_LINENO[$i-1]@}} if
-referenced within another shell function).
-Use @code{LINENO} to obtain the current line number.
-
-@item BASH_REMATCH
-An array variable whose members are assigned by the @samp{=~} binary
-operator to the @code{[[} conditional command
-(@pxref{Conditional Constructs}).
-The element with index 0 is the portion of the string
-matching the entire regular expression.
-The element with index @var{n} is the portion of the
-string matching the @var{n}th parenthesized subexpression.
-This variable is read-only.
-
-@item BASH_SOURCE
-An array variable whose members are the source filenames where the
-corresponding shell function names in the @code{FUNCNAME} array
-variable are defined.
-The shell function @code{$@{FUNCNAME[$i]@}} is defined in the file
-@code{$@{BASH_SOURCE[$i]@}} and called from @code{$@{BASH_SOURCE[$i+1]@}}
-
-@item BASH_SUBSHELL
-Incremented by one within each subshell or subshell environment when
-the shell begins executing in that environment.
-The initial value is 0.
-
-@item BASH_VERSINFO
-A readonly array variable (@pxref{Arrays})
-whose members hold version information for this instance of Bash.
-The values assigned to the array members are as follows:
-
-@table @code
-
-@item BASH_VERSINFO[0]
-The major version number (the @var{release}).
-
-@item BASH_VERSINFO[1]
-The minor version number (the @var{version}).
-
-@item BASH_VERSINFO[2]
-The patch level.
-
-@item BASH_VERSINFO[3]
-The build version.
-
-@item BASH_VERSINFO[4]
-The release status (e.g., @var{beta1}).
-
-@item BASH_VERSINFO[5]
-The value of @env{MACHTYPE}.
-@end table
-
-@item BASH_VERSION
-The version number of the current instance of Bash.
-
-@item BASH_XTRACEFD
-If set to an integer corresponding to a valid file descriptor, Bash
-will write the trace output generated when @samp{set -x}
-is enabled to that file descriptor.
-This allows tracing output to be separated from diagnostic and error
-messages.
-The file descriptor is closed when @code{BASH_XTRACEFD} is unset or assigned
-a new value.
-Unsetting @code{BASH_XTRACEFD} or assigning it the empty string causes the
-trace output to be sent to the standard error.
-Note that setting @code{BASH_XTRACEFD} to 2 (the standard error file
-descriptor) and then unsetting it will result in the standard error
-being closed.
-
-@item CHILD_MAX
-Set the number of exited child status values for the shell to remember.
-Bash will not allow this value to be decreased below a @sc{posix}-mandated
-minimum, and there is a maximum value (currently 8192) that this may
-not exceed.
-The minimum value is system-dependent.
-
-@item COLUMNS
-Used by the @code{select} command to determine the terminal width
-when printing selection lists.
-Automatically set if the @code{checkwinsize} option is enabled
-(@pxref{The Shopt Builtin}), or in an interactive shell upon receipt of a
-@code{SIGWINCH}.
-
-@item COMP_CWORD
-An index into @env{$@{COMP_WORDS@}} of the word containing the current
-cursor position.
-This variable is available only in shell functions invoked by the
-programmable completion facilities (@pxref{Programmable Completion}).
-
-@item COMP_LINE
-The current command line.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (@pxref{Programmable Completion}).
-
-@item COMP_POINT
-The index of the current cursor position relative to the beginning of
-the current command.
-If the current cursor position is at the end of the current command,
-the value of this variable is equal to @code{$@{#COMP_LINE@}}.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (@pxref{Programmable Completion}).
-
-@item COMP_TYPE
-Set to an integer value corresponding to the type of completion attempted
-that caused a completion function to be called:
-@var{TAB}, for normal completion,
-@samp{?}, for listing completions after successive tabs,
-@samp{!}, for listing alternatives on partial word completion,
-@samp{@@}, to list completions if the word is not unmodified,
-or
-@samp{%}, for menu completion.
-This variable is available only in shell functions and external
-commands invoked by the
-programmable completion facilities (@pxref{Programmable Completion}).
-
-@item COMP_KEY
-The key (or final key of a key sequence) used to invoke the current
-completion function.
-
-@item COMP_WORDBREAKS
-The set of characters that the Readline library treats as word
-separators when performing word completion.
-If @code{COMP_WORDBREAKS} is unset, it loses its special properties,
-even if it is subsequently reset.
-
-@item COMP_WORDS
-An array variable consisting of the individual
-words in the current command line.
-The line is split into words as Readline would split it, using
-@code{COMP_WORDBREAKS} as described above.
-This variable is available only in shell functions invoked by the
-programmable completion facilities (@pxref{Programmable Completion}).
-
-@item COMPREPLY
-An array variable from which Bash reads the possible completions
-generated by a shell function invoked by the programmable completion
-facility (@pxref{Programmable Completion}).
-Each array element contains one possible completion.
-
-@item COPROC
-An array variable created to hold the file descriptors
-for output from and input to an unnamed coprocess (@pxref{Coprocesses}).
-
-@item DIRSTACK
-An array variable containing the current contents of the directory stack.
-Directories appear in the stack in the order they are displayed by the
-@code{dirs} builtin.
-Assigning to members of this array variable may be used to modify
-directories already in the stack, but the @code{pushd} and @code{popd}
-builtins must be used to add and remove directories.
-Assignment to this variable will not change the current directory.
-If @env{DIRSTACK} is unset, it loses its special properties, even if
-it is subsequently reset.
-
-@item EMACS
-If Bash finds this variable in the environment when the shell
-starts with value @samp{t}, it assumes that the shell is running in an
-Emacs shell buffer and disables line editing.
-
-@item ENV
-Similar to @code{BASH_ENV}; used when the shell is invoked in
-@sc{posix} Mode (@pxref{Bash POSIX Mode}).
-
-@item EUID
-The numeric effective user id of the current user. This variable
-is readonly.
-
-@item FCEDIT
-The editor used as a default by the @option{-e} option to the @code{fc}
-builtin command.
-
-@item FIGNORE
-A colon-separated list of suffixes to ignore when performing
-filename completion.
-A filename whose suffix matches one of the entries in
-@env{FIGNORE}
-is excluded from the list of matched filenames. A sample
-value is @samp{.o:~}
-
-@item FUNCNAME
-An array variable containing the names of all shell functions
-currently in the execution call stack.
-The element with index 0 is the name of any currently-executing
-shell function.
-The bottom-most element (the one with the highest index)
-is @code{"main"}.
-This variable exists only when a shell function is executing.
-Assignments to @env{FUNCNAME} have no effect and return an error status.
-If @env{FUNCNAME} is unset, it loses its special properties, even if
-it is subsequently reset.
-
-This variable can be used with @code{BASH_LINENO} and @code{BASH_SOURCE}.
-Each element of @code{FUNCNAME} has corresponding elements in
-@code{BASH_LINENO} and @code{BASH_SOURCE} to describe the call stack.
-For instance, @code{$@{FUNCNAME[$i]@}} was called from the file
-@code{$@{BASH_SOURCE[$i+1]@}} at line number @code{$@{BASH_LINENO[$i]@}}.
-The @code{caller} builtin displays the current call stack using this
-information.
-
-@item FUNCNEST
-If set to a numeric value greater than 0, defines a maximum function
-nesting level. Function invocations that exceed this nesting level
-will cause the current command to abort.
-
-@item GLOBIGNORE
-A colon-separated list of patterns defining the set of filenames to
-be ignored by filename expansion.
-If a filename matched by a filename expansion pattern also matches one
-of the patterns in @env{GLOBIGNORE}, it is removed from the list
-of matches.
-
-@item GROUPS
-An array variable containing the list of groups of which the current
-user is a member.
-Assignments to @env{GROUPS} have no effect and return an error status.
-If @env{GROUPS} is unset, it loses its special properties, even if it is
-subsequently reset.
-
-@item histchars
-Up to three characters which control history expansion, quick
-substitution, and tokenization (@pxref{History Interaction}).
-The first character is the
-@var{history expansion} character, that is, the character which signifies the
-start of a history expansion, normally @samp{!}. The second character is the
-character which signifies `quick substitution' when seen as the first
-character on a line, normally @samp{^}. The optional third character is the
-character which indicates that the remainder of the line is a comment when
-found as the first character of a word, usually @samp{#}. The history
-comment character causes history substitution to be skipped for the
-remaining words on the line. It does not necessarily cause the shell
-parser to treat the rest of the line as a comment.
-
-@item HISTCMD
-The history number, or index in the history list, of the current
-command. If @env{HISTCMD} is unset, it loses its special properties,
-even if it is subsequently reset.
-
-@item HISTCONTROL
-A colon-separated list of values controlling how commands are saved on
-the history list.
-If the list of values includes @samp{ignorespace}, lines which begin
-with a space character are not saved in the history list.
-A value of @samp{ignoredups} causes lines which match the previous
-history entry to not be saved.
-A value of @samp{ignoreboth} is shorthand for
-@samp{ignorespace} and @samp{ignoredups}.
-A value of @samp{erasedups} causes all previous lines matching the
-current line to be removed from the history list before that line
-is saved.
-Any value not in the above list is ignored.
-If @env{HISTCONTROL} is unset, or does not include a valid value,
-all lines read by the shell parser are saved on the history list,
-subject to the value of @env{HISTIGNORE}.
-The second and subsequent lines of a multi-line compound command are
-not tested, and are added to the history regardless of the value of
-@env{HISTCONTROL}.
-
-@item HISTFILE
-The name of the file to which the command history is saved. The
-default value is @file{~/.bash_history}.
-
-@item HISTFILESIZE
-The maximum number of lines contained in the history file.
-When this variable is assigned a value, the history file is truncated,
-if necessary, to contain no more than that number of lines
-by removing the oldest entries.
-The history file is also truncated to this size after
-writing it when a shell exits.
-If the value is 0, the history file is truncated to zero size.
-Non-numeric values and numeric values less than zero inhibit truncation.
-The shell sets the default value to the value of @env{HISTSIZE}
-after reading any startup files.
-
-@item HISTIGNORE
-A colon-separated list of patterns used to decide which command
-lines should be saved on the history list. Each pattern is
-anchored at the beginning of the line and must match the complete
-line (no implicit @samp{*} is appended). Each pattern is tested
-against the line after the checks specified by @env{HISTCONTROL}
-are applied. In addition to the normal shell pattern matching
-characters, @samp{&} matches the previous history line. @samp{&}
-may be escaped using a backslash; the backslash is removed
-before attempting a match.
-The second and subsequent lines of a multi-line compound command are
-not tested, and are added to the history regardless of the value of
-@env{HISTIGNORE}.
-
-@env{HISTIGNORE} subsumes the function of @env{HISTCONTROL}. A
-pattern of @samp{&} is identical to @code{ignoredups}, and a
-pattern of @samp{[ ]*} is identical to @code{ignorespace}.
-Combining these two patterns, separating them with a colon,
-provides the functionality of @code{ignoreboth}.
-
-@item HISTSIZE
-The maximum number of commands to remember on the history list.
-If the value is 0, commands are not saved in the history list.
-Numeric values less than zero result in every command being saved
-on the history list (there is no limit).
-The shell sets the default value to 500 after reading any startup files.
-
-@item HISTTIMEFORMAT
-If this variable is set and not null, its value is used as a format string
-for @var{strftime} to print the time stamp associated with each history
-entry displayed by the @code{history} builtin.
-If this variable is set, time stamps are written to the history file so
-they may be preserved across shell sessions.
-This uses the history comment character to distinguish timestamps from
-other history lines.
-
-@item HOSTFILE
-Contains the name of a file in the same format as @file{/etc/hosts} that
-should be read when the shell needs to complete a hostname.
-The list of possible hostname completions may be changed while the shell
-is running;
-the next time hostname completion is attempted after the
-value is changed, Bash adds the contents of the new file to the
-existing list.
-If @env{HOSTFILE} is set, but has no value, or does not name a readable file,
-Bash attempts to read
-@file{/etc/hosts} to obtain the list of possible hostname completions.
-When @env{HOSTFILE} is unset, the hostname list is cleared.
-
-@item HOSTNAME
-The name of the current host.
-
-@item HOSTTYPE
-A string describing the machine Bash is running on.
-
-@item IGNOREEOF
-Controls the action of the shell on receipt of an @code{EOF} character
-as the sole input. If set, the value denotes the number
-of consecutive @code{EOF} characters that can be read as the
-first character on an input line
-before the shell will exit. If the variable exists but does not
-have a numeric value (or has no value) then the default is 10.
-If the variable does not exist, then @code{EOF} signifies the end of
-input to the shell. This is only in effect for interactive shells.
-
-@item INPUTRC
-The name of the Readline initialization file, overriding the default
-of @file{~/.inputrc}.
-
-@item LANG
-Used to determine the locale category for any category not specifically
-selected with a variable starting with @code{LC_}.
-
-@item LC_ALL
-This variable overrides the value of @env{LANG} and any other
-@code{LC_} variable specifying a locale category.
-
-@item LC_COLLATE
-This variable determines the collation order used when sorting the
-results of filename expansion, and
-determines the behavior of range expressions, equivalence classes,
-and collating sequences within filename expansion and pattern matching
-(@pxref{Filename Expansion}).
-
-@item LC_CTYPE
-This variable determines the interpretation of characters and the
-behavior of character classes within filename expansion and pattern
-matching (@pxref{Filename Expansion}).
-
-@item LC_MESSAGES
-This variable determines the locale used to translate double-quoted
-strings preceded by a @samp{$} (@pxref{Locale Translation}).
-
-@item LC_NUMERIC
-This variable determines the locale category used for number formatting.
-
-@item LINENO
-The line number in the script or shell function currently executing.
-
-@item LINES
-Used by the @code{select} command to determine the column length
-for printing selection lists.
-Automatically set if the @code{checkwinsize} option is enabled
-(@pxref{The Shopt Builtin}), or in an interactive shell upon receipt of a
-@code{SIGWINCH}.
-
-@item MACHTYPE
-A string that fully describes the system type on which Bash
-is executing, in the standard @sc{gnu} @var{cpu-company-system} format.
-
-@item MAILCHECK
-How often (in seconds) that the shell should check for mail in the
-files specified in the @env{MAILPATH} or @env{MAIL} variables.
-The default is 60 seconds. When it is time to check
-for mail, the shell does so before displaying the primary prompt.
-If this variable is unset, or set to a value that is not a number
-greater than or equal to zero, the shell disables mail checking.
-
-@item MAPFILE
-An array variable created to hold the text read by the
-@code{mapfile} builtin when no variable name is supplied.
-
-@item OLDPWD
-The previous working directory as set by the @code{cd} builtin.
-
-@item OPTERR
-If set to the value 1, Bash displays error messages
-generated by the @code{getopts} builtin command.
-
-@item OSTYPE
-A string describing the operating system Bash is running on.
-
-@item PIPESTATUS
-An array variable (@pxref{Arrays})
-containing a list of exit status values from the processes
-in the most-recently-executed foreground pipeline (which may
-contain only a single command).
-
-@item POSIXLY_CORRECT
-If this variable is in the environment when Bash starts, the shell
-enters @sc{posix} mode (@pxref{Bash POSIX Mode}) before reading the
-startup files, as if the @option{--posix} invocation option had been supplied.
-If it is set while the shell is running, Bash enables @sc{posix} mode,
-as if the command
-@example
-@code{set -o posix}
-@end example
-@noindent
-had been executed.
-
-@item PPID
-The process @sc{id} of the shell's parent process. This variable
-is readonly.
-
-@item PROMPT_COMMAND
-If set, the value is interpreted as a command to execute
-before the printing of each primary prompt (@env{$PS1}).
-
-@item PROMPT_DIRTRIM
-If set to a number greater than zero, the value is used as the number of
-trailing directory components to retain when expanding the @code{\w} and
-@code{\W} prompt string escapes (@pxref{Controlling the Prompt}).
-Characters removed are replaced with an ellipsis.
-
-@item PS3
-The value of this variable is used as the prompt for the
-@code{select} command. If this variable is not set, the
-@code{select} command prompts with @samp{#? }
-
-@item PS4
-The value is the prompt printed before the command line is echoed
-when the @option{-x} option is set (@pxref{The Set Builtin}).
-The first character of @env{PS4} is replicated multiple times, as
-necessary, to indicate multiple levels of indirection.
-The default is @samp{+ }.
-
-@item PWD
-The current working directory as set by the @code{cd} builtin.
-
-@item RANDOM
-Each time this parameter is referenced, a random integer
-between 0 and 32767 is generated. Assigning a value to this
-variable seeds the random number generator.
-
-@item READLINE_LINE
-The contents of the Readline line buffer, for use
-with @samp{bind -x} (@pxref{Bash Builtins}).
-
-@item READLINE_POINT
-The position of the insertion point in the Readline line buffer, for use
-with @samp{bind -x} (@pxref{Bash Builtins}).
-
-@item REPLY
-The default variable for the @code{read} builtin.
-
-@item SECONDS
-This variable expands to the number of seconds since the
-shell was started. Assignment to this variable resets
-the count to the value assigned, and the expanded value
-becomes the value assigned plus the number of seconds
-since the assignment.
-
-@item SHELL
-The full pathname to the shell is kept in this environment variable.
-If it is not set when the shell starts,
-Bash assigns to it the full pathname of the current user's login shell.
-
-@item SHELLOPTS
-A colon-separated list of enabled shell options. Each word in
-the list is a valid argument for the @option{-o} option to the
-@code{set} builtin command (@pxref{The Set Builtin}).
-The options appearing in @env{SHELLOPTS} are those reported
-as @samp{on} by @samp{set -o}.
-If this variable is in the environment when Bash
-starts up, each shell option in the list will be enabled before
-reading any startup files. This variable is readonly.
-
-@item SHLVL
-Incremented by one each time a new instance of Bash is started. This is
-intended to be a count of how deeply your Bash shells are nested.
-
-@item TIMEFORMAT
-The value of this parameter is used as a format string specifying
-how the timing information for pipelines prefixed with the @code{time}
-reserved word should be displayed.
-The @samp{%} character introduces an
-escape sequence that is expanded to a time value or other
-information.
-The escape sequences and their meanings are as
-follows; the braces denote optional portions.
-
-@table @code
-
-@item %%
-A literal @samp{%}.
-
-@item %[@var{p}][l]R
-The elapsed time in seconds.
-
-@item %[@var{p}][l]U
-The number of CPU seconds spent in user mode.
-
-@item %[@var{p}][l]S
-The number of CPU seconds spent in system mode.
-
-@item %P
-The CPU percentage, computed as (%U + %S) / %R.
-@end table
-
-The optional @var{p} is a digit specifying the precision, the number of
-fractional digits after a decimal point.
-A value of 0 causes no decimal point or fraction to be output.
-At most three places after the decimal point may be specified; values
-of @var{p} greater than 3 are changed to 3.
-If @var{p} is not specified, the value 3 is used.
-
-The optional @code{l} specifies a longer format, including minutes, of
-the form @var{MM}m@var{SS}.@var{FF}s.
-The value of @var{p} determines whether or not the fraction is included.
-
-If this variable is not set, Bash acts as if it had the value
-@example
-@code{$'\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS'}
-@end example
-If the value is null, no timing information is displayed.
-A trailing newline is added when the format string is displayed.
-
-@item TMOUT
-If set to a value greater than zero, @code{TMOUT} is treated as the
-default timeout for the @code{read} builtin (@pxref{Bash Builtins}).
-The @code{select} command (@pxref{Conditional Constructs}) terminates
-if input does not arrive after @code{TMOUT} seconds when input is coming
-from a terminal.
-
-In an interactive shell, the value is interpreted as
-the number of seconds to wait for a line of input after issuing
-the primary prompt.
-Bash
-terminates after waiting for that number of seconds if a complete
-line of input does not arrive.
-
-@item TMPDIR
-If set, Bash uses its value as the name of a directory in which
-Bash creates temporary files for the shell's use.
-
-@item UID
-The numeric real user id of the current user. This variable is readonly.
-
-@end vtable
-
-@node Bash Features
-@chapter Bash Features
-
-This chapter describes features unique to Bash.
-
-@menu
-* Invoking Bash:: Command line options that you can give
- to Bash.
-* Bash Startup Files:: When and how Bash executes scripts.
-* Interactive Shells:: What an interactive shell is.
-* Bash Conditional Expressions:: Primitives used in composing expressions for
- the @code{test} builtin.
-* Shell Arithmetic:: Arithmetic on shell variables.
-* Aliases:: Substituting one command for another.
-* Arrays:: Array Variables.
-* The Directory Stack:: History of visited directories.
-* Controlling the Prompt:: Customizing the various prompt strings.
-* The Restricted Shell:: A more controlled mode of shell execution.
-* Bash POSIX Mode:: Making Bash behave more closely to what
- the POSIX standard specifies.
-@end menu
-
-@node Invoking Bash
-@section Invoking Bash
-
-@example
-bash [long-opt] [-ir] [-abefhkmnptuvxdBCDHP] [-o @var{option}] [-O @var{shopt_option}] [@var{argument} @dots{}]
-bash [long-opt] [-abefhkmnptuvxdBCDHP] [-o @var{option}] [-O @var{shopt_option}] -c @var{string} [@var{argument} @dots{}]
-bash [long-opt] -s [-abefhkmnptuvxdBCDHP] [-o @var{option}] [-O @var{shopt_option}] [@var{argument} @dots{}]
-@end example
-
-All of the single-character options used with the @code{set} builtin
-(@pxref{The Set Builtin}) can be used as options when the shell is invoked.
-In addition, there are several multi-character
-options that you can use. These options must appear on the command
-line before the single-character options to be recognized.
-
-@table @code
-@item --debugger
-Arrange for the debugger profile to be executed before the shell
-starts. Turns on extended debugging mode (see @ref{The Shopt Builtin}
-for a description of the @code{extdebug} option to the @code{shopt}
-builtin).
-
-@item --dump-po-strings
-A list of all double-quoted strings preceded by @samp{$}
-is printed on the standard output
-in the @sc{gnu} @code{gettext} PO (portable object) file format.
-Equivalent to @option{-D} except for the output format.
-
-@item --dump-strings
-Equivalent to @option{-D}.
-
-@item --help
-Display a usage message on standard output and exit successfully.
-
-@item --init-file @var{filename}
-@itemx --rcfile @var{filename}
-Execute commands from @var{filename} (instead of @file{~/.bashrc})
-in an interactive shell.
-
-@item --login
-Equivalent to @option{-l}.
-
-@item --noediting
-Do not use the @sc{gnu} Readline library (@pxref{Command Line Editing})
-to read command lines when the shell is interactive.
-
-@item --noprofile
-Don't load the system-wide startup file @file{/etc/profile}
-or any of the personal initialization files
-@file{~/.bash_profile}, @file{~/.bash_login}, or @file{~/.profile}
-when Bash is invoked as a login shell.
-
-@item --norc
-Don't read the @file{~/.bashrc} initialization file in an
-interactive shell. This is on by default if the shell is
-invoked as @code{sh}.
-
-@item --posix
-Change the behavior of Bash where the default operation differs
-from the @sc{posix} standard to match the standard. This
-is intended to make Bash behave as a strict superset of that
-standard. @xref{Bash POSIX Mode}, for a description of the Bash
-@sc{posix} mode.
-
-@item --restricted
-Make the shell a restricted shell (@pxref{The Restricted Shell}).
-
-@item --verbose
-Equivalent to @option{-v}. Print shell input lines as they're read.
-
-@item --version
-Show version information for this instance of
-Bash on the standard output and exit successfully.
-@end table
-
-There are several single-character options that may be supplied at
-invocation which are not available with the @code{set} builtin.
-
-@table @code
-@item -c
-Read and execute commands from the first non-option argument
-@var{command_string}, then exit.
-If there are arguments after the @var{command_string},
-the first argument is assigned to @code{$0}
-and any remaining arguments are assigned to the positional parameters.
-The assignment to @code{$0} sets the name of the shell, which is used
-in warning and error messages.
-
-@item -i
-Force the shell to run interactively. Interactive shells are
-described in @ref{Interactive Shells}.
-
-@item -l
-Make this shell act as if it had been directly invoked by login.
-When the shell is interactive, this is equivalent to starting a
-login shell with @samp{exec -l bash}.
-When the shell is not interactive, the login shell startup files will
-be executed.
-@samp{exec bash -l} or @samp{exec bash --login}
-will replace the current shell with a Bash login shell.
-@xref{Bash Startup Files}, for a description of the special behavior
-of a login shell.
-
-@item -r
-Make the shell a restricted shell (@pxref{The Restricted Shell}).
-
-@item -s
-If this option is present, or if no arguments remain after option
-processing, then commands are read from the standard input.
-This option allows the positional parameters to be set
-when invoking an interactive shell.
-
-@item -D
-A list of all double-quoted strings preceded by @samp{$}
-is printed on the standard output.
-These are the strings that
-are subject to language translation when the current locale
-is not @code{C} or @code{POSIX} (@pxref{Locale Translation}).
-This implies the @option{-n} option; no commands will be executed.
-
-@item [-+]O [@var{shopt_option}]
-@var{shopt_option} is one of the shell options accepted by the
-@code{shopt} builtin (@pxref{The Shopt Builtin}).
-If @var{shopt_option} is present, @option{-O} sets the value of that option;
-@option{+O} unsets it.
-If @var{shopt_option} is not supplied, the names and values of the shell
-options accepted by @code{shopt} are printed on the standard output.
-If the invocation option is @option{+O}, the output is displayed in a format
-that may be reused as input.
-
-@item --
-A @code{--} signals the end of options and disables further option
-processing.
-Any arguments after the @code{--} are treated as filenames and arguments.
-@end table
-
-@cindex login shell
-A @emph{login} shell is one whose first character of argument zero is
-@samp{-}, or one invoked with the @option{--login} option.
-
-@cindex interactive shell
-An @emph{interactive} shell is one started without non-option arguments,
-unless @option{-s} is specified,
-without specifying the @option{-c} option, and whose input and output are both
-connected to terminals (as determined by @code{isatty(3)}), or one
-started with the @option{-i} option. @xref{Interactive Shells}, for more
-information.
-
-If arguments remain after option processing, and neither the
-@option{-c} nor the @option{-s}
-option has been supplied, the first argument is assumed to
-be the name of a file containing shell commands (@pxref{Shell Scripts}).
-When Bash is invoked in this fashion, @code{$0}
-is set to the name of the file, and the positional parameters
-are set to the remaining arguments.
-Bash reads and executes commands from this file, then exits.
-Bash's exit status is the exit status of the last command executed
-in the script. If no commands are executed, the exit status is 0.
-
-@node Bash Startup Files
-@section Bash Startup Files
-@cindex startup files
-
-This section describes how Bash executes its startup files.
-If any of the files exist but cannot be read, Bash reports an error.
-Tildes are expanded in filenames as described above under
-Tilde Expansion (@pxref{Tilde Expansion}).
-
-Interactive shells are described in @ref{Interactive Shells}.
-
-@subsubheading Invoked as an interactive login shell, or with @option{--login}
-
-When Bash is invoked as an interactive login shell, or as a
-non-interactive shell with the @option{--login} option, it first reads and
-executes commands from the file @file{/etc/profile}, if that file exists.
-After reading that file, it looks for @file{~/.bash_profile},
-@file{~/.bash_login}, and @file{~/.profile}, in that order, and reads
-and executes commands from the first one that exists and is readable.
-The @option{--noprofile} option may be used when the shell is started to
-inhibit this behavior.
-
-When a login shell exits, Bash reads and executes commands from
-the file @file{~/.bash_logout}, if it exists.
-
-@subsubheading Invoked as an interactive non-login shell
-
-When an interactive shell that is not a login shell is started, Bash
-reads and executes commands from @file{~/.bashrc}, if that file exists.
-This may be inhibited by using the @option{--norc} option.
-The @option{--rcfile @var{file}} option will force Bash to read and
-execute commands from @var{file} instead of @file{~/.bashrc}.
-
-So, typically, your @file{~/.bash_profile} contains the line
-@example
-@code{if [ -f ~/.bashrc ]; then . ~/.bashrc; fi}
-@end example
-@noindent
-after (or before) any login-specific initializations.
-
-@subsubheading Invoked non-interactively
-
-When Bash is started non-interactively, to run a shell script,
-for example, it looks for the variable @env{BASH_ENV} in the environment,
-expands its value if it appears there, and uses the expanded value as
-the name of a file to read and execute. Bash behaves as if the
-following command were executed:
-@example
-@code{if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi}
-@end example
-@noindent
-but the value of the @env{PATH} variable is not used to search for the
-filename.
-
-As noted above, if a non-interactive shell is invoked with the
-@option{--login} option, Bash attempts to read and execute commands from the
-login shell startup files.
-
-@subsubheading Invoked with name @code{sh}
-
-If Bash is invoked with the name @code{sh}, it tries to mimic the
-startup behavior of historical versions of @code{sh} as closely as
-possible, while conforming to the @sc{posix} standard as well.
-
-When invoked as an interactive login shell, or as a non-interactive
-shell with the @option{--login} option, it first attempts to read
-and execute commands from @file{/etc/profile} and @file{~/.profile}, in
-that order.
-The @option{--noprofile} option may be used to inhibit this behavior.
-When invoked as an interactive shell with the name @code{sh}, Bash
-looks for the variable @env{ENV}, expands its value if it is defined,
-and uses the expanded value as the name of a file to read and execute.
-Since a shell invoked as @code{sh} does not attempt to read and execute
-commands from any other startup files, the @option{--rcfile} option has
-no effect.
-A non-interactive shell invoked with the name @code{sh} does not attempt
-to read any other startup files.
-
-When invoked as @code{sh}, Bash enters @sc{posix} mode after
-the startup files are read.
-
-@subsubheading Invoked in @sc{posix} mode
-
-When Bash is started in @sc{posix} mode, as with the
-@option{--posix} command line option, it follows the @sc{posix} standard
-for startup files.
-In this mode, interactive shells expand the @env{ENV} variable
-and commands are read and executed from the file whose name is the
-expanded value.
-No other startup files are read.
-
-@subsubheading Invoked by remote shell daemon
-
-Bash attempts to determine when it is being run with its standard input
-connected to a network connection, as when executed by the remote shell
-daemon, usually @code{rshd}, or the secure shell daemon @code{sshd}.
-If Bash determines it is being run in
-this fashion, it reads and executes commands from @file{~/.bashrc}, if that
-file exists and is readable.
-It will not do this if invoked as @code{sh}.
-The @option{--norc} option may be used to inhibit this behavior, and the
-@option{--rcfile} option may be used to force another file to be read, but
-neither @code{rshd} nor @code{sshd} generally invoke the shell with those
-options or allow them to be specified.
-
-@subsubheading Invoked with unequal effective and real @sc{uid/gid}s
-
-If Bash is started with the effective user (group) id not equal to the
-real user (group) id, and the @option{-p} option is not supplied, no startup
-files are read, shell functions are not inherited from the environment,
-the @env{SHELLOPTS}, @env{BASHOPTS}, @env{CDPATH}, and @env{GLOBIGNORE}
-variables, if they appear in the environment, are ignored, and the effective
-user id is set to the real user id.
-If the @option{-p} option is supplied at invocation, the startup behavior is
-the same, but the effective user id is not reset.
-
-@node Interactive Shells
-@section Interactive Shells
-@cindex interactive shell
-@cindex shell, interactive
-
-@menu
-* What is an Interactive Shell?:: What determines whether a shell is Interactive.
-* Is this Shell Interactive?:: How to tell if a shell is interactive.
-* Interactive Shell Behavior:: What changes in a interactive shell?
-@end menu
-
-@node What is an Interactive Shell?
-@subsection What is an Interactive Shell?
-
-An interactive shell
-is one started without non-option arguments, unless @option{-s} is
-specified, without specifying the @option{-c} option, and
-whose input and error output are both
-connected to terminals (as determined by @code{isatty(3)}),
-or one started with the @option{-i} option.
-
-An interactive shell generally reads from and writes to a user's
-terminal.
-
-The @option{-s} invocation option may be used to set the positional parameters
-when an interactive shell is started.
-
-@node Is this Shell Interactive?
-@subsection Is this Shell Interactive?
-
-To determine within a startup script whether or not Bash is
-running interactively,
-test the value of the @samp{-} special parameter.
-It contains @code{i} when the shell is interactive. For example:
-
-@example
-case "$-" in
-*i*) echo This shell is interactive ;;
-*) echo This shell is not interactive ;;
-esac
-@end example
-
-Alternatively, startup scripts may examine the variable
-@env{PS1}; it is unset in non-interactive shells, and set in
-interactive shells. Thus:
-
-@example
-if [ -z "$PS1" ]; then
- echo This shell is not interactive
-else
- echo This shell is interactive
-fi
-@end example
-
-@node Interactive Shell Behavior
-@subsection Interactive Shell Behavior
-
-When the shell is running interactively, it changes its behavior in
-several ways.
-
-@enumerate
-@item
-Startup files are read and executed as described in @ref{Bash Startup Files}.
-
-@item
-Job Control (@pxref{Job Control}) is enabled by default. When job
-control is in effect, Bash ignores the keyboard-generated job control
-signals @code{SIGTTIN}, @code{SIGTTOU}, and @code{SIGTSTP}.
-
-@item
-Bash expands and displays @env{PS1} before reading the first line
-of a command, and expands and displays @env{PS2} before reading the
-second and subsequent lines of a multi-line command.
-
-@item
-Bash executes the value of the @env{PROMPT_COMMAND} variable as a command
-before printing the primary prompt, @env{$PS1}
-(@pxref{Bash Variables}).
-
-@item
-Readline (@pxref{Command Line Editing}) is used to read commands from
-the user's terminal.
-
-@item
-Bash inspects the value of the @code{ignoreeof} option to @code{set -o}
-instead of exiting immediately when it receives an @code{EOF} on its
-standard input when reading a command (@pxref{The Set Builtin}).
-
-@item
-Command history (@pxref{Bash History Facilities})
-and history expansion (@pxref{History Interaction})
-are enabled by default.
-Bash will save the command history to the file named by @env{$HISTFILE}
-when a shell with history enabled exits.
-
-@item
-Alias expansion (@pxref{Aliases}) is performed by default.
-
-@item
-In the absence of any traps, Bash ignores @code{SIGTERM}
-(@pxref{Signals}).
-
-@item
-In the absence of any traps, @code{SIGINT} is caught and handled
-((@pxref{Signals}).
-@code{SIGINT} will interrupt some shell builtins.
-
-@item
-An interactive login shell sends a @code{SIGHUP} to all jobs on exit
-if the @code{huponexit} shell option has been enabled (@pxref{Signals}).
-
-@item
-The @option{-n} invocation option is ignored, and @samp{set -n} has
-no effect (@pxref{The Set Builtin}).
-
-@item
-Bash will check for mail periodically, depending on the values of the
-@env{MAIL}, @env{MAILPATH}, and @env{MAILCHECK} shell variables
-(@pxref{Bash Variables}).
-
-@item
-Expansion errors due to references to unbound shell variables after
-@samp{set -u} has been enabled will not cause the shell to exit
-(@pxref{The Set Builtin}).
-
-@item
-The shell will not exit on expansion errors caused by @var{var} being unset
-or null in @code{$@{@var{var}:?@var{word}@}} expansions
-(@pxref{Shell Parameter Expansion}).
-
-@item
-Redirection errors encountered by shell builtins will not cause the
-shell to exit.
-
-@item
-When running in @sc{posix} mode, a special builtin returning an error
-status will not cause the shell to exit (@pxref{Bash POSIX Mode}).
-
-@item
-A failed @code{exec} will not cause the shell to exit
-(@pxref{Bourne Shell Builtins}).
-
-@item
-Parser syntax errors will not cause the shell to exit.
-
-@item
-Simple spelling correction for directory arguments to the @code{cd}
-builtin is enabled by default (see the description of the @code{cdspell}
-option to the @code{shopt} builtin in @ref{The Shopt Builtin}).
-
-@item
-The shell will check the value of the @env{TMOUT} variable and exit
-if a command is not read within the specified number of seconds after
-printing @env{$PS1} (@pxref{Bash Variables}).
-
-@end enumerate
-
-@node Bash Conditional Expressions
-@section Bash Conditional Expressions
-@cindex expressions, conditional
-
-Conditional expressions are used by the @code{[[} compound command
-and the @code{test} and @code{[} builtin commands.
-
-Expressions may be unary or binary.
-Unary expressions are often used to examine the status of a file.
-There are string operators and numeric comparison operators as well.
-If the @var{file} argument to one of the primaries is of the form
-@file{/dev/fd/@var{N}}, then file descriptor @var{N} is checked.
-If the @var{file} argument to one of the primaries is one of
-@file{/dev/stdin}, @file{/dev/stdout}, or @file{/dev/stderr}, file
-descriptor 0, 1, or 2, respectively, is checked.
-
-When used with @code{[[}, the @samp{<} and @samp{>} operators sort
-lexicographically using the current locale.
-The @code{test} command uses ASCII ordering.
-
-Unless otherwise specified, primaries that operate on files follow symbolic
-links and operate on the target of the link, rather than the link itself.
-
-@table @code
-@item -a @var{file}
-True if @var{file} exists.
-
-@item -b @var{file}
-True if @var{file} exists and is a block special file.
-
-@item -c @var{file}
-True if @var{file} exists and is a character special file.
-
-@item -d @var{file}
-True if @var{file} exists and is a directory.
-
-@item -e @var{file}
-True if @var{file} exists.
-
-@item -f @var{file}
-True if @var{file} exists and is a regular file.
-
-@item -g @var{file}
-True if @var{file} exists and its set-group-id bit is set.
-
-@item -h @var{file}
-True if @var{file} exists and is a symbolic link.
-
-@item -k @var{file}
-True if @var{file} exists and its "sticky" bit is set.
-
-@item -p @var{file}
-True if @var{file} exists and is a named pipe (FIFO).
-
-@item -r @var{file}
-True if @var{file} exists and is readable.
-
-@item -s @var{file}
-True if @var{file} exists and has a size greater than zero.
-
-@item -t @var{fd}
-True if file descriptor @var{fd} is open and refers to a terminal.
-
-@item -u @var{file}
-True if @var{file} exists and its set-user-id bit is set.
-
-@item -w @var{file}
-True if @var{file} exists and is writable.
-
-@item -x @var{file}
-True if @var{file} exists and is executable.
-
-@item -G @var{file}
-True if @var{file} exists and is owned by the effective group id.
-
-@item -L @var{file}
-True if @var{file} exists and is a symbolic link.
-
-@item -N @var{file}
-True if @var{file} exists and has been modified since it was last read.
-
-@item -O @var{file}
-True if @var{file} exists and is owned by the effective user id.
-
-@item -S @var{file}
-True if @var{file} exists and is a socket.
-
-@item @var{file1} -ef @var{file2}
-True if @var{file1} and @var{file2} refer to the same device and
-inode numbers.
-
-@item @var{file1} -nt @var{file2}
-True if @var{file1} is newer (according to modification date)
-than @var{file2}, or if @var{file1} exists and @var{file2} does not.
-
-@item @var{file1} -ot @var{file2}
-True if @var{file1} is older than @var{file2},
-or if @var{file2} exists and @var{file1} does not.
-
-@item -o @var{optname}
-True if the shell option @var{optname} is enabled.
-The list of options appears in the description of the @option{-o}
-option to the @code{set} builtin (@pxref{The Set Builtin}).
-
-@item -v @var{varname}
-True if the shell variable @var{varname} is set (has been assigned a value).
-
-@item -R @var{varname}
-True if the shell variable @var{varname} is set and is a name reference.
-
-@item -z @var{string}
-True if the length of @var{string} is zero.
-
-@item -n @var{string}
-@itemx @var{string}
-True if the length of @var{string} is non-zero.
-
-@item @var{string1} == @var{string2}
-@itemx @var{string1} = @var{string2}
-True if the strings are equal.
-When used with the @code{[[} command, this performs pattern matching as
-described above (@pxref{Conditional Constructs}).
-
-@samp{=} should be used with the @code{test} command for @sc{posix} conformance.
-
-@item @var{string1} != @var{string2}
-True if the strings are not equal.
-
-@item @var{string1} < @var{string2}
-True if @var{string1} sorts before @var{string2} lexicographically.
-
-@item @var{string1} > @var{string2}
-True if @var{string1} sorts after @var{string2} lexicographically.
-
-@item @var{arg1} OP @var{arg2}
-@code{OP} is one of
-@samp{-eq}, @samp{-ne}, @samp{-lt}, @samp{-le}, @samp{-gt}, or @samp{-ge}.
-These arithmetic binary operators return true if @var{arg1}
-is equal to, not equal to, less than, less than or equal to,
-greater than, or greater than or equal to @var{arg2},
-respectively. @var{Arg1} and @var{arg2}
-may be positive or negative integers.
-@end table
-
-@node Shell Arithmetic
-@section Shell Arithmetic
-@cindex arithmetic, shell
-@cindex shell arithmetic
-@cindex expressions, arithmetic
-@cindex evaluation, arithmetic
-@cindex arithmetic evaluation
-
-The shell allows arithmetic expressions to be evaluated, as one of
-the shell expansions or by the @code{let} and the @option{-i} option
-to the @code{declare} builtins.
-
-Evaluation is done in fixed-width integers with no check for overflow,
-though division by 0 is trapped and flagged as an error.
-The operators and their precedence, associativity, and values
-are the same as in the C language.
-The following list of operators is grouped into levels of
-equal-precedence operators.
-The levels are listed in order of decreasing precedence.
-
-@table @code
-
-@item @var{id}++ @var{id}--
-variable post-increment and post-decrement
-
-@item ++@var{id} --@var{id}
-variable pre-increment and pre-decrement
-
-@item - +
-unary minus and plus
-
-@item ! ~
-logical and bitwise negation
-
-@item **
-exponentiation
-
-@item * / %
-multiplication, division, remainder
-
-@item + -
-addition, subtraction
-
-@item << >>
-left and right bitwise shifts
-
-@item <= >= < >
-comparison
-
-@item == !=
-equality and inequality
-
-@item &
-bitwise AND
-
-@item ^
-bitwise exclusive OR
-
-@item |
-bitwise OR
-
-@item &&
-logical AND
-
-@item ||
-logical OR
-
-@item expr ? expr : expr
-conditional operator
-
-@item = *= /= %= += -= <<= >>= &= ^= |=
-assignment
-
-@item expr1 , expr2
-comma
-@end table
-
-Shell variables are allowed as operands; parameter expansion is
-performed before the expression is evaluated.
-Within an expression, shell variables may also be referenced by name
-without using the parameter expansion syntax.
-A shell variable that is null or unset evaluates to 0 when referenced
-by name without using the parameter expansion syntax.
-The value of a variable is evaluated as an arithmetic expression
-when it is referenced, or when a variable which has been given the
-@var{integer} attribute using @samp{declare -i} is assigned a value.
-A null value evaluates to 0.
-A shell variable need not have its @var{integer} attribute turned on
-to be used in an expression.
-
-Constants with a leading 0 are interpreted as octal numbers.
-A leading @samp{0x} or @samp{0X} denotes hexadecimal. Otherwise,
-numbers take the form [@var{base}@code{#}]@var{n}, where the optional @var{base}
-is a decimal number between 2 and 64 representing the arithmetic
-base, and @var{n} is a number in that base.
-If @var{base}@code{#} is omitted, then base 10 is used.
-When specifying @var{n},
-he digits greater than 9 are represented by the lowercase letters,
-the uppercase letters, @samp{@@}, and @samp{_}, in that order.
-If @var{base} is less than or equal to 36, lowercase and uppercase
-letters may be used interchangeably to represent numbers between 10
-and 35.
-
-Operators are evaluated in order of precedence. Sub-expressions in
-parentheses are evaluated first and may override the precedence
-rules above.
-
-@node Aliases
-@section Aliases
-@cindex alias expansion
-
-@var{Aliases} allow a string to be substituted for a word when it is used
-as the first word of a simple command.
-The shell maintains a list of aliases that may be set and unset with
-the @code{alias} and @code{unalias} builtin commands.
-
-The first word of each simple command, if unquoted, is checked to see
-if it has an alias.
-If so, that word is replaced by the text of the alias.
-The characters @samp{/}, @samp{$}, @samp{`}, @samp{=} and any of the
-shell metacharacters or quoting characters listed above may not appear
-in an alias name.
-The replacement text may contain any valid
-shell input, including shell metacharacters.
-The first word of the replacement text is tested for
-aliases, but a word that is identical to an alias being expanded
-is not expanded a second time.
-This means that one may alias @code{ls} to @code{"ls -F"},
-for instance, and Bash does not try to recursively expand the
-replacement text.
-If the last character of the alias value is a
-@var{blank}, then the next command word following the
-alias is also checked for alias expansion.
-
-Aliases are created and listed with the @code{alias}
-command, and removed with the @code{unalias} command.
-
-There is no mechanism for using arguments in the replacement text,
-as in @code{csh}.
-If arguments are needed, a shell function should be used
-(@pxref{Shell Functions}).
-
-Aliases are not expanded when the shell is not interactive,
-unless the @code{expand_aliases} shell option is set using
-@code{shopt} (@pxref{The Shopt Builtin}).
-
-The rules concerning the definition and use of aliases are
-somewhat confusing. Bash
-always reads at least one complete line
-of input before executing any
-of the commands on that line. Aliases are expanded when a
-command is read, not when it is executed. Therefore, an
-alias definition appearing on the same line as another
-command does not take effect until the next line of input is read.
-The commands following the alias definition
-on that line are not affected by the new alias.
-This behavior is also an issue when functions are executed.
-Aliases are expanded when a function definition is read,
-not when the function is executed, because a function definition
-is itself a command. As a consequence, aliases
-defined in a function are not available until after that
-function is executed. To be safe, always put
-alias definitions on a separate line, and do not use @code{alias}
-in compound commands.
-
-For almost every purpose, shell functions are preferred over aliases.
-
-@node Arrays
-@section Arrays
-@cindex arrays
-
-Bash provides one-dimensional indexed and associative array variables.
-Any variable may be used as an indexed array;
-the @code{declare} builtin will explicitly declare an array.
-There is no maximum
-limit on the size of an array, nor any requirement that members
-be indexed or assigned contiguously.
-Indexed arrays are referenced using integers (including arithmetic
-expressions (@pxref{Shell Arithmetic})) and are zero-based;
-associative arrays use arbitrary strings.
-Unless otherwise noted, indexed array indices must be non-negative integers.
-
-An indexed array is created automatically if any variable is assigned to
-using the syntax
-@example
-@var{name}[@var{subscript}]=@var{value}
-@end example
-
-@noindent
-The @var{subscript}
-is treated as an arithmetic expression that must evaluate to a number.
-To explicitly declare an array, use
-@example
-declare -a @var{name}
-@end example
-@noindent
-The syntax
-@example
-declare -a @var{name}[@var{subscript}]
-@end example
-@noindent
-is also accepted; the @var{subscript} is ignored.
-
-@noindent
-Associative arrays are created using
-@example
-declare -A @var{name}.
-@end example
-
-Attributes may be
-specified for an array variable using the @code{declare} and
-@code{readonly} builtins. Each attribute applies to all members of
-an array.
-
-Arrays are assigned to using compound assignments of the form
-@example
-@var{name}=(@var{value1} @var{value2} @dots{} )
-@end example
-@noindent
-where each
-@var{value} is of the form @code{[@var{subscript}]=}@var{string}.
-Indexed array assignments do not require anything but @var{string}.
-When assigning to indexed arrays, if
-the optional subscript is supplied, that index is assigned to;
-otherwise the index of the element assigned is the last index assigned
-to by the statement plus one. Indexing starts at zero.
-
-When assigning to an associative array, the subscript is required.
-
-This syntax is also accepted by the @code{declare}
-builtin. Individual array elements may be assigned to using the
-@code{@var{name}[@var{subscript}]=@var{value}} syntax introduced above.
-
-When assigning to an indexed array, if @var{name}
-is subscripted by a negative number, that number is
-interpreted as relative to one greater than the maximum index of
-@var{name}, so negative indices count back from the end of the
-array, and an index of -1 references the last element.
-
-Any element of an array may be referenced using
-@code{$@{@var{name}[@var{subscript}]@}}.
-The braces are required to avoid
-conflicts with the shell's filename expansion operators. If the
-@var{subscript} is @samp{@@} or @samp{*}, the word expands to all members
-of the array @var{name}. These subscripts differ only when the word
-appears within double quotes.
-If the word is double-quoted,
-@code{$@{@var{name}[*]@}} expands to a single word with
-the value of each array member separated by the first character of the
-@env{IFS} variable, and @code{$@{@var{name}[@@]@}} expands each element of
-@var{name} to a separate word. When there are no array members,
-@code{$@{@var{name}[@@]@}} expands to nothing.
-If the double-quoted expansion occurs within a word, the expansion of
-the first parameter is joined with the beginning part of the original
-word, and the expansion of the last parameter is joined with the last
-part of the original word.
-This is analogous to the
-expansion of the special parameters @samp{@@} and @samp{*}.
-@code{$@{#@var{name}[@var{subscript}]@}} expands to the length of
-@code{$@{@var{name}[@var{subscript}]@}}.
-If @var{subscript} is @samp{@@} or
-@samp{*}, the expansion is the number of elements in the array.
-Referencing an array variable without a subscript is equivalent to
-referencing with a subscript of 0.
-If the @var{subscript}
-used to reference an element of an indexed array
-evaluates to a number less than zero, it is
-interpreted as relative to one greater than the maximum index of the array,
-so negative indices count back from the end of the array,
-and an index of -1 refers to the last element.
-
-An array variable is considered set if a subscript has been assigned a
-value. The null string is a valid value.
-
-It is possible to obtain the keys (indices) of an array as well as the values.
-$@{!@var{name}[@@]@} and $@{!@var{name}[*]@} expand to the indices
-assigned in array variable @var{name}.
-The treatment when in double quotes is similar to the expansion of the
-special parameters @samp{@@} and @samp{*} within double quotes.
-
-The @code{unset} builtin is used to destroy arrays.
-@code{unset @var{name}[@var{subscript}]}
-destroys the array element at index @var{subscript}.
-Negative subscripts to indexed arrays are interpreted as described above.
-Care must be taken to avoid unwanted side effects caused by filename
-expansion.
-@code{unset @var{name}}, where @var{name} is an array, removes the
-entire array. A subscript of @samp{*} or @samp{@@} also removes the
-entire array.
-
-The @code{declare}, @code{local}, and @code{readonly}
-builtins each accept a @option{-a} option to specify an indexed
-array and a @option{-A} option to specify an associative array.
-If both options are supplied, @option{-A} takes precedence.
-The @code{read} builtin accepts a @option{-a}
-option to assign a list of words read from the standard input
-to an array, and can read values from the standard input into
-individual array elements. The @code{set} and @code{declare}
-builtins display array values in a way that allows them to be
-reused as input.
-
-@node The Directory Stack
-@section The Directory Stack
-@cindex directory stack
-
-@menu
-* Directory Stack Builtins:: Bash builtin commands to manipulate
- the directory stack.
-@end menu
-
-The directory stack is a list of recently-visited directories. The
-@code{pushd} builtin adds directories to the stack as it changes
-the current directory, and the @code{popd} builtin removes specified
-directories from the stack and changes the current directory to
-the directory removed. The @code{dirs} builtin displays the contents
-of the directory stack.
-
-The contents of the directory stack are also visible
-as the value of the @env{DIRSTACK} shell variable.
-
-@node Directory Stack Builtins
-@subsection Directory Stack Builtins
-
-@table @code
-
-@item dirs
-@btindex dirs
-@example
-dirs [-clpv] [+@var{N} | -@var{N}]
-@end example
-
-Display the list of currently remembered directories. Directories
-are added to the list with the @code{pushd} command; the
-@code{popd} command removes directories from the list.
-
-@table @code
-@item -c
-Clears the directory stack by deleting all of the elements.
-@item -l
-Produces a listing using full pathnames;
-the default listing format uses a tilde to denote the home directory.
-@item -p
-Causes @code{dirs} to print the directory stack with one entry per
-line.
-@item -v
-Causes @code{dirs} to print the directory stack with one entry per
-line, prefixing each entry with its index in the stack.
-@item +@var{N}
-Displays the @var{N}th directory (counting from the left of the
-list printed by @code{dirs} when invoked without options), starting
-with zero.
-@item -@var{N}
-Displays the @var{N}th directory (counting from the right of the
-list printed by @code{dirs} when invoked without options), starting
-with zero.
-@end table
-
-@item popd
-@btindex popd
-@example
-popd [-n] [+@var{N} | -@var{N}]
-@end example
-
-Remove the top entry from the directory stack, and @code{cd}
-to the new top directory.
-When no arguments are given, @code{popd}
-removes the top directory from the stack and
-performs a @code{cd} to the new top directory. The
-elements are numbered from 0 starting at the first directory listed with
-@code{dirs}; that is, @code{popd} is equivalent to @code{popd +0}.
-
-@table @code
-@item -n
-Suppresses the normal change of directory when removing directories
-from the stack, so that only the stack is manipulated.
-@item +@var{N}
-Removes the @var{N}th directory (counting from the left of the
-list printed by @code{dirs}), starting with zero.
-@item -@var{N}
-Removes the @var{N}th directory (counting from the right of the
-list printed by @code{dirs}), starting with zero.
-@end table
-
-@btindex pushd
-@item pushd
-@example
-pushd [-n] [@var{+N} | @var{-N} | @var{dir}]
-@end example
-
-Save the current directory on the top of the directory stack
-and then @code{cd} to @var{dir}.
-With no arguments, @code{pushd} exchanges the top two directories.
-
-@table @code
-@item -n
-Suppresses the normal change of directory when adding directories
-to the stack, so that only the stack is manipulated.
-@item +@var{N}
-Brings the @var{N}th directory (counting from the left of the
-list printed by @code{dirs}, starting with zero) to the top of
-the list by rotating the stack.
-@item -@var{N}
-Brings the @var{N}th directory (counting from the right of the
-list printed by @code{dirs}, starting with zero) to the top of
-the list by rotating the stack.
-@item @var{dir}
-Makes the current working directory be the top of the stack, making
-it the new current directory as if it had been supplied as an argument
-to the @code{cd} builtin.
-@end table
-@end table
-
-@node Controlling the Prompt
-@section Controlling the Prompt
-@cindex prompting
-
-The value of the variable @env{PROMPT_COMMAND} is examined just before
-Bash prints each primary prompt. If @env{PROMPT_COMMAND} is set and
-has a non-null value, then the
-value is executed just as if it had been typed on the command line.
-
-In addition, the following table describes the special characters which
-can appear in the prompt variables @env{PS1} to @env{PS4}:
-
-@table @code
-@item \a
-A bell character.
-@item \d
-The date, in "Weekday Month Date" format (e.g., "Tue May 26").
-@item \D@{@var{format}@}
-The @var{format} is passed to @code{strftime}(3) and the result is inserted
-into the prompt string; an empty @var{format} results in a locale-specific
-time representation. The braces are required.
-@item \e
-An escape character.
-@item \h
-The hostname, up to the first `.'.
-@item \H
-The hostname.
-@item \j
-The number of jobs currently managed by the shell.
-@item \l
-The basename of the shell's terminal device name.
-@item \n
-A newline.
-@item \r
-A carriage return.
-@item \s
-The name of the shell, the basename of @code{$0} (the portion
-following the final slash).
-@item \t
-The time, in 24-hour HH:MM:SS format.
-@item \T
-The time, in 12-hour HH:MM:SS format.
-@item \@@
-The time, in 12-hour am/pm format.
-@item \A
-The time, in 24-hour HH:MM format.
-@item \u
-The username of the current user.
-@item \v
-The version of Bash (e.g., 2.00)
-@item \V
-The release of Bash, version + patchlevel (e.g., 2.00.0)
-@item \w
-The current working directory, with @env{$HOME} abbreviated with a tilde
-(uses the @env{$PROMPT_DIRTRIM} variable).
-@item \W
-The basename of @env{$PWD}, with @env{$HOME} abbreviated with a tilde.
-@item \!
-The history number of this command.
-@item \#
-The command number of this command.
-@item \$
-If the effective uid is 0, @code{#}, otherwise @code{$}.
-@item \@var{nnn}
-The character whose ASCII code is the octal value @var{nnn}.
-@item \\
-A backslash.
-@item \[
-Begin a sequence of non-printing characters. This could be used to
-embed a terminal control sequence into the prompt.
-@item \]
-End a sequence of non-printing characters.
-@end table
-
-The command number and the history number are usually different:
-the history number of a command is its position in the history
-list, which may include commands restored from the history file
-(@pxref{Bash History Facilities}), while the command number is
-the position in the sequence of commands executed during the current
-shell session.
-
-After the string is decoded, it is expanded via
-parameter expansion, command substitution, arithmetic
-expansion, and quote removal, subject to the value of the
-@code{promptvars} shell option (@pxref{Bash Builtins}).
-
-@node The Restricted Shell
-@section The Restricted Shell
-@cindex restricted shell
-
-If Bash is started with the name @code{rbash}, or the
-@option{--restricted}
-or
-@option{-r}
-option is supplied at invocation, the shell becomes restricted.
-A restricted shell is used to
-set up an environment more controlled than the standard shell.
-A restricted shell behaves identically to @code{bash}
-with the exception that the following are disallowed or not performed:
-
-@itemize @bullet
-@item
-Changing directories with the @code{cd} builtin.
-@item
-Setting or unsetting the values of the @env{SHELL}, @env{PATH},
-@env{ENV}, or @env{BASH_ENV} variables.
-@item
-Specifying command names containing slashes.
-@item
-Specifying a filename containing a slash as an argument to the @code{.}
-builtin command.
-@item
-Specifying a filename containing a slash as an argument to the @option{-p}
-option to the @code{hash} builtin command.
-@item
-Importing function definitions from the shell environment at startup.
-@item
-Parsing the value of @env{SHELLOPTS} from the shell environment at startup.
-@item
-Redirecting output using the @samp{>}, @samp{>|}, @samp{<>}, @samp{>&},
-@samp{&>}, and @samp{>>} redirection operators.
-@item
-Using the @code{exec} builtin to replace the shell with another command.
-@item
-Adding or deleting builtin commands with the
-@option{-f} and @option{-d} options to the @code{enable} builtin.
-@item
-Using the @code{enable} builtin command to enable disabled shell builtins.
-@item
-Specifying the @option{-p} option to the @code{command} builtin.
-@item
-Turning off restricted mode with @samp{set +r} or @samp{set +o restricted}.
-@end itemize
-
-These restrictions are enforced after any startup files are read.
-
-When a command that is found to be a shell script is executed
-(@pxref{Shell Scripts}), @code{rbash} turns off any restrictions in
-the shell spawned to execute the script.
-
-@node Bash POSIX Mode
-@section Bash POSIX Mode
-@cindex POSIX Mode
-
-Starting Bash with the @option{--posix} command-line option or executing
-@samp{set -o posix} while Bash is running will cause Bash to conform more
-closely to the @sc{posix} standard by changing the behavior to
-match that specified by @sc{posix} in areas where the Bash default differs.
-
-When invoked as @code{sh}, Bash enters @sc{posix} mode after reading the
-startup files.
-
-The following list is what's changed when `@sc{posix} mode' is in effect:
-
-@enumerate
-@item
-When a command in the hash table no longer exists, Bash will re-search
-@env{$PATH} to find the new location. This is also available with
-@samp{shopt -s checkhash}.
-
-@item
-The message printed by the job control code and builtins when a job
-exits with a non-zero status is `Done(status)'.
-
-@item
-The message printed by the job control code and builtins when a job
-is stopped is `Stopped(@var{signame})', where @var{signame} is, for
-example, @code{SIGTSTP}.
-
-@item
-The @code{bg} builtin uses the required format to describe each job placed
-in the background, which does not include an indication of whether the job
-is the current or previous job.
-
-@item
-Reserved words appearing in a context where reserved words are recognized
-do not undergo alias expansion.
-
-@item
-The @sc{posix} @env{PS1} and @env{PS2} expansions of @samp{!} to
-the history number and @samp{!!} to @samp{!} are enabled,
-and parameter expansion is performed on the values of @env{PS1} and
-@env{PS2} regardless of the setting of the @code{promptvars} option.
-
-@item
-The @sc{posix} startup files are executed (@env{$ENV}) rather than
-the normal Bash files.
-
-@item
-Tilde expansion is only performed on assignments preceding a command
-name, rather than on all assignment statements on the line.
-
-@item
-The @code{command} builtin does not prevent builtins that take assignment
-statements as arguments from expanding them as assignment statements;
-when not in @sc{posix} mode, assignment builtins lose their assignment
-statement expansion properties when preceded by @code{command}.
-
-@item
-The default history file is @file{~/.sh_history} (this is the
-default value of @env{$HISTFILE}).
-
-@item
-The output of @samp{kill -l} prints all the signal names on a single line,
-separated by spaces, without the @samp{SIG} prefix.
-
-@item
-The @code{kill} builtin does not accept signal names with a @samp{SIG}
-prefix.
-
-@item
-Non-interactive shells exit if @var{filename} in @code{.} @var{filename}
-is not found.
-
-@item
-Non-interactive shells exit if a syntax error in an arithmetic expansion
-results in an invalid expression.
-
-@item
-Non-interactive shells exit if there is a syntax error in a script read
-with the @code{.} or @code{source} builtins, or in a string processed by
-the @code{eval} builtin.
-
-@item
-Redirection operators do not perform filename expansion on the word
-in the redirection unless the shell is interactive.
-
-@item
-Redirection operators do not perform word splitting on the word in the
-redirection.
-
-@item
-Function names must be valid shell @code{name}s. That is, they may not
-contain characters other than letters, digits, and underscores, and
-may not start with a digit. Declaring a function with an invalid name
-causes a fatal syntax error in non-interactive shells.
-
-@item
-Function names may not be the same as one of the @sc{posix} special
-builtins.
-
-@item
-@sc{posix} special builtins are found before shell functions
-during command lookup.
-
-@item
-The @code{time} reserved word may be used by itself as a command. When
-used in this way, it displays timing statistics for the shell and its
-completed children. The @env{TIMEFORMAT} variable controls the format
-of the timing information.
-
-@item
-When parsing and expanding a $@{@dots{}@} expansion that appears within
-double quotes, single quotes are no longer special and cannot be used to
-quote a closing brace or other special character, unless the operator is
-one of those defined to perform pattern removal. In this case, they do
-not have to appear as matched pairs.
-
-@item
-The parser does not recognize @code{time} as a reserved word if the next
-token begins with a @samp{-}.
-
-@item
-If a @sc{posix} special builtin returns an error status, a
-non-interactive shell exits. The fatal errors are those listed in
-the @sc{posix} standard, and include things like passing incorrect options,
-redirection errors, variable assignment errors for assignments preceding
-the command name, and so on.
-
-@item
-A non-interactive shell exits with an error status if a variable
-assignment error occurs when no command name follows the assignment
-statements.
-A variable assignment error occurs, for example, when trying to assign
-a value to a readonly variable.
-
-@item
-A non-interactive shell exits with an error status if a variable
-assignment error occurs in an assignment statement preceding a special
-builtin, but not with any other simple command.
-
-@item
-A non-interactive shell exits with an error status if the iteration
-variable in a @code{for} statement or the selection variable in a
-@code{select} statement is a readonly variable.
-
-@item
-Process substitution is not available.
-
-@item
-While variable indirection is available, it may not be applied to the
-@samp{#} and @samp{?} special parameters.
-
-@item
-Assignment statements preceding @sc{posix} special builtins
-persist in the shell environment after the builtin completes.
-
-@item
-Assignment statements preceding shell function calls persist in the
-shell environment after the function returns, as if a @sc{posix}
-special builtin command had been executed.
-
-@item
-The @code{export} and @code{readonly} builtin commands display their
-output in the format required by @sc{posix}.
-
-@item
-The @code{trap} builtin displays signal names without the leading
-@code{SIG}.
-
-@item
-The @code{trap} builtin doesn't check the first argument for a possible
-signal specification and revert the signal handling to the original
-disposition if it is, unless that argument consists solely of digits and
-is a valid signal number. If users want to reset the handler for a given
-signal to the original disposition, they should use @samp{-} as the
-first argument.
-
-@item
-The @code{.} and @code{source} builtins do not search the current directory
-for the filename argument if it is not found by searching @env{PATH}.
-
-@item
-Subshells spawned to execute command substitutions inherit the value of
-the @option{-e} option from the parent shell. When not in @sc{posix} mode,
-Bash clears the @option{-e} option in such subshells.
-
-@item
-Alias expansion is always enabled, even in non-interactive shells.
-
-@item
-When the @code{alias} builtin displays alias definitions, it does not
-display them with a leading @samp{alias } unless the @option{-p} option
-is supplied.
-
-@item
-When the @code{set} builtin is invoked without options, it does not display
-shell function names and definitions.
-
-@item
-When the @code{set} builtin is invoked without options, it displays
-variable values without quotes, unless they contain shell metacharacters,
-even if the result contains nonprinting characters.
-
-@item
-When the @code{cd} builtin is invoked in @var{logical} mode, and the pathname
-constructed from @code{$PWD} and the directory name supplied as an argument
-does not refer to an existing directory, @code{cd} will fail instead of
-falling back to @var{physical} mode.
-
-@item
-The @code{pwd} builtin verifies that the value it prints is the same as the
-current directory, even if it is not asked to check the file system with the
-@option{-P} option.
-
-@item
-When listing the history, the @code{fc} builtin does not include an
-indication of whether or not a history entry has been modified.
-
-@item
-The default editor used by @code{fc} is @code{ed}.
-
-@item
-The @code{type} and @code{command} builtins will not report a non-executable
-file as having been found, though the shell will attempt to execute such a
-file if it is the only so-named file found in @code{$PATH}.
-
-@item
-The @code{vi} editing mode will invoke the @code{vi} editor directly when
-the @samp{v} command is run, instead of checking @code{$VISUAL} and
-@code{$EDITOR}.
-
-@item
-When the @code{xpg_echo} option is enabled, Bash does not attempt to interpret
-any arguments to @code{echo} as options. Each argument is displayed, after
-escape characters are converted.
-
-@item
-The @code{ulimit} builtin uses a block size of 512 bytes for the @option{-c}
-and @option{-f} options.
-
-@item
-The arrival of @code{SIGCHLD} when a trap is set on @code{SIGCHLD} does
-not interrupt the @code{wait} builtin and cause it to return immediately.
-The trap command is run once for each child that exits.
-
-@item
-The @code{read} builtin may be interrupted by a signal for which a trap
-has been set.
-If Bash receives a trapped signal while executing @code{read}, the trap
-handler executes and @code{read} returns an exit status greater than 128.
-
-@end enumerate
-
-There is other @sc{posix} behavior that Bash does not implement by
-default even when in @sc{posix} mode.
-Specifically:
-
-@enumerate
-
-@item
-The @code{fc} builtin checks @code{$EDITOR} as a program to edit history
-entries if @code{FCEDIT} is unset, rather than defaulting directly to
-@code{ed}. @code{fc} uses @code{ed} if @code{EDITOR} is unset.
-
-@item
-As noted above, Bash requires the @code{xpg_echo} option to be enabled for
-the @code{echo} builtin to be fully conformant.
-
-@end enumerate
-
-Bash can be configured to be @sc{posix}-conformant by default, by specifying
-the @option{--enable-strict-posix-default} to @code{configure} when building
-(@pxref{Optional Features}).
-
-@node Job Control
-@chapter Job Control
-
-This chapter discusses what job control is, how it works, and how
-Bash allows you to access its facilities.
-
-@menu
-* Job Control Basics:: How job control works.
-* Job Control Builtins:: Bash builtin commands used to interact
- with job control.
-* Job Control Variables:: Variables Bash uses to customize job
- control.
-@end menu
-
-@node Job Control Basics
-@section Job Control Basics
-@cindex job control
-@cindex foreground
-@cindex background
-@cindex suspending jobs
-
-Job control
-refers to the ability to selectively stop (suspend)
-the execution of processes and continue (resume)
-their execution at a later point. A user typically employs
-this facility via an interactive interface supplied jointly
-by the operating system kernel's terminal driver and Bash.
-
-The shell associates a @var{job} with each pipeline. It keeps a
-table of currently executing jobs, which may be listed with the
-@code{jobs} command. When Bash starts a job
-asynchronously, it prints a line that looks
-like:
-@example
-[1] 25647
-@end example
-@noindent
-indicating that this job is job number 1 and that the process @sc{id}
-of the last process in the pipeline associated with this job is
-25647. All of the processes in a single pipeline are members of
-the same job. Bash uses the @var{job} abstraction as the
-basis for job control.
-
-To facilitate the implementation of the user interface to job
-control, the operating system maintains the notion of a current terminal
-process group @sc{id}. Members of this process group (processes whose
-process group @sc{id} is equal to the current terminal process group
-@sc{id}) receive keyboard-generated signals such as @code{SIGINT}.
-These processes are said to be in the foreground. Background
-processes are those whose process group @sc{id} differs from the
-terminal's; such processes are immune to keyboard-generated
-signals. Only foreground processes are allowed to read from or, if
-the user so specifies with @code{stty tostop}, write to the terminal.
-Background processes which attempt to
-read from (write to when @code{stty tostop} is in effect) the
-terminal are sent a @code{SIGTTIN} (@code{SIGTTOU})
-signal by the kernel's terminal driver,
-which, unless caught, suspends the process.
-
-If the operating system on which Bash is running supports
-job control, Bash contains facilities to use it. Typing the
-@var{suspend} character (typically @samp{^Z}, Control-Z) while a
-process is running causes that process to be stopped and returns
-control to Bash. Typing the @var{delayed suspend} character
-(typically @samp{^Y}, Control-Y) causes the process to be stopped
-when it attempts to read input from the terminal, and control to
-be returned to Bash. The user then manipulates the state of
-this job, using the @code{bg} command to continue it in the
-background, the @code{fg} command to continue it in the
-foreground, or the @code{kill} command to kill it. A @samp{^Z}
-takes effect immediately, and has the additional side effect of
-causing pending output and typeahead to be discarded.
-
-There are a number of ways to refer to a job in the shell. The
-character @samp{%} introduces a job specification (@var{jobspec}).
-
-Job number @code{n} may be referred to as @samp{%n}.
-The symbols @samp{%%} and @samp{%+} refer to the shell's notion of the
-current job, which is the last job stopped while it was in the foreground
-or started in the background.
-A single @samp{%} (with no accompanying job specification) also refers
-to the current job.
-The previous job may be referenced using @samp{%-}.
-If there is only a single job, @samp{%+} and @samp{%-} can both be used
-to refer to that job.
-In output pertaining to jobs (e.g., the output of the @code{jobs}
-command), the current job is always flagged with a @samp{+}, and the
-previous job with a @samp{-}.
-
-A job may also be referred to
-using a prefix of the name used to start it, or using a substring
-that appears in its command line. For example, @samp{%ce} refers
-to a stopped @code{ce} job. Using @samp{%?ce}, on the
-other hand, refers to any job containing the string @samp{ce} in
-its command line. If the prefix or substring matches more than one job,
-Bash reports an error.
-
-Simply naming a job can be used to bring it into the foreground:
-@samp{%1} is a synonym for @samp{fg %1}, bringing job 1 from the
-background into the foreground. Similarly, @samp{%1 &} resumes
-job 1 in the background, equivalent to @samp{bg %1}
-
-The shell learns immediately whenever a job changes state.
-Normally, Bash waits until it is about to print a prompt
-before reporting changes in a job's status so as to not interrupt
-any other output.
-If the @option{-b} option to the @code{set} builtin is enabled,
-Bash reports such changes immediately (@pxref{The Set Builtin}).
-Any trap on @code{SIGCHLD} is executed for each child process
-that exits.
-
-If an attempt to exit Bash is made while jobs are stopped, (or running, if
-the @code{checkjobs} option is enabled -- see @ref{The Shopt Builtin}), the
-shell prints a warning message, and if the @code{checkjobs} option is
-enabled, lists the jobs and their statuses.
-The @code{jobs} command may then be used to inspect their status.
-If a second attempt to exit is made without an intervening command,
-Bash does not print another warning, and any stopped jobs are terminated.
-
-@node Job Control Builtins
-@section Job Control Builtins
-
-@table @code
-
-@item bg
-@btindex bg
-@example
-bg [@var{jobspec} @dots{}]
-@end example
-
-Resume each suspended job @var{jobspec} in the background, as if it
-had been started with @samp{&}.
-If @var{jobspec} is not supplied, the current job is used.
-The return status is zero unless it is run when job control is not
-enabled, or, when run with job control enabled, any
-@var{jobspec} was not found or specifies a job
-that was started without job control.
-
-@item fg
-@btindex fg
-@example
-fg [@var{jobspec}]
-@end example
-
-Resume the job @var{jobspec} in the foreground and make it the current job.
-If @var{jobspec} is not supplied, the current job is used.
-The return status is that of the command placed into the foreground,
-or non-zero if run when job control is disabled or, when run with
-job control enabled, @var{jobspec} does not specify a valid job or
-@var{jobspec} specifies a job that was started without job control.
-
-@item jobs
-@btindex jobs
-@example
-jobs [-lnprs] [@var{jobspec}]
-jobs -x @var{command} [@var{arguments}]
-@end example
-
-The first form lists the active jobs. The options have the
-following meanings:
-
-@table @code
-@item -l
-List process @sc{id}s in addition to the normal information.
-
-@item -n
-Display information only about jobs that have changed status since
-the user was last notified of their status.
-
-@item -p
-List only the process @sc{id} of the job's process group leader.
-
-@item -r
-Display only running jobs.
-
-@item -s
-Display only stopped jobs.
-@end table
-
-If @var{jobspec} is given,
-output is restricted to information about that job.
-If @var{jobspec} is not supplied, the status of all jobs is
-listed.
-
-If the @option{-x} option is supplied, @code{jobs} replaces any
-@var{jobspec} found in @var{command} or @var{arguments} with the
-corresponding process group @sc{id}, and executes @var{command},
-passing it @var{argument}s, returning its exit status.
-
-@item kill
-@btindex kill
-@example
-kill [-s @var{sigspec}] [-n @var{signum}] [-@var{sigspec}] @var{jobspec} or @var{pid}
-kill -l [@var{exit_status}]
-@end example
-
-Send a signal specified by @var{sigspec} or @var{signum} to the process
-named by job specification @var{jobspec} or process @sc{id} @var{pid}.
-@var{sigspec} is either a case-insensitive signal name such as
-@code{SIGINT} (with or without the @code{SIG} prefix)
-or a signal number; @var{signum} is a signal number.
-If @var{sigspec} and @var{signum} are not present, @code{SIGTERM} is used.
-The @option{-l} option lists the signal names.
-If any arguments are supplied when @option{-l} is given, the names of the
-signals corresponding to the arguments are listed, and the return status
-is zero.
-@var{exit_status} is a number specifying a signal number or the exit
-status of a process terminated by a signal.
-The return status is zero if at least one signal was successfully sent,
-or non-zero if an error occurs or an invalid option is encountered.
-
-@item wait
-@btindex wait
-@example
-wait [-n] [@var{jobspec} or @var{pid} @dots{}]
-@end example
-
-Wait until the child process specified by each process @sc{id} @var{pid}
-or job specification @var{jobspec} exits and return the exit status of the
-last command waited for.
-If a job spec is given, all processes in the job are waited for.
-If no arguments are given, all currently active child processes are
-waited for, and the return status is zero.
-If the @option{-n} option is supplied, @code{wait} waits for any job to
-terminate and returns its exit status.
-If neither @var{jobspec} nor @var{pid} specifies an active child process
-of the shell, the return status is 127.
-
-@item disown
-@btindex disown
-@example
-disown [-ar] [-h] [@var{jobspec} @dots{}]
-@end example
-
-Without options, remove each @var{jobspec} from the table of
-active jobs.
-If the @option{-h} option is given, the job is not removed from the table,
-but is marked so that @code{SIGHUP} is not sent to the job if the shell
-receives a @code{SIGHUP}.
-If @var{jobspec} is not present, and neither the @option{-a} nor the
-@option{-r} option is supplied, the current job is used.
-If no @var{jobspec} is supplied, the @option{-a} option means to remove or
-mark all jobs; the @option{-r} option without a @var{jobspec}
-argument restricts operation to running jobs.
-
-@item suspend
-@btindex suspend
-@example
-suspend [-f]
-@end example
-
-Suspend the execution of this shell until it receives a
-@code{SIGCONT} signal.
-A login shell cannot be suspended; the @option{-f}
-option can be used to override this and force the suspension.
-@end table
-
-When job control is not active, the @code{kill} and @code{wait}
-builtins do not accept @var{jobspec} arguments. They must be
-supplied process @sc{id}s.
-
-@node Job Control Variables
-@section Job Control Variables
-
-@vtable @code
-
-@item auto_resume
-This variable controls how the shell interacts with the user and
-job control. If this variable exists then single word simple
-commands without redirections are treated as candidates for resumption
-of an existing job. There is no ambiguity allowed; if there is
-more than one job beginning with the string typed, then
-the most recently accessed job will be selected.
-The name of a stopped job, in this context, is the command line
-used to start it. If this variable is set to the value @samp{exact},
-the string supplied must match the name of a stopped job exactly;
-if set to @samp{substring},
-the string supplied needs to match a substring of the name of a
-stopped job. The @samp{substring} value provides functionality
-analogous to the @samp{%?} job @sc{id} (@pxref{Job Control Basics}).
-If set to any other value, the supplied string must
-be a prefix of a stopped job's name; this provides functionality
-analogous to the @samp{%} job @sc{id}.
-
-@end vtable
-
-@set readline-appendix
-@set history-appendix
-@cindex Readline, how to use
-@include rluser.texi
-@cindex History, how to use
-@include hsuser.texi
-@clear readline-appendix
-@clear history-appendix
-
-@node Installing Bash
-@chapter Installing Bash
-
-This chapter provides basic instructions for installing Bash on
-the various supported platforms. The distribution supports the
-@sc{gnu} operating systems, nearly every version of Unix, and several
-non-Unix systems such as BeOS and Interix.
-Other independent ports exist for
-@sc{ms-dos}, @sc{os/2}, and Windows platforms.
-
-@menu
-* Basic Installation:: Installation instructions.
-* Compilers and Options:: How to set special options for various
- systems.
-* Compiling For Multiple Architectures:: How to compile Bash for more
- than one kind of system from
- the same source tree.
-* Installation Names:: How to set the various paths used by the installation.
-* Specifying the System Type:: How to configure Bash for a particular system.
-* Sharing Defaults:: How to share default configuration values among GNU
- programs.
-* Operation Controls:: Options recognized by the configuration program.
-* Optional Features:: How to enable and disable optional features when
- building Bash.
-@end menu
-
-@node Basic Installation
-@section Basic Installation
-@cindex installation
-@cindex configuration
-@cindex Bash installation
-@cindex Bash configuration
-
-These are installation instructions for Bash.
-
-The simplest way to compile Bash is:
-
-@enumerate
-@item
-@code{cd} to the directory containing the source code and type
-@samp{./configure} to configure Bash for your system. If you're
-using @code{csh} on an old version of System V, you might need to
-type @samp{sh ./configure} instead to prevent @code{csh} from trying
-to execute @code{configure} itself.
-
-Running @code{configure} takes some time.
-While running, it prints messages telling which features it is
-checking for.
-
-@item
-Type @samp{make} to compile Bash and build the @code{bashbug} bug
-reporting script.
-
-@item
-Optionally, type @samp{make tests} to run the Bash test suite.
-
-@item
-Type @samp{make install} to install @code{bash} and @code{bashbug}.
-This will also install the manual pages and Info file.
-
-@end enumerate
-
-The @code{configure} shell script attempts to guess correct
-values for various system-dependent variables used during
-compilation. It uses those values to create a @file{Makefile} in
-each directory of the package (the top directory, the
-@file{builtins}, @file{doc}, and @file{support} directories,
-each directory under @file{lib}, and several others). It also creates a
-@file{config.h} file containing system-dependent definitions.
-Finally, it creates a shell script named @code{config.status} that you
-can run in the future to recreate the current configuration, a
-file @file{config.cache} that saves the results of its tests to
-speed up reconfiguring, and a file @file{config.log} containing
-compiler output (useful mainly for debugging @code{configure}).
-If at some point
-@file{config.cache} contains results you don't want to keep, you
-may remove or edit it.
-
-To find out more about the options and arguments that the
-@code{configure} script understands, type
-
-@example
-bash-2.04$ ./configure --help
-@end example
-
-@noindent
-at the Bash prompt in your Bash source directory.
-
-If you need to do unusual things to compile Bash, please
-try to figure out how @code{configure} could check whether or not
-to do them, and mail diffs or instructions to
-@email{bash-maintainers@@gnu.org} so they can be
-considered for the next release.
-
-The file @file{configure.ac} is used to create @code{configure}
-by a program called Autoconf. You only need
-@file{configure.ac} if you want to change it or regenerate
-@code{configure} using a newer version of Autoconf. If
-you do this, make sure you are using Autoconf version 2.50 or
-newer.
-
-You can remove the program binaries and object files from the
-source code directory by typing @samp{make clean}. To also remove the
-files that @code{configure} created (so you can compile Bash for
-a different kind of computer), type @samp{make distclean}.
-
-@node Compilers and Options
-@section Compilers and Options
-
-Some systems require unusual options for compilation or linking
-that the @code{configure} script does not know about. You can
-give @code{configure} initial values for variables by setting
-them in the environment. Using a Bourne-compatible shell, you
-can do that on the command line like this:
-
-@example
-CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure
-@end example
-
-On systems that have the @code{env} program, you can do it like this:
-
-@example
-env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure
-@end example
-
-The configuration process uses GCC to build Bash if it
-is available.
-
-@node Compiling For Multiple Architectures
-@section Compiling For Multiple Architectures
-
-You can compile Bash for more than one kind of computer at the
-same time, by placing the object files for each architecture in their
-own directory. To do this, you must use a version of @code{make} that
-supports the @code{VPATH} variable, such as GNU @code{make}.
-@code{cd} to the
-directory where you want the object files and executables to go and run
-the @code{configure} script from the source directory. You may need to
-supply the @option{--srcdir=PATH} argument to tell @code{configure} where the
-source files are. @code{configure} automatically checks for the
-source code in the directory that @code{configure} is in and in `..'.
-
-If you have to use a @code{make} that does not supports the @code{VPATH}
-variable, you can compile Bash for one architecture at a
-time in the source code directory. After you have installed
-Bash for one architecture, use @samp{make distclean} before
-reconfiguring for another architecture.
-
-Alternatively, if your system supports symbolic links, you can use the
-@file{support/mkclone} script to create a build tree which has
-symbolic links back to each file in the source directory. Here's an
-example that creates a build directory in the current directory from a
-source directory @file{/usr/gnu/src/bash-2.0}:
-
-@example
-bash /usr/gnu/src/bash-2.0/support/mkclone -s /usr/gnu/src/bash-2.0 .
-@end example
-
-@noindent
-The @code{mkclone} script requires Bash, so you must have already built
-Bash for at least one architecture before you can create build
-directories for other architectures.
-
-@node Installation Names
-@section Installation Names
-
-By default, @samp{make install} will install into
-@file{/usr/local/bin}, @file{/usr/local/man}, etc. You can
-specify an installation prefix other than @file{/usr/local} by
-giving @code{configure} the option @option{--prefix=@var{PATH}},
-or by specifying a value for the @code{DESTDIR} @samp{make}
-variable when running @samp{make install}.
-
-You can specify separate installation prefixes for
-architecture-specific files and architecture-independent files.
-If you give @code{configure} the option
-@option{--exec-prefix=@var{PATH}}, @samp{make install} will use
-@var{PATH} as the prefix for installing programs and libraries.
-Documentation and other data files will still use the regular prefix.
-
-@node Specifying the System Type
-@section Specifying the System Type
-
-There may be some features @code{configure} can not figure out
-automatically, but need to determine by the type of host Bash
-will run on. Usually @code{configure} can figure that
-out, but if it prints a message saying it can not guess the host
-type, give it the @option{--host=TYPE} option. @samp{TYPE} can
-either be a short name for the system type, such as @samp{sun4},
-or a canonical name with three fields: @samp{CPU-COMPANY-SYSTEM}
-(e.g., @samp{i386-unknown-freebsd4.2}).
-
-See the file @file{support/config.sub} for the possible
-values of each field.
-
-@node Sharing Defaults
-@section Sharing Defaults
-
-If you want to set default values for @code{configure} scripts to
-share, you can create a site shell script called
-@code{config.site} that gives default values for variables like
-@code{CC}, @code{cache_file}, and @code{prefix}. @code{configure}
-looks for @file{PREFIX/share/config.site} if it exists, then
-@file{PREFIX/etc/config.site} if it exists. Or, you can set the
-@code{CONFIG_SITE} environment variable to the location of the site
-script. A warning: the Bash @code{configure} looks for a site script,
-but not all @code{configure} scripts do.
-
-@node Operation Controls
-@section Operation Controls
-
-@code{configure} recognizes the following options to control how it
-operates.
-
-@table @code
-
-@item --cache-file=@var{file}
-Use and save the results of the tests in
-@var{file} instead of @file{./config.cache}. Set @var{file} to
-@file{/dev/null} to disable caching, for debugging
-@code{configure}.
-
-@item --help
-Print a summary of the options to @code{configure}, and exit.
-
-@item --quiet
-@itemx --silent
-@itemx -q
-Do not print messages saying which checks are being made.
-
-@item --srcdir=@var{dir}
-Look for the Bash source code in directory @var{dir}. Usually
-@code{configure} can determine that directory automatically.
-
-@item --version
-Print the version of Autoconf used to generate the @code{configure}
-script, and exit.
-@end table
-
-@code{configure} also accepts some other, not widely used, boilerplate
-options. @samp{configure --help} prints the complete list.
-
-@node Optional Features
-@section Optional Features
-
-The Bash @code{configure} has a number of @option{--enable-@var{feature}}
-options, where @var{feature} indicates an optional part of Bash.
-There are also several @option{--with-@var{package}} options,
-where @var{package} is something like @samp{bash-malloc} or @samp{purify}.
-To turn off the default use of a package, use
-@option{--without-@var{package}}. To configure Bash without a feature
-that is enabled by default, use @option{--disable-@var{feature}}.
-
-Here is a complete list of the @option{--enable-} and
-@option{--with-} options that the Bash @code{configure} recognizes.
-
-@table @code
-@item --with-afs
-Define if you are using the Andrew File System from Transarc.
-
-@item --with-bash-malloc
-Use the Bash version of
-@code{malloc} in the directory @file{lib/malloc}. This is not the same
-@code{malloc} that appears in @sc{gnu} libc, but an older version
-originally derived from the 4.2 @sc{bsd} @code{malloc}. This @code{malloc}
-is very fast, but wastes some space on each allocation.
-This option is enabled by default.
-The @file{NOTES} file contains a list of systems for
-which this should be turned off, and @code{configure} disables this
-option automatically for a number of systems.
-
-@item --with-curses
-Use the curses library instead of the termcap library. This should
-be supplied if your system has an inadequate or incomplete termcap
-database.
-
-@item --with-gnu-malloc
-A synonym for @code{--with-bash-malloc}.
-
-@item --with-installed-readline[=@var{PREFIX}]
-Define this to make Bash link with a locally-installed version of Readline
-rather than the version in @file{lib/readline}. This works only with
-Readline 5.0 and later versions. If @var{PREFIX} is @code{yes} or not
-supplied, @code{configure} uses the values of the make variables
-@code{includedir} and @code{libdir}, which are subdirectories of @code{prefix}
-by default, to find the installed version of Readline if it is not in
-the standard system include and library directories.
-If @var{PREFIX} is @code{no}, Bash links with the version in
-@file{lib/readline}.
-If @var{PREFIX} is set to any other value, @code{configure} treats it as
-a directory pathname and looks for
-the installed version of Readline in subdirectories of that directory
-(include files in @var{PREFIX}/@code{include} and the library in
-@var{PREFIX}/@code{lib}).
-
-@item --with-purify
-Define this to use the Purify memory allocation checker from Rational
-Software.
-
-@item --enable-minimal-config
-This produces a shell with minimal features, close to the historical
-Bourne shell.
-@end table
-
-There are several @option{--enable-} options that alter how Bash is
-compiled and linked, rather than changing run-time features.
-
-@table @code
-@item --enable-largefile
-Enable support for @uref{http://www.sas.com/standards/large_file/x_open.20Mar96.html,
-large files} if the operating system requires special compiler options
-to build programs which can access large files. This is enabled by
-default, if the operating system provides large file support.
-
-@item --enable-profiling
-This builds a Bash binary that produces profiling information to be
-processed by @code{gprof} each time it is executed.
-
-@item --enable-static-link
-This causes Bash to be linked statically, if @code{gcc} is being used.
-This could be used to build a version to use as root's shell.
-@end table
-
-The @samp{minimal-config} option can be used to disable all of
-the following options, but it is processed first, so individual
-options may be enabled using @samp{enable-@var{feature}}.
-
-All of the following options except for @samp{disabled-builtins},
-@samp{direxpand-default}, and
-@samp{xpg-echo-default} are
-enabled by default, unless the operating system does not provide the
-necessary support.
-
-@table @code
-@item --enable-alias
-Allow alias expansion and include the @code{alias} and @code{unalias}
-builtins (@pxref{Aliases}).
-
-@item --enable-arith-for-command
-Include support for the alternate form of the @code{for} command
-that behaves like the C language @code{for} statement
-(@pxref{Looping Constructs}).
-
-@item --enable-array-variables
-Include support for one-dimensional array shell variables
-(@pxref{Arrays}).
-
-@item --enable-bang-history
-Include support for @code{csh}-like history substitution
-(@pxref{History Interaction}).
-
-@item --enable-brace-expansion
-Include @code{csh}-like brace expansion
-( @code{b@{a,b@}c} @expansion{} @code{bac bbc} ).
-See @ref{Brace Expansion}, for a complete description.
-
-@item --enable-casemod-attributes
-Include support for case-modifying attributes in the @code{declare} builtin
-and assignment statements. Variables with the @var{uppercase} attribute,
-for example, will have their values converted to uppercase upon assignment.
-
-@item --enable-casemod-expansion
-Include support for case-modifying word expansions.
-
-@item --enable-command-timing
-Include support for recognizing @code{time} as a reserved word and for
-displaying timing statistics for the pipeline following @code{time}
-(@pxref{Pipelines}).
-This allows pipelines as well as shell builtins and functions to be timed.
-
-@item --enable-cond-command
-Include support for the @code{[[} conditional command.
-(@pxref{Conditional Constructs}).
-
-@item --enable-cond-regexp
-Include support for matching @sc{posix} regular expressions using the
-@samp{=~} binary operator in the @code{[[} conditional command.
-(@pxref{Conditional Constructs}).
-
-@item --enable-coprocesses
-Include support for coprocesses and the @code{coproc} reserved word
-(@pxref{Pipelines}).
-
-@item --enable-debugger
-Include support for the bash debugger (distributed separately).
-
-@item --enable-direxpand-default
-Cause the @code{direxpand} shell option (@pxref{The Shopt Builtin})
-to be enabled by default when the shell starts.
-It is normally disabled by default.
-
-@item --enable-directory-stack
-Include support for a @code{csh}-like directory stack and the
-@code{pushd}, @code{popd}, and @code{dirs} builtins
-(@pxref{The Directory Stack}).
-
-@item --enable-disabled-builtins
-Allow builtin commands to be invoked via @samp{builtin xxx}
-even after @code{xxx} has been disabled using @samp{enable -n xxx}.
-See @ref{Bash Builtins}, for details of the @code{builtin} and
-@code{enable} builtin commands.
-
-@item --enable-dparen-arithmetic
-Include support for the @code{((@dots{}))} command
-(@pxref{Conditional Constructs}).
-
-@item --enable-extended-glob
-Include support for the extended pattern matching features described
-above under @ref{Pattern Matching}.
-
-@item --enable-extended-glob-default
-Set the default value of the @var{extglob} shell option described
-above under @ref{The Shopt Builtin} to be enabled.
-
-@item --enable-glob-asciirange-default
-Set the default value of the @var{globasciiranges} shell option described
-above under @ref{The Shopt Builtin} to be enabled.
-This controls the behavior of character ranges when used in pattern matching
-bracket expressions.
-
-@item --enable-help-builtin
-Include the @code{help} builtin, which displays help on shell builtins and
-variables (@pxref{Bash Builtins}).
-
-@item --enable-history
-Include command history and the @code{fc} and @code{history}
-builtin commands (@pxref{Bash History Facilities}).
-
-@item --enable-job-control
-This enables the job control features (@pxref{Job Control}),
-if the operating system supports them.
-
-@item --enable-multibyte
-This enables support for multibyte characters if the operating
-system provides the necessary support.
-
-@item --enable-net-redirections
-This enables the special handling of filenames of the form
-@code{/dev/tcp/@var{host}/@var{port}} and
-@code{/dev/udp/@var{host}/@var{port}}
-when used in redirections (@pxref{Redirections}).
-
-@item --enable-process-substitution
-This enables process substitution (@pxref{Process Substitution}) if
-the operating system provides the necessary support.
-
-@item --enable-progcomp
-Enable the programmable completion facilities
-(@pxref{Programmable Completion}).
-If Readline is not enabled, this option has no effect.
-
-@item --enable-prompt-string-decoding
-Turn on the interpretation of a number of backslash-escaped characters
-in the @env{$PS1}, @env{$PS2}, @env{$PS3}, and @env{$PS4} prompt
-strings. See @ref{Controlling the Prompt}, for a complete list of prompt
-string escape sequences.
-
-@item --enable-readline
-Include support for command-line editing and history with the Bash
-version of the Readline library (@pxref{Command Line Editing}).
-
-@item --enable-restricted
-Include support for a @dfn{restricted shell}. If this is enabled, Bash,
-when called as @code{rbash}, enters a restricted mode. See
-@ref{The Restricted Shell}, for a description of restricted mode.
-
-@item --enable-select
-Include the @code{select} compound command, which allows the generation of
-simple menus (@pxref{Conditional Constructs}).
-
-@item --enable-separate-helpfiles
-Use external files for the documentation displayed by the @code{help} builtin
-instead of storing the text internally.
-
-@item --enable-single-help-strings
-Store the text displayed by the @code{help} builtin as a single string for
-each help topic. This aids in translating the text to different languages.
-You may need to disable this if your compiler cannot handle very long string
-literals.
-
-@item --enable-strict-posix-default
-Make Bash @sc{posix}-conformant by default (@pxref{Bash POSIX Mode}).
-
-@item --enable-usg-echo-default
-A synonym for @code{--enable-xpg-echo-default}.
-
-@item --enable-xpg-echo-default
-Make the @code{echo} builtin expand backslash-escaped characters by default,
-without requiring the @option{-e} option.
-This sets the default value of the @code{xpg_echo} shell option to @code{on},
-which makes the Bash @code{echo} behave more like the version specified in
-the Single Unix Specification, version 3.
-@xref{Bash Builtins}, for a description of the escape sequences that
-@code{echo} recognizes.
-@end table
-
-The file @file{config-top.h} contains C Preprocessor
-@samp{#define} statements for options which are not settable from
-@code{configure}.
-Some of these are not meant to be changed; beware of the consequences if
-you do.
-Read the comments associated with each definition for more
-information about its effect.
-
-@node Reporting Bugs
-@appendix Reporting Bugs
-
-Please report all bugs you find in Bash.
-But first, you should
-make sure that it really is a bug, and that it appears in the latest
-version of Bash.
-The latest version of Bash is always available for FTP from
-@uref{ftp://ftp.gnu.org/pub/gnu/bash/}.
-
-Once you have determined that a bug actually exists, use the
-@code{bashbug} command to submit a bug report.
-If you have a fix, you are encouraged to mail that as well!
-Suggestions and `philosophical' bug reports may be mailed
-to @email{bug-bash@@gnu.org} or posted to the Usenet
-newsgroup @code{gnu.bash.bug}.
-
-All bug reports should include:
-@itemize @bullet
-@item
-The version number of Bash.
-@item
-The hardware and operating system.
-@item
-The compiler used to compile Bash.
-@item
-A description of the bug behaviour.
-@item
-A short script or `recipe' which exercises the bug and may be used
-to reproduce it.
-@end itemize
-
-@noindent
-@code{bashbug} inserts the first three items automatically into
-the template it provides for filing a bug report.
-
-Please send all reports concerning this manual to
-@email{bug-bash@@gnu.org}.
-
-@node Major Differences From The Bourne Shell
-@appendix Major Differences From The Bourne Shell
-
-Bash implements essentially the same grammar, parameter and
-variable expansion, redirection, and quoting as the Bourne Shell.
-Bash uses the @sc{posix} standard as the specification of
-how these features are to be implemented. There are some
-differences between the traditional Bourne shell and Bash; this
-section quickly details the differences of significance. A
-number of these differences are explained in greater depth in
-previous sections.
-This section uses the version of @code{sh} included in SVR4.2 (the
-last version of the historical Bourne shell) as the baseline reference.
-
-@itemize @bullet
-
-@item
-Bash is @sc{posix}-conformant, even where the @sc{posix} specification
-differs from traditional @code{sh} behavior (@pxref{Bash POSIX Mode}).
-
-@item
-Bash has multi-character invocation options (@pxref{Invoking Bash}).
-
-@item
-Bash has command-line editing (@pxref{Command Line Editing}) and
-the @code{bind} builtin.
-
-@item
-Bash provides a programmable word completion mechanism
-(@pxref{Programmable Completion}), and builtin commands
-@code{complete}, @code{compgen}, and @code{compopt}, to
-manipulate it.
-
-@item
-Bash has command history (@pxref{Bash History Facilities}) and the
-@code{history} and @code{fc} builtins to manipulate it.
-The Bash history list maintains timestamp information and uses the
-value of the @code{HISTTIMEFORMAT} variable to display it.
-
-@item
-Bash implements @code{csh}-like history expansion
-(@pxref{History Interaction}).
-
-@item
-Bash has one-dimensional array variables (@pxref{Arrays}), and the
-appropriate variable expansions and assignment syntax to use them.
-Several of the Bash builtins take options to act on arrays.
-Bash provides a number of built-in array variables.
-
-@item
-The @code{$'@dots{}'} quoting syntax, which expands ANSI-C
-backslash-escaped characters in the text between the single quotes,
-is supported (@pxref{ANSI-C Quoting}).
-
-@item
-Bash supports the @code{$"@dots{}"} quoting syntax to do
-locale-specific translation of the characters between the double
-quotes. The @option{-D}, @option{--dump-strings}, and @option{--dump-po-strings}
-invocation options list the translatable strings found in a script
-(@pxref{Locale Translation}).
-
-@item
-Bash implements the @code{!} keyword to negate the return value of
-a pipeline (@pxref{Pipelines}).
-Very useful when an @code{if} statement needs to act only if a test fails.
-The Bash @samp{-o pipefail} option to @code{set} will cause a pipeline to
-return a failure status if any command fails.
-
-@item
-Bash has the @code{time} reserved word and command timing (@pxref{Pipelines}).
-The display of the timing statistics may be controlled with the
-@env{TIMEFORMAT} variable.
-
-@item
-Bash implements the @code{for (( @var{expr1} ; @var{expr2} ; @var{expr3} ))}
-arithmetic for command, similar to the C language (@pxref{Looping Constructs}).
-
-@item
-Bash includes the @code{select} compound command, which allows the
-generation of simple menus (@pxref{Conditional Constructs}).
-
-@item
-Bash includes the @code{[[} compound command, which makes conditional
-testing part of the shell grammar (@pxref{Conditional Constructs}), including
-optional regular expression matching.
-
-@item
-Bash provides optional case-insensitive matching for the @code{case} and
-@code{[[} constructs.
-
-@item
-Bash includes brace expansion (@pxref{Brace Expansion}) and tilde
-expansion (@pxref{Tilde Expansion}).
-
-@item
-Bash implements command aliases and the @code{alias} and @code{unalias}
-builtins (@pxref{Aliases}).
-
-@item
-Bash provides shell arithmetic, the @code{((} compound command
-(@pxref{Conditional Constructs}),
-and arithmetic expansion (@pxref{Shell Arithmetic}).
-
-@item
-Variables present in the shell's initial environment are automatically
-exported to child processes. The Bourne shell does not normally do
-this unless the variables are explicitly marked using the @code{export}
-command.
-
-@item
-Bash supports the @samp{+=} assignment operator, which appends to the value
-of the variable named on the left hand side.
-
-@item
-Bash includes the @sc{posix} pattern removal @samp{%}, @samp{#}, @samp{%%}
-and @samp{##} expansions to remove leading or trailing substrings from
-variable values (@pxref{Shell Parameter Expansion}).
-
-@item
-The expansion @code{$@{#xx@}}, which returns the length of @code{$@{xx@}},
-is supported (@pxref{Shell Parameter Expansion}).
-
-@item
-The expansion @code{$@{var:}@var{offset}@code{[:}@var{length}@code{]@}},
-which expands to the substring of @code{var}'s value of length
-@var{length}, beginning at @var{offset}, is present
-(@pxref{Shell Parameter Expansion}).
-
-@item
-The expansion
-@code{$@{var/[/]}@var{pattern}@code{[/}@var{replacement}@code{]@}},
-which matches @var{pattern} and replaces it with @var{replacement} in
-the value of @code{var}, is available (@pxref{Shell Parameter Expansion}).
-
-@item
-The expansion @code{$@{!@var{prefix}*@}} expansion, which expands to
-the names of all shell variables whose names begin with @var{prefix},
-is available (@pxref{Shell Parameter Expansion}).
-
-@item
-Bash has @var{indirect} variable expansion using @code{$@{!word@}}
-(@pxref{Shell Parameter Expansion}).
-
-@item
-Bash can expand positional parameters beyond @code{$9} using
-@code{$@{@var{num}@}}.
-
-@item
-The @sc{posix} @code{$()} form of command substitution
-is implemented (@pxref{Command Substitution}),
-and preferred to the Bourne shell's @code{``} (which
-is also implemented for backwards compatibility).
-
-@item
-Bash has process substitution (@pxref{Process Substitution}).
-
-@item
-Bash automatically assigns variables that provide information about the
-current user (@env{UID}, @env{EUID}, and @env{GROUPS}), the current host
-(@env{HOSTTYPE}, @env{OSTYPE}, @env{MACHTYPE}, and @env{HOSTNAME}),
-and the instance of Bash that is running (@env{BASH},
-@env{BASH_VERSION}, and @env{BASH_VERSINFO}). @xref{Bash Variables},
-for details.
-
-@item
-The @env{IFS} variable is used to split only the results of expansion,
-not all words (@pxref{Word Splitting}).
-This closes a longstanding shell security hole.
-
-@item
-The filename expansion bracket expression code uses @samp{!} and @samp{^}
-to negate the set of characters between the brackets.
-The Bourne shell uses only @samp{!}.
-
-@item
-Bash implements the full set of @sc{posix} filename expansion operators,
-including @var{character classes}, @var{equivalence classes}, and
-@var{collating symbols} (@pxref{Filename Expansion}).
-
-@item
-Bash implements extended pattern matching features when the @code{extglob}
-shell option is enabled (@pxref{Pattern Matching}).
-
-@item
-It is possible to have a variable and a function with the same name;
-@code{sh} does not separate the two name spaces.
-
-@item
-Bash functions are permitted to have local variables using the
-@code{local} builtin, and thus useful recursive functions may be written
-(@pxref{Bash Builtins}).
-
-@item
-Variable assignments preceding commands affect only that command, even
-builtins and functions (@pxref{Environment}).
-In @code{sh}, all variable assignments
-preceding commands are global unless the command is executed from the
-file system.
-
-@item
-Bash performs filename expansion on filenames specified as operands
-to input and output redirection operators (@pxref{Redirections}).
-
-@item
-Bash contains the @samp{<>} redirection operator, allowing a file to be
-opened for both reading and writing, and the @samp{&>} redirection
-operator, for directing standard output and standard error to the same
-file (@pxref{Redirections}).
-
-@item
-Bash includes the @samp{<<<} redirection operator, allowing a string to
-be used as the standard input to a command.
-
-@item
-Bash implements the @samp{[n]<&@var{word}} and @samp{[n]>&@var{word}}
-redirection operators, which move one file descriptor to another.
-
-@item
-Bash treats a number of filenames specially when they are
-used in redirection operators (@pxref{Redirections}).
-
-@item
-Bash can open network connections to arbitrary machines and services
-with the redirection operators (@pxref{Redirections}).
-
-@item
-The @code{noclobber} option is available to avoid overwriting existing
-files with output redirection (@pxref{The Set Builtin}).
-The @samp{>|} redirection operator may be used to override @code{noclobber}.
-
-@item
-The Bash @code{cd} and @code{pwd} builtins (@pxref{Bourne Shell Builtins})
-each take @option{-L} and @option{-P} options to switch between logical and
-physical modes.
-
-@item
-Bash allows a function to override a builtin with the same name, and provides
-access to that builtin's functionality within the function via the
-@code{builtin} and @code{command} builtins (@pxref{Bash Builtins}).
-
-@item
-The @code{command} builtin allows selective disabling of functions
-when command lookup is performed (@pxref{Bash Builtins}).
-
-@item
-Individual builtins may be enabled or disabled using the @code{enable}
-builtin (@pxref{Bash Builtins}).
-
-@item
-The Bash @code{exec} builtin takes additional options that allow users
-to control the contents of the environment passed to the executed
-command, and what the zeroth argument to the command is to be
-(@pxref{Bourne Shell Builtins}).
-
-@item
-Shell functions may be exported to children via the environment
-using @code{export -f} (@pxref{Shell Functions}).
-
-@item
-The Bash @code{export}, @code{readonly}, and @code{declare} builtins can
-take a @option{-f} option to act on shell functions, a @option{-p} option to
-display variables with various attributes set in a format that can be
-used as shell input, a @option{-n} option to remove various variable
-attributes, and @samp{name=value} arguments to set variable attributes
-and values simultaneously.
-
-@item
-The Bash @code{hash} builtin allows a name to be associated with
-an arbitrary filename, even when that filename cannot be found by
-searching the @env{$PATH}, using @samp{hash -p}
-(@pxref{Bourne Shell Builtins}).
-
-@item
-Bash includes a @code{help} builtin for quick reference to shell
-facilities (@pxref{Bash Builtins}).
-
-@item
-The @code{printf} builtin is available to display formatted output
-(@pxref{Bash Builtins}).
-
-@item
-The Bash @code{read} builtin (@pxref{Bash Builtins})
-will read a line ending in @samp{\} with
-the @option{-r} option, and will use the @env{REPLY} variable as a
-default if no non-option arguments are supplied.
-The Bash @code{read} builtin
-also accepts a prompt string with the @option{-p} option and will use
-Readline to obtain the line when given the @option{-e} option.
-The @code{read} builtin also has additional options to control input:
-the @option{-s} option will turn off echoing of input characters as
-they are read, the @option{-t} option will allow @code{read} to time out
-if input does not arrive within a specified number of seconds, the
-@option{-n} option will allow reading only a specified number of
-characters rather than a full line, and the @option{-d} option will read
-until a particular character rather than newline.
-
-@item
-The @code{return} builtin may be used to abort execution of scripts
-executed with the @code{.} or @code{source} builtins
-(@pxref{Bourne Shell Builtins}).
-
-@item
-Bash includes the @code{shopt} builtin, for finer control of shell
-optional capabilities (@pxref{The Shopt Builtin}), and allows these options
-to be set and unset at shell invocation (@pxref{Invoking Bash}).
-
-@item
-Bash has much more optional behavior controllable with the @code{set}
-builtin (@pxref{The Set Builtin}).
-
-@item
-The @samp{-x} (@option{xtrace}) option displays commands other than
-simple commands when performing an execution trace
-(@pxref{The Set Builtin}).
-
-@item
-The @code{test} builtin (@pxref{Bourne Shell Builtins})
-is slightly different, as it implements the @sc{posix} algorithm,
-which specifies the behavior based on the number of arguments.
-
-@item
-Bash includes the @code{caller} builtin, which displays the context of
-any active subroutine call (a shell function or a script executed with
-the @code{.} or @code{source} builtins). This supports the bash
-debugger.
-
-@item
-The @code{trap} builtin (@pxref{Bourne Shell Builtins}) allows a
-@code{DEBUG} pseudo-signal specification, similar to @code{EXIT}.
-Commands specified with a @code{DEBUG} trap are executed before every
-simple command, @code{for} command, @code{case} command,
-@code{select} command, every arithmetic @code{for} command, and before
-the first command executes in a shell function.
-The @code{DEBUG} trap is not inherited by shell functions unless the
-function has been given the @code{trace} attribute or the
-@code{functrace} option has been enabled using the @code{shopt} builtin.
-The @code{extdebug} shell option has additional effects on the
-@code{DEBUG} trap.
-
-The @code{trap} builtin (@pxref{Bourne Shell Builtins}) allows an
-@code{ERR} pseudo-signal specification, similar to @code{EXIT} and @code{DEBUG}.
-Commands specified with an @code{ERR} trap are executed after a simple
-command fails, with a few exceptions.
-The @code{ERR} trap is not inherited by shell functions unless the
-@code{-o errtrace} option to the @code{set} builtin is enabled.
-
-The @code{trap} builtin (@pxref{Bourne Shell Builtins}) allows a
-@code{RETURN} pseudo-signal specification, similar to
-@code{EXIT} and @code{DEBUG}.
-Commands specified with an @code{RETURN} trap are executed before
-execution resumes after a shell function or a shell script executed with
-@code{.} or @code{source} returns.
-The @code{RETURN} trap is not inherited by shell functions unless the
-function has been given the @code{trace} attribute or the
-@code{functrace} option has been enabled using the @code{shopt} builtin.
-
-@item
-The Bash @code{type} builtin is more extensive and gives more information
-about the names it finds (@pxref{Bash Builtins}).
-
-@item
-The Bash @code{umask} builtin permits a @option{-p} option to cause
-the output to be displayed in the form of a @code{umask} command
-that may be reused as input (@pxref{Bourne Shell Builtins}).
-
-@item
-Bash implements a @code{csh}-like directory stack, and provides the
-@code{pushd}, @code{popd}, and @code{dirs} builtins to manipulate it
-(@pxref{The Directory Stack}).
-Bash also makes the directory stack visible as the value of the
-@env{DIRSTACK} shell variable.
-
-@item
-Bash interprets special backslash-escaped characters in the prompt
-strings when interactive (@pxref{Controlling the Prompt}).
-
-@item
-The Bash restricted mode is more useful (@pxref{The Restricted Shell});
-the SVR4.2 shell restricted mode is too limited.
-
-@item
-The @code{disown} builtin can remove a job from the internal shell
-job table (@pxref{Job Control Builtins}) or suppress the sending
-of @code{SIGHUP} to a job when the shell exits as the result of a
-@code{SIGHUP}.
-
-@item
-Bash includes a number of features to support a separate debugger for
-shell scripts.
-
-@item
-The SVR4.2 shell has two privilege-related builtins
-(@code{mldmode} and @code{priv}) not present in Bash.
-
-@item
-Bash does not have the @code{stop} or @code{newgrp} builtins.
-
-@item
-Bash does not use the @env{SHACCT} variable or perform shell accounting.
-
-@item
-The SVR4.2 @code{sh} uses a @env{TIMEOUT} variable like Bash uses
-@env{TMOUT}.
-
-@end itemize
-
-@noindent
-More features unique to Bash may be found in @ref{Bash Features}.
-
-
-@appendixsec Implementation Differences From The SVR4.2 Shell
-
-Since Bash is a completely new implementation, it does not suffer from
-many of the limitations of the SVR4.2 shell. For instance:
-
-@itemize @bullet
-
-@item
-Bash does not fork a subshell when redirecting into or out of
-a shell control structure such as an @code{if} or @code{while}
-statement.
-
-@item
-Bash does not allow unbalanced quotes. The SVR4.2 shell will silently
-insert a needed closing quote at @code{EOF} under certain circumstances.
-This can be the cause of some hard-to-find errors.
-
-@item
-The SVR4.2 shell uses a baroque memory management scheme based on
-trapping @code{SIGSEGV}. If the shell is started from a process with
-@code{SIGSEGV} blocked (e.g., by using the @code{system()} C library
-function call), it misbehaves badly.
-
-@item
-In a questionable attempt at security, the SVR4.2 shell,
-when invoked without the @option{-p} option, will alter its real
-and effective @sc{uid} and @sc{gid} if they are less than some
-magic threshold value, commonly 100.
-This can lead to unexpected results.
-
-@item
-The SVR4.2 shell does not allow users to trap @code{SIGSEGV},
-@code{SIGALRM}, or @code{SIGCHLD}.
-
-@item
-The SVR4.2 shell does not allow the @env{IFS}, @env{MAILCHECK},
-@env{PATH}, @env{PS1}, or @env{PS2} variables to be unset.
-
-@item
-The SVR4.2 shell treats @samp{^} as the undocumented equivalent of
-@samp{|}.
-
-@item
-Bash allows multiple option arguments when it is invoked (@code{-x -v});
-the SVR4.2 shell allows only one option argument (@code{-xv}). In
-fact, some versions of the shell dump core if the second argument begins
-with a @samp{-}.
-
-@item
-The SVR4.2 shell exits a script if any builtin fails; Bash exits
-a script only if one of the @sc{posix} special builtins fails, and
-only for certain failures, as enumerated in the @sc{posix} standard.
-
-@item
-The SVR4.2 shell behaves differently when invoked as @code{jsh}
-(it turns on job control).
-@end itemize
-
-@node GNU Free Documentation License
-@appendix GNU Free Documentation License
-
-@include fdl.texi
-
-@node Indexes
-@appendix Indexes
-
-@menu
-* Builtin Index:: Index of Bash builtin commands.
-* Reserved Word Index:: Index of Bash reserved words.
-* Variable Index:: Quick reference helps you find the
- variable you want.
-* Function Index:: Index of bindable Readline functions.
-* Concept Index:: General index for concepts described in
- this manual.
-@end menu
-
-@node Builtin Index
-@appendixsec Index of Shell Builtin Commands
-@printindex bt
-
-@node Reserved Word Index
-@appendixsec Index of Shell Reserved Words
-@printindex rw
-
-@node Variable Index
-@appendixsec Parameter and Variable Index
-@printindex vr
-
-@node Function Index
-@appendixsec Function Index
-@printindex fn
-
-@node Concept Index
-@appendixsec Concept Index
-@printindex cp
-
-@bye
+++ /dev/null
-@ignore
-Copyright (C) 1988-2014 Free Software Foundation, Inc.
-@end ignore
-
-@set LASTCHANGE Wed Aug 27 08:43:08 EDT 2014
-
-@set EDITION 4.3
-@set VERSION 4.3
-
-@set UPDATED 27 August 2014
-@set UPDATED-MONTH August 2014
+++ /dev/null
-/* execute_cmd.c -- Execute a COMMAND structure. */
-
-/* Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "config.h"
-
-#if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX)
- #pragma alloca
-#endif /* _AIX && RISC6000 && !__GNUC__ */
-
-#include <stdio.h>
-#include "chartypes.h"
-#include "bashtypes.h"
-#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
-# include <sys/file.h>
-#endif
-#include "filecntl.h"
-#include "posixstat.h"
-#include <signal.h>
-#if defined (HAVE_SYS_PARAM_H)
-# include <sys/param.h>
-#endif
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#include "posixtime.h"
-
-#if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE)
-# include <sys/resource.h>
-#endif
-
-#if defined (HAVE_SYS_TIMES_H) && defined (HAVE_TIMES)
-# include <sys/times.h>
-#endif
-
-#include <errno.h>
-
-#if !defined (errno)
-extern int errno;
-#endif
-
-#define NEED_FPURGE_DECL
-
-#include "bashansi.h"
-#include "bashintl.h"
-
-#include "memalloc.h"
-#include "shell.h"
-#include <y.tab.h> /* use <...> so we pick it up from the build directory */
-#include "flags.h"
-#include "builtins.h"
-#include "hashlib.h"
-#include "jobs.h"
-#include "execute_cmd.h"
-#include "findcmd.h"
-#include "redir.h"
-#include "trap.h"
-#include "pathexp.h"
-#include "hashcmd.h"
-
-#if defined (COND_COMMAND)
-# include "test.h"
-#endif
-
-#include "builtins/common.h"
-#include "builtins/builtext.h" /* list of builtins */
-
-#include <glob/strmatch.h>
-#include <tilde/tilde.h>
-
-#if defined (BUFFERED_INPUT)
-# include "input.h"
-#endif
-
-#if defined (ALIAS)
-# include "alias.h"
-#endif
-
-#if defined (HISTORY)
-# include "bashhist.h"
-#endif
-
-extern int dollar_dollar_pid;
-extern int posixly_correct;
-extern int expand_aliases;
-extern int autocd;
-extern int breaking, continuing, loop_level;
-extern int parse_and_execute_level, running_trap, sourcelevel;
-extern int command_string_index, line_number;
-extern int dot_found_in_search;
-extern int already_making_children;
-extern int tempenv_assign_error;
-extern char *the_printed_command, *shell_name;
-extern pid_t last_command_subst_pid;
-extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
-extern char **subshell_argv, **subshell_envp;
-extern int subshell_argc;
-extern time_t shell_start_time;
-#if 0
-extern char *glob_argv_flags;
-#endif
-
-extern int job_control; /* XXX */
-
-extern int close __P((int));
-
-/* Static functions defined and used in this file. */
-static void close_pipes __P((int, int));
-static void do_piping __P((int, int));
-static void bind_lastarg __P((char *));
-static int shell_control_structure __P((enum command_type));
-static void cleanup_redirects __P((REDIRECT *));
-
-#if defined (JOB_CONTROL)
-static int restore_signal_mask __P((sigset_t *));
-#endif
-
-static void async_redirect_stdin __P((void));
-
-static int builtin_status __P((int));
-
-static int execute_for_command __P((FOR_COM *));
-#if defined (SELECT_COMMAND)
-static int displen __P((const char *));
-static int print_index_and_element __P((int, int, WORD_LIST *));
-static void indent __P((int, int));
-static void print_select_list __P((WORD_LIST *, int, int, int));
-static char *select_query __P((WORD_LIST *, int, char *, int));
-static int execute_select_command __P((SELECT_COM *));
-#endif
-#if defined (DPAREN_ARITHMETIC)
-static int execute_arith_command __P((ARITH_COM *));
-#endif
-#if defined (COND_COMMAND)
-static int execute_cond_node __P((COND_COM *));
-static int execute_cond_command __P((COND_COM *));
-#endif
-#if defined (COMMAND_TIMING)
-static int mkfmt __P((char *, int, int, time_t, int));
-static void print_formatted_time __P((FILE *, char *,
- time_t, int, time_t, int,
- time_t, int, int));
-static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *));
-#endif
-#if defined (ARITH_FOR_COMMAND)
-static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *));
-static int execute_arith_for_command __P((ARITH_FOR_COM *));
-#endif
-static int execute_case_command __P((CASE_COM *));
-static int execute_while_command __P((WHILE_COM *));
-static int execute_until_command __P((WHILE_COM *));
-static int execute_while_or_until __P((WHILE_COM *, int));
-static int execute_if_command __P((IF_COM *));
-static int execute_null_command __P((REDIRECT *, int, int, int));
-static void fix_assignment_words __P((WORD_LIST *));
-static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *));
-static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int));
-static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int));
-static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *,
- SHELL_VAR *,
- REDIRECT *, struct fd_bitmap *, int));
-static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *,
- sh_builtin_func_t *,
- SHELL_VAR *,
- int, int, int,
- struct fd_bitmap *,
- int));
-static int execute_disk_command __P((WORD_LIST *, REDIRECT *, char *,
- int, int, int, struct fd_bitmap *, int));
-
-static char *getinterp __P((char *, int, int *));
-static void initialize_subshell __P((void));
-static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *));
-#if defined (COPROCESS_SUPPORT)
-static int execute_coproc __P((COMMAND *, int, int, struct fd_bitmap *));
-#endif
-
-static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *));
-
-static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *));
-
-static int execute_intern_function __P((WORD_DESC *, FUNCTION_DEF *));
-
-/* Set to 1 if fd 0 was the subject of redirection to a subshell. Global
- so that reader_loop can set it to zero before executing a command. */
-int stdin_redir;
-
-/* The name of the command that is currently being executed.
- `test' needs this, for example. */
-char *this_command_name;
-
-/* The printed representation of the currently-executing command (same as
- the_printed_command), except when a trap is being executed. Useful for
- a debugger to know where exactly the program is currently executing. */
-char *the_printed_command_except_trap;
-
-/* For catching RETURN in a function. */
-int return_catch_flag;
-int return_catch_value;
-procenv_t return_catch;
-
-/* The value returned by the last synchronous command. */
-volatile int last_command_exit_value;
-
-/* Whether or not the last command (corresponding to last_command_exit_value)
- was terminated by a signal, and, if so, which one. */
-int last_command_exit_signal;
-
-/* Are we currently ignoring the -e option for the duration of a builtin's
- execution? */
-int builtin_ignoring_errexit = 0;
-
-/* The list of redirections to perform which will undo the redirections
- that I made in the shell. */
-REDIRECT *redirection_undo_list = (REDIRECT *)NULL;
-
-/* The list of redirections to perform which will undo the internal
- redirections performed by the `exec' builtin. These are redirections
- that must be undone even when exec discards redirection_undo_list. */
-REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL;
-
-/* When greater than zero, value is the `level' of builtins we are
- currently executing (e.g. `eval echo a' would have it set to 2). */
-int executing_builtin = 0;
-
-/* Non-zero if we are executing a command list (a;b;c, etc.) */
-int executing_list = 0;
-
-/* Non-zero if failing commands in a command substitution should not exit the
- shell even if -e is set. Used to pass the CMD_IGNORE_RETURN flag down to
- commands run in command substitutions by parse_and_execute. */
-int comsub_ignore_return = 0;
-
-/* Non-zero if we have just forked and are currently running in a subshell
- environment. */
-int subshell_environment;
-
-/* Count of nested subshells, like SHLVL. Available via $BASH_SUBSHELL */
-int subshell_level = 0;
-
-/* Currently-executing shell function. */
-SHELL_VAR *this_shell_function;
-
-/* If non-zero, matches in case and [[ ... ]] are case-insensitive */
-int match_ignore_case = 0;
-
-int executing_command_builtin = 0;
-
-struct stat SB; /* used for debugging */
-
-static int special_builtin_failed;
-
-static COMMAND *currently_executing_command;
-
-/* The line number that the currently executing function starts on. */
-static int function_line_number;
-
-/* XXX - set to 1 if we're running the DEBUG trap and we want to show the line
- number containing the function name. Used by executing_line_number to
- report the correct line number. Kind of a hack. */
-static int showing_function_line;
-
-/* $LINENO ($BASH_LINENO) for use by an ERR trap. Global so parse_and_execute
- can save and restore it. */
-int line_number_for_err_trap;
-
-/* A sort of function nesting level counter */
-int funcnest = 0;
-int funcnest_max = 0;
-
-int evalnest = 0; /* bash-4.4/bash-5.0 */
-int evalnest_max = 4096;
-
-volatile int from_return_trap = 0;
-
-int lastpipe_opt = 0;
-
-struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL;
-
-#define FD_BITMAP_DEFAULT_SIZE 32
-
-/* Functions to allocate and deallocate the structures used to pass
- information from the shell to its children about file descriptors
- to close. */
-struct fd_bitmap *
-new_fd_bitmap (size)
- int size;
-{
- struct fd_bitmap *ret;
-
- ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap));
-
- ret->size = size;
-
- if (size)
- {
- ret->bitmap = (char *)xmalloc (size);
- memset (ret->bitmap, '\0', size);
- }
- else
- ret->bitmap = (char *)NULL;
- return (ret);
-}
-
-void
-dispose_fd_bitmap (fdbp)
- struct fd_bitmap *fdbp;
-{
- FREE (fdbp->bitmap);
- free (fdbp);
-}
-
-void
-close_fd_bitmap (fdbp)
- struct fd_bitmap *fdbp;
-{
- register int i;
-
- if (fdbp)
- {
- for (i = 0; i < fdbp->size; i++)
- if (fdbp->bitmap[i])
- {
- close (i);
- fdbp->bitmap[i] = 0;
- }
- }
-}
-
-/* Return the line number of the currently executing command. */
-int
-executing_line_number ()
-{
- if (executing && showing_function_line == 0 &&
- (variable_context == 0 || interactive_shell == 0) &&
- currently_executing_command)
- {
-#if defined (COND_COMMAND)
- if (currently_executing_command->type == cm_cond)
- return currently_executing_command->value.Cond->line;
-#endif
-#if defined (DPAREN_ARITHMETIC)
- if (currently_executing_command->type == cm_arith)
- return currently_executing_command->value.Arith->line;
-#endif
-#if defined (ARITH_FOR_COMMAND)
- if (currently_executing_command->type == cm_arith_for)
- return currently_executing_command->value.ArithFor->line;
-#endif
-
- return line_number;
- }
- else
- return line_number;
-}
-
-/* Execute the command passed in COMMAND. COMMAND is exactly what
- read_command () places into GLOBAL_COMMAND. See "command.h" for the
- details of the command structure.
-
- EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible
- return values. Executing a command with nothing in it returns
- EXECUTION_SUCCESS. */
-int
-execute_command (command)
- COMMAND *command;
-{
- struct fd_bitmap *bitmap;
- int result;
-
- current_fds_to_close = (struct fd_bitmap *)NULL;
- bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE);
- begin_unwind_frame ("execute-command");
- add_unwind_protect (dispose_fd_bitmap, (char *)bitmap);
-
- /* Just do the command, but not asynchronously. */
- result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap);
-
- dispose_fd_bitmap (bitmap);
- discard_unwind_frame ("execute-command");
-
-#if defined (PROCESS_SUBSTITUTION)
- /* don't unlink fifos if we're in a shell function; wait until the function
- returns. */
- if (variable_context == 0)
- unlink_fifo_list ();
-#endif /* PROCESS_SUBSTITUTION */
-
- QUIT;
- return (result);
-}
-
-/* Return 1 if TYPE is a shell control structure type. */
-static int
-shell_control_structure (type)
- enum command_type type;
-{
- switch (type)
- {
-#if defined (ARITH_FOR_COMMAND)
- case cm_arith_for:
-#endif
-#if defined (SELECT_COMMAND)
- case cm_select:
-#endif
-#if defined (DPAREN_ARITHMETIC)
- case cm_arith:
-#endif
-#if defined (COND_COMMAND)
- case cm_cond:
-#endif
- case cm_case:
- case cm_while:
- case cm_until:
- case cm_if:
- case cm_for:
- case cm_group:
- case cm_function_def:
- return (1);
-
- default:
- return (0);
- }
-}
-
-/* A function to use to unwind_protect the redirection undo list
- for loops. */
-static void
-cleanup_redirects (list)
- REDIRECT *list;
-{
- do_redirections (list, RX_ACTIVE);
- dispose_redirects (list);
-}
-
-#if 0
-/* Function to unwind_protect the redirections for functions and builtins. */
-static void
-cleanup_func_redirects (list)
- REDIRECT *list;
-{
- do_redirections (list, RX_ACTIVE);
-}
-#endif
-
-void
-dispose_exec_redirects ()
-{
- if (exec_redirection_undo_list)
- {
- dispose_redirects (exec_redirection_undo_list);
- exec_redirection_undo_list = (REDIRECT *)NULL;
- }
-}
-
-#if defined (JOB_CONTROL)
-/* A function to restore the signal mask to its proper value when the shell
- is interrupted or errors occur while creating a pipeline. */
-static int
-restore_signal_mask (set)
- sigset_t *set;
-{
- return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL));
-}
-#endif /* JOB_CONTROL */
-
-#ifdef DEBUG
-/* A debugging function that can be called from gdb, for instance. */
-void
-open_files ()
-{
- register int i;
- int f, fd_table_size;
-
- fd_table_size = getdtablesize ();
-
- fprintf (stderr, "pid %ld open files:", (long)getpid ());
- for (i = 3; i < fd_table_size; i++)
- {
- if ((f = fcntl (i, F_GETFD, 0)) != -1)
- fprintf (stderr, " %d (%s)", i, f ? "close" : "open");
- }
- fprintf (stderr, "\n");
-}
-#endif
-
-static void
-async_redirect_stdin ()
-{
- int fd;
-
- fd = open ("/dev/null", O_RDONLY);
- if (fd > 0)
- {
- dup2 (fd, 0);
- close (fd);
- }
- else if (fd < 0)
- internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno));
-}
-
-#define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0)
-
-/* Execute the command passed in COMMAND, perhaps doing it asynchronously.
- COMMAND is exactly what read_command () places into GLOBAL_COMMAND.
- ASYNCHROUNOUS, if non-zero, says to do this command in the background.
- PIPE_IN and PIPE_OUT are file descriptors saying where input comes
- from and where it goes. They can have the value of NO_PIPE, which means
- I/O is stdin/stdout.
- FDS_TO_CLOSE is a list of file descriptors to close once the child has
- been forked. This list often contains the unusable sides of pipes, etc.
-
- EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible
- return values. Executing a command with nothing in it returns
- EXECUTION_SUCCESS. */
-int
-execute_command_internal (command, asynchronous, pipe_in, pipe_out,
- fds_to_close)
- COMMAND *command;
- int asynchronous;
- int pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- int exec_result, user_subshell, invert, ignore_return, was_error_trap;
- REDIRECT *my_undo_list, *exec_undo_list;
- char *tcmd;
- volatile int last_pid;
- volatile int save_line_number;
-#if defined (PROCESS_SUBSTITUTION)
- volatile int ofifo, nfifo, osize, saved_fifo;
- volatile char *ofifo_list;
-#endif
-
- if (breaking || continuing)
- return (last_command_exit_value);
- if (command == 0 || read_but_dont_execute)
- return (EXECUTION_SUCCESS);
-
- QUIT;
- run_pending_traps ();
-
-#if 0
- if (running_trap == 0)
-#endif
- currently_executing_command = command;
-
- invert = (command->flags & CMD_INVERT_RETURN) != 0;
-
- /* If we're inverting the return value and `set -e' has been executed,
- we don't want a failing command to inadvertently cause the shell
- to exit. */
- if (exit_immediately_on_error && invert) /* XXX */
- command->flags |= CMD_IGNORE_RETURN; /* XXX */
-
- exec_result = EXECUTION_SUCCESS;
-
- /* If a command was being explicitly run in a subshell, or if it is
- a shell control-structure, and it has a pipe, then we do the command
- in a subshell. */
- if (command->type == cm_subshell && (command->flags & CMD_NO_FORK))
- return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close));
-
-#if defined (COPROCESS_SUPPORT)
- if (command->type == cm_coproc)
- return (execute_coproc (command, pipe_in, pipe_out, fds_to_close));
-#endif
-
- user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0);
-
- if (command->type == cm_subshell ||
- (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) ||
- (shell_control_structure (command->type) &&
- (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous)))
- {
- pid_t paren_pid;
- int s;
-
- /* Fork a subshell, turn off the subshell bit, turn off job
- control and call execute_command () on the command again. */
- line_number_for_err_trap = line_number;
- tcmd = make_command_string (command);
- paren_pid = make_child (savestring (tcmd), asynchronous);
-
- if (user_subshell && signal_is_trapped (ERROR_TRAP) &&
- signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0)
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- if (paren_pid == 0)
- {
- /* We want to run the exit trap for forced {} subshells, and we
- want to note this before execute_in_subshell modifies the
- COMMAND struct. Need to keep in mind that execute_in_subshell
- runs the exit trap for () subshells itself. */
- /* This handles { command; } & */
- s = user_subshell == 0 && command->type == cm_group && pipe_in == NO_PIPE && pipe_out == NO_PIPE && asynchronous;
- /* run exit trap for : | { ...; } and { ...; } | : */
- /* run exit trap for : | ( ...; ) and ( ...; ) | : */
- s += user_subshell == 0 && command->type == cm_group && (pipe_in != NO_PIPE || pipe_out != NO_PIPE) && asynchronous == 0;
-
- last_command_exit_value = execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close);
- if (s)
- subshell_exit (last_command_exit_value);
- else
- exit (last_command_exit_value);
- /* NOTREACHED */
- }
- else
- {
- close_pipes (pipe_in, pipe_out);
-
-#if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD)
- if (variable_context == 0) /* wait until shell function completes */
- unlink_fifo_list ();
-#endif
- /* If we are part of a pipeline, and not the end of the pipeline,
- then we should simply return and let the last command in the
- pipe be waited for. If we are not in a pipeline, or are the
- last command in the pipeline, then we wait for the subshell
- and return its exit status as usual. */
- if (pipe_out != NO_PIPE)
- return (EXECUTION_SUCCESS);
-
- stop_pipeline (asynchronous, (COMMAND *)NULL);
-
- if (asynchronous == 0)
- {
- was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0;
- invert = (command->flags & CMD_INVERT_RETURN) != 0;
- ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0;
-
- exec_result = wait_for (paren_pid);
-
- /* If we have to, invert the return value. */
- if (invert)
- exec_result = ((exec_result == EXECUTION_SUCCESS)
- ? EXECUTION_FAILURE
- : EXECUTION_SUCCESS);
-
- last_command_exit_value = exec_result;
- if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS)
- {
- save_line_number = line_number;
- line_number = line_number_for_err_trap;
- run_error_trap ();
- line_number = save_line_number;
- }
-
- if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS)
- {
- run_pending_traps ();
- jump_to_top_level (ERREXIT);
- }
-
- return (last_command_exit_value);
- }
- else
- {
- DESCRIBE_PID (paren_pid);
-
- run_pending_traps ();
-
- /* Posix 2013 2.9.3.1: "the exit status of an asynchronous list
- shall be zero." */
- last_command_exit_value = 0;
- return (EXECUTION_SUCCESS);
- }
- }
- }
-
-#if defined (COMMAND_TIMING)
- if (command->flags & CMD_TIME_PIPELINE)
- {
- if (asynchronous)
- {
- command->flags |= CMD_FORCE_SUBSHELL;
- exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close);
- }
- else
- {
- exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close);
-#if 0
- if (running_trap == 0)
-#endif
- currently_executing_command = (COMMAND *)NULL;
- }
- return (exec_result);
- }
-#endif /* COMMAND_TIMING */
-
- if (shell_control_structure (command->type) && command->redirects)
- stdin_redir = stdin_redirects (command->redirects);
-
-#if defined (PROCESS_SUBSTITUTION)
- if (variable_context != 0)
- {
- ofifo = num_fifos ();
- ofifo_list = copy_fifo_list ((int *)&osize);
- saved_fifo = 1;
- }
- else
- saved_fifo = 0;
-#endif
-
- /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input
- redirection.) */
- if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0)
- {
- cleanup_redirects (redirection_undo_list);
- redirection_undo_list = (REDIRECT *)NULL;
- dispose_exec_redirects ();
-#if defined (PROCESS_SUBSTITUTION)
- if (saved_fifo)
- free ((void *)ofifo_list);
-#endif
- return (last_command_exit_value = EXECUTION_FAILURE);
- }
-
- if (redirection_undo_list)
- {
- /* XXX - why copy here? */
- my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list);
- dispose_redirects (redirection_undo_list);
- redirection_undo_list = (REDIRECT *)NULL;
- }
- else
- my_undo_list = (REDIRECT *)NULL;
-
- if (exec_redirection_undo_list)
- {
- /* XXX - why copy here? */
- exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list);
- dispose_redirects (exec_redirection_undo_list);
- exec_redirection_undo_list = (REDIRECT *)NULL;
- }
- else
- exec_undo_list = (REDIRECT *)NULL;
-
- if (my_undo_list || exec_undo_list)
- begin_unwind_frame ("loop_redirections");
-
- if (my_undo_list)
- add_unwind_protect ((Function *)cleanup_redirects, my_undo_list);
-
- if (exec_undo_list)
- add_unwind_protect ((Function *)dispose_redirects, exec_undo_list);
-
- ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0;
-
- QUIT;
-
- switch (command->type)
- {
- case cm_simple:
- {
- save_line_number = line_number;
- /* We can't rely on variables retaining their values across a
- call to execute_simple_command if a longjmp occurs as the
- result of a `return' builtin. This is true for sure with gcc. */
-#if defined (RECYCLES_PIDS)
- last_made_pid = NO_PID;
-#endif
- last_pid = last_made_pid;
- was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0;
-
- if (ignore_return && command->value.Simple)
- command->value.Simple->flags |= CMD_IGNORE_RETURN;
- if (command->flags & CMD_STDIN_REDIR)
- command->value.Simple->flags |= CMD_STDIN_REDIR;
-
- line_number_for_err_trap = line_number = command->value.Simple->line;
- exec_result =
- execute_simple_command (command->value.Simple, pipe_in, pipe_out,
- asynchronous, fds_to_close);
- line_number = save_line_number;
-
- /* The temporary environment should be used for only the simple
- command immediately following its definition. */
- dispose_used_env_vars ();
-
-#if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA)
- /* Reclaim memory allocated with alloca () on machines which
- may be using the alloca emulation code. */
- (void) alloca (0);
-#endif /* (ultrix && mips) || C_ALLOCA */
-
- /* If we forked to do the command, then we must wait_for ()
- the child. */
-
- /* XXX - this is something to watch out for if there are problems
- when the shell is compiled without job control. Don't worry about
- whether or not last_made_pid == last_pid; already_making_children
- tells us whether or not there are unwaited-for children to wait
- for and reap. */
- if (already_making_children && pipe_out == NO_PIPE)
- {
- stop_pipeline (asynchronous, (COMMAND *)NULL);
-
- if (asynchronous)
- {
- DESCRIBE_PID (last_made_pid);
- exec_result = EXECUTION_SUCCESS;
- invert = 0; /* async commands always succeed */
- }
- else
-#if !defined (JOB_CONTROL)
- /* Do not wait for asynchronous processes started from
- startup files. */
- if (last_made_pid != last_asynchronous_pid)
-#endif
- /* When executing a shell function that executes other
- commands, this causes the last simple command in
- the function to be waited for twice. This also causes
- subshells forked to execute builtin commands (e.g., in
- pipelines) to be waited for twice. */
- exec_result = wait_for (last_made_pid);
- }
- }
-
- /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles
- only the failure of a simple command. */
- if (was_error_trap && ignore_return == 0 && invert == 0 && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- line_number = line_number_for_err_trap;
- run_error_trap ();
- line_number = save_line_number;
- }
-
- if (ignore_return == 0 && invert == 0 &&
- ((posixly_correct && interactive == 0 && special_builtin_failed) ||
- (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS)))
- {
- last_command_exit_value = exec_result;
- run_pending_traps ();
-
-#if 0 /* XXX - bash-4.4 or bash-5.0 */
- /* Undo redirections before running exit trap on the way out of
- set -e. Report by Mark Farrell 5/19/2014 */
- if (exit_immediately_on_error && signal_is_trapped (0) &&
- unwind_protect_tag_on_stack ("saved-redirects"))
- run_unwind_frame ("saved-redirects");
-#endif
-
- jump_to_top_level (ERREXIT);
- }
-
- break;
-
- case cm_for:
- if (ignore_return)
- command->value.For->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_for_command (command->value.For);
- break;
-
-#if defined (ARITH_FOR_COMMAND)
- case cm_arith_for:
- if (ignore_return)
- command->value.ArithFor->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_arith_for_command (command->value.ArithFor);
- break;
-#endif
-
-#if defined (SELECT_COMMAND)
- case cm_select:
- if (ignore_return)
- command->value.Select->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_select_command (command->value.Select);
- break;
-#endif
-
- case cm_case:
- if (ignore_return)
- command->value.Case->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_case_command (command->value.Case);
- break;
-
- case cm_while:
- if (ignore_return)
- command->value.While->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_while_command (command->value.While);
- break;
-
- case cm_until:
- if (ignore_return)
- command->value.While->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_until_command (command->value.While);
- break;
-
- case cm_if:
- if (ignore_return)
- command->value.If->flags |= CMD_IGNORE_RETURN;
- exec_result = execute_if_command (command->value.If);
- break;
-
- case cm_group:
-
- /* This code can be executed from either of two paths: an explicit
- '{}' command, or via a function call. If we are executed via a
- function call, we have already taken care of the function being
- executed in the background (down there in execute_simple_command ()),
- and this command should *not* be marked as asynchronous. If we
- are executing a regular '{}' group command, and asynchronous == 1,
- we must want to execute the whole command in the background, so we
- need a subshell, and we want the stuff executed in that subshell
- (this group command) to be executed in the foreground of that
- subshell (i.e. there will not be *another* subshell forked).
-
- What we do is to force a subshell if asynchronous, and then call
- execute_command_internal again with asynchronous still set to 1,
- but with the original group command, so the printed command will
- look right.
-
- The code above that handles forking off subshells will note that
- both subshell and async are on, and turn off async in the child
- after forking the subshell (but leave async set in the parent, so
- the normal call to describe_pid is made). This turning off
- async is *crucial*; if it is not done, this will fall into an
- infinite loop of executions through this spot in subshell after
- subshell until the process limit is exhausted. */
-
- if (asynchronous)
- {
- command->flags |= CMD_FORCE_SUBSHELL;
- exec_result =
- execute_command_internal (command, 1, pipe_in, pipe_out,
- fds_to_close);
- }
- else
- {
- if (ignore_return && command->value.Group->command)
- command->value.Group->command->flags |= CMD_IGNORE_RETURN;
- exec_result =
- execute_command_internal (command->value.Group->command,
- asynchronous, pipe_in, pipe_out,
- fds_to_close);
- }
- break;
-
- case cm_connection:
- exec_result = execute_connection (command, asynchronous,
- pipe_in, pipe_out, fds_to_close);
- if (asynchronous)
- invert = 0; /* XXX */
-
- break;
-
-#if defined (DPAREN_ARITHMETIC)
- case cm_arith:
- was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0;
- if (ignore_return)
- command->value.Arith->flags |= CMD_IGNORE_RETURN;
- line_number_for_err_trap = save_line_number = line_number;
- exec_result = execute_arith_command (command->value.Arith);
- line_number = save_line_number;
-
- if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- save_line_number = line_number;
- line_number = line_number_for_err_trap;
- run_error_trap ();
- line_number = save_line_number;
- }
-
- if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- run_pending_traps ();
- jump_to_top_level (ERREXIT);
- }
-
- break;
-#endif
-
-#if defined (COND_COMMAND)
- case cm_cond:
- was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0;
- if (ignore_return)
- command->value.Cond->flags |= CMD_IGNORE_RETURN;
-
- line_number_for_err_trap = save_line_number = line_number;
- exec_result = execute_cond_command (command->value.Cond);
- line_number = save_line_number;
-
- if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- save_line_number = line_number;
- line_number = line_number_for_err_trap;
- run_error_trap ();
- line_number = save_line_number;
- }
-
- if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- run_pending_traps ();
- jump_to_top_level (ERREXIT);
- }
-
- break;
-#endif
-
- case cm_function_def:
- exec_result = execute_intern_function (command->value.Function_def->name,
- command->value.Function_def);
- break;
-
- default:
- command_error ("execute_command", CMDERR_BADTYPE, command->type, 0);
- }
-
- if (my_undo_list)
- {
- do_redirections (my_undo_list, RX_ACTIVE);
- dispose_redirects (my_undo_list);
- }
-
- if (exec_undo_list)
- dispose_redirects (exec_undo_list);
-
- if (my_undo_list || exec_undo_list)
- discard_unwind_frame ("loop_redirections");
-
-#if defined (PROCESS_SUBSTITUTION)
- if (saved_fifo)
- {
- nfifo = num_fifos ();
- if (nfifo > ofifo)
- close_new_fifos ((char *)ofifo_list, osize);
- free ((void *)ofifo_list);
- }
-#endif
-
- /* Invert the return value if we have to */
- if (invert)
- exec_result = (exec_result == EXECUTION_SUCCESS)
- ? EXECUTION_FAILURE
- : EXECUTION_SUCCESS;
-
-#if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND)
- /* This is where we set PIPESTATUS from the exit status of the appropriate
- compound commands (the ones that look enough like simple commands to
- cause confusion). We might be able to optimize by not doing this if
- subshell_environment != 0. */
- switch (command->type)
- {
-# if defined (DPAREN_ARITHMETIC)
- case cm_arith:
-# endif
-# if defined (COND_COMMAND)
- case cm_cond:
-# endif
- set_pipestatus_from_exit (exec_result);
- break;
- }
-#endif
-
- last_command_exit_value = exec_result;
- run_pending_traps ();
-#if 0
- if (running_trap == 0)
-#endif
- currently_executing_command = (COMMAND *)NULL;
-
- return (last_command_exit_value);
-}
-
-#if defined (COMMAND_TIMING)
-
-#if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY)
-extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *));
-extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *));
-extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *));
-#endif
-
-#define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S"
-#define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS"
-
-static const int precs[] = { 0, 100, 10, 1 };
-
-#if defined (HAVE_LOCALE_H) && defined (HAVE_LOCALECONV)
-static int
-decpoint ()
-{
- struct lconv *lv;
-
- lv = localeconv ();
- return (lv && lv->decimal_point && lv->decimal_point[0]) ? lv->decimal_point[0] : '.';
-}
-#else
-# define decpoint() '.'
-#endif
-
-/* Expand one `%'-prefixed escape sequence from a time format string. */
-static int
-mkfmt (buf, prec, lng, sec, sec_fraction)
- char *buf;
- int prec, lng;
- time_t sec;
- int sec_fraction;
-{
- time_t min;
- char abuf[INT_STRLEN_BOUND(time_t) + 1];
- int ind, aind;
-
- ind = 0;
- abuf[sizeof(abuf) - 1] = '\0';
-
- /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */
- if (lng)
- {
- min = sec / 60;
- sec %= 60;
- aind = sizeof(abuf) - 2;
- do
- abuf[aind--] = (min % 10) + '0';
- while (min /= 10);
- aind++;
- while (abuf[aind])
- buf[ind++] = abuf[aind++];
- buf[ind++] = 'm';
- }
-
- /* Now add the seconds. */
- aind = sizeof (abuf) - 2;
- do
- abuf[aind--] = (sec % 10) + '0';
- while (sec /= 10);
- aind++;
- while (abuf[aind])
- buf[ind++] = abuf[aind++];
-
- /* We want to add a decimal point and PREC places after it if PREC is
- nonzero. PREC is not greater than 3. SEC_FRACTION is between 0
- and 999. */
- if (prec != 0)
- {
- buf[ind++] = decpoint ();
- for (aind = 1; aind <= prec; aind++)
- {
- buf[ind++] = (sec_fraction / precs[aind]) + '0';
- sec_fraction %= precs[aind];
- }
- }
-
- if (lng)
- buf[ind++] = 's';
- buf[ind] = '\0';
-
- return (ind);
-}
-
-/* Interpret the format string FORMAT, interpolating the following escape
- sequences:
- %[prec][l][RUS]
-
- where the optional `prec' is a precision, meaning the number of
- characters after the decimal point, the optional `l' means to format
- using minutes and seconds (MMmNN[.FF]s), like the `times' builtin',
- and the last character is one of
-
- R number of seconds of `real' time
- U number of seconds of `user' time
- S number of seconds of `system' time
-
- An occurrence of `%%' in the format string is translated to a `%'. The
- result is printed to FP, a pointer to a FILE. The other variables are
- the seconds and thousandths of a second of real, user, and system time,
- resectively. */
-static void
-print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu)
- FILE *fp;
- char *format;
- time_t rs;
- int rsf;
- time_t us;
- int usf;
- time_t ss;
- int ssf, cpu;
-{
- int prec, lng, len;
- char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")];
- time_t sum;
- int sum_frac;
- int sindex, ssize;
-
- len = strlen (format);
- ssize = (len + 64) - (len % 64);
- str = (char *)xmalloc (ssize);
- sindex = 0;
-
- for (s = format; *s; s++)
- {
- if (*s != '%' || s[1] == '\0')
- {
- RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64);
- str[sindex++] = *s;
- }
- else if (s[1] == '%')
- {
- s++;
- RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64);
- str[sindex++] = *s;
- }
- else if (s[1] == 'P')
- {
- s++;
-#if 0
- /* clamp CPU usage at 100% */
- if (cpu > 10000)
- cpu = 10000;
-#endif
- sum = cpu / 100;
- sum_frac = (cpu % 100) * 10;
- len = mkfmt (ts, 2, 0, sum, sum_frac);
- RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64);
- strcpy (str + sindex, ts);
- sindex += len;
- }
- else
- {
- prec = 3; /* default is three places past the decimal point. */
- lng = 0; /* default is to not use minutes or append `s' */
- s++;
- if (DIGIT (*s)) /* `precision' */
- {
- prec = *s++ - '0';
- if (prec > 3) prec = 3;
- }
- if (*s == 'l') /* `length extender' */
- {
- lng = 1;
- s++;
- }
- if (*s == 'R' || *s == 'E')
- len = mkfmt (ts, prec, lng, rs, rsf);
- else if (*s == 'U')
- len = mkfmt (ts, prec, lng, us, usf);
- else if (*s == 'S')
- len = mkfmt (ts, prec, lng, ss, ssf);
- else
- {
- internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s);
- free (str);
- return;
- }
- RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64);
- strcpy (str + sindex, ts);
- sindex += len;
- }
- }
-
- str[sindex] = '\0';
- fprintf (fp, "%s\n", str);
- fflush (fp);
-
- free (str);
-}
-
-static int
-time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close)
- COMMAND *command;
- int asynchronous, pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- int rv, posix_time, old_flags, nullcmd;
- time_t rs, us, ss;
- int rsf, usf, ssf;
- int cpu;
- char *time_format;
-
-#if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY)
- struct timeval real, user, sys;
- struct timeval before, after;
-# if defined (HAVE_STRUCT_TIMEZONE)
- struct timezone dtz; /* posix doesn't define this */
-# endif
- struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */
-#else
-# if defined (HAVE_TIMES)
- clock_t tbefore, tafter, real, user, sys;
- struct tms before, after;
-# endif
-#endif
-
-#if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY)
-# if defined (HAVE_STRUCT_TIMEZONE)
- gettimeofday (&before, &dtz);
-# else
- gettimeofday (&before, (void *)NULL);
-# endif /* !HAVE_STRUCT_TIMEZONE */
- getrusage (RUSAGE_SELF, &selfb);
- getrusage (RUSAGE_CHILDREN, &kidsb);
-#else
-# if defined (HAVE_TIMES)
- tbefore = times (&before);
-# endif
-#endif
-
- posix_time = command && (command->flags & CMD_TIME_POSIX);
-
- nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0);
- if (posixly_correct && nullcmd)
- {
-#if defined (HAVE_GETRUSAGE)
- selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0;
- selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0;
- before.tv_sec = shell_start_time;
- before.tv_usec = 0;
-#else
- before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0;
- tbefore = shell_start_time;
-#endif
- }
-
- old_flags = command->flags;
- command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX);
- rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close);
- command->flags = old_flags;
-
- rs = us = ss = 0;
- rsf = usf = ssf = cpu = 0;
-
-#if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY)
-# if defined (HAVE_STRUCT_TIMEZONE)
- gettimeofday (&after, &dtz);
-# else
- gettimeofday (&after, (void *)NULL);
-# endif /* !HAVE_STRUCT_TIMEZONE */
- getrusage (RUSAGE_SELF, &selfa);
- getrusage (RUSAGE_CHILDREN, &kidsa);
-
- difftimeval (&real, &before, &after);
- timeval_to_secs (&real, &rs, &rsf);
-
- addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime),
- difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime));
- timeval_to_secs (&user, &us, &usf);
-
- addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime),
- difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime));
- timeval_to_secs (&sys, &ss, &ssf);
-
- cpu = timeval_to_cpu (&real, &user, &sys);
-#else
-# if defined (HAVE_TIMES)
- tafter = times (&after);
-
- real = tafter - tbefore;
- clock_t_to_secs (real, &rs, &rsf);
-
- user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime);
- clock_t_to_secs (user, &us, &usf);
-
- sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime);
- clock_t_to_secs (sys, &ss, &ssf);
-
- cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real;
-
-# else
- rs = us = ss = 0;
- rsf = usf = ssf = cpu = 0;
-# endif
-#endif
-
- if (posix_time)
- time_format = POSIX_TIMEFORMAT;
- else if ((time_format = get_string_value ("TIMEFORMAT")) == 0)
- {
- if (posixly_correct && nullcmd)
- time_format = "user\t%2lU\nsys\t%2lS";
- else
- time_format = BASH_TIMEFORMAT;
- }
- if (time_format && *time_format)
- print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu);
-
- return rv;
-}
-#endif /* COMMAND_TIMING */
-
-/* Execute a command that's supposed to be in a subshell. This must be
- called after make_child and we must be running in the child process.
- The caller will return or exit() immediately with the value this returns. */
-static int
-execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)
- COMMAND *command;
- int asynchronous;
- int pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- int user_subshell, return_code, function_value, should_redir_stdin, invert;
- int ois, user_coproc;
- int result;
- volatile COMMAND *tcom;
-
- USE_VAR(user_subshell);
- USE_VAR(user_coproc);
- USE_VAR(invert);
- USE_VAR(tcom);
- USE_VAR(asynchronous);
-
- subshell_level++;
- should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) &&
- pipe_in == NO_PIPE &&
- stdin_redirects (command->redirects) == 0);
-
- invert = (command->flags & CMD_INVERT_RETURN) != 0;
- user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0);
- user_coproc = command->type == cm_coproc;
-
- command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN);
-
- /* If a command is asynchronous in a subshell (like ( foo ) & or
- the special case of an asynchronous GROUP command where the
- the subshell bit is turned on down in case cm_group: below),
- turn off `asynchronous', so that two subshells aren't spawned.
- XXX - asynchronous used to be set to 0 in this block, but that
- means that setup_async_signals was never run. Now it's set to
- 0 after subshell_environment is set appropriately and setup_async_signals
- is run.
-
- This seems semantically correct to me. For example,
- ( foo ) & seems to say ``do the command `foo' in a subshell
- environment, but don't wait for that subshell to finish'',
- and "{ foo ; bar ; } &" seems to me to be like functions or
- builtins in the background, which executed in a subshell
- environment. I just don't see the need to fork two subshells. */
-
- /* Don't fork again, we are already in a subshell. A `doubly
- async' shell is not interactive, however. */
- if (asynchronous)
- {
-#if defined (JOB_CONTROL)
- /* If a construct like ( exec xxx yyy ) & is given while job
- control is active, we want to prevent exec from putting the
- subshell back into the original process group, carefully
- undoing all the work we just did in make_child. */
- original_pgrp = -1;
-#endif /* JOB_CONTROL */
- ois = interactive_shell;
- interactive_shell = 0;
- /* This test is to prevent alias expansion by interactive shells that
- run `(command) &' but to allow scripts that have enabled alias
- expansion with `shopt -s expand_alias' to continue to expand
- aliases. */
- if (ois != interactive_shell)
- expand_aliases = 0;
- }
-
- /* Subshells are neither login nor interactive. */
- login_shell = interactive = 0;
-
- if (user_subshell)
- subshell_environment = SUBSHELL_PAREN; /* XXX */
- else
- {
- subshell_environment = 0; /* XXX */
- if (asynchronous)
- subshell_environment |= SUBSHELL_ASYNC;
- if (pipe_in != NO_PIPE || pipe_out != NO_PIPE)
- subshell_environment |= SUBSHELL_PIPE;
- if (user_coproc)
- subshell_environment |= SUBSHELL_COPROC;
- }
-
- reset_terminating_signals (); /* in sig.c */
- /* Cancel traps, in trap.c. */
- /* Reset the signal handlers in the child, but don't free the
- trap strings. Set a flag noting that we have to free the
- trap strings if we run trap to change a signal disposition. */
- reset_signal_handlers ();
- subshell_environment |= SUBSHELL_RESETTRAP;
-
- /* Make sure restore_original_signals doesn't undo the work done by
- make_child to ensure that asynchronous children are immune to SIGINT
- and SIGQUIT. Turn off asynchronous to make sure more subshells are
- not spawned. */
- if (asynchronous)
- {
- setup_async_signals ();
- asynchronous = 0;
- }
-
-#if defined (JOB_CONTROL)
- set_sigchld_handler ();
-#endif /* JOB_CONTROL */
-
- set_sigint_handler ();
-
-#if defined (JOB_CONTROL)
- /* Delete all traces that there were any jobs running. This is
- only for subshells. */
- without_job_control ();
-#endif /* JOB_CONTROL */
-
- if (fds_to_close)
- close_fd_bitmap (fds_to_close);
-
- do_piping (pipe_in, pipe_out);
-
-#if defined (COPROCESS_SUPPORT)
- coproc_closeall ();
-#endif
-
- /* If this is a user subshell, set a flag if stdin was redirected.
- This is used later to decide whether to redirect fd 0 to
- /dev/null for async commands in the subshell. This adds more
- sh compatibility, but I'm not sure it's the right thing to do. */
- if (user_subshell)
- {
- stdin_redir = stdin_redirects (command->redirects);
- restore_default_signal (EXIT_TRAP);
- }
-
- /* If this is an asynchronous command (command &), we want to
- redirect the standard input from /dev/null in the absence of
- any specific redirection involving stdin. */
- if (should_redir_stdin && stdin_redir == 0)
- async_redirect_stdin ();
-
- /* Do redirections, then dispose of them before recursive call. */
- if (command->redirects)
- {
- if (do_redirections (command->redirects, RX_ACTIVE) != 0)
- exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
-
- dispose_redirects (command->redirects);
- command->redirects = (REDIRECT *)NULL;
- }
-
- if (command->type == cm_subshell)
- tcom = command->value.Subshell->command;
- else if (user_coproc)
- tcom = command->value.Coproc->command;
- else
- tcom = command;
-
- if (command->flags & CMD_TIME_PIPELINE)
- tcom->flags |= CMD_TIME_PIPELINE;
- if (command->flags & CMD_TIME_POSIX)
- tcom->flags |= CMD_TIME_POSIX;
-
- /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */
- if ((command->flags & CMD_IGNORE_RETURN) && tcom != command)
- tcom->flags |= CMD_IGNORE_RETURN;
-
- /* If this is a simple command, tell execute_disk_command that it
- might be able to get away without forking and simply exec.
- This means things like ( sleep 10 ) will only cause one fork.
- If we're timing the command or inverting its return value, however,
- we cannot do this optimization. */
- if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) &&
- ((tcom->flags & CMD_TIME_PIPELINE) == 0) &&
- ((tcom->flags & CMD_INVERT_RETURN) == 0))
- {
- tcom->flags |= CMD_NO_FORK;
- if (tcom->type == cm_simple)
- tcom->value.Simple->flags |= CMD_NO_FORK;
- }
-
- invert = (tcom->flags & CMD_INVERT_RETURN) != 0;
- tcom->flags &= ~CMD_INVERT_RETURN;
-
- result = setjmp_nosigs (top_level);
-
- /* If we're inside a function while executing this subshell, we
- need to handle a possible `return'. */
- function_value = 0;
- if (return_catch_flag)
- function_value = setjmp_nosigs (return_catch);
-
- /* If we're going to exit the shell, we don't want to invert the return
- status. */
- if (result == EXITPROG)
- invert = 0, return_code = last_command_exit_value;
- else if (result)
- return_code = (last_command_exit_value == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : last_command_exit_value;
- else if (function_value)
- return_code = return_catch_value;
- else
- return_code = execute_command_internal ((COMMAND *)tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close);
-
- /* If we are asked to, invert the return value. */
- if (invert)
- return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE
- : EXECUTION_SUCCESS;
-
- /* If we were explicitly placed in a subshell with (), we need
- to do the `shell cleanup' things, such as running traps[0]. */
- if (user_subshell && signal_is_trapped (0))
- {
- last_command_exit_value = return_code;
- return_code = run_exit_trap ();
- }
-
- subshell_level--;
- return (return_code);
- /* NOTREACHED */
-}
-
-#if defined (COPROCESS_SUPPORT)
-#define COPROC_MAX 16
-
-typedef struct cpelement
- {
- struct cpelement *next;
- struct coproc *coproc;
- }
-cpelement_t;
-
-typedef struct cplist
- {
- struct cpelement *head;
- struct cpelement *tail;
- int ncoproc;
- int lock;
- }
-cplist_t;
-
-static struct cpelement *cpe_alloc __P((struct coproc *));
-static void cpe_dispose __P((struct cpelement *));
-static struct cpelement *cpl_add __P((struct coproc *));
-static struct cpelement *cpl_delete __P((pid_t));
-static void cpl_reap __P((void));
-static void cpl_flush __P((void));
-static void cpl_closeall __P((void));
-static struct cpelement *cpl_search __P((pid_t));
-static struct cpelement *cpl_searchbyname __P((const char *));
-static void cpl_prune __P((void));
-
-static void coproc_free __P((struct coproc *));
-
-/* Will go away when there is fully-implemented support for multiple coprocs. */
-Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0, 0, 0, 0 };
-
-cplist_t coproc_list = {0, 0, 0};
-
-/* Functions to manage the list of coprocs */
-
-static struct cpelement *
-cpe_alloc (cp)
- Coproc *cp;
-{
- struct cpelement *cpe;
-
- cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement));
- cpe->coproc = cp;
- cpe->next = (struct cpelement *)0;
- return cpe;
-}
-
-static void
-cpe_dispose (cpe)
- struct cpelement *cpe;
-{
- free (cpe);
-}
-
-static struct cpelement *
-cpl_add (cp)
- Coproc *cp;
-{
- struct cpelement *cpe;
-
- cpe = cpe_alloc (cp);
-
- if (coproc_list.head == 0)
- {
- coproc_list.head = coproc_list.tail = cpe;
- coproc_list.ncoproc = 0; /* just to make sure */
- }
- else
- {
- coproc_list.tail->next = cpe;
- coproc_list.tail = cpe;
- }
- coproc_list.ncoproc++;
-
- return cpe;
-}
-
-static struct cpelement *
-cpl_delete (pid)
- pid_t pid;
-{
- struct cpelement *prev, *p;
-
- for (prev = p = coproc_list.head; p; prev = p, p = p->next)
- if (p->coproc->c_pid == pid)
- {
- prev->next = p->next; /* remove from list */
- break;
- }
-
- if (p == 0)
- return 0; /* not found */
-
-#if defined (DEBUG)
- itrace("cpl_delete: deleting %d", pid);
-#endif
-
- /* Housekeeping in the border cases. */
- if (p == coproc_list.head)
- coproc_list.head = coproc_list.head->next;
- else if (p == coproc_list.tail)
- coproc_list.tail = prev;
-
- coproc_list.ncoproc--;
- if (coproc_list.ncoproc == 0)
- coproc_list.head = coproc_list.tail = 0;
- else if (coproc_list.ncoproc == 1)
- coproc_list.tail = coproc_list.head; /* just to make sure */
-
- return (p);
-}
-
-static void
-cpl_reap ()
-{
- struct cpelement *p, *next, *nh, *nt;
-
- /* Build a new list by removing dead coprocs and fix up the coproc_list
- pointers when done. */
- nh = nt = next = (struct cpelement *)0;
- for (p = coproc_list.head; p; p = next)
- {
- next = p->next;
- if (p->coproc->c_flags & COPROC_DEAD)
- {
- coproc_list.ncoproc--; /* keep running count, fix up pointers later */
-
-#if defined (DEBUG)
- itrace("cpl_reap: deleting %d", p->coproc->c_pid);
-#endif
-
- coproc_dispose (p->coproc);
- cpe_dispose (p);
- }
- else if (nh == 0)
- nh = nt = p;
- else
- {
- nt->next = p;
- nt = nt->next;
- }
- }
-
- if (coproc_list.ncoproc == 0)
- coproc_list.head = coproc_list.tail = 0;
- else
- {
- if (nt)
- nt->next = 0;
- coproc_list.head = nh;
- coproc_list.tail = nt;
- if (coproc_list.ncoproc == 1)
- coproc_list.tail = coproc_list.head; /* just to make sure */
- }
-}
-
-/* Clear out the list of saved statuses */
-static void
-cpl_flush ()
-{
- struct cpelement *cpe, *p;
-
- for (cpe = coproc_list.head; cpe; )
- {
- p = cpe;
- cpe = cpe->next;
-
- coproc_dispose (p->coproc);
- cpe_dispose (p);
- }
-
- coproc_list.head = coproc_list.tail = 0;
- coproc_list.ncoproc = 0;
-}
-
-static void
-cpl_closeall ()
-{
- struct cpelement *cpe;
-
- for (cpe = coproc_list.head; cpe; cpe = cpe->next)
- coproc_close (cpe->coproc);
-}
-
-static void
-cpl_fdchk (fd)
- int fd;
-{
- struct cpelement *cpe;
-
- for (cpe = coproc_list.head; cpe; cpe = cpe->next)
- coproc_checkfd (cpe->coproc, fd);
-}
-
-/* Search for PID in the list of coprocs; return the cpelement struct if
- found. If not found, return NULL. */
-static struct cpelement *
-cpl_search (pid)
- pid_t pid;
-{
- struct cpelement *cpe;
-
- for (cpe = coproc_list.head ; cpe; cpe = cpe->next)
- if (cpe->coproc->c_pid == pid)
- return cpe;
- return (struct cpelement *)NULL;
-}
-
-/* Search for the coproc named NAME in the list of coprocs; return the
- cpelement struct if found. If not found, return NULL. */
-static struct cpelement *
-cpl_searchbyname (name)
- const char *name;
-{
- struct cpelement *cp;
-
- for (cp = coproc_list.head ; cp; cp = cp->next)
- if (STREQ (cp->coproc->c_name, name))
- return cp;
- return (struct cpelement *)NULL;
-}
-
-#if 0
-static void
-cpl_prune ()
-{
- struct cpelement *cp;
-
- while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX)
- {
- cp = coproc_list.head;
- coproc_list.head = coproc_list.head->next;
- coproc_dispose (cp->coproc);
- cpe_dispose (cp);
- coproc_list.ncoproc--;
- }
-}
-#endif
-
-/* These currently use a single global "shell coproc" but are written in a
- way to not preclude additional coprocs later (using the list management
- package above). */
-
-struct coproc *
-getcoprocbypid (pid)
- pid_t pid;
-{
-#if MULTIPLE_COPROCS
- struct cpelement *p;
-
- p = cpl_search (pid);
- return (p ? p->coproc : 0);
-#else
- return (pid == sh_coproc.c_pid ? &sh_coproc : 0);
-#endif
-}
-
-struct coproc *
-getcoprocbyname (name)
- const char *name;
-{
-#if MULTIPLE_COPROCS
- struct cpelement *p;
-
- p = cpl_searchbyname (name);
- return (p ? p->coproc : 0);
-#else
- return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0);
-#endif
-}
-
-void
-coproc_init (cp)
- struct coproc *cp;
-{
- cp->c_name = 0;
- cp->c_pid = NO_PID;
- cp->c_rfd = cp->c_wfd = -1;
- cp->c_rsave = cp->c_wsave = -1;
- cp->c_flags = cp->c_status = cp->c_lock = 0;
-}
-
-struct coproc *
-coproc_alloc (name, pid)
- char *name;
- pid_t pid;
-{
- struct coproc *cp;
-
-#if MULTIPLE_COPROCS
- cp = (struct coproc *)xmalloc (sizeof (struct coproc));
-#else
- cp = &sh_coproc;
-#endif
- coproc_init (cp);
- cp->c_lock = 2;
-
- cp->c_pid = pid;
- cp->c_name = savestring (name);
-#if MULTIPLE_COPROCS
- cpl_add (cp);
-#endif
- cp->c_lock = 0;
- return (cp);
-}
-
-static void
-coproc_free (cp)
- struct coproc *cp;
-{
- free (cp);
-}
-
-void
-coproc_dispose (cp)
- struct coproc *cp;
-{
- sigset_t set, oset;
-
- if (cp == 0)
- return;
-
- BLOCK_SIGNAL (SIGCHLD, set, oset);
- cp->c_lock = 3;
- coproc_unsetvars (cp);
- FREE (cp->c_name);
- coproc_close (cp);
-#if MULTIPLE_COPROCS
- coproc_free (cp);
-#else
- coproc_init (cp);
- cp->c_lock = 0;
-#endif
- UNBLOCK_SIGNAL (oset);
-}
-
-/* Placeholder for now. Will require changes for multiple coprocs */
-void
-coproc_flush ()
-{
-#if MULTIPLE_COPROCS
- cpl_flush ();
-#else
- coproc_dispose (&sh_coproc);
-#endif
-}
-
-void
-coproc_close (cp)
- struct coproc *cp;
-{
- if (cp->c_rfd >= 0)
- {
- close (cp->c_rfd);
- cp->c_rfd = -1;
- }
- if (cp->c_wfd >= 0)
- {
- close (cp->c_wfd);
- cp->c_wfd = -1;
- }
- cp->c_rsave = cp->c_wsave = -1;
-}
-
-void
-coproc_closeall ()
-{
-#if MULTIPLE_COPROCS
- cpl_closeall ();
-#else
- coproc_close (&sh_coproc); /* XXX - will require changes for multiple coprocs */
-#endif
-}
-
-void
-coproc_reap ()
-{
-#if MULTIPLE_COPROCS
- cpl_reap ();
-#else
- struct coproc *cp;
-
- cp = &sh_coproc; /* XXX - will require changes for multiple coprocs */
- if (cp && (cp->c_flags & COPROC_DEAD))
- coproc_dispose (cp);
-#endif
-}
-
-void
-coproc_rclose (cp, fd)
- struct coproc *cp;
- int fd;
-{
- if (cp->c_rfd >= 0 && cp->c_rfd == fd)
- {
- close (cp->c_rfd);
- cp->c_rfd = -1;
- }
-}
-
-void
-coproc_wclose (cp, fd)
- struct coproc *cp;
- int fd;
-{
- if (cp->c_wfd >= 0 && cp->c_wfd == fd)
- {
- close (cp->c_wfd);
- cp->c_wfd = -1;
- }
-}
-
-void
-coproc_checkfd (cp, fd)
- struct coproc *cp;
- int fd;
-{
- int update;
-
- update = 0;
- if (cp->c_rfd >= 0 && cp->c_rfd == fd)
- update = cp->c_rfd = -1;
- if (cp->c_wfd >= 0 && cp->c_wfd == fd)
- update = cp->c_wfd = -1;
- if (update)
- coproc_setvars (cp);
-}
-
-void
-coproc_fdchk (fd)
- int fd;
-{
-#if MULTIPLE_COPROCS
- cpl_fdchk (fd);
-#else
- coproc_checkfd (&sh_coproc, fd);
-#endif
-}
-
-void
-coproc_fdclose (cp, fd)
- struct coproc *cp;
- int fd;
-{
- coproc_rclose (cp, fd);
- coproc_wclose (cp, fd);
- coproc_setvars (cp);
-}
-
-void
-coproc_fdsave (cp)
- struct coproc *cp;
-{
- cp->c_rsave = cp->c_rfd;
- cp->c_wsave = cp->c_wfd;
-}
-
-void
-coproc_fdrestore (cp)
- struct coproc *cp;
-{
- cp->c_rfd = cp->c_rsave;
- cp->c_wfd = cp->c_wsave;
-}
-
-void
-coproc_pidchk (pid, status)
- pid_t pid;
-{
- struct coproc *cp;
-
-#if MULTIPLE_COPROCS
- struct cpelement *cpe;
-
- cpe = cpl_delete (pid);
- cp = cpe ? cpe->coproc : 0;
-#else
- cp = getcoprocbypid (pid);
-#endif
- if (cp)
- {
- cp->c_lock = 4;
- cp->c_status = status;
- cp->c_flags |= COPROC_DEAD;
- cp->c_flags &= ~COPROC_RUNNING;
- /* Don't dispose the coproc or unset the COPROC_XXX variables because
- this is executed in a signal handler context. Wait until coproc_reap
- takes care of it. */
- cp->c_lock = 0;
- }
-}
-
-void
-coproc_setvars (cp)
- struct coproc *cp;
-{
- SHELL_VAR *v;
- char *namevar, *t;
- int l;
-#if defined (ARRAY_VARS)
- arrayind_t ind;
-#endif
-
- if (cp->c_name == 0)
- return;
-
- l = strlen (cp->c_name);
- namevar = xmalloc (l + 16);
-
-#if defined (ARRAY_VARS)
- v = find_variable (cp->c_name);
- if (v == 0)
- v = make_new_array_variable (cp->c_name);
- if (array_p (v) == 0)
- v = convert_var_to_array (v);
-
- t = itos (cp->c_rfd);
- ind = 0;
- v = bind_array_variable (cp->c_name, ind, t, 0);
- free (t);
-
- t = itos (cp->c_wfd);
- ind = 1;
- bind_array_variable (cp->c_name, ind, t, 0);
- free (t);
-#else
- sprintf (namevar, "%s_READ", cp->c_name);
- t = itos (cp->c_rfd);
- bind_variable (namevar, t, 0);
- free (t);
- sprintf (namevar, "%s_WRITE", cp->c_name);
- t = itos (cp->c_wfd);
- bind_variable (namevar, t, 0);
- free (t);
-#endif
-
- sprintf (namevar, "%s_PID", cp->c_name);
- t = itos (cp->c_pid);
- bind_variable (namevar, t, 0);
- free (t);
-
- free (namevar);
-}
-
-void
-coproc_unsetvars (cp)
- struct coproc *cp;
-{
- int l;
- char *namevar;
-
- if (cp->c_name == 0)
- return;
-
- l = strlen (cp->c_name);
- namevar = xmalloc (l + 16);
-
- sprintf (namevar, "%s_PID", cp->c_name);
- unbind_variable (namevar);
-
-#if defined (ARRAY_VARS)
- unbind_variable (cp->c_name);
-#else
- sprintf (namevar, "%s_READ", cp->c_name);
- unbind_variable (namevar);
- sprintf (namevar, "%s_WRITE", cp->c_name);
- unbind_variable (namevar);
-#endif
-
- free (namevar);
-}
-
-static int
-execute_coproc (command, pipe_in, pipe_out, fds_to_close)
- COMMAND *command;
- int pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- int rpipe[2], wpipe[2], estat, invert;
- pid_t coproc_pid;
- Coproc *cp;
- char *tcmd;
- sigset_t set, oset;
-
- /* XXX -- can be removed after changes to handle multiple coprocs */
-#if !MULTIPLE_COPROCS
- if (sh_coproc.c_pid != NO_PID)
- internal_warning ("execute_coproc: coproc [%d:%s] still exists", sh_coproc.c_pid, sh_coproc.c_name);
- coproc_init (&sh_coproc);
-#endif
-
- invert = (command->flags & CMD_INVERT_RETURN) != 0;
- command_string_index = 0;
- tcmd = make_command_string (command);
-
- sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */
- sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */
-
- BLOCK_SIGNAL (SIGCHLD, set, oset);
-
- coproc_pid = make_child (savestring (tcmd), 1);
-
- if (coproc_pid == 0)
- {
- close (rpipe[0]);
- close (wpipe[1]);
-
- UNBLOCK_SIGNAL (oset);
- estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close);
-
- fflush (stdout);
- fflush (stderr);
-
- exit (estat);
- }
-
- close (rpipe[1]);
- close (wpipe[0]);
-
- /* XXX - possibly run Coproc->name through word expansion? */
- cp = coproc_alloc (command->value.Coproc->name, coproc_pid);
- cp->c_rfd = rpipe[0];
- cp->c_wfd = wpipe[1];
-
- SET_CLOSE_ON_EXEC (cp->c_rfd);
- SET_CLOSE_ON_EXEC (cp->c_wfd);
-
- coproc_setvars (cp);
-
- UNBLOCK_SIGNAL (oset);
-
-#if 0
- itrace ("execute_coproc: [%d] %s", coproc_pid, the_printed_command);
-#endif
-
- close_pipes (pipe_in, pipe_out);
-#if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD)
- unlink_fifo_list ();
-#endif
- stop_pipeline (1, (COMMAND *)NULL);
- DESCRIBE_PID (coproc_pid);
- run_pending_traps ();
-
- return (invert ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
-}
-#endif
-
-static void
-restore_stdin (s)
- int s;
-{
- dup2 (s, 0);
- close (s);
-}
-
-/* Catch-all cleanup function for lastpipe code for unwind-protects */
-static void
-lastpipe_cleanup (s)
- int s;
-{
- unfreeze_jobs_list ();
-}
-
-static int
-execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close)
- COMMAND *command;
- int asynchronous, pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result;
- int lstdin, lastpipe_flag, lastpipe_jid;
- COMMAND *cmd;
- struct fd_bitmap *fd_bitmap;
- pid_t lastpid;
-
-#if defined (JOB_CONTROL)
- sigset_t set, oset;
- BLOCK_CHILD (set, oset);
-#endif /* JOB_CONTROL */
-
- ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0;
-
- prev = pipe_in;
- cmd = command;
-
- while (cmd && cmd->type == cm_connection &&
- cmd->value.Connection && cmd->value.Connection->connector == '|')
- {
- /* Make a pipeline between the two commands. */
- if (pipe (fildes) < 0)
- {
- sys_error (_("pipe error"));
-#if defined (JOB_CONTROL)
- terminate_current_pipeline ();
- kill_current_pipeline ();
- UNBLOCK_CHILD (oset);
-#endif /* JOB_CONTROL */
- last_command_exit_value = EXECUTION_FAILURE;
- /* The unwind-protects installed below will take care
- of closing all of the open file descriptors. */
- throw_to_top_level ();
- return (EXECUTION_FAILURE); /* XXX */
- }
-
- /* Here is a problem: with the new file close-on-exec
- code, the read end of the pipe (fildes[0]) stays open
- in the first process, so that process will never get a
- SIGPIPE. There is no way to signal the first process
- that it should close fildes[0] after forking, so it
- remains open. No SIGPIPE is ever sent because there
- is still a file descriptor open for reading connected
- to the pipe. We take care of that here. This passes
- around a bitmap of file descriptors that must be
- closed after making a child process in execute_simple_command. */
-
- /* We need fd_bitmap to be at least as big as fildes[0].
- If fildes[0] is less than fds_to_close->size, then
- use fds_to_close->size. */
- new_bitmap_size = (fildes[0] < fds_to_close->size)
- ? fds_to_close->size
- : fildes[0] + 8;
-
- fd_bitmap = new_fd_bitmap (new_bitmap_size);
-
- /* Now copy the old information into the new bitmap. */
- xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size);
-
- /* And mark the pipe file descriptors to be closed. */
- fd_bitmap->bitmap[fildes[0]] = 1;
-
- /* In case there are pipe or out-of-processes errors, we
- want all these file descriptors to be closed when
- unwind-protects are run, and the storage used for the
- bitmaps freed up. */
- begin_unwind_frame ("pipe-file-descriptors");
- add_unwind_protect (dispose_fd_bitmap, fd_bitmap);
- add_unwind_protect (close_fd_bitmap, fd_bitmap);
- if (prev >= 0)
- add_unwind_protect (close, prev);
- dummyfd = fildes[1];
- add_unwind_protect (close, dummyfd);
-
-#if defined (JOB_CONTROL)
- add_unwind_protect (restore_signal_mask, &oset);
-#endif /* JOB_CONTROL */
-
- if (ignore_return && cmd->value.Connection->first)
- cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN;
- execute_command_internal (cmd->value.Connection->first, asynchronous,
- prev, fildes[1], fd_bitmap);
-
- if (prev >= 0)
- close (prev);
-
- prev = fildes[0];
- close (fildes[1]);
-
- dispose_fd_bitmap (fd_bitmap);
- discard_unwind_frame ("pipe-file-descriptors");
-
- cmd = cmd->value.Connection->second;
- }
-
- lastpid = last_made_pid;
-
- /* Now execute the rightmost command in the pipeline. */
- if (ignore_return && cmd)
- cmd->flags |= CMD_IGNORE_RETURN;
-
- lastpipe_flag = 0;
-
- begin_unwind_frame ("lastpipe-exec");
- lstdin = -1;
- /* If the `lastpipe' option is set with shopt, and job control is not
- enabled, execute the last element of non-async pipelines in the
- current shell environment. */
- if (lastpipe_opt && job_control == 0 && asynchronous == 0 && pipe_out == NO_PIPE && prev > 0)
- {
- lstdin = move_to_high_fd (0, 1, -1);
- if (lstdin > 0)
- {
- do_piping (prev, pipe_out);
- prev = NO_PIPE;
- add_unwind_protect (restore_stdin, lstdin);
- lastpipe_flag = 1;
- freeze_jobs_list ();
- lastpipe_jid = stop_pipeline (0, (COMMAND *)NULL); /* XXX */
- add_unwind_protect (lastpipe_cleanup, lastpipe_jid);
- }
- if (cmd)
- cmd->flags |= CMD_LASTPIPE;
- }
- if (prev >= 0)
- add_unwind_protect (close, prev);
-
- exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close);
-
- if (lstdin > 0)
- restore_stdin (lstdin);
-
- if (prev >= 0)
- close (prev);
-
-#if defined (JOB_CONTROL)
- UNBLOCK_CHILD (oset);
-#endif
-
- QUIT;
-
- if (lastpipe_flag)
- {
-#if defined (JOB_CONTROL)
- if (INVALID_JOB (lastpipe_jid) == 0)
- {
- append_process (savestring (the_printed_command_except_trap), dollar_dollar_pid, exec_result, lastpipe_jid);
- lstdin = wait_for (lastpid);
- }
- else
- lstdin = wait_for_single_pid (lastpid); /* checks bgpids list */
-#else
- lstdin = wait_for (lastpid);
-#endif
-
-#if defined (JOB_CONTROL)
- /* If wait_for removes the job from the jobs table, use result of last
- command as pipeline's exit status as usual. The jobs list can get
- frozen and unfrozen at inconvenient times if there are multiple pipelines
- running simultaneously. */
- if (INVALID_JOB (lastpipe_jid) == 0)
- exec_result = job_exit_status (lastpipe_jid);
- else if (pipefail_opt)
- exec_result = exec_result | lstdin; /* XXX */
- /* otherwise we use exec_result */
-
-#endif
- unfreeze_jobs_list ();
- }
-
- discard_unwind_frame ("lastpipe-exec");
-
- return (exec_result);
-}
-
-static int
-execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close)
- COMMAND *command;
- int asynchronous, pipe_in, pipe_out;
- struct fd_bitmap *fds_to_close;
-{
- COMMAND *tc, *second;
- int ignore_return, exec_result, was_error_trap, invert;
- volatile int save_line_number;
-
- ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0;
-
- switch (command->value.Connection->connector)
- {
- /* Do the first command asynchronously. */
- case '&':
- tc = command->value.Connection->first;
- if (tc == 0)
- return (EXECUTION_SUCCESS);
-
- if (ignore_return)
- tc->flags |= CMD_IGNORE_RETURN;
- tc->flags |= CMD_AMPERSAND;
-
- /* If this shell was compiled without job control support,
- if we are currently in a subshell via `( xxx )', or if job
- control is not active then the standard input for an
- asynchronous command is forced to /dev/null. */
-#if defined (JOB_CONTROL)
- if ((subshell_environment || !job_control) && !stdin_redir)
-#else
- if (!stdin_redir)
-#endif /* JOB_CONTROL */
- tc->flags |= CMD_STDIN_REDIR;
-
- exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close);
- QUIT;
-
- if (tc->flags & CMD_STDIN_REDIR)
- tc->flags &= ~CMD_STDIN_REDIR;
-
- second = command->value.Connection->second;
- if (second)
- {
- if (ignore_return)
- second->flags |= CMD_IGNORE_RETURN;
-
- exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close);
- }
-
- break;
-
- /* Just call execute command on both sides. */
- case ';':
- if (ignore_return)
- {
- if (command->value.Connection->first)
- command->value.Connection->first->flags |= CMD_IGNORE_RETURN;
- if (command->value.Connection->second)
- command->value.Connection->second->flags |= CMD_IGNORE_RETURN;
- }
- executing_list++;
- QUIT;
- execute_command (command->value.Connection->first);
- QUIT;
- exec_result = execute_command_internal (command->value.Connection->second,
- asynchronous, pipe_in, pipe_out,
- fds_to_close);
- executing_list--;
- break;
-
- case '|':
- was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0;
- invert = (command->flags & CMD_INVERT_RETURN) != 0;
- ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0;
-
- line_number_for_err_trap = line_number;
- exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close);
-
-itrace("execute_connection: execute_pipeline returns %d asynchronous = %d", exec_result, asynchronous);
- if (asynchronous)
- {
- exec_result = EXECUTION_SUCCESS;
- invert = 0;
- }
-
- if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- save_line_number = line_number;
- line_number = line_number_for_err_trap;
- run_error_trap ();
- line_number = save_line_number;
- }
-
- if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS)
- {
- last_command_exit_value = exec_result;
- run_pending_traps ();
- jump_to_top_level (ERREXIT);
- }
-
- break;
-
- case AND_AND:
- case OR_OR:
- if (asynchronous)
- {
- /* If we have something like `a && b &' or `a || b &', run the
- && or || stuff in a subshell. Force a subshell and just call
- execute_command_internal again. Leave asynchronous on
- so that we get a report from the parent shell about the
- background job. */
- command->flags |= CMD_FORCE_SUBSHELL;
- exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close);
- break;
- }
-
- /* Execute the first command. If the result of that is successful
- and the connector is AND_AND, or the result is not successful
- and the connector is OR_OR, then execute the second command,
- otherwise return. */
-
- executing_list++;
- if (command->value.Connection->first)
- command->value.Connection->first->flags |= CMD_IGNORE_RETURN;
-
- exec_result = execute_command (command->value.Connection->first);
- QUIT;
- if (((command->value.Connection->connector == AND_AND) &&
- (exec_result == EXECUTION_SUCCESS)) ||
- ((command->value.Connection->connector == OR_OR) &&
- (exec_result != EXECUTION_SUCCESS)))
- {
- if (ignore_return && command->value.Connection->second)
- command->value.Connection->second->flags |= CMD_IGNORE_RETURN;
-
- exec_result = execute_command (command->value.Connection->second);
- }
- executing_list--;
- break;
-
- default:
- command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0);
- jump_to_top_level (DISCARD);
- exec_result = EXECUTION_FAILURE;
- }
-
- return exec_result;
-}
-
-#define REAP() \
- do \
- { \
- if (!interactive_shell) \
- reap_dead_jobs (); \
- } \
- while (0)
-
-/* Execute a FOR command. The syntax is: FOR word_desc IN word_list;
- DO command; DONE */
-static int
-execute_for_command (for_command)
- FOR_COM *for_command;
-{
- register WORD_LIST *releaser, *list;
- SHELL_VAR *v;
- char *identifier;
- int retval, save_line_number;
-#if 0
- SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */
-#endif
-
- save_line_number = line_number;
- if (check_identifier (for_command->name, 1) == 0)
- {
- if (posixly_correct && interactive_shell == 0)
- {
- last_command_exit_value = EX_BADUSAGE;
- jump_to_top_level (ERREXIT);
- }
- return (EXECUTION_FAILURE);
- }
-
- loop_level++;
- identifier = for_command->name->word;
-
- line_number = for_command->line; /* for expansion error messages */
- list = releaser = expand_words_no_vars (for_command->map_list);
-
- begin_unwind_frame ("for");
- add_unwind_protect (dispose_words, releaser);
-
-#if 0
- if (lexical_scoping)
- {
- old_value = copy_variable (find_variable (identifier));
- if (old_value)
- add_unwind_protect (dispose_variable, old_value);
- }
-#endif
-
- if (for_command->flags & CMD_IGNORE_RETURN)
- for_command->action->flags |= CMD_IGNORE_RETURN;
-
- for (retval = EXECUTION_SUCCESS; list; list = list->next)
- {
- QUIT;
-
- line_number = for_command->line;
-
- /* Remember what this command looks like, for debugger. */
- command_string_index = 0;
- print_for_command_head (for_command);
-
- if (echo_command_at_execute)
- xtrace_print_for_command_head (for_command);
-
- /* Save this command unless it's a trap command and we're not running
- a debug trap. */
- if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0)
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- retval = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && retval != EXECUTION_SUCCESS)
- continue;
-#endif
-
- this_command_name = (char *)NULL;
- /* XXX - special ksh93 for command index variable handling */
- v = find_variable_last_nameref (identifier);
- if (v && nameref_p (v))
- {
- v = bind_variable_value (v, list->word->word, 0);
- }
- else
- v = bind_variable (identifier, list->word->word, 0);
- if (readonly_p (v) || noassign_p (v))
- {
- line_number = save_line_number;
- if (readonly_p (v) && interactive_shell == 0 && posixly_correct)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- jump_to_top_level (FORCE_EOF);
- }
- else
- {
- dispose_words (releaser);
- discard_unwind_frame ("for");
- loop_level--;
- return (EXECUTION_FAILURE);
- }
- }
- retval = execute_command (for_command->action);
- REAP ();
- QUIT;
-
- if (breaking)
- {
- breaking--;
- break;
- }
-
- if (continuing)
- {
- continuing--;
- if (continuing)
- break;
- }
- }
-
- loop_level--;
- line_number = save_line_number;
-
-#if 0
- if (lexical_scoping)
- {
- if (!old_value)
- unbind_variable (identifier);
- else
- {
- SHELL_VAR *new_value;
-
- new_value = bind_variable (identifier, value_cell(old_value), 0);
- new_value->attributes = old_value->attributes;
- dispose_variable (old_value);
- }
- }
-#endif
-
- dispose_words (releaser);
- discard_unwind_frame ("for");
- return (retval);
-}
-
-#if defined (ARITH_FOR_COMMAND)
-/* Execute an arithmetic for command. The syntax is
-
- for (( init ; step ; test ))
- do
- body
- done
-
- The execution should be exactly equivalent to
-
- eval \(\( init \)\)
- while eval \(\( test \)\) ; do
- body;
- eval \(\( step \)\)
- done
-*/
-static intmax_t
-eval_arith_for_expr (l, okp)
- WORD_LIST *l;
- int *okp;
-{
- WORD_LIST *new;
- intmax_t expresult;
- int r;
-
- new = expand_words_no_vars (l);
- if (new)
- {
- if (echo_command_at_execute)
- xtrace_print_arith_cmd (new);
- this_command_name = "(("; /* )) for expression error messages */
-
- command_string_index = 0;
- print_arith_command (new);
- if (signal_in_progress (DEBUG_TRAP) == 0)
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- r = run_debug_trap ();
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
-#if defined (DEBUGGER)
- if (debugging_mode == 0 || r == EXECUTION_SUCCESS)
- expresult = evalexp (new->word->word, okp);
- else
- {
- expresult = 0;
- if (okp)
- *okp = 1;
- }
-#else
- expresult = evalexp (new->word->word, okp);
-#endif
- dispose_words (new);
- }
- else
- {
- expresult = 0;
- if (okp)
- *okp = 1;
- }
- return (expresult);
-}
-
-static int
-execute_arith_for_command (arith_for_command)
- ARITH_FOR_COM *arith_for_command;
-{
- intmax_t expresult;
- int expok, body_status, arith_lineno, save_lineno;
-
- body_status = EXECUTION_SUCCESS;
- loop_level++;
- save_lineno = line_number;
-
- if (arith_for_command->flags & CMD_IGNORE_RETURN)
- arith_for_command->action->flags |= CMD_IGNORE_RETURN;
-
- this_command_name = "(("; /* )) for expression error messages */
-
- /* save the starting line number of the command so we can reset
- line_number before executing each expression -- for $LINENO
- and the DEBUG trap. */
- line_number = arith_lineno = arith_for_command->line;
- if (variable_context && interactive_shell)
- line_number -= function_line_number;
-
- /* Evaluate the initialization expression. */
- expresult = eval_arith_for_expr (arith_for_command->init, &expok);
- if (expok == 0)
- {
- line_number = save_lineno;
- return (EXECUTION_FAILURE);
- }
-
- while (1)
- {
- /* Evaluate the test expression. */
- line_number = arith_lineno;
- expresult = eval_arith_for_expr (arith_for_command->test, &expok);
- line_number = save_lineno;
-
- if (expok == 0)
- {
- body_status = EXECUTION_FAILURE;
- break;
- }
- REAP ();
- if (expresult == 0)
- break;
-
- /* Execute the body of the arithmetic for command. */
- QUIT;
- body_status = execute_command (arith_for_command->action);
- QUIT;
-
- /* Handle any `break' or `continue' commands executed by the body. */
- if (breaking)
- {
- breaking--;
- break;
- }
-
- if (continuing)
- {
- continuing--;
- if (continuing)
- break;
- }
-
- /* Evaluate the step expression. */
- line_number = arith_lineno;
- expresult = eval_arith_for_expr (arith_for_command->step, &expok);
- line_number = save_lineno;
-
- if (expok == 0)
- {
- body_status = EXECUTION_FAILURE;
- break;
- }
- }
-
- loop_level--;
- line_number = save_lineno;
-
- return (body_status);
-}
-#endif
-
-#if defined (SELECT_COMMAND)
-static int LINES, COLS, tabsize;
-
-#define RP_SPACE ") "
-#define RP_SPACE_LEN 2
-
-/* XXX - does not handle numbers > 1000000 at all. */
-#define NUMBER_LEN(s) \
-((s < 10) ? 1 \
- : ((s < 100) ? 2 \
- : ((s < 1000) ? 3 \
- : ((s < 10000) ? 4 \
- : ((s < 100000) ? 5 \
- : 6)))))
-
-static int
-displen (s)
- const char *s;
-{
-#if defined (HANDLE_MULTIBYTE)
- wchar_t *wcstr;
- size_t slen;
- int wclen;
-
- wcstr = 0;
- slen = mbstowcs (wcstr, s, 0);
- if (slen == -1)
- slen = 0;
- wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1));
- mbstowcs (wcstr, s, slen + 1);
- wclen = wcswidth (wcstr, slen);
- free (wcstr);
- return (wclen < 0 ? STRLEN(s) : wclen);
-#else
- return (STRLEN (s));
-#endif
-}
-
-static int
-print_index_and_element (len, ind, list)
- int len, ind;
- WORD_LIST *list;
-{
- register WORD_LIST *l;
- register int i;
-
- if (list == 0)
- return (0);
- for (i = ind, l = list; l && --i; l = l->next)
- ;
- if (l == 0) /* don't think this can happen */
- return (0);
- fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word);
- return (displen (l->word->word));
-}
-
-static void
-indent (from, to)
- int from, to;
-{
- while (from < to)
- {
- if ((to / tabsize) > (from / tabsize))
- {
- putc ('\t', stderr);
- from += tabsize - from % tabsize;
- }
- else
- {
- putc (' ', stderr);
- from++;
- }
- }
-}
-
-static void
-print_select_list (list, list_len, max_elem_len, indices_len)
- WORD_LIST *list;
- int list_len, max_elem_len, indices_len;
-{
- int ind, row, elem_len, pos, cols, rows;
- int first_column_indices_len, other_indices_len;
-
- if (list == 0)
- {
- putc ('\n', stderr);
- return;
- }
-
- cols = max_elem_len ? COLS / max_elem_len : 1;
- if (cols == 0)
- cols = 1;
- rows = list_len ? list_len / cols + (list_len % cols != 0) : 1;
- cols = list_len ? list_len / rows + (list_len % rows != 0) : 1;
-
- if (rows == 1)
- {
- rows = cols;
- cols = 1;
- }
-
- first_column_indices_len = NUMBER_LEN (rows);
- other_indices_len = indices_len;
-
- for (row = 0; row < rows; row++)
- {
- ind = row;
- pos = 0;
- while (1)
- {
- indices_len = (pos == 0) ? first_column_indices_len : other_indices_len;
- elem_len = print_index_and_element (indices_len, ind + 1, list);
- elem_len += indices_len + RP_SPACE_LEN;
- ind += rows;
- if (ind >= list_len)
- break;
- indent (pos + elem_len, pos + max_elem_len);
- pos += max_elem_len;
- }
- putc ('\n', stderr);
- }
-}
-
-/* Print the elements of LIST, one per line, preceded by an index from 1 to
- LIST_LEN. Then display PROMPT and wait for the user to enter a number.
- If the number is between 1 and LIST_LEN, return that selection. If EOF
- is read, return a null string. If a blank line is entered, or an invalid
- number is entered, the loop is executed again. */
-static char *
-select_query (list, list_len, prompt, print_menu)
- WORD_LIST *list;
- int list_len;
- char *prompt;
- int print_menu;
-{
- int max_elem_len, indices_len, len;
- intmax_t reply;
- WORD_LIST *l;
- char *repl_string, *t;
-
-#if 0
- t = get_string_value ("LINES");
- LINES = (t && *t) ? atoi (t) : 24;
-#endif
- t = get_string_value ("COLUMNS");
- COLS = (t && *t) ? atoi (t) : 80;
-
-#if 0
- t = get_string_value ("TABSIZE");
- tabsize = (t && *t) ? atoi (t) : 8;
- if (tabsize <= 0)
- tabsize = 8;
-#else
- tabsize = 8;
-#endif
-
- max_elem_len = 0;
- for (l = list; l; l = l->next)
- {
- len = displen (l->word->word);
- if (len > max_elem_len)
- max_elem_len = len;
- }
- indices_len = NUMBER_LEN (list_len);
- max_elem_len += indices_len + RP_SPACE_LEN + 2;
-
- while (1)
- {
- if (print_menu)
- print_select_list (list, list_len, max_elem_len, indices_len);
- fprintf (stderr, "%s", prompt);
- fflush (stderr);
- QUIT;
-
- if (read_builtin ((WORD_LIST *)NULL) != EXECUTION_SUCCESS)
- {
- putchar ('\n');
- return ((char *)NULL);
- }
- repl_string = get_string_value ("REPLY");
- if (*repl_string == 0)
- {
- print_menu = 1;
- continue;
- }
- if (legal_number (repl_string, &reply) == 0)
- return "";
- if (reply < 1 || reply > list_len)
- return "";
-
- for (l = list; l && --reply; l = l->next)
- ;
- return (l->word->word); /* XXX - can't be null? */
- }
-}
-
-/* Execute a SELECT command. The syntax is:
- SELECT word IN list DO command_list DONE
- Only `break' or `return' in command_list will terminate
- the command. */
-static int
-execute_select_command (select_command)
- SELECT_COM *select_command;
-{
- WORD_LIST *releaser, *list;
- SHELL_VAR *v;
- char *identifier, *ps3_prompt, *selection;
- int retval, list_len, show_menu, save_line_number;
-
- if (check_identifier (select_command->name, 1) == 0)
- return (EXECUTION_FAILURE);
-
- save_line_number = line_number;
- line_number = select_command->line;
-
- command_string_index = 0;
- print_select_command_head (select_command);
-
- if (echo_command_at_execute)
- xtrace_print_select_command_head (select_command);
-
-#if 0
- if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0)))
-#else
- if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0)
-#endif
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- retval = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && retval != EXECUTION_SUCCESS)
- return (EXECUTION_SUCCESS);
-#endif
-
- loop_level++;
- identifier = select_command->name->word;
-
- /* command and arithmetic substitution, parameter and variable expansion,
- word splitting, pathname expansion, and quote removal. */
- list = releaser = expand_words_no_vars (select_command->map_list);
- list_len = list_length (list);
- if (list == 0 || list_len == 0)
- {
- if (list)
- dispose_words (list);
- line_number = save_line_number;
- return (EXECUTION_SUCCESS);
- }
-
- begin_unwind_frame ("select");
- add_unwind_protect (dispose_words, releaser);
-
- if (select_command->flags & CMD_IGNORE_RETURN)
- select_command->action->flags |= CMD_IGNORE_RETURN;
-
- retval = EXECUTION_SUCCESS;
- show_menu = 1;
-
- while (1)
- {
- line_number = select_command->line;
- ps3_prompt = get_string_value ("PS3");
- if (ps3_prompt == 0)
- ps3_prompt = "#? ";
-
- QUIT;
- selection = select_query (list, list_len, ps3_prompt, show_menu);
- QUIT;
- if (selection == 0)
- {
- /* select_query returns EXECUTION_FAILURE if the read builtin
- fails, so we want to return failure in this case. */
- retval = EXECUTION_FAILURE;
- break;
- }
-
- v = bind_variable (identifier, selection, 0);
- if (readonly_p (v) || noassign_p (v))
- {
- if (readonly_p (v) && interactive_shell == 0 && posixly_correct)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- jump_to_top_level (FORCE_EOF);
- }
- else
- {
- dispose_words (releaser);
- discard_unwind_frame ("select");
- loop_level--;
- line_number = save_line_number;
- return (EXECUTION_FAILURE);
- }
- }
-
- retval = execute_command (select_command->action);
-
- REAP ();
- QUIT;
-
- if (breaking)
- {
- breaking--;
- break;
- }
-
- if (continuing)
- {
- continuing--;
- if (continuing)
- break;
- }
-
-#if defined (KSH_COMPATIBLE_SELECT)
- show_menu = 0;
- selection = get_string_value ("REPLY");
- if (selection && *selection == '\0')
- show_menu = 1;
-#endif
- }
-
- loop_level--;
- line_number = save_line_number;
-
- dispose_words (releaser);
- discard_unwind_frame ("select");
- return (retval);
-}
-#endif /* SELECT_COMMAND */
-
-/* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC.
- The pattern_list is a linked list of pattern clauses; each clause contains
- some patterns to compare word_desc against, and an associated command to
- execute. */
-static int
-execute_case_command (case_command)
- CASE_COM *case_command;
-{
- register WORD_LIST *list;
- WORD_LIST *wlist, *es;
- PATTERN_LIST *clauses;
- char *word, *pattern;
- int retval, match, ignore_return, save_line_number;
-
- save_line_number = line_number;
- line_number = case_command->line;
-
- command_string_index = 0;
- print_case_command_head (case_command);
-
- if (echo_command_at_execute)
- xtrace_print_case_command_head (case_command);
-
-#if 0
- if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0)))
-#else
- if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0)
-#endif
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- retval = run_debug_trap();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && retval != EXECUTION_SUCCESS)
- {
- line_number = save_line_number;
- return (EXECUTION_SUCCESS);
- }
-#endif
-
- wlist = expand_word_unsplit (case_command->word, 0);
- word = wlist ? string_list (wlist) : savestring ("");
- dispose_words (wlist);
-
- retval = EXECUTION_SUCCESS;
- ignore_return = case_command->flags & CMD_IGNORE_RETURN;
-
- begin_unwind_frame ("case");
- add_unwind_protect (xfree, word);
-
-#define EXIT_CASE() goto exit_case_command
-
- for (clauses = case_command->clauses; clauses; clauses = clauses->next)
- {
- QUIT;
- for (list = clauses->patterns; list; list = list->next)
- {
- es = expand_word_leave_quoted (list->word, 0);
-
- if (es && es->word && es->word->word && *(es->word->word))
- pattern = quote_string_for_globbing (es->word->word, QGLOB_CVTNULL);
- else
- {
- pattern = (char *)xmalloc (1);
- pattern[0] = '\0';
- }
-
- /* Since the pattern does not undergo quote removal (as per
- Posix.2, section 3.9.4.3), the strmatch () call must be able
- to recognize backslashes as escape characters. */
- match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH;
- free (pattern);
-
- dispose_words (es);
-
- if (match)
- {
- do
- {
- if (clauses->action && ignore_return)
- clauses->action->flags |= CMD_IGNORE_RETURN;
- retval = execute_command (clauses->action);
- }
- while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next));
- if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0)
- EXIT_CASE ();
- else
- break;
- }
-
- QUIT;
- }
- }
-
-exit_case_command:
- free (word);
- discard_unwind_frame ("case");
- line_number = save_line_number;
- return (retval);
-}
-
-#define CMD_WHILE 0
-#define CMD_UNTIL 1
-
-/* The WHILE command. Syntax: WHILE test DO action; DONE.
- Repeatedly execute action while executing test produces
- EXECUTION_SUCCESS. */
-static int
-execute_while_command (while_command)
- WHILE_COM *while_command;
-{
- return (execute_while_or_until (while_command, CMD_WHILE));
-}
-
-/* UNTIL is just like WHILE except that the test result is negated. */
-static int
-execute_until_command (while_command)
- WHILE_COM *while_command;
-{
- return (execute_while_or_until (while_command, CMD_UNTIL));
-}
-
-/* The body for both while and until. The only difference between the
- two is that the test value is treated differently. TYPE is
- CMD_WHILE or CMD_UNTIL. The return value for both commands should
- be EXECUTION_SUCCESS if no commands in the body are executed, and
- the status of the last command executed in the body otherwise. */
-static int
-execute_while_or_until (while_command, type)
- WHILE_COM *while_command;
- int type;
-{
- int return_value, body_status;
-
- body_status = EXECUTION_SUCCESS;
- loop_level++;
-
- while_command->test->flags |= CMD_IGNORE_RETURN;
- if (while_command->flags & CMD_IGNORE_RETURN)
- while_command->action->flags |= CMD_IGNORE_RETURN;
-
- while (1)
- {
- return_value = execute_command (while_command->test);
- REAP ();
-
- /* Need to handle `break' in the test when we would break out of the
- loop. The job control code will set `breaking' to loop_level
- when a job in a loop is stopped with SIGTSTP. If the stopped job
- is in the loop test, `breaking' will not be reset unless we do
- this, and the shell will cease to execute commands. */
- if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS)
- {
- if (breaking)
- breaking--;
- break;
- }
- if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS)
- {
- if (breaking)
- breaking--;
- break;
- }
-
- QUIT;
- body_status = execute_command (while_command->action);
- QUIT;
-
- if (breaking)
- {
- breaking--;
- break;
- }
-
- if (continuing)
- {
- continuing--;
- if (continuing)
- break;
- }
- }
- loop_level--;
-
- return (body_status);
-}
-
-/* IF test THEN command [ELSE command].
- IF also allows ELIF in the place of ELSE IF, but
- the parser makes *that* stupidity transparent. */
-static int
-execute_if_command (if_command)
- IF_COM *if_command;
-{
- int return_value, save_line_number;
-
- save_line_number = line_number;
- if_command->test->flags |= CMD_IGNORE_RETURN;
- return_value = execute_command (if_command->test);
- line_number = save_line_number;
-
- if (return_value == EXECUTION_SUCCESS)
- {
- QUIT;
-
- if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN))
- if_command->true_case->flags |= CMD_IGNORE_RETURN;
-
- return (execute_command (if_command->true_case));
- }
- else
- {
- QUIT;
-
- if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN))
- if_command->false_case->flags |= CMD_IGNORE_RETURN;
-
- return (execute_command (if_command->false_case));
- }
-}
-
-#if defined (DPAREN_ARITHMETIC)
-static int
-execute_arith_command (arith_command)
- ARITH_COM *arith_command;
-{
- int expok, save_line_number, retval;
- intmax_t expresult;
- WORD_LIST *new;
- char *exp;
-
- expresult = 0;
-
- save_line_number = line_number;
- this_command_name = "(("; /* )) */
- line_number = arith_command->line;
- /* If we're in a function, update the line number information. */
- if (variable_context && interactive_shell)
- line_number -= function_line_number;
-
- command_string_index = 0;
- print_arith_command (arith_command->exp);
-
- if (signal_in_progress (DEBUG_TRAP) == 0)
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- /* Run the debug trap before each arithmetic command, but do it after we
- update the line number information and before we expand the various
- words in the expression. */
- retval = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && retval != EXECUTION_SUCCESS)
- {
- line_number = save_line_number;
- return (EXECUTION_SUCCESS);
- }
-#endif
-
- new = expand_words_no_vars (arith_command->exp);
-
- /* If we're tracing, make a new word list with `((' at the front and `))'
- at the back and print it. */
- if (echo_command_at_execute)
- xtrace_print_arith_cmd (new);
-
- if (new)
- {
- exp = new->next ? string_list (new) : new->word->word;
- expresult = evalexp (exp, &expok);
- line_number = save_line_number;
- if (exp != new->word->word)
- free (exp);
- dispose_words (new);
- }
- else
- {
- expresult = 0;
- expok = 1;
- }
-
- if (expok == 0)
- return (EXECUTION_FAILURE);
-
- return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
-}
-#endif /* DPAREN_ARITHMETIC */
-
-#if defined (COND_COMMAND)
-
-static char * const nullstr = "";
-
-/* XXX - can COND ever be NULL when this is called? */
-static int
-execute_cond_node (cond)
- COND_COM *cond;
-{
- int result, invert, patmatch, rmatch, mflags, ignore;
- char *arg1, *arg2;
-#if 0
- char *t1, *t2;
-#endif
-
- invert = (cond->flags & CMD_INVERT_RETURN);
- ignore = (cond->flags & CMD_IGNORE_RETURN);
- if (ignore)
- {
- if (cond->left)
- cond->left->flags |= CMD_IGNORE_RETURN;
- if (cond->right)
- cond->right->flags |= CMD_IGNORE_RETURN;
- }
-
- if (cond->type == COND_EXPR)
- result = execute_cond_node (cond->left);
- else if (cond->type == COND_OR)
- {
- result = execute_cond_node (cond->left);
- if (result != EXECUTION_SUCCESS)
- result = execute_cond_node (cond->right);
- }
- else if (cond->type == COND_AND)
- {
- result = execute_cond_node (cond->left);
- if (result == EXECUTION_SUCCESS)
- result = execute_cond_node (cond->right);
- }
- else if (cond->type == COND_UNARY)
- {
- if (ignore)
- comsub_ignore_return++;
- arg1 = cond_expand_word (cond->left->op, 0);
- if (ignore)
- comsub_ignore_return--;
- if (arg1 == 0)
- arg1 = nullstr;
- if (echo_command_at_execute)
- xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL);
- result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE;
- if (arg1 != nullstr)
- free (arg1);
- }
- else if (cond->type == COND_BINARY)
- {
- rmatch = 0;
- patmatch = (((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') &&
- (cond->op->word[0] == '!' || cond->op->word[0] == '=')) ||
- (cond->op->word[0] == '=' && cond->op->word[1] == '\0'));
-#if defined (COND_REGEXP)
- rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' &&
- cond->op->word[2] == '\0');
-#endif
-
- if (ignore)
- comsub_ignore_return++;
- arg1 = cond_expand_word (cond->left->op, 0);
- if (ignore)
- comsub_ignore_return--;
- if (arg1 == 0)
- arg1 = nullstr;
- if (ignore)
- comsub_ignore_return++;
- arg2 = cond_expand_word (cond->right->op,
- (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0));
- if (ignore)
- comsub_ignore_return--;
- if (arg2 == 0)
- arg2 = nullstr;
-
- if (echo_command_at_execute)
- xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2);
-
-#if defined (COND_REGEXP)
- if (rmatch)
- {
- mflags = SHMAT_PWARN;
-#if defined (ARRAY_VARS)
- mflags |= SHMAT_SUBEXP;
-#endif
-
-#if 0
- t1 = strescape(arg1);
- t2 = strescape(arg2);
- itrace("execute_cond_node: sh_regmatch on `%s' and `%s'", t1, t2);
- free(t1);
- free(t2);
-#endif
-
- result = sh_regmatch (arg1, arg2, mflags);
- }
- else
-#endif /* COND_REGEXP */
- {
- int oe;
- oe = extended_glob;
- extended_glob = 1;
- result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE)
- ? EXECUTION_SUCCESS
- : EXECUTION_FAILURE;
- extended_glob = oe;
- }
- if (arg1 != nullstr)
- free (arg1);
- if (arg2 != nullstr)
- free (arg2);
- }
- else
- {
- command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0);
- jump_to_top_level (DISCARD);
- result = EXECUTION_FAILURE;
- }
-
- if (invert)
- result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
-
- return result;
-}
-
-static int
-execute_cond_command (cond_command)
- COND_COM *cond_command;
-{
- int retval, save_line_number;
-
- retval = EXECUTION_SUCCESS;
- save_line_number = line_number;
-
- this_command_name = "[[";
- line_number = cond_command->line;
- /* If we're in a function, update the line number information. */
- if (variable_context && interactive_shell)
- line_number -= function_line_number;
- command_string_index = 0;
- print_cond_command (cond_command);
-
- if (signal_in_progress (DEBUG_TRAP) == 0)
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = savestring (the_printed_command);
- }
-
- /* Run the debug trap before each conditional command, but do it after we
- update the line number information. */
- retval = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && retval != EXECUTION_SUCCESS)
- {
- line_number = save_line_number;
- return (EXECUTION_SUCCESS);
- }
-#endif
-
-#if 0
- debug_print_cond_command (cond_command);
-#endif
-
- last_command_exit_value = retval = execute_cond_node (cond_command);
- line_number = save_line_number;
- return (retval);
-}
-#endif /* COND_COMMAND */
-
-static void
-bind_lastarg (arg)
- char *arg;
-{
- SHELL_VAR *var;
-
- if (arg == 0)
- arg = "";
- var = bind_variable ("_", arg, 0);
- VUNSETATTR (var, att_exported);
-}
-
-/* Execute a null command. Fork a subshell if the command uses pipes or is
- to be run asynchronously. This handles all the side effects that are
- supposed to take place. */
-static int
-execute_null_command (redirects, pipe_in, pipe_out, async)
- REDIRECT *redirects;
- int pipe_in, pipe_out, async;
-{
- int r;
- int forcefork;
- REDIRECT *rd;
-
- for (forcefork = 0, rd = redirects; rd; rd = rd->next)
- forcefork += rd->rflags & REDIR_VARASSIGN;
-
- if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async)
- {
- /* We have a null command, but we really want a subshell to take
- care of it. Just fork, do piping and redirections, and exit. */
- if (make_child ((char *)NULL, async) == 0)
- {
- /* Cancel traps, in trap.c. */
- restore_original_signals (); /* XXX */
-
- do_piping (pipe_in, pipe_out);
-
-#if defined (COPROCESS_SUPPORT)
- coproc_closeall ();
-#endif
-
- subshell_environment = 0;
- if (async)
- subshell_environment |= SUBSHELL_ASYNC;
- if (pipe_in != NO_PIPE || pipe_out != NO_PIPE)
- subshell_environment |= SUBSHELL_PIPE;
-
- if (do_redirections (redirects, RX_ACTIVE) == 0)
- exit (EXECUTION_SUCCESS);
- else
- exit (EXECUTION_FAILURE);
- }
- else
- {
- close_pipes (pipe_in, pipe_out);
-#if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD)
- if (pipe_out == NO_PIPE)
- unlink_fifo_list ();
-#endif
- return (EXECUTION_SUCCESS);
- }
- }
- else
- {
- /* Even if there aren't any command names, pretend to do the
- redirections that are specified. The user expects the side
- effects to take place. If the redirections fail, then return
- failure. Otherwise, if a command substitution took place while
- expanding the command or a redirection, return the value of that
- substitution. Otherwise, return EXECUTION_SUCCESS. */
-
- r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE);
- cleanup_redirects (redirection_undo_list);
- redirection_undo_list = (REDIRECT *)NULL;
-
- if (r != 0)
- return (EXECUTION_FAILURE);
- else if (last_command_subst_pid != NO_PID)
- return (last_command_exit_value);
- else
- return (EXECUTION_SUCCESS);
- }
-}
-
-/* This is a hack to suppress word splitting for assignment statements
- given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */
-static void
-fix_assignment_words (words)
- WORD_LIST *words;
-{
- WORD_LIST *w, *wcmd;
- struct builtin *b;
- int assoc, global, array, integer;
-
- if (words == 0)
- return;
-
- b = 0;
- assoc = global = array = integer = 0;
-
- /* Skip over assignment statements preceding a command name */
- wcmd = words;
- for (wcmd = words; wcmd; wcmd = wcmd->next)
- if ((wcmd->word->flags & W_ASSIGNMENT) == 0)
- break;
-
- for (w = wcmd; w; w = w->next)
- if (w->word->flags & W_ASSIGNMENT)
- {
- if (b == 0)
- {
- /* Posix (post-2008) says that `command' doesn't change whether
- or not the builtin it shadows is a `declaration command', even
- though it removes other special builtin properties. In Posix
- mode, we skip over one or more instances of `command' and
- deal with the next word as the assignment builtin. */
- while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command"))
- wcmd = wcmd->next;
- b = builtin_address_internal (wcmd->word->word, 0);
- if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0)
- return;
- else if (b && (b->flags & ASSIGNMENT_BUILTIN))
- wcmd->word->flags |= W_ASSNBLTIN;
- }
- w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG);
-#if defined (ARRAY_VARS)
- if (assoc)
- w->word->flags |= W_ASSIGNASSOC;
- if (array)
- w->word->flags |= W_ASSIGNARRAY;
-#endif
- if (global)
- w->word->flags |= W_ASSNGLOBAL;
- if (integer)
- w->word->flags |= W_ASSIGNINT;
- }
-#if defined (ARRAY_VARS)
- /* Note that we saw an associative array option to a builtin that takes
- assignment statements. This is a bit of a kludge. */
- else if (w->word->word[0] == '-' && (strchr (w->word->word+1, 'A') || strchr (w->word->word+1, 'a') || strchr (w->word->word+1, 'g')))
-#else
- else if (w->word->word[0] == '-' && strchr (w->word->word+1, 'g'))
-#endif
- {
- if (b == 0)
- {
- while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command"))
- wcmd = wcmd->next;
- b = builtin_address_internal (wcmd->word->word, 0);
- if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0)
- return;
- else if (b && (b->flags & ASSIGNMENT_BUILTIN))
- wcmd->word->flags |= W_ASSNBLTIN;
- }
- if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'A'))
- assoc = 1;
- else if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'a'))
- array = 1;
- if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'g'))
- global = 1;
- if ((wcmd->word->flags & W_ASSNBLTIN) && strchr (w->word->word+1, 'i'))
- integer = 1;
- }
-}
-
-/* Return 1 if the file found by searching $PATH for PATHNAME, defaulting
- to PATHNAME, is a directory. Used by the autocd code below. */
-static int
-is_dirname (pathname)
- char *pathname;
-{
- char *temp;
- int ret;
-
- temp = search_for_command (pathname, 0);
- ret = (temp ? file_isdir (temp) : file_isdir (pathname));
- free (temp);
- return ret;
-}
-
-/* The meaty part of all the executions. We have to start hacking the
- real execution of commands here. Fork a process, set things up,
- execute the command. */
-static int
-execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close)
- SIMPLE_COM *simple_command;
- int pipe_in, pipe_out, async;
- struct fd_bitmap *fds_to_close;
-{
- WORD_LIST *words, *lastword;
- char *command_line, *lastarg, *temp;
- int first_word_quoted, result, builtin_is_special, already_forked, dofork;
- pid_t old_last_async_pid;
- sh_builtin_func_t *builtin;
- SHELL_VAR *func;
- volatile int old_builtin, old_command_builtin;
-
- result = EXECUTION_SUCCESS;
- special_builtin_failed = builtin_is_special = 0;
- command_line = (char *)0;
-
- QUIT;
-
- /* If we're in a function, update the line number information. */
- if (variable_context && interactive_shell && sourcelevel == 0)
- line_number -= function_line_number;
-
- /* Remember what this command line looks like at invocation. */
- command_string_index = 0;
- print_simple_command (simple_command);
-
-#if 0
- if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0)))
-#else
- if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0)
-#endif
- {
- FREE (the_printed_command_except_trap);
- the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0;
- }
-
- /* Run the debug trap before each simple command, but do it after we
- update the line number information. */
- result = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode && result != EXECUTION_SUCCESS)
- return (EXECUTION_SUCCESS);
-#endif
-
- first_word_quoted =
- simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0;
-
- last_command_subst_pid = NO_PID;
- old_last_async_pid = last_asynchronous_pid;
-
- already_forked = dofork = 0;
-
- /* If we're in a pipeline or run in the background, set DOFORK so we
- make the child early, before word expansion. This keeps assignment
- statements from affecting the parent shell's environment when they
- should not. */
- dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async;
-
- /* Something like `%2 &' should restart job 2 in the background, not cause
- the shell to fork here. */
- if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE &&
- simple_command->words && simple_command->words->word &&
- simple_command->words->word->word &&
- (simple_command->words->word->word[0] == '%'))
- dofork = 0;
-
- if (dofork)
- {
- /* Do this now, because execute_disk_command will do it anyway in the
- vast majority of cases. */
- maybe_make_export_env ();
-
- /* Don't let a DEBUG trap overwrite the command string to be saved with
- the process/job associated with this child. */
- if (make_child (savestring (the_printed_command_except_trap), async) == 0)
- {
- already_forked = 1;
- simple_command->flags |= CMD_NO_FORK;
-
- subshell_environment = SUBSHELL_FORK; /* XXX */
- if (pipe_in != NO_PIPE || pipe_out != NO_PIPE)
- subshell_environment |= SUBSHELL_PIPE;
- if (async)
- subshell_environment |= SUBSHELL_ASYNC;
-
- /* We need to do this before piping to handle some really
- pathological cases where one of the pipe file descriptors
- is < 2. */
- if (fds_to_close)
- close_fd_bitmap (fds_to_close);
-
- do_piping (pipe_in, pipe_out);
- pipe_in = pipe_out = NO_PIPE;
-#if defined (COPROCESS_SUPPORT)
- coproc_closeall ();
-#endif
-
- last_asynchronous_pid = old_last_async_pid;
-
- CHECK_SIGTERM;
- }
- else
- {
- /* Don't let simple commands that aren't the last command in a
- pipeline change $? for the rest of the pipeline (or at all). */
- if (pipe_out != NO_PIPE)
- result = last_command_exit_value;
- close_pipes (pipe_in, pipe_out);
-#if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD)
- /* Close /dev/fd file descriptors in the parent after forking the
- last child in a (possibly one-element) pipeline. Defer this
- until any running shell function completes. */
- if (pipe_out == NO_PIPE && variable_context == 0) /* XXX */
- unlink_fifo_list (); /* XXX */
-#endif
- command_line = (char *)NULL; /* don't free this. */
- bind_lastarg ((char *)NULL);
- return (result);
- }
- }
-
- /* If we are re-running this as the result of executing the `command'
- builtin, do not expand the command words a second time. */
- if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0)
- {
- current_fds_to_close = fds_to_close;
- fix_assignment_words (simple_command->words);
- /* Pass the ignore return flag down to command substitutions */
- if (simple_command->flags & CMD_IGNORE_RETURN) /* XXX */
- comsub_ignore_return++;
- words = expand_words (simple_command->words);
- if (simple_command->flags & CMD_IGNORE_RETURN)
- comsub_ignore_return--;
- current_fds_to_close = (struct fd_bitmap *)NULL;
- }
- else
- words = copy_word_list (simple_command->words);
-
- /* It is possible for WORDS not to have anything left in it.
- Perhaps all the words consisted of `$foo', and there was
- no variable `$foo'. */
- if (words == 0)
- {
- this_command_name = 0;
- result = execute_null_command (simple_command->redirects,
- pipe_in, pipe_out,
- already_forked ? 0 : async);
- if (already_forked)
- exit (result);
- else
- {
- bind_lastarg ((char *)NULL);
- set_pipestatus_from_exit (result);
- return (result);
- }
- }
-
- lastarg = (char *)NULL;
-
- begin_unwind_frame ("simple-command");
-
- if (echo_command_at_execute)
- xtrace_print_word_list (words, 1);
-
- builtin = (sh_builtin_func_t *)NULL;
- func = (SHELL_VAR *)NULL;
- if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0)
- {
- /* Posix.2 says special builtins are found before functions. We
- don't set builtin_is_special anywhere other than here, because
- this path is followed only when the `command' builtin is *not*
- being used, and we don't want to exit the shell if a special
- builtin executed with `command builtin' fails. `command' is not
- a special builtin. */
- if (posixly_correct)
- {
- builtin = find_special_builtin (words->word->word);
- if (builtin)
- builtin_is_special = 1;
- }
- if (builtin == 0)
- func = find_function (words->word->word);
- }
-
- /* In POSIX mode, assignment errors in the temporary environment cause a
- non-interactive shell to exit. */
- if (posixly_correct && builtin_is_special && interactive_shell == 0 && tempenv_assign_error)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- jump_to_top_level (ERREXIT);
- }
- tempenv_assign_error = 0; /* don't care about this any more */
-
- add_unwind_protect (dispose_words, words);
- QUIT;
-
- /* Bind the last word in this command to "$_" after execution. */
- for (lastword = words; lastword->next; lastword = lastword->next)
- ;
- lastarg = lastword->word->word;
-
-#if defined (JOB_CONTROL)
- /* Is this command a job control related thing? */
- if (words->word->word[0] == '%' && already_forked == 0)
- {
- this_command_name = async ? "bg" : "fg";
- last_shell_builtin = this_shell_builtin;
- this_shell_builtin = builtin_address (this_command_name);
- result = (*this_shell_builtin) (words);
- goto return_result;
- }
-
- /* One other possibililty. The user may want to resume an existing job.
- If they do, find out whether this word is a candidate for a running
- job. */
- if (job_control && already_forked == 0 && async == 0 &&
- !first_word_quoted &&
- !words->next &&
- words->word->word[0] &&
- !simple_command->redirects &&
- pipe_in == NO_PIPE &&
- pipe_out == NO_PIPE &&
- (temp = get_string_value ("auto_resume")))
- {
- int job, jflags, started_status;
-
- jflags = JM_STOPPED|JM_FIRSTMATCH;
- if (STREQ (temp, "exact"))
- jflags |= JM_EXACT;
- else if (STREQ (temp, "substring"))
- jflags |= JM_SUBSTRING;
- else
- jflags |= JM_PREFIX;
- job = get_job_by_name (words->word->word, jflags);
- if (job != NO_JOB)
- {
- run_unwind_frame ("simple-command");
- this_command_name = "fg";
- last_shell_builtin = this_shell_builtin;
- this_shell_builtin = builtin_address ("fg");
-
- started_status = start_job (job, 1);
- return ((started_status < 0) ? EXECUTION_FAILURE : started_status);
- }
- }
-#endif /* JOB_CONTROL */
-
-run_builtin:
- /* Remember the name of this command globally. */
- this_command_name = words->word->word;
-
- QUIT;
-
- /* This command could be a shell builtin or a user-defined function.
- We have already found special builtins by this time, so we do not
- set builtin_is_special. If this is a function or builtin, and we
- have pipes, then fork a subshell in here. Otherwise, just execute
- the command directly. */
- if (func == 0 && builtin == 0)
- builtin = find_shell_builtin (this_command_name);
-
- last_shell_builtin = this_shell_builtin;
- this_shell_builtin = builtin;
-
- if (builtin || func)
- {
- if (builtin)
- {
- old_builtin = executing_builtin;
- old_command_builtin = executing_command_builtin;
- unwind_protect_int (executing_builtin); /* modified in execute_builtin */
- unwind_protect_int (executing_command_builtin); /* ditto */
- }
- if (already_forked)
- {
- /* reset_terminating_signals (); */ /* XXX */
- /* Reset the signal handlers in the child, but don't free the
- trap strings. Set a flag noting that we have to free the
- trap strings if we run trap to change a signal disposition. */
- reset_signal_handlers ();
- subshell_environment |= SUBSHELL_RESETTRAP;
-
- if (async)
- {
- if ((simple_command->flags & CMD_STDIN_REDIR) &&
- pipe_in == NO_PIPE &&
- (stdin_redirects (simple_command->redirects) == 0))
- async_redirect_stdin ();
- setup_async_signals ();
- }
-
- subshell_level++;
- execute_subshell_builtin_or_function
- (words, simple_command->redirects, builtin, func,
- pipe_in, pipe_out, async, fds_to_close,
- simple_command->flags);
- subshell_level--;
- }
- else
- {
- result = execute_builtin_or_function
- (words, builtin, func, simple_command->redirects, fds_to_close,
- simple_command->flags);
- if (builtin)
- {
- if (result > EX_SHERRBASE)
- {
- switch (result)
- {
- case EX_REDIRFAIL:
- case EX_BADASSIGN:
- case EX_EXPFAIL:
- /* These errors cause non-interactive posix mode shells to exit */
- if (posixly_correct && builtin_is_special && interactive_shell == 0)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- jump_to_top_level (ERREXIT);
- }
- }
- result = builtin_status (result);
- if (builtin_is_special)
- special_builtin_failed = 1;
- }
- /* In POSIX mode, if there are assignment statements preceding
- a special builtin, they persist after the builtin
- completes. */
- if (posixly_correct && builtin_is_special && temporary_env)
- merge_temporary_env ();
- }
- else /* function */
- {
- if (result == EX_USAGE)
- result = EX_BADUSAGE;
- else if (result > EX_SHERRBASE)
- result = EXECUTION_FAILURE;
- }
-
- set_pipestatus_from_exit (result);
-
- goto return_result;
- }
- }
-
- if (autocd && interactive && words->word && is_dirname (words->word->word))
- {
- words = make_word_list (make_word ("cd"), words);
- xtrace_print_word_list (words, 0);
- goto run_builtin;
- }
-
- if (command_line == 0)
- command_line = savestring (the_printed_command_except_trap ? the_printed_command_except_trap : "");
-
-#if defined (PROCESS_SUBSTITUTION)
- if ((subshell_environment & SUBSHELL_COMSUB) && (simple_command->flags & CMD_NO_FORK) && fifos_pending() > 0)
- simple_command->flags &= ~CMD_NO_FORK;
-#endif
-
- result = execute_disk_command (words, simple_command->redirects, command_line,
- pipe_in, pipe_out, async, fds_to_close,
- simple_command->flags);
-
- return_result:
- bind_lastarg (lastarg);
- FREE (command_line);
- dispose_words (words);
- if (builtin)
- {
- executing_builtin = old_builtin;
- executing_command_builtin = old_command_builtin;
- }
- discard_unwind_frame ("simple-command");
- this_command_name = (char *)NULL; /* points to freed memory now */
- return (result);
-}
-
-/* Translate the special builtin exit statuses. We don't really need a
- function for this; it's a placeholder for future work. */
-static int
-builtin_status (result)
- int result;
-{
- int r;
-
- switch (result)
- {
- case EX_USAGE:
- r = EX_BADUSAGE;
- break;
- case EX_REDIRFAIL:
- case EX_BADSYNTAX:
- case EX_BADASSIGN:
- case EX_EXPFAIL:
- r = EXECUTION_FAILURE;
- break;
- default:
- r = EXECUTION_SUCCESS;
- break;
- }
- return (r);
-}
-
-static int
-execute_builtin (builtin, words, flags, subshell)
- sh_builtin_func_t *builtin;
- WORD_LIST *words;
- int flags, subshell;
-{
- int old_e_flag, result, eval_unwind;
- int isbltinenv;
- char *error_trap;
-
- error_trap = 0;
- old_e_flag = exit_immediately_on_error;
-
- /* The eval builtin calls parse_and_execute, which does not know about
- the setting of flags, and always calls the execution functions with
- flags that will exit the shell on an error if -e is set. If the
- eval builtin is being called, and we're supposed to ignore the exit
- value of the command, we turn the -e flag off ourselves and disable
- the ERR trap, then restore them when the command completes. This is
- also a problem (as below) for the command and source/. builtins. */
- if (subshell == 0 && (flags & CMD_IGNORE_RETURN) &&
- (builtin == eval_builtin || builtin == command_builtin || builtin == source_builtin))
- {
- begin_unwind_frame ("eval_builtin");
- unwind_protect_int (exit_immediately_on_error);
- unwind_protect_int (builtin_ignoring_errexit);
- error_trap = TRAP_STRING (ERROR_TRAP);
- if (error_trap)
- {
- error_trap = savestring (error_trap);
- add_unwind_protect (xfree, error_trap);
- add_unwind_protect (set_error_trap, error_trap);
- restore_default_signal (ERROR_TRAP);
- }
- exit_immediately_on_error = 0;
- builtin_ignoring_errexit = 1;
- eval_unwind = 1;
- }
- else
- eval_unwind = 0;
-
- /* The temporary environment for a builtin is supposed to apply to
- all commands executed by that builtin. Currently, this is a
- problem only with the `unset', `source' and `eval' builtins.
- `mapfile' is a special case because it uses evalstring (same as
- eval or source) to run its callbacks. */
- isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin || builtin == mapfile_builtin);
-
- if (isbltinenv)
- {
- if (subshell == 0)
- begin_unwind_frame ("builtin_env");
-
- if (temporary_env)
- {
- push_scope (VC_BLTNENV, temporary_env);
- if (subshell == 0)
- add_unwind_protect (pop_scope, (flags & CMD_COMMAND_BUILTIN) ? 0 : "1");
- temporary_env = (HASH_TABLE *)NULL;
- }
- }
-
- if (subshell == 0 && builtin == eval_builtin)
- {
- if (evalnest_max > 0 && evalnest >= evalnest_max)
- {
- internal_error (_("eval: maximum eval nesting level exceeded (%d)"), evalnest);
- evalnest = 0;
- jump_to_top_level (DISCARD);
- }
- unwind_protect_int (evalnest);
- /* The test for subshell == 0 above doesn't make a difference */
- evalnest++; /* execute_subshell_builtin_or_function sets this to 0 */
- }
-
- /* `return' does a longjmp() back to a saved environment in execute_function.
- If a variable assignment list preceded the command, and the shell is
- running in POSIX mode, we need to merge that into the shell_variables
- table, since `return' is a POSIX special builtin. */
- if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env)
- {
- begin_unwind_frame ("return_temp_env");
- add_unwind_protect (merge_temporary_env, (char *)NULL);
- }
-
- executing_builtin++;
- executing_command_builtin |= builtin == command_builtin;
- result = ((*builtin) (words->next));
-
- /* This shouldn't happen, but in case `return' comes back instead of
- longjmp'ing, we need to unwind. */
- if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env)
- discard_unwind_frame ("return_temp_env");
-
- if (subshell == 0 && isbltinenv)
- run_unwind_frame ("builtin_env");
-
- if (eval_unwind)
- {
- exit_immediately_on_error = errexit_flag;
- builtin_ignoring_errexit = 0;
- if (error_trap)
- {
- set_error_trap (error_trap);
- xfree (error_trap);
- }
- discard_unwind_frame ("eval_builtin");
- }
-
- return (result);
-}
-
-static int
-execute_function (var, words, flags, fds_to_close, async, subshell)
- SHELL_VAR *var;
- WORD_LIST *words;
- int flags;
- struct fd_bitmap *fds_to_close;
- int async, subshell;
-{
- int return_val, result;
- COMMAND *tc, *fc, *save_current;
- char *debug_trap, *error_trap, *return_trap;
-#if defined (ARRAY_VARS)
- SHELL_VAR *funcname_v, *nfv, *bash_source_v, *bash_lineno_v;
- ARRAY *funcname_a;
- volatile ARRAY *bash_source_a;
- volatile ARRAY *bash_lineno_a;
-#endif
- FUNCTION_DEF *shell_fn;
- char *sfile, *t;
-
- USE_VAR(fc);
-
- if (funcnest_max > 0 && funcnest >= funcnest_max)
- {
- internal_error (_("%s: maximum function nesting level exceeded (%d)"), var->name, funcnest);
- funcnest = 0; /* XXX - should we reset it somewhere else? */
- jump_to_top_level (DISCARD);
- }
-
-#if defined (ARRAY_VARS)
- GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
- GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
- GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
-#endif
-
- tc = (COMMAND *)copy_command (function_cell (var));
- if (tc && (flags & CMD_IGNORE_RETURN))
- tc->flags |= CMD_IGNORE_RETURN;
-
- if (subshell == 0)
- {
- begin_unwind_frame ("function_calling");
- push_context (var->name, subshell, temporary_env);
- add_unwind_protect (pop_context, (char *)NULL);
- unwind_protect_int (line_number);
- unwind_protect_int (return_catch_flag);
- unwind_protect_jmp_buf (return_catch);
- add_unwind_protect (dispose_command, (char *)tc);
- unwind_protect_pointer (this_shell_function);
- unwind_protect_int (loop_level);
- unwind_protect_int (funcnest);
- }
- else
- push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */
-
- temporary_env = (HASH_TABLE *)NULL;
-
- this_shell_function = var;
- make_funcname_visible (1);
-
- debug_trap = TRAP_STRING(DEBUG_TRAP);
- error_trap = TRAP_STRING(ERROR_TRAP);
- return_trap = TRAP_STRING(RETURN_TRAP);
-
- /* The order of the unwind protects for debug_trap, error_trap and
- return_trap is important here! unwind-protect commands are run
- in reverse order of registration. If this causes problems, take
- out the xfree unwind-protect calls and live with the small memory leak. */
-
- /* function_trace_mode != 0 means that all functions inherit the DEBUG trap.
- if the function has the trace attribute set, it inherits the DEBUG trap */
- if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0))
- {
- if (subshell == 0)
- {
- debug_trap = savestring (debug_trap);
- add_unwind_protect (xfree, debug_trap);
- add_unwind_protect (set_debug_trap, debug_trap);
- }
- restore_default_signal (DEBUG_TRAP);
- }
-
- /* error_trace_mode != 0 means that functions inherit the ERR trap. */
- if (error_trap && error_trace_mode == 0)
- {
- if (subshell == 0)
- {
- error_trap = savestring (error_trap);
- add_unwind_protect (xfree, error_trap);
- add_unwind_protect (set_error_trap, error_trap);
- }
- restore_default_signal (ERROR_TRAP);
- }
-
- /* Shell functions inherit the RETURN trap if function tracing is on
- globally or on individually for this function. */
-#if 0
- if (return_trap && ((trace_p (var) == 0) && function_trace_mode == 0))
-#else
- if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0)))
-#endif
- {
- if (subshell == 0)
- {
- return_trap = savestring (return_trap);
- add_unwind_protect (xfree, return_trap);
- add_unwind_protect (set_return_trap, return_trap);
- }
- restore_default_signal (RETURN_TRAP);
- }
-
- funcnest++;
-#if defined (ARRAY_VARS)
- /* This is quite similar to the code in shell.c and elsewhere. */
- shell_fn = find_function_def (this_shell_function->name);
- sfile = shell_fn ? shell_fn->source_file : "";
- array_push ((ARRAY *)funcname_a, this_shell_function->name);
-
- array_push ((ARRAY *)bash_source_a, sfile);
- t = itos (executing_line_number ());
- array_push ((ARRAY *)bash_lineno_a, t);
- free (t);
-#endif
-
- /* The temporary environment for a function is supposed to apply to
- all commands executed within the function body. */
-
- remember_args (words->next, 1);
-
- /* Update BASH_ARGV and BASH_ARGC */
- if (debugging_mode)
- push_args (words->next);
-
- /* Number of the line on which the function body starts. */
- line_number = function_line_number = tc->line;
-
-#if defined (JOB_CONTROL)
- if (subshell)
- stop_pipeline (async, (COMMAND *)NULL);
-#endif
-
- fc = tc;
-
- from_return_trap = 0;
-
- return_catch_flag++;
- return_val = setjmp_nosigs (return_catch);
-
- if (return_val)
- {
- result = return_catch_value;
- /* Run the RETURN trap in the function's context. */
- save_current = currently_executing_command;
- if (from_return_trap == 0)
- run_return_trap ();
- currently_executing_command = save_current;
- }
- else
- {
- /* Run the debug trap here so we can trap at the start of a function's
- execution rather than the execution of the body's first command. */
- showing_function_line = 1;
- save_current = currently_executing_command;
- result = run_debug_trap ();
-#if defined (DEBUGGER)
- /* In debugging mode, if the DEBUG trap returns a non-zero status, we
- skip the command. */
- if (debugging_mode == 0 || result == EXECUTION_SUCCESS)
- {
- showing_function_line = 0;
- currently_executing_command = save_current;
- result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close);
-
- /* Run the RETURN trap in the function's context */
- save_current = currently_executing_command;
- run_return_trap ();
- currently_executing_command = save_current;
- }
-#else
- result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close);
-
- save_current = currently_executing_command;
- run_return_trap ();
- currently_executing_command = save_current;
-#endif
- showing_function_line = 0;
- }
-
- /* Restore BASH_ARGC and BASH_ARGV */
- if (debugging_mode)
- pop_args ();
-
- if (subshell == 0)
- run_unwind_frame ("function_calling");
-
-#if defined (ARRAY_VARS)
- /* These two variables cannot be unset, and cannot be affected by the
- function. */
- array_pop ((ARRAY *)bash_source_a);
- array_pop ((ARRAY *)bash_lineno_a);
-
- /* FUNCNAME can be unset, and so can potentially be changed by the
- function. */
- GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a);
- if (nfv == funcname_v)
- array_pop (funcname_a);
-#endif
-
- if (variable_context == 0 || this_shell_function == 0)
- {
- make_funcname_visible (0);
-#if defined (PROCESS_SUBSTITUTION)
- unlink_fifo_list ();
-#endif
- }
-
- return (result);
-}
-
-/* A convenience routine for use by other parts of the shell to execute
- a particular shell function. */
-int
-execute_shell_function (var, words)
- SHELL_VAR *var;
- WORD_LIST *words;
-{
- int ret;
- struct fd_bitmap *bitmap;
-
- bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE);
- begin_unwind_frame ("execute-shell-function");
- add_unwind_protect (dispose_fd_bitmap, (char *)bitmap);
-
- ret = execute_function (var, words, 0, bitmap, 0, 0);
-
- dispose_fd_bitmap (bitmap);
- discard_unwind_frame ("execute-shell-function");
-
- return ret;
-}
-
-/* Execute a shell builtin or function in a subshell environment. This
- routine does not return; it only calls exit(). If BUILTIN is non-null,
- it points to a function to call to execute a shell builtin; otherwise
- VAR points at the body of a function to execute. WORDS is the arguments
- to the command, REDIRECTS specifies redirections to perform before the
- command is executed. */
-static void
-execute_subshell_builtin_or_function (words, redirects, builtin, var,
- pipe_in, pipe_out, async, fds_to_close,
- flags)
- WORD_LIST *words;
- REDIRECT *redirects;
- sh_builtin_func_t *builtin;
- SHELL_VAR *var;
- int pipe_in, pipe_out, async;
- struct fd_bitmap *fds_to_close;
- int flags;
-{
- int result, r, funcvalue;
-#if defined (JOB_CONTROL)
- int jobs_hack;
-
- jobs_hack = (builtin == jobs_builtin) &&
- ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE);
-#endif
-
- /* A subshell is neither a login shell nor interactive. */
- login_shell = interactive = 0;
- if (builtin == eval_builtin)
- evalnest = 0;
-
- if (async)
- subshell_environment |= SUBSHELL_ASYNC;
- if (pipe_in != NO_PIPE || pipe_out != NO_PIPE)
- subshell_environment |= SUBSHELL_PIPE;
-
- maybe_make_export_env (); /* XXX - is this needed? */
-
-#if defined (JOB_CONTROL)
- /* Eradicate all traces of job control after we fork the subshell, so
- all jobs begun by this subshell are in the same process group as
- the shell itself. */
-
- /* Allow the output of `jobs' to be piped. */
- if (jobs_hack)
- kill_current_pipeline ();
- else
- without_job_control ();
-
- set_sigchld_handler ();
-#endif /* JOB_CONTROL */
-
- set_sigint_handler ();
-
- if (fds_to_close)
- close_fd_bitmap (fds_to_close);
-
- do_piping (pipe_in, pipe_out);
-
- if (do_redirections (redirects, RX_ACTIVE) != 0)
- exit (EXECUTION_FAILURE);
-
- if (builtin)
- {
- /* Give builtins a place to jump back to on failure,
- so we don't go back up to main(). */
- result = setjmp_nosigs (top_level);
-
- /* Give the return builtin a place to jump to when executed in a subshell
- or pipeline */
- funcvalue = 0;
- if (return_catch_flag && builtin == return_builtin)
- funcvalue = setjmp_nosigs (return_catch);
-
- if (result == EXITPROG)
- exit (last_command_exit_value);
- else if (result)
- exit (EXECUTION_FAILURE);
- else if (funcvalue)
- exit (return_catch_value);
- else
- {
- r = execute_builtin (builtin, words, flags, 1);
- fflush (stdout);
- if (r == EX_USAGE)
- r = EX_BADUSAGE;
- exit (r);
- }
- }
- else
- {
- r = execute_function (var, words, flags, fds_to_close, async, 1);
- fflush (stdout);
- exit (r);
- }
-}
-
-/* Execute a builtin or function in the current shell context. If BUILTIN
- is non-null, it is the builtin command to execute, otherwise VAR points
- to the body of a function. WORDS are the command's arguments, REDIRECTS
- are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of
- file descriptors to close.
-
- If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are
- not undone before this function returns. */
-static int
-execute_builtin_or_function (words, builtin, var, redirects,
- fds_to_close, flags)
- WORD_LIST *words;
- sh_builtin_func_t *builtin;
- SHELL_VAR *var;
- REDIRECT *redirects;
- struct fd_bitmap *fds_to_close;
- int flags;
-{
- int result;
- REDIRECT *saved_undo_list;
-#if defined (PROCESS_SUBSTITUTION)
- int ofifo, nfifo, osize;
- char *ofifo_list;
-#endif
-
-#if defined (PROCESS_SUBSTITUTION)
- ofifo = num_fifos ();
- ofifo_list = copy_fifo_list (&osize);
-#endif
-
- if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0)
- {
- cleanup_redirects (redirection_undo_list);
- redirection_undo_list = (REDIRECT *)NULL;
- dispose_exec_redirects ();
-#if defined (PROCESS_SUBSTITUTION)
- free (ofifo_list);
-#endif
- return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */
- }
-
- saved_undo_list = redirection_undo_list;
-
- /* Calling the "exec" builtin changes redirections forever. */
- if (builtin == exec_builtin)
- {
- dispose_redirects (saved_undo_list);
- saved_undo_list = exec_redirection_undo_list;
- exec_redirection_undo_list = (REDIRECT *)NULL;
- }
- else
- dispose_exec_redirects ();
-
- if (saved_undo_list)
- {
- begin_unwind_frame ("saved-redirects");
- add_unwind_protect (cleanup_redirects, (char *)saved_undo_list);
- }
-
- redirection_undo_list = (REDIRECT *)NULL;
-
- if (builtin)
- result = execute_builtin (builtin, words, flags, 0);
- else
- result = execute_function (var, words, flags, fds_to_close, 0, 0);
-
- /* We do this before undoing the effects of any redirections. */
- fflush (stdout);
- fpurge (stdout);
- if (ferror (stdout))
- clearerr (stdout);
-
- /* If we are executing the `command' builtin, but this_shell_builtin is
- set to `exec_builtin', we know that we have something like
- `command exec [redirection]', since otherwise `exec' would have
- overwritten the shell and we wouldn't get here. In this case, we
- want to behave as if the `command' builtin had not been specified
- and preserve the redirections. */
- if (builtin == command_builtin && this_shell_builtin == exec_builtin)
- {
- int discard;
-
- discard = 0;
- if (saved_undo_list)
- {
- dispose_redirects (saved_undo_list);
- discard = 1;
- }
- redirection_undo_list = exec_redirection_undo_list;
- saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL;
- if (discard)
- discard_unwind_frame ("saved-redirects");
- }
-
- if (saved_undo_list)
- {
- redirection_undo_list = saved_undo_list;
- discard_unwind_frame ("saved-redirects");
- }
-
- if (redirection_undo_list)
- {
- cleanup_redirects (redirection_undo_list);
- redirection_undo_list = (REDIRECT *)NULL;
- }
-
-#if defined (PROCESS_SUBSTITUTION)
- /* Close any FIFOs created by this builtin or function. */
- nfifo = num_fifos ();
- if (nfifo > ofifo)
- close_new_fifos (ofifo_list, osize);
- free (ofifo_list);
-#endif
-
- return (result);
-}
-
-void
-setup_async_signals ()
-{
-#if defined (__BEOS__)
- set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */
-#endif
-
-#if defined (JOB_CONTROL)
- if (job_control == 0)
-#endif
- {
- /* Make sure we get the original signal dispositions now so we don't
- confuse the trap builtin later if the subshell tries to use it to
- reset SIGINT/SIGQUIT. Don't call set_signal_ignored; that sets
- the value of original_signals to SIG_IGN. Posix interpretation 751. */
- get_original_signal (SIGINT);
- set_signal_handler (SIGINT, SIG_IGN);
-
- get_original_signal (SIGQUIT);
- set_signal_handler (SIGQUIT, SIG_IGN);
- }
-}
-
-/* Execute a simple command that is hopefully defined in a disk file
- somewhere.
-
- 1) fork ()
- 2) connect pipes
- 3) look up the command
- 4) do redirections
- 5) execve ()
- 6) If the execve failed, see if the file has executable mode set.
- If so, and it isn't a directory, then execute its contents as
- a shell script.
-
- Note that the filename hashing stuff has to take place up here,
- in the parent. This is probably why the Bourne style shells
- don't handle it, since that would require them to go through
- this gnarly hair, for no good reason.
-
- NOTE: callers expect this to fork or exit(). */
-
-/* Name of a shell function to call when a command name is not found. */
-#ifndef NOTFOUND_HOOK
-# define NOTFOUND_HOOK "command_not_found_handle"
-#endif
-
-static int
-execute_disk_command (words, redirects, command_line, pipe_in, pipe_out,
- async, fds_to_close, cmdflags)
- WORD_LIST *words;
- REDIRECT *redirects;
- char *command_line;
- int pipe_in, pipe_out, async;
- struct fd_bitmap *fds_to_close;
- int cmdflags;
-{
- char *pathname, *command, **args;
- int nofork, result;
- pid_t pid;
- SHELL_VAR *hookf;
- WORD_LIST *wl;
-
- nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */
- pathname = words->word->word;
-
- result = EXECUTION_SUCCESS;
-#if defined (RESTRICTED_SHELL)
- command = (char *)NULL;
- if (restricted && mbschr (pathname, '/'))
- {
- internal_error (_("%s: restricted: cannot specify `/' in command names"),
- pathname);
- result = last_command_exit_value = EXECUTION_FAILURE;
-
- /* If we're not going to fork below, we must already be in a child
- process or a context in which it's safe to call exit(2). */
- if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE)
- exit (last_command_exit_value);
- else
- goto parent_return;
- }
-#endif /* RESTRICTED_SHELL */
-
- command = search_for_command (pathname, 1);
-
- if (command)
- {
- maybe_make_export_env ();
- put_command_name_into_env (command);
- }
-
- /* We have to make the child before we check for the non-existence
- of COMMAND, since we want the error messages to be redirected. */
- /* If we can get away without forking and there are no pipes to deal with,
- don't bother to fork, just directly exec the command. */
- if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE)
- pid = 0;
- else
- pid = make_child (savestring (command_line), async);
-
- if (pid == 0)
- {
- int old_interactive;
-
- reset_terminating_signals (); /* XXX */
- /* Cancel traps, in trap.c. */
- restore_original_signals ();
-
- CHECK_SIGTERM;
-
- /* restore_original_signals may have undone the work done
- by make_child to ensure that SIGINT and SIGQUIT are ignored
- in asynchronous children. */
- if (async)
- {
- if ((cmdflags & CMD_STDIN_REDIR) &&
- pipe_in == NO_PIPE &&
- (stdin_redirects (redirects) == 0))
- async_redirect_stdin ();
- setup_async_signals ();
- }
-
- /* This functionality is now provided by close-on-exec of the
- file descriptors manipulated by redirection and piping.
- Some file descriptors still need to be closed in all children
- because of the way bash does pipes; fds_to_close is a
- bitmap of all such file descriptors. */
- if (fds_to_close)
- close_fd_bitmap (fds_to_close);
-
- do_piping (pipe_in, pipe_out);
-
- old_interactive = interactive;
- if (async)
- interactive = 0;
-
- subshell_environment = SUBSHELL_FORK; /* XXX */
-
- if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0))
- {
-#if defined (PROCESS_SUBSTITUTION)
- /* Try to remove named pipes that may have been created as the
- result of redirections. */
- unlink_fifo_list ();
-#endif /* PROCESS_SUBSTITUTION */
- exit (EXECUTION_FAILURE);
- }
-
- if (async)
- interactive = old_interactive;
-
- if (command == 0)
- {
- hookf = find_function (NOTFOUND_HOOK);
- if (hookf == 0)
- {
- /* Make sure filenames are displayed using printable characters */
- if (ansic_shouldquote (pathname))
- pathname = ansic_quote (pathname, 0, NULL);
- internal_error (_("%s: command not found"), pathname);
- exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */
- }
-
-#if defined (JOB_CONTROL)
- /* May need to reinitialize more of the job control state here. */
- kill_current_pipeline ();
-#endif
-
- wl = make_word_list (make_word (NOTFOUND_HOOK), words);
- exit (execute_shell_function (hookf, wl));
- }
-
- CHECK_SIGTERM;
-
- /* Execve expects the command name to be in args[0]. So we
- leave it there, in the same format that the user used to
- type it in. */
- args = strvec_from_word_list (words, 0, 0, (int *)NULL);
- exit (shell_execve (command, args, export_env));
- }
- else
- {
-parent_return:
- QUIT;
-
- /* Make sure that the pipes are closed in the parent. */
- close_pipes (pipe_in, pipe_out);
-#if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD)
- if (variable_context == 0)
- unlink_fifo_list ();
-#endif
- FREE (command);
- return (result);
- }
-}
-
-/* CPP defines to decide whether a particular index into the #! line
- corresponds to a valid interpreter name or argument character, or
- whitespace. The MSDOS define is to allow \r to be treated the same
- as \n. */
-
-#if !defined (MSDOS)
-# define STRINGCHAR(ind) \
- (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n')
-# define WHITECHAR(ind) \
- (ind < sample_len && whitespace (sample[ind]))
-#else /* MSDOS */
-# define STRINGCHAR(ind) \
- (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r')
-# define WHITECHAR(ind) \
- (ind < sample_len && whitespace (sample[ind]))
-#endif /* MSDOS */
-
-static char *
-getinterp (sample, sample_len, endp)
- char *sample;
- int sample_len, *endp;
-{
- register int i;
- char *execname;
- int start;
-
- /* Find the name of the interpreter to exec. */
- for (i = 2; i < sample_len && whitespace (sample[i]); i++)
- ;
-
- for (start = i; STRINGCHAR(i); i++)
- ;
-
- execname = substring (sample, start, i);
-
- if (endp)
- *endp = i;
- return execname;
-}
-
-#if !defined (HAVE_HASH_BANG_EXEC)
-/* If the operating system on which we're running does not handle
- the #! executable format, then help out. SAMPLE is the text read
- from the file, SAMPLE_LEN characters. COMMAND is the name of
- the script; it and ARGS, the arguments given by the user, will
- become arguments to the specified interpreter. ENV is the environment
- to pass to the interpreter.
-
- The word immediately following the #! is the interpreter to execute.
- A single argument to the interpreter is allowed. */
-
-static int
-execute_shell_script (sample, sample_len, command, args, env)
- char *sample;
- int sample_len;
- char *command;
- char **args, **env;
-{
- char *execname, *firstarg;
- int i, start, size_increment, larry;
-
- /* Find the name of the interpreter to exec. */
- execname = getinterp (sample, sample_len, &i);
- size_increment = 1;
-
- /* Now the argument, if any. */
- for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++)
- ;
-
- /* If there is more text on the line, then it is an argument for the
- interpreter. */
-
- if (STRINGCHAR(i))
- {
- for (start = i; STRINGCHAR(i); i++)
- ;
- firstarg = substring ((char *)sample, start, i);
- size_increment = 2;
- }
-
- larry = strvec_len (args) + size_increment;
- args = strvec_resize (args, larry + 1);
-
- for (i = larry - 1; i; i--)
- args[i] = args[i - size_increment];
-
- args[0] = execname;
- if (firstarg)
- {
- args[1] = firstarg;
- args[2] = command;
- }
- else
- args[1] = command;
-
- args[larry] = (char *)NULL;
-
- return (shell_execve (execname, args, env));
-}
-#undef STRINGCHAR
-#undef WHITECHAR
-
-#endif /* !HAVE_HASH_BANG_EXEC */
-
-static void
-initialize_subshell ()
-{
-#if defined (ALIAS)
- /* Forget about any aliases that we knew of. We are in a subshell. */
- delete_all_aliases ();
-#endif /* ALIAS */
-
-#if defined (HISTORY)
- /* Forget about the history lines we have read. This is a non-interactive
- subshell. */
- history_lines_this_session = 0;
-#endif
-
-#if defined (JOB_CONTROL)
- /* Forget about the way job control was working. We are in a subshell. */
- without_job_control ();
- set_sigchld_handler ();
- init_job_stats ();
-#endif /* JOB_CONTROL */
-
- /* Reset the values of the shell flags and options. */
- reset_shell_flags ();
- reset_shell_options ();
- reset_shopt_options ();
-
- /* Zero out builtin_env, since this could be a shell script run from a
- sourced file with a temporary environment supplied to the `source/.'
- builtin. Such variables are not supposed to be exported (empirical
- testing with sh and ksh). Just throw it away; don't worry about a
- memory leak. */
- if (vc_isbltnenv (shell_variables))
- shell_variables = shell_variables->down;
-
- clear_unwind_protect_list (0);
- /* XXX -- are there other things we should be resetting here? */
- parse_and_execute_level = 0; /* nothing left to restore it */
-
- /* We're no longer inside a shell function. */
- variable_context = return_catch_flag = funcnest = evalnest = 0;
-
- executing_list = 0; /* XXX */
-
- /* If we're not interactive, close the file descriptor from which we're
- reading the current shell script. */
- if (interactive_shell == 0)
- unset_bash_input (0);
-}
-
-#if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE)
-# define SETOSTYPE(x) __setostype(x)
-#else
-# define SETOSTYPE(x)
-#endif
-
-#define READ_SAMPLE_BUF(file, buf, len) \
- do \
- { \
- fd = open(file, O_RDONLY); \
- if (fd >= 0) \
- { \
- len = read (fd, buf, 80); \
- close (fd); \
- } \
- else \
- len = -1; \
- } \
- while (0)
-
-/* Call execve (), handling interpreting shell scripts, and handling
- exec failures. */
-int
-shell_execve (command, args, env)
- char *command;
- char **args, **env;
-{
- int larray, i, fd;
- char sample[80];
- int sample_len;
-
- SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */
- execve (command, args, env);
- i = errno; /* error from execve() */
- CHECK_TERMSIG;
- SETOSTYPE (1);
-
- /* If we get to this point, then start checking out the file.
- Maybe it is something we can hack ourselves. */
- if (i != ENOEXEC)
- {
- /* make sure this is set correctly for file_error/report_error */
- last_command_exit_value = (i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC; /* XXX Posix.2 says that exit status is 126 */
- if (file_isdir (command))
-#if defined (EISDIR)
- internal_error (_("%s: %s"), command, strerror (EISDIR));
-#else
- internal_error (_("%s: is a directory"), command);
-#endif
- else if (executable_file (command) == 0)
- {
- errno = i;
- file_error (command);
- }
- /* errors not involving the path argument to execve. */
- else if (i == E2BIG || i == ENOMEM)
- {
- errno = i;
- file_error (command);
- }
- else
- {
- /* The file has the execute bits set, but the kernel refuses to
- run it for some reason. See why. */
-#if defined (HAVE_HASH_BANG_EXEC)
- READ_SAMPLE_BUF (command, sample, sample_len);
- sample[sample_len - 1] = '\0';
- if (sample_len > 2 && sample[0] == '#' && sample[1] == '!')
- {
- char *interp;
- int ilen;
-
- interp = getinterp (sample, sample_len, (int *)NULL);
- ilen = strlen (interp);
- errno = i;
- if (interp[ilen - 1] == '\r')
- {
- interp = xrealloc (interp, ilen + 2);
- interp[ilen - 1] = '^';
- interp[ilen] = 'M';
- interp[ilen + 1] = '\0';
- }
- sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : "");
- FREE (interp);
- return (EX_NOEXEC);
- }
-#endif
- errno = i;
- file_error (command);
- }
- return (last_command_exit_value);
- }
-
- /* This file is executable.
- If it begins with #!, then help out people with losing operating
- systems. Otherwise, check to see if it is a binary file by seeing
- if the contents of the first line (or up to 80 characters) are in the
- ASCII set. If it's a text file, execute the contents as shell commands,
- otherwise return 126 (EX_BINARY_FILE). */
- READ_SAMPLE_BUF (command, sample, sample_len);
-
- if (sample_len == 0)
- return (EXECUTION_SUCCESS);
-
- /* Is this supposed to be an executable script?
- If so, the format of the line is "#! interpreter [argument]".
- A single argument is allowed. The BSD kernel restricts
- the length of the entire line to 32 characters (32 bytes
- being the size of the BSD exec header), but we allow 80
- characters. */
- if (sample_len > 0)
- {
-#if !defined (HAVE_HASH_BANG_EXEC)
- if (sample_len > 2 && sample[0] == '#' && sample[1] == '!')
- return (execute_shell_script (sample, sample_len, command, args, env));
- else
-#endif
- if (check_binary_file (sample, sample_len))
- {
- internal_error (_("%s: cannot execute binary file: %s"), command, strerror (i));
- return (EX_BINARY_FILE);
- }
- }
-
- /* We have committed to attempting to execute the contents of this file
- as shell commands. */
-
- initialize_subshell ();
-
- set_sigint_handler ();
-
- /* Insert the name of this shell into the argument list. */
- larray = strvec_len (args) + 1;
- args = strvec_resize (args, larray + 1);
-
- for (i = larray - 1; i; i--)
- args[i] = args[i - 1];
-
- args[0] = shell_name;
- args[1] = command;
- args[larray] = (char *)NULL;
-
- if (args[0][0] == '-')
- args[0]++;
-
-#if defined (RESTRICTED_SHELL)
- if (restricted)
- change_flag ('r', FLAG_OFF);
-#endif
-
- if (subshell_argv)
- {
- /* Can't free subshell_argv[0]; that is shell_name. */
- for (i = 1; i < subshell_argc; i++)
- free (subshell_argv[i]);
- free (subshell_argv);
- }
-
- dispose_command (currently_executing_command); /* XXX */
- currently_executing_command = (COMMAND *)NULL;
-
- subshell_argc = larray;
- subshell_argv = args;
- subshell_envp = env;
-
- unbind_args (); /* remove the positional parameters */
-
- clear_fifo_list (); /* pipe fds are what they are now */
-
- longjmp (subshell_top_level, 1);
- /*NOTREACHED*/
-}
-
-static int
-execute_intern_function (name, funcdef)
- WORD_DESC *name;
- FUNCTION_DEF *funcdef;
-{
- SHELL_VAR *var;
-
- if (check_identifier (name, posixly_correct) == 0)
- {
- if (posixly_correct && interactive_shell == 0)
- {
- last_command_exit_value = EX_BADUSAGE;
- jump_to_top_level (ERREXIT);
- }
- return (EXECUTION_FAILURE);
- }
-
- /* Posix interpretation 383 */
- if (posixly_correct && find_special_builtin (name->word))
- {
- internal_error (_("`%s': is a special builtin"), name->word);
- last_command_exit_value = EX_BADUSAGE;
- jump_to_top_level (interactive_shell ? DISCARD : ERREXIT);
- }
-
- var = find_function (name->word);
- if (var && (readonly_p (var) || noassign_p (var)))
- {
- if (readonly_p (var))
- internal_error (_("%s: readonly function"), var->name);
- return (EXECUTION_FAILURE);
- }
-
-#if defined (DEBUGGER)
- bind_function_def (name->word, funcdef);
-#endif
-
- bind_function (name->word, funcdef->command);
- return (EXECUTION_SUCCESS);
-}
-
-#if defined (INCLUDE_UNUSED)
-#if defined (PROCESS_SUBSTITUTION)
-void
-close_all_files ()
-{
- register int i, fd_table_size;
-
- fd_table_size = getdtablesize ();
- if (fd_table_size > 256) /* clamp to a reasonable value */
- fd_table_size = 256;
-
- for (i = 3; i < fd_table_size; i++)
- close (i);
-}
-#endif /* PROCESS_SUBSTITUTION */
-#endif
-
-static void
-close_pipes (in, out)
- int in, out;
-{
- if (in >= 0)
- close (in);
- if (out >= 0)
- close (out);
-}
-
-static void
-dup_error (oldd, newd)
- int oldd, newd;
-{
- sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd);
-}
-
-/* Redirect input and output to be from and to the specified pipes.
- NO_PIPE and REDIRECT_BOTH are handled correctly. */
-static void
-do_piping (pipe_in, pipe_out)
- int pipe_in, pipe_out;
-{
- if (pipe_in != NO_PIPE)
- {
- if (dup2 (pipe_in, 0) < 0)
- dup_error (pipe_in, 0);
- if (pipe_in > 0)
- close (pipe_in);
-#ifdef __CYGWIN__
- /* Let stdio know the fd may have changed from text to binary mode. */
- freopen (NULL, "r", stdin);
-#endif /* __CYGWIN__ */
- }
- if (pipe_out != NO_PIPE)
- {
- if (pipe_out != REDIRECT_BOTH)
- {
- if (dup2 (pipe_out, 1) < 0)
- dup_error (pipe_out, 1);
- if (pipe_out == 0 || pipe_out > 1)
- close (pipe_out);
- }
- else
- {
- if (dup2 (1, 2) < 0)
- dup_error (1, 2);
- }
-#ifdef __CYGWIN__
- /* Let stdio know the fd may have changed from text to binary mode, and
- make sure to preserve stdout line buffering. */
- freopen (NULL, "w", stdout);
- sh_setlinebuf (stdout);
-#endif /* __CYGWIN__ */
- }
-}
+++ /dev/null
-/* findcmd.c -- Functions to search for commands by name. */
-
-/* Copyright (C) 1997-2012 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "config.h"
-
-#include <stdio.h>
-#include "chartypes.h"
-#include "bashtypes.h"
-#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
-# include <sys/file.h>
-#endif
-#include "filecntl.h"
-#include "posixstat.h"
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-#include <errno.h>
-
-#include "bashansi.h"
-
-#include "memalloc.h"
-#include "shell.h"
-#include "flags.h"
-#include "hashlib.h"
-#include "pathexp.h"
-#include "hashcmd.h"
-#include "findcmd.h" /* matching prototypes and declarations */
-
-#if !defined (errno)
-extern int errno;
-#endif
-
-extern int posixly_correct;
-extern int last_command_exit_value;
-
-/* Static functions defined and used in this file. */
-static char *_find_user_command_internal __P((const char *, int));
-static char *find_user_command_internal __P((const char *, int));
-static char *find_user_command_in_path __P((const char *, char *, int));
-static char *find_in_path_element __P((const char *, char *, int, int, struct stat *));
-static char *find_absolute_program __P((const char *, int));
-
-static char *get_next_path_element __P((char *, int *));
-
-/* The file name which we would try to execute, except that it isn't
- possible to execute it. This is the first file that matches the
- name that we are looking for while we are searching $PATH for a
- suitable one to execute. If we cannot find a suitable executable
- file, then we use this one. */
-static char *file_to_lose_on;
-
-/* Non-zero if we should stat every command found in the hash table to
- make sure it still exists. */
-int check_hashed_filenames = CHECKHASH_DEFAULT;
-
-/* DOT_FOUND_IN_SEARCH becomes non-zero when find_user_command ()
- encounters a `.' as the directory pathname while scanning the
- list of possible pathnames; i.e., if `.' comes before the directory
- containing the file of interest. */
-int dot_found_in_search = 0;
-
-/* Return some flags based on information about this file.
- The EXISTS bit is non-zero if the file is found.
- The EXECABLE bit is non-zero the file is executble.
- Zero is returned if the file is not found. */
-int
-file_status (name)
- const char *name;
-{
- struct stat finfo;
- int r;
-
- /* Determine whether this file exists or not. */
- if (stat (name, &finfo) < 0)
- return (0);
-
- /* If the file is a directory, then it is not "executable" in the
- sense of the shell. */
- if (S_ISDIR (finfo.st_mode))
- return (FS_EXISTS|FS_DIRECTORY);
-
- r = FS_EXISTS;
-
-#if defined (HAVE_EACCESS)
- /* Use eaccess(2) if we have it to take things like ACLs and other
- file access mechanisms into account. eaccess uses the effective
- user and group IDs, not the real ones. We could use sh_eaccess,
- but we don't want any special treatment for /dev/fd. */
- if (eaccess (name, X_OK) == 0)
- r |= FS_EXECABLE;
- if (eaccess (name, R_OK) == 0)
- r |= FS_READABLE;
-
- return r;
-#elif defined (AFS)
- /* We have to use access(2) to determine access because AFS does not
- support Unix file system semantics. This may produce wrong
- answers for non-AFS files when ruid != euid. I hate AFS. */
- if (access (name, X_OK) == 0)
- r |= FS_EXECABLE;
- if (access (name, R_OK) == 0)
- r |= FS_READABLE;
-
- return r;
-#else /* !HAVE_EACCESS && !AFS */
-
- /* Find out if the file is actually executable. By definition, the
- only other criteria is that the file has an execute bit set that
- we can use. The same with whether or not a file is readable. */
-
- /* Root only requires execute permission for any of owner, group or
- others to be able to exec a file, and can read any file. */
- if (current_user.euid == (uid_t)0)
- {
- r |= FS_READABLE;
- if (finfo.st_mode & S_IXUGO)
- r |= FS_EXECABLE;
- return r;
- }
-
- /* If we are the owner of the file, the owner bits apply. */
- if (current_user.euid == finfo.st_uid)
- {
- if (finfo.st_mode & S_IXUSR)
- r |= FS_EXECABLE;
- if (finfo.st_mode & S_IRUSR)
- r |= FS_READABLE;
- }
-
- /* If we are in the owning group, the group permissions apply. */
- else if (group_member (finfo.st_gid))
- {
- if (finfo.st_mode & S_IXGRP)
- r |= FS_EXECABLE;
- if (finfo.st_mode & S_IRGRP)
- r |= FS_READABLE;
- }
-
- /* Else we check whether `others' have permission to execute the file */
- else
- {
- if (finfo.st_mode & S_IXOTH)
- r |= FS_EXECABLE;
- if (finfo.st_mode & S_IROTH)
- r |= FS_READABLE;
- }
-
- return r;
-#endif /* !AFS */
-}
-
-/* Return non-zero if FILE exists and is executable.
- Note that this function is the definition of what an
- executable file is; do not change this unless YOU know
- what an executable file is. */
-int
-executable_file (file)
- const char *file;
-{
- int s;
-
- s = file_status (file);
-#if defined EISDIR
- if (s & FS_DIRECTORY)
- errno = EISDIR; /* let's see if we can improve error messages */
-#endif
- return ((s & FS_EXECABLE) && ((s & FS_DIRECTORY) == 0));
-}
-
-int
-is_directory (file)
- const char *file;
-{
- return (file_status (file) & FS_DIRECTORY);
-}
-
-int
-executable_or_directory (file)
- const char *file;
-{
- int s;
-
- s = file_status (file);
- return ((s & FS_EXECABLE) || (s & FS_DIRECTORY));
-}
-
-/* Locate the executable file referenced by NAME, searching along
- the contents of the shell PATH variable. Return a new string
- which is the full pathname to the file, or NULL if the file
- couldn't be found. If a file is found that isn't executable,
- and that is the only match, then return that. */
-char *
-find_user_command (name)
- const char *name;
-{
- return (find_user_command_internal (name, FS_EXEC_PREFERRED|FS_NODIRS));
-}
-
-/* Locate the file referenced by NAME, searching along the contents
- of the shell PATH variable. Return a new string which is the full
- pathname to the file, or NULL if the file couldn't be found. This
- returns the first readable file found; designed to be used to look
- for shell scripts or files to source. */
-char *
-find_path_file (name)
- const char *name;
-{
- return (find_user_command_internal (name, FS_READABLE));
-}
-
-static char *
-_find_user_command_internal (name, flags)
- const char *name;
- int flags;
-{
- char *path_list, *cmd;
- SHELL_VAR *var;
-
- /* Search for the value of PATH in both the temporary environments and
- in the regular list of variables. */
- if (var = find_variable_tempenv ("PATH")) /* XXX could be array? */
- path_list = value_cell (var);
- else
- path_list = (char *)NULL;
-
- if (path_list == 0 || *path_list == '\0')
- return (savestring (name));
-
- cmd = find_user_command_in_path (name, path_list, flags);
-
- return (cmd);
-}
-
-static char *
-find_user_command_internal (name, flags)
- const char *name;
- int flags;
-{
-#ifdef __WIN32__
- char *res, *dotexe;
-
- dotexe = (char *)xmalloc (strlen (name) + 5);
- strcpy (dotexe, name);
- strcat (dotexe, ".exe");
- res = _find_user_command_internal (dotexe, flags);
- free (dotexe);
- if (res == 0)
- res = _find_user_command_internal (name, flags);
- return res;
-#else
- return (_find_user_command_internal (name, flags));
-#endif
-}
-
-/* Return the next element from PATH_LIST, a colon separated list of
- paths. PATH_INDEX_POINTER is the address of an index into PATH_LIST;
- the index is modified by this function.
- Return the next element of PATH_LIST or NULL if there are no more. */
-static char *
-get_next_path_element (path_list, path_index_pointer)
- char *path_list;
- int *path_index_pointer;
-{
- char *path;
-
- path = extract_colon_unit (path_list, path_index_pointer);
-
- if (path == 0)
- return (path);
-
- if (*path == '\0')
- {
- free (path);
- path = savestring (".");
- }
-
- return (path);
-}
-
-/* Look for PATHNAME in $PATH. Returns either the hashed command
- corresponding to PATHNAME or the first instance of PATHNAME found
- in $PATH. If (FLAGS&1) is non-zero, insert the instance of PATHNAME
- found in $PATH into the command hash table. Returns a newly-allocated
- string. */
-char *
-search_for_command (pathname, flags)
- const char *pathname;
- int flags;
-{
- char *hashed_file, *command;
- int temp_path, st;
- SHELL_VAR *path;
-
- hashed_file = command = (char *)NULL;
-
- /* If PATH is in the temporary environment for this command, don't use the
- hash table to search for the full pathname. */
- path = find_variable_tempenv ("PATH");
- temp_path = path && tempvar_p (path);
- if (temp_path == 0 && path)
- path = (SHELL_VAR *)NULL;
-
- /* Don't waste time trying to find hashed data for a pathname
- that is already completely specified or if we're using a command-
- specific value for PATH. */
- if (path == 0 && absolute_program (pathname) == 0)
- hashed_file = phash_search (pathname);
-
- /* If a command found in the hash table no longer exists, we need to
- look for it in $PATH. Thank you Posix.2. This forces us to stat
- every command found in the hash table. */
-
- if (hashed_file && (posixly_correct || check_hashed_filenames))
- {
- st = file_status (hashed_file);
- if ((st & (FS_EXISTS|FS_EXECABLE)) != (FS_EXISTS|FS_EXECABLE))
- {
- phash_remove (pathname);
- free (hashed_file);
- hashed_file = (char *)NULL;
- }
- }
-
- if (hashed_file)
- command = hashed_file;
- else if (absolute_program (pathname))
- /* A command containing a slash is not looked up in PATH or saved in
- the hash table. */
- command = savestring (pathname);
- else
- {
- /* If $PATH is in the temporary environment, we've already retrieved
- it, so don't bother trying again. */
- if (temp_path)
- {
- command = find_user_command_in_path (pathname, value_cell (path),
- FS_EXEC_PREFERRED|FS_NODIRS);
- }
- else
- command = find_user_command (pathname);
- if (command && hashing_enabled && temp_path == 0 && (flags & 1))
- phash_insert ((char *)pathname, command, dot_found_in_search, 1); /* XXX fix const later */
- }
- return (command);
-}
-
-char *
-user_command_matches (name, flags, state)
- const char *name;
- int flags, state;
-{
- register int i;
- int path_index, name_len;
- char *path_list, *path_element, *match;
- struct stat dotinfo;
- static char **match_list = NULL;
- static int match_list_size = 0;
- static int match_index = 0;
-
- if (state == 0)
- {
- /* Create the list of matches. */
- if (match_list == 0)
- {
- match_list_size = 5;
- match_list = strvec_create (match_list_size);
- }
-
- /* Clear out the old match list. */
- for (i = 0; i < match_list_size; i++)
- match_list[i] = 0;
-
- /* We haven't found any files yet. */
- match_index = 0;
-
- if (absolute_program (name))
- {
- match_list[0] = find_absolute_program (name, flags);
- match_list[1] = (char *)NULL;
- path_list = (char *)NULL;
- }
- else
- {
- name_len = strlen (name);
- file_to_lose_on = (char *)NULL;
- dot_found_in_search = 0;
- if (stat (".", &dotinfo) < 0)
- dotinfo.st_dev = dotinfo.st_ino = 0; /* so same_file won't match */
- path_list = get_string_value ("PATH");
- path_index = 0;
- }
-
- while (path_list && path_list[path_index])
- {
- path_element = get_next_path_element (path_list, &path_index);
-
- if (path_element == 0)
- break;
-
- match = find_in_path_element (name, path_element, flags, name_len, &dotinfo);
-
- free (path_element);
-
- if (match == 0)
- continue;
-
- if (match_index + 1 == match_list_size)
- {
- match_list_size += 10;
- match_list = strvec_resize (match_list, (match_list_size + 1));
- }
-
- match_list[match_index++] = match;
- match_list[match_index] = (char *)NULL;
- FREE (file_to_lose_on);
- file_to_lose_on = (char *)NULL;
- }
-
- /* We haven't returned any strings yet. */
- match_index = 0;
- }
-
- match = match_list[match_index];
-
- if (match)
- match_index++;
-
- return (match);
-}
-
-static char *
-find_absolute_program (name, flags)
- const char *name;
- int flags;
-{
- int st;
-
- st = file_status (name);
-
- /* If the file doesn't exist, quit now. */
- if ((st & FS_EXISTS) == 0)
- return ((char *)NULL);
-
- /* If we only care about whether the file exists or not, return
- this filename. Otherwise, maybe we care about whether this
- file is executable. If it is, and that is what we want, return it. */
- if ((flags & FS_EXISTS) || ((flags & FS_EXEC_ONLY) && (st & FS_EXECABLE)))
- return (savestring (name));
-
- return (NULL);
-}
-
-static char *
-find_in_path_element (name, path, flags, name_len, dotinfop)
- const char *name;
- char *path;
- int flags, name_len;
- struct stat *dotinfop;
-{
- int status;
- char *full_path, *xpath;
-
- xpath = (*path == '~') ? bash_tilde_expand (path, 0) : path;
-
- /* Remember the location of "." in the path, in all its forms
- (as long as they begin with a `.', e.g. `./.') */
- if (dot_found_in_search == 0 && *xpath == '.')
- dot_found_in_search = same_file (".", xpath, dotinfop, (struct stat *)NULL);
-
- full_path = sh_makepath (xpath, name, 0);
-
- status = file_status (full_path);
-
- if (xpath != path)
- free (xpath);
-
- if ((status & FS_EXISTS) == 0)
- {
- free (full_path);
- return ((char *)NULL);
- }
-
- /* The file exists. If the caller simply wants the first file, here it is. */
- if (flags & FS_EXISTS)
- return (full_path);
-
- /* If we have a readable file, and the caller wants a readable file, this
- is it. */
- if ((flags & FS_READABLE) && (status & FS_READABLE))
- return (full_path);
-
- /* If the file is executable, then it satisfies the cases of
- EXEC_ONLY and EXEC_PREFERRED. Return this file unconditionally. */
- if ((status & FS_EXECABLE) && (flags & (FS_EXEC_ONLY|FS_EXEC_PREFERRED)) &&
- (((flags & FS_NODIRS) == 0) || ((status & FS_DIRECTORY) == 0)))
- {
- FREE (file_to_lose_on);
- file_to_lose_on = (char *)NULL;
- return (full_path);
- }
-
- /* The file is not executable, but it does exist. If we prefer
- an executable, then remember this one if it is the first one
- we have found. */
- if ((flags & FS_EXEC_PREFERRED) && file_to_lose_on == 0)
- file_to_lose_on = savestring (full_path);
-
- /* If we want only executable files, or we don't want directories and
- this file is a directory, or we want a readable file and this file
- isn't readable, fail. */
- if ((flags & (FS_EXEC_ONLY|FS_EXEC_PREFERRED)) ||
- ((flags & FS_NODIRS) && (status & FS_DIRECTORY)) ||
- ((flags & FS_READABLE) && (status & FS_READABLE) == 0))
- {
- free (full_path);
- return ((char *)NULL);
- }
- else
- return (full_path);
-}
-
-/* This does the dirty work for find_user_command_internal () and
- user_command_matches ().
- NAME is the name of the file to search for.
- PATH_LIST is a colon separated list of directories to search.
- FLAGS contains bit fields which control the files which are eligible.
- Some values are:
- FS_EXEC_ONLY: The file must be an executable to be found.
- FS_EXEC_PREFERRED: If we can't find an executable, then the
- the first file matching NAME will do.
- FS_EXISTS: The first file found will do.
- FS_NODIRS: Don't find any directories.
-*/
-static char *
-find_user_command_in_path (name, path_list, flags)
- const char *name;
- char *path_list;
- int flags;
-{
- char *full_path, *path;
- int path_index, name_len;
- struct stat dotinfo;
-
- /* We haven't started looking, so we certainly haven't seen
- a `.' as the directory path yet. */
- dot_found_in_search = 0;
-
- if (absolute_program (name))
- {
- full_path = find_absolute_program (name, flags);
- return (full_path);
- }
-
- if (path_list == 0 || *path_list == '\0')
- return (savestring (name)); /* XXX */
-
- file_to_lose_on = (char *)NULL;
- name_len = strlen (name);
- if (stat (".", &dotinfo) < 0)
- dotinfo.st_dev = dotinfo.st_ino = 0;
- path_index = 0;
-
- while (path_list[path_index])
- {
- /* Allow the user to interrupt out of a lengthy path search. */
- QUIT;
-
- path = get_next_path_element (path_list, &path_index);
- if (path == 0)
- break;
-
- /* Side effects: sets dot_found_in_search, possibly sets
- file_to_lose_on. */
- full_path = find_in_path_element (name, path, flags, name_len, &dotinfo);
- free (path);
-
- /* This should really be in find_in_path_element, but there isn't the
- right combination of flags. */
- if (full_path && is_directory (full_path))
- {
- free (full_path);
- continue;
- }
-
- if (full_path)
- {
- FREE (file_to_lose_on);
- return (full_path);
- }
- }
-
- /* We didn't find exactly what the user was looking for. Return
- the contents of FILE_TO_LOSE_ON which is NULL when the search
- required an executable, or non-NULL if a file was found and the
- search would accept a non-executable as a last resort. If the
- caller specified FS_NODIRS, and file_to_lose_on is a directory,
- return NULL. */
- if (file_to_lose_on && (flags & FS_NODIRS) && is_directory (file_to_lose_on))
- {
- free (file_to_lose_on);
- file_to_lose_on = (char *)NULL;
- }
-
- return (file_to_lose_on);
-}
+++ /dev/null
-/* display.c -- readline redisplay facility. */
-
-/* Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
- This file is part of the GNU Readline Library (Readline), a library
- for reading lines of text with interactive input and history editing.
-
- Readline is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Readline is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Readline. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#define READLINE_LIBRARY
-
-#if defined (HAVE_CONFIG_H)
-# include <config.h>
-#endif
-
-#include <sys/types.h>
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif /* HAVE_UNISTD_H */
-
-#include "posixstat.h"
-
-#if defined (HAVE_STDLIB_H)
-# include <stdlib.h>
-#else
-# include "ansi_stdlib.h"
-#endif /* HAVE_STDLIB_H */
-
-#include <stdio.h>
-
-#ifdef __MSDOS__
-# include <pc.h>
-#endif
-
-/* System-specific feature definitions and include files. */
-#include "rldefs.h"
-#include "rlmbutil.h"
-
-/* Termcap library stuff. */
-#include "tcap.h"
-
-/* Some standard library routines. */
-#include "readline.h"
-#include "history.h"
-
-#include "rlprivate.h"
-#include "xmalloc.h"
-
-#if !defined (strchr) && !defined (__STDC__)
-extern char *strchr (), *strrchr ();
-#endif /* !strchr && !__STDC__ */
-
-static void update_line PARAMS((char *, char *, int, int, int, int));
-static void space_to_eol PARAMS((int));
-static void delete_chars PARAMS((int));
-static void insert_some_chars PARAMS((char *, int, int));
-static void open_some_spaces PARAMS((int));
-static void cr PARAMS((void));
-
-/* State of visible and invisible lines. */
-struct line_state
- {
- char *line;
- int *lbreaks;
- int lbsize;
-#if defined (HANDLE_MULTIBYTE)
- int *wrapped_line;
- int wbsize;
-#endif
- };
-
-/* The line display buffers. One is the line currently displayed on
- the screen. The other is the line about to be displayed. */
-static struct line_state line_state_array[2];
-static struct line_state *line_state_visible = &line_state_array[0];
-static struct line_state *line_state_invisible = &line_state_array[1];
-static int line_structures_initialized = 0;
-
-/* Backwards-compatible names. */
-#define inv_lbreaks (line_state_invisible->lbreaks)
-#define inv_lbsize (line_state_invisible->lbsize)
-#define vis_lbreaks (line_state_visible->lbreaks)
-#define vis_lbsize (line_state_visible->lbsize)
-
-#define visible_line (line_state_visible->line)
-#define invisible_line (line_state_invisible->line)
-
-#if defined (HANDLE_MULTIBYTE)
-static int _rl_col_width PARAMS((const char *, int, int, int));
-#else
-# define _rl_col_width(l, s, e, f) (((e) <= (s)) ? 0 : (e) - (s))
-#endif
-
-/* Heuristic used to decide whether it is faster to move from CUR to NEW
- by backing up or outputting a carriage return and moving forward. CUR
- and NEW are either both buffer positions or absolute screen positions. */
-#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
-
-/* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
- buffer index in others. This macro is used when deciding whether the
- current cursor position is in the middle of a prompt string containing
- invisible characters. XXX - might need to take `modmark' into account. */
-#define PROMPT_ENDING_INDEX \
- ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
-
-
-/* **************************************************************** */
-/* */
-/* Display stuff */
-/* */
-/* **************************************************************** */
-
-/* This is the stuff that is hard for me. I never seem to write good
- display routines in C. Let's see how I do this time. */
-
-/* (PWP) Well... Good for a simple line updater, but totally ignores
- the problems of input lines longer than the screen width.
-
- update_line and the code that calls it makes a multiple line,
- automatically wrapping line update. Careful attention needs
- to be paid to the vertical position variables. */
-
-/* Keep two buffers; one which reflects the current contents of the
- screen, and the other to draw what we think the new contents should
- be. Then compare the buffers, and make whatever changes to the
- screen itself that we should. Finally, make the buffer that we
- just drew into be the one which reflects the current contents of the
- screen, and place the cursor where it belongs.
-
- Commands that want to can fix the display themselves, and then let
- this function know that the display has been fixed by setting the
- RL_DISPLAY_FIXED variable. This is good for efficiency. */
-
-/* Application-specific redisplay function. */
-rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
-
-/* Global variables declared here. */
-/* What YOU turn on when you have handled all redisplay yourself. */
-int rl_display_fixed = 0;
-
-int _rl_suppress_redisplay = 0;
-int _rl_want_redisplay = 0;
-
-/* The stuff that gets printed out before the actual text of the line.
- This is usually pointing to rl_prompt. */
-char *rl_display_prompt = (char *)NULL;
-
-/* Pseudo-global variables declared here. */
-
-/* The visible cursor position. If you print some text, adjust this. */
-/* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
- supporting multibyte characters, and an absolute cursor position when
- in such a locale. This is an artifact of the donated multibyte support.
- Care must be taken when modifying its value. */
-int _rl_last_c_pos = 0;
-int _rl_last_v_pos = 0;
-
-static int cpos_adjusted;
-static int cpos_buffer_position;
-static int displaying_prompt_first_line;
-static int prompt_multibyte_chars;
-
-/* Number of lines currently on screen minus 1. */
-int _rl_vis_botlin = 0;
-
-/* Variables used only in this file. */
-/* The last left edge of text that was displayed. This is used when
- doing horizontal scrolling. It shifts in thirds of a screenwidth. */
-static int last_lmargin;
-
-/* A buffer for `modeline' messages. */
-static char *msg_buf = 0;
-static int msg_bufsiz = 0;
-
-/* Non-zero forces the redisplay even if we thought it was unnecessary. */
-static int forced_display;
-
-/* Default and initial buffer size. Can grow. */
-static int line_size = 1024;
-
-/* Variables to keep track of the expanded prompt string, which may
- include invisible characters. */
-
-static char *local_prompt, *local_prompt_prefix;
-static int local_prompt_len;
-static int prompt_visible_length, prompt_prefix_length;
-
-/* The number of invisible characters in the line currently being
- displayed on the screen. */
-static int visible_wrap_offset;
-
-/* The number of invisible characters in the prompt string. Static so it
- can be shared between rl_redisplay and update_line */
-static int wrap_offset;
-
-/* The index of the last invisible character in the prompt string. */
-static int prompt_last_invisible;
-
-/* The length (buffer offset) of the first line of the last (possibly
- multi-line) buffer displayed on the screen. */
-static int visible_first_line_len;
-
-/* Number of invisible characters on the first physical line of the prompt.
- Only valid when the number of physical characters in the prompt exceeds
- (or is equal to) _rl_screenwidth. */
-static int prompt_invis_chars_first_line;
-
-static int prompt_last_screen_line;
-
-static int prompt_physical_chars;
-
-/* set to a non-zero value by rl_redisplay if we are marking modified history
- lines and the current line is so marked. */
-static int modmark;
-
-/* Variables to save and restore prompt and display information. */
-
-/* These are getting numerous enough that it's time to create a struct. */
-
-static char *saved_local_prompt;
-static char *saved_local_prefix;
-static int saved_last_invisible;
-static int saved_visible_length;
-static int saved_prefix_length;
-static int saved_local_length;
-static int saved_invis_chars_first_line;
-static int saved_physical_chars;
-
-/* Return a character indicating the editing mode, for use in the prompt. */
-static int
-prompt_modechar ()
-{
- if (rl_editing_mode == emacs_mode)
- return '@';
- else if (_rl_keymap == vi_insertion_keymap)
- return '+'; /* vi insert mode */
- else
- return ':'; /* vi command mode */
-}
-
-/* Expand the prompt string S and return the number of visible
- characters in *LP, if LP is not null. This is currently more-or-less
- a placeholder for expansion. LIP, if non-null is a place to store the
- index of the last invisible character in the returned string. NIFLP,
- if non-zero, is a place to store the number of invisible characters in
- the first prompt line. The previous are used as byte counts -- indexes
- into a character buffer. */
-
-/* Current implementation:
- \001 (^A) start non-visible characters
- \002 (^B) end non-visible characters
- all characters except \001 and \002 (following a \001) are copied to
- the returned string; all characters except those between \001 and
- \002 are assumed to be `visible'. */
-
-static char *
-expand_prompt (pmt, lp, lip, niflp, vlp)
- char *pmt;
- int *lp, *lip, *niflp, *vlp;
-{
- char *r, *ret, *p, *igstart;
- int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
-
- /* Short-circuit if we can. */
- if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
- {
- if (pmt == rl_prompt && _rl_show_mode_in_prompt)
- {
- l = strlen (pmt);
- r = (char *)xmalloc (l + 2);
- r[0] = prompt_modechar ();
- strcpy (r + 1, pmt);
- }
- else
- r = savestring (pmt);
-
- if (lp)
- *lp = strlen (r);
- if (lip)
- *lip = 0;
- if (niflp)
- *niflp = 0;
- if (vlp)
- *vlp = lp ? *lp : strlen (r);
- return r;
- }
-
- l = strlen (pmt);
- r = ret = (char *)xmalloc (l + 2);
-
- rl = physchars = 0; /* move up here so mode show can set them */
- if (pmt == rl_prompt && _rl_show_mode_in_prompt)
- {
- *r++ = prompt_modechar ();
- rl = physchars = 1;
- }
-
- invfl = 0; /* invisible chars in first line of prompt */
- invflset = 0; /* we only want to set invfl once */
-
- igstart = 0;
- for (ignoring = last = ninvis = 0, p = pmt; p && *p; p++)
- {
- /* This code strips the invisible character string markers
- RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
- if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */
- {
- ignoring = 1;
- igstart = p;
- continue;
- }
- else if (ignoring && *p == RL_PROMPT_END_IGNORE)
- {
- ignoring = 0;
- if (p != (igstart + 1))
- last = r - ret - 1;
- continue;
- }
- else
- {
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- pind = p - pmt;
- ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
- l = ind - pind;
- while (l--)
- *r++ = *p++;
- if (!ignoring)
- {
- /* rl ends up being assigned to prompt_visible_length,
- which is the number of characters in the buffer that
- contribute to characters on the screen, which might
- not be the same as the number of physical characters
- on the screen in the presence of multibyte characters */
- rl += ind - pind;
- physchars += _rl_col_width (pmt, pind, ind, 0);
- }
- else
- ninvis += ind - pind;
- p--; /* compensate for later increment */
- }
- else
-#endif
- {
- *r++ = *p;
- if (!ignoring)
- {
- rl++; /* visible length byte counter */
- physchars++;
- }
- else
- ninvis++; /* invisible chars byte counter */
- }
-
- if (invflset == 0 && rl >= _rl_screenwidth)
- {
- invfl = ninvis;
- invflset = 1;
- }
- }
- }
-
- if (rl < _rl_screenwidth)
- invfl = ninvis;
-
- *r = '\0';
- if (lp)
- *lp = rl;
- if (lip)
- *lip = last;
- if (niflp)
- *niflp = invfl;
- if (vlp)
- *vlp = physchars;
- return ret;
-}
-
-/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
- PMT and return the rest of PMT. */
-char *
-_rl_strip_prompt (pmt)
- char *pmt;
-{
- char *ret;
-
- ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
- return ret;
-}
-
-void
-_rl_reset_prompt ()
-{
- rl_visible_prompt_length = rl_expand_prompt (rl_prompt);
-}
-
-/*
- * Expand the prompt string into the various display components, if
- * necessary.
- *
- * local_prompt = expanded last line of string in rl_display_prompt
- * (portion after the final newline)
- * local_prompt_prefix = portion before last newline of rl_display_prompt,
- * expanded via expand_prompt
- * prompt_visible_length = number of visible characters in local_prompt
- * prompt_prefix_length = number of visible characters in local_prompt_prefix
- *
- * This function is called once per call to readline(). It may also be
- * called arbitrarily to expand the primary prompt.
- *
- * The return value is the number of visible characters on the last line
- * of the (possibly multi-line) prompt.
- */
-int
-rl_expand_prompt (prompt)
- char *prompt;
-{
- char *p, *t;
- int c;
-
- /* Clear out any saved values. */
- FREE (local_prompt);
- FREE (local_prompt_prefix);
-
- local_prompt = local_prompt_prefix = (char *)0;
- local_prompt_len = 0;
- prompt_last_invisible = prompt_invis_chars_first_line = 0;
- prompt_visible_length = prompt_physical_chars = 0;
-
- if (prompt == 0 || *prompt == 0)
- return (0);
-
- p = strrchr (prompt, '\n');
- if (!p)
- {
- /* The prompt is only one logical line, though it might wrap. */
- local_prompt = expand_prompt (prompt, &prompt_visible_length,
- &prompt_last_invisible,
- &prompt_invis_chars_first_line,
- &prompt_physical_chars);
- local_prompt_prefix = (char *)0;
- local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
- return (prompt_visible_length);
- }
- else
- {
- /* The prompt spans multiple lines. */
- t = ++p;
- local_prompt = expand_prompt (p, &prompt_visible_length,
- &prompt_last_invisible,
- &prompt_invis_chars_first_line,
- &prompt_physical_chars);
- c = *t; *t = '\0';
- /* The portion of the prompt string up to and including the
- final newline is now null-terminated. */
- local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
- (int *)NULL,
- (int *)NULL,
- (int *)NULL);
- *t = c;
- local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
- return (prompt_prefix_length);
- }
-}
-
-/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
- arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
- and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
- increased. If the lines have already been allocated, this ensures that
- they can hold at least MINSIZE characters. */
-static void
-init_line_structures (minsize)
- int minsize;
-{
- register int n;
-
- if (invisible_line == 0) /* initialize it */
- {
- if (line_size < minsize)
- line_size = minsize;
- visible_line = (char *)xmalloc (line_size);
- invisible_line = (char *)xmalloc (line_size);
- }
- else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
- {
- line_size *= 2;
- if (line_size < minsize)
- line_size = minsize;
- visible_line = (char *)xrealloc (visible_line, line_size);
- invisible_line = (char *)xrealloc (invisible_line, line_size);
- }
-
- for (n = minsize; n < line_size; n++)
- {
- visible_line[n] = 0;
- invisible_line[n] = 1;
- }
-
- if (vis_lbreaks == 0)
- {
- /* should be enough. */
- inv_lbsize = vis_lbsize = 256;
-
-#if defined (HANDLE_MULTIBYTE)
- line_state_visible->wbsize = vis_lbsize;
- line_state_visible->wrapped_line = (int *)xmalloc (line_state_visible->wbsize * sizeof (int));
-
- line_state_invisible->wbsize = inv_lbsize;
- line_state_invisible->wrapped_line = (int *)xmalloc (line_state_invisible->wbsize * sizeof (int));
-#endif
-
- inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
- vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
- inv_lbreaks[0] = vis_lbreaks[0] = 0;
- }
-
- line_structures_initialized = 1;
-}
-
-/* Basic redisplay algorithm. */
-void
-rl_redisplay ()
-{
- register int in, out, c, linenum, cursor_linenum;
- register char *line;
- int inv_botlin, lb_botlin, lb_linenum, o_cpos;
- int newlines, lpos, temp, n0, num, prompt_lines_estimate;
- char *prompt_this_line;
-#if defined (HANDLE_MULTIBYTE)
- wchar_t wc;
- size_t wc_bytes;
- int wc_width;
- mbstate_t ps;
- int _rl_wrapped_multicolumn = 0;
-#endif
-
- if (_rl_echoing_p == 0)
- return;
-
- /* Block keyboard interrupts because this function manipulates global
- data structures. */
- _rl_block_sigint ();
- RL_SETSTATE (RL_STATE_REDISPLAYING);
-
- if (!rl_display_prompt)
- rl_display_prompt = "";
-
- if (line_structures_initialized == 0)
- {
- init_line_structures (0);
- rl_on_new_line ();
- }
-
- /* Draw the line into the buffer. */
- cpos_buffer_position = -1;
-
- prompt_multibyte_chars = prompt_visible_length - prompt_physical_chars;
-
- line = invisible_line;
- out = inv_botlin = 0;
-
- /* Mark the line as modified or not. We only do this for history
- lines. */
- modmark = 0;
- if (_rl_mark_modified_lines && current_history () && rl_undo_list)
- {
- line[out++] = '*';
- line[out] = '\0';
- modmark = 1;
- }
-
- /* If someone thought that the redisplay was handled, but the currently
- visible line has a different modification state than the one about
- to become visible, then correct the caller's misconception. */
- if (visible_line[0] != invisible_line[0])
- rl_display_fixed = 0;
-
- /* If the prompt to be displayed is the `primary' readline prompt (the
- one passed to readline()), use the values we have already expanded.
- If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
- number of non-visible characters in the prompt string. */
- if (rl_display_prompt == rl_prompt || local_prompt)
- {
- if (local_prompt_prefix && forced_display)
- _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
-
- if (local_prompt_len > 0)
- {
- temp = local_prompt_len + out + 2;
- if (temp >= line_size)
- {
- line_size = (temp + 1024) - (temp % 1024);
- visible_line = (char *)xrealloc (visible_line, line_size);
- line = invisible_line = (char *)xrealloc (invisible_line, line_size);
- }
- strncpy (line + out, local_prompt, local_prompt_len);
- out += local_prompt_len;
- }
- line[out] = '\0';
- wrap_offset = local_prompt_len - prompt_visible_length;
- }
- else
- {
- int pmtlen;
- prompt_this_line = strrchr (rl_display_prompt, '\n');
- if (!prompt_this_line)
- prompt_this_line = rl_display_prompt;
- else
- {
- prompt_this_line++;
- pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
- if (forced_display)
- {
- _rl_output_some_chars (rl_display_prompt, pmtlen);
- /* Make sure we are at column zero even after a newline,
- regardless of the state of terminal output processing. */
- if (pmtlen < 2 || prompt_this_line[-2] != '\r')
- cr ();
- }
- }
-
- prompt_physical_chars = pmtlen = strlen (prompt_this_line);
- temp = pmtlen + out + 2;
- if (temp >= line_size)
- {
- line_size = (temp + 1024) - (temp % 1024);
- visible_line = (char *)xrealloc (visible_line, line_size);
- line = invisible_line = (char *)xrealloc (invisible_line, line_size);
- }
- strncpy (line + out, prompt_this_line, pmtlen);
- out += pmtlen;
- line[out] = '\0';
- wrap_offset = prompt_invis_chars_first_line = 0;
- }
-
-#define CHECK_INV_LBREAKS() \
- do { \
- if (newlines >= (inv_lbsize - 2)) \
- { \
- inv_lbsize *= 2; \
- inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
- } \
- } while (0)
-
-#if defined (HANDLE_MULTIBYTE)
-#define CHECK_LPOS() \
- do { \
- lpos++; \
- if (lpos >= _rl_screenwidth) \
- { \
- if (newlines >= (inv_lbsize - 2)) \
- { \
- inv_lbsize *= 2; \
- inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
- } \
- inv_lbreaks[++newlines] = out; \
- if (newlines >= (line_state_invisible->wbsize - 1)) \
- { \
- line_state_invisible->wbsize *= 2; \
- line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
- } \
- line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn; \
- lpos = 0; \
- } \
- } while (0)
-#else
-#define CHECK_LPOS() \
- do { \
- lpos++; \
- if (lpos >= _rl_screenwidth) \
- { \
- if (newlines >= (inv_lbsize - 2)) \
- { \
- inv_lbsize *= 2; \
- inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
- } \
- inv_lbreaks[++newlines] = out; \
- lpos = 0; \
- } \
- } while (0)
-#endif
-
- /* inv_lbreaks[i] is where line i starts in the buffer. */
- inv_lbreaks[newlines = 0] = 0;
- lpos = prompt_physical_chars + modmark;
-
-#if defined (HANDLE_MULTIBYTE)
- memset (line_state_invisible->wrapped_line, 0, line_state_invisible->wbsize * sizeof (int));
- num = 0;
-#endif
-
- /* prompt_invis_chars_first_line is the number of invisible characters in
- the first physical line of the prompt.
- wrap_offset - prompt_invis_chars_first_line is the number of invis
- chars on the second (or, more generally, last) line. */
-
- /* This is zero-based, used to set the newlines */
- prompt_lines_estimate = lpos / _rl_screenwidth;
-
- /* what if lpos is already >= _rl_screenwidth before we start drawing the
- contents of the command line? */
- while (lpos >= _rl_screenwidth)
- {
- int z;
- /* fix from Darin Johnson <darin@acuson.com> for prompt string with
- invisible characters that is longer than the screen width. The
- prompt_invis_chars_first_line variable could be made into an array
- saying how many invisible characters there are per line, but that's
- probably too much work for the benefit gained. How many people have
- prompts that exceed two physical lines?
- Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0)
- {
- n0 = num;
- temp = local_prompt_len;
- while (num < temp)
- {
- z = _rl_col_width (local_prompt, n0, num, 1);
- if (z > _rl_screenwidth)
- {
- num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
- break;
- }
- else if (z == _rl_screenwidth)
- break;
- num++;
- }
- temp = num;
- }
- else
-#endif /* !HANDLE_MULTIBYTE */
- temp = ((newlines + 1) * _rl_screenwidth);
-
- /* Now account for invisible characters in the current line. */
- /* XXX - this assumes that the invisible characters may be split, but only
- between the first and the last lines. */
- temp += (newlines == 0) ? prompt_invis_chars_first_line
- : ((newlines == prompt_lines_estimate) ? wrap_offset : prompt_invis_chars_first_line);
-
- inv_lbreaks[++newlines] = temp;
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0)
- lpos -= _rl_col_width (local_prompt, n0, num, 1);
- else
-#endif
- lpos -= _rl_screenwidth;
- }
-
- prompt_last_screen_line = newlines;
-
- /* Draw the rest of the line (after the prompt) into invisible_line, keeping
- track of where the cursor is (cpos_buffer_position), the number of the line containing
- the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
- It maintains an array of line breaks for display (inv_lbreaks).
- This handles expanding tabs for display and displaying meta characters. */
- lb_linenum = 0;
-#if defined (HANDLE_MULTIBYTE)
- in = 0;
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- memset (&ps, 0, sizeof (mbstate_t));
- /* XXX - what if wc_bytes ends up <= 0? check for MB_INVALIDCH */
- wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
- }
- else
- wc_bytes = 1;
- while (in < rl_end)
-#else
- for (in = 0; in < rl_end; in++)
-#endif
- {
- c = (unsigned char)rl_line_buffer[in];
-
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- if (MB_INVALIDCH (wc_bytes))
- {
- /* Byte sequence is invalid or shortened. Assume that the
- first byte represents a character. */
- wc_bytes = 1;
- /* Assume that a character occupies a single column. */
- wc_width = 1;
- memset (&ps, 0, sizeof (mbstate_t));
- }
- else if (MB_NULLWCH (wc_bytes))
- break; /* Found '\0' */
- else
- {
- temp = WCWIDTH (wc);
- wc_width = (temp >= 0) ? temp : 1;
- }
- }
-#endif
-
- if (out + 8 >= line_size) /* XXX - 8 for \t */
- {
- line_size *= 2;
- visible_line = (char *)xrealloc (visible_line, line_size);
- invisible_line = (char *)xrealloc (invisible_line, line_size);
- line = invisible_line;
- }
-
- if (in == rl_point)
- {
- cpos_buffer_position = out;
- lb_linenum = newlines;
- }
-
-#if defined (HANDLE_MULTIBYTE)
- if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
-#else
- if (META_CHAR (c))
-#endif
- {
- if (_rl_output_meta_chars == 0)
- {
- sprintf (line + out, "\\%o", c);
-
- if (lpos + 4 >= _rl_screenwidth)
- {
- temp = _rl_screenwidth - lpos;
- CHECK_INV_LBREAKS ();
- inv_lbreaks[++newlines] = out + temp;
- lpos = 4 - temp;
- }
- else
- lpos += 4;
-
- out += 4;
- }
- else
- {
- line[out++] = c;
- CHECK_LPOS();
- }
- }
-#if defined (DISPLAY_TABS)
- else if (c == '\t')
- {
- register int newout;
-
-#if 0
- newout = (out | (int)7) + 1;
-#else
- newout = out + 8 - lpos % 8;
-#endif
- temp = newout - out;
- if (lpos + temp >= _rl_screenwidth)
- {
- register int temp2;
- temp2 = _rl_screenwidth - lpos;
- CHECK_INV_LBREAKS ();
- inv_lbreaks[++newlines] = out + temp2;
- lpos = temp - temp2;
- while (out < newout)
- line[out++] = ' ';
- }
- else
- {
- while (out < newout)
- line[out++] = ' ';
- lpos += temp;
- }
- }
-#endif
- else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
- {
- line[out++] = '\0'; /* XXX - sentinel */
- CHECK_INV_LBREAKS ();
- inv_lbreaks[++newlines] = out;
- lpos = 0;
- }
- else if (CTRL_CHAR (c) || c == RUBOUT)
- {
- line[out++] = '^';
- CHECK_LPOS();
- line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
- CHECK_LPOS();
- }
- else
- {
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- register int i;
-
- _rl_wrapped_multicolumn = 0;
-
- if (_rl_screenwidth < lpos + wc_width)
- for (i = lpos; i < _rl_screenwidth; i++)
- {
- /* The space will be removed in update_line() */
- line[out++] = ' ';
- _rl_wrapped_multicolumn++;
- CHECK_LPOS();
- }
- if (in == rl_point)
- {
- cpos_buffer_position = out;
- lb_linenum = newlines;
- }
- for (i = in; i < in+wc_bytes; i++)
- line[out++] = rl_line_buffer[i];
- for (i = 0; i < wc_width; i++)
- CHECK_LPOS();
- }
- else
- {
- line[out++] = c;
- CHECK_LPOS();
- }
-#else
- line[out++] = c;
- CHECK_LPOS();
-#endif
- }
-
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- in += wc_bytes;
- /* XXX - what if wc_bytes ends up <= 0? check for MB_INVALIDCH */
- wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
- }
- else
- in++;
-#endif
-
- }
- line[out] = '\0';
- if (cpos_buffer_position < 0)
- {
- cpos_buffer_position = out;
- lb_linenum = newlines;
- }
-
- inv_botlin = lb_botlin = newlines;
- CHECK_INV_LBREAKS ();
- inv_lbreaks[newlines+1] = out;
- cursor_linenum = lb_linenum;
-
- /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
- CURSOR_LINENUM == line number where the cursor should be placed. */
-
- /* PWP: now is when things get a bit hairy. The visible and invisible
- line buffers are really multiple lines, which would wrap every
- (screenwidth - 1) characters. Go through each in turn, finding
- the changed region and updating it. The line order is top to bottom. */
-
- /* If we can move the cursor up and down, then use multiple lines,
- otherwise, let long lines display in a single terminal line, and
- horizontally scroll it. */
- displaying_prompt_first_line = 1;
- if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
- {
- int nleft, pos, changed_screen_line, tx;
-
- if (!rl_display_fixed || forced_display)
- {
- forced_display = 0;
-
- /* If we have more than a screenful of material to display, then
- only display a screenful. We should display the last screen,
- not the first. */
- if (out >= _rl_screenchars)
- {
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
- else
- out = _rl_screenchars - 1;
- }
-
- /* The first line is at character position 0 in the buffer. The
- second and subsequent lines start at inv_lbreaks[N], offset by
- OFFSET (which has already been calculated above). */
-
-#define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset)
-#define WRAP_OFFSET(line, offset) ((line == 0) \
- ? (offset ? INVIS_FIRST() : 0) \
- : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0))
-#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
-#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
-#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
-#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
-#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
-#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
-
-#define OLD_CPOS_IN_PROMPT() (cpos_adjusted == 0 && \
- _rl_last_c_pos != o_cpos && \
- _rl_last_c_pos > wrap_offset && \
- o_cpos < prompt_last_invisible)
-
- /* For each line in the buffer, do the updating display. */
- for (linenum = 0; linenum <= inv_botlin; linenum++)
- {
- /* This can lead us astray if we execute a program that changes
- the locale from a non-multibyte to a multibyte one. */
- o_cpos = _rl_last_c_pos;
- cpos_adjusted = 0;
- update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
- VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
-
- /* update_line potentially changes _rl_last_c_pos, but doesn't
- take invisible characters into account, since _rl_last_c_pos
- is an absolute cursor position in a multibyte locale. See
- if compensating here is the right thing, or if we have to
- change update_line itself. There are several cases in which
- update_line adjusts _rl_last_c_pos itself (so it can pass
- _rl_move_cursor_relative accurate values); it communicates
- this back by setting cpos_adjusted. If we assume that
- _rl_last_c_pos is correct (an absolute cursor position) each
- time update_line is called, then we can assume in our
- calculations that o_cpos does not need to be adjusted by
- wrap_offset. */
- if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) && OLD_CPOS_IN_PROMPT())
- _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
- else if (linenum == prompt_last_screen_line && prompt_physical_chars > _rl_screenwidth &&
- (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
- cpos_adjusted == 0 &&
- _rl_last_c_pos != o_cpos &&
- _rl_last_c_pos > (prompt_last_invisible - _rl_screenwidth - prompt_invis_chars_first_line))
- _rl_last_c_pos -= (wrap_offset-prompt_invis_chars_first_line);
-
- /* If this is the line with the prompt, we might need to
- compensate for invisible characters in the new line. Do
- this only if there is not more than one new line (which
- implies that we completely overwrite the old visible line)
- and the new line is shorter than the old. Make sure we are
- at the end of the new line before clearing. */
- if (linenum == 0 &&
- inv_botlin == 0 && _rl_last_c_pos == out &&
- (wrap_offset > visible_wrap_offset) &&
- (_rl_last_c_pos < visible_first_line_len))
- {
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- nleft = _rl_screenwidth - _rl_last_c_pos;
- else
- nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
- if (nleft)
- _rl_clear_to_eol (nleft);
- }
-#if 0
- /* This segment is intended to handle the case where the prompt
- has invisible characters on the second line and the new line
- to be displayed needs to clear the rest of the old characters
- out (e.g., when printing the i-search prompt). In general,
- the case of the new line being shorter than the old.
- Incomplete */
- else if (linenum == prompt_last_screen_line &&
- prompt_physical_chars > _rl_screenwidth &&
- wrap_offset != prompt_invis_chars_first_line &&
- _rl_last_c_pos == out &&
-#endif
-
-
- /* Since the new first line is now visible, save its length. */
- if (linenum == 0)
- visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
- }
-
- /* We may have deleted some lines. If so, clear the left over
- blank ones at the bottom out. */
- if (_rl_vis_botlin > inv_botlin)
- {
- char *tt;
- for (; linenum <= _rl_vis_botlin; linenum++)
- {
- tt = VIS_CHARS (linenum);
- _rl_move_vert (linenum);
- _rl_move_cursor_relative (0, tt);
- _rl_clear_to_eol
- ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
- }
- }
- _rl_vis_botlin = inv_botlin;
-
- /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
- different screen line during this redisplay. */
- changed_screen_line = _rl_last_v_pos != cursor_linenum;
- if (changed_screen_line)
- {
- _rl_move_vert (cursor_linenum);
- /* If we moved up to the line with the prompt using _rl_term_up,
- the physical cursor position on the screen stays the same,
- but the buffer position needs to be adjusted to account
- for invisible characters. */
- if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
- _rl_last_c_pos += wrap_offset;
- }
-
- /* We have to reprint the prompt if it contains invisible
- characters, since it's not generally OK to just reprint
- the characters from the current cursor position. But we
- only need to reprint it if the cursor is before the last
- invisible character in the prompt string. */
- nleft = prompt_visible_length + wrap_offset;
- if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
-#if 0
- _rl_last_c_pos <= PROMPT_ENDING_INDEX && local_prompt)
-#else
- _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt)
-#endif
- {
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- if (_rl_term_cr)
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif
- if (modmark)
- _rl_output_some_chars ("*", 1);
-
- _rl_output_some_chars (local_prompt, nleft);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft, 1) - wrap_offset + modmark;
- else
- _rl_last_c_pos = nleft + modmark;
- }
-
- /* Where on that line? And where does that line start
- in the buffer? */
- pos = inv_lbreaks[cursor_linenum];
- /* nleft == number of characters in the line buffer between the
- start of the line and the desired cursor position. */
- nleft = cpos_buffer_position - pos;
-
- /* NLEFT is now a number of characters in a buffer. When in a
- multibyte locale, however, _rl_last_c_pos is an absolute cursor
- position that doesn't take invisible characters in the prompt
- into account. We use a fudge factor to compensate. */
-
- /* Since _rl_backspace() doesn't know about invisible characters in the
- prompt, and there's no good way to tell it, we compensate for
- those characters here and call _rl_backspace() directly. */
- if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
- {
- /* TX == new physical cursor position in multibyte locale. */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- tx = _rl_col_width (&visible_line[pos], 0, nleft, 1) - visible_wrap_offset;
- else
- tx = nleft;
- if (tx >= 0 && _rl_last_c_pos > tx)
- {
- _rl_backspace (_rl_last_c_pos - tx); /* XXX */
- _rl_last_c_pos = tx;
- }
- }
-
- /* We need to note that in a multibyte locale we are dealing with
- _rl_last_c_pos as an absolute cursor position, but moving to a
- point specified by a buffer position (NLEFT) that doesn't take
- invisible characters into account. */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- _rl_move_cursor_relative (nleft, &invisible_line[pos]);
- else if (nleft != _rl_last_c_pos)
- _rl_move_cursor_relative (nleft, &invisible_line[pos]);
- }
- }
- else /* Do horizontal scrolling. */
- {
-#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
- int lmargin, ndisp, nleft, phys_c_pos, t;
-
- /* Always at top line. */
- _rl_last_v_pos = 0;
-
- /* Compute where in the buffer the displayed line should start. This
- will be LMARGIN. */
-
- /* The number of characters that will be displayed before the cursor. */
- ndisp = cpos_buffer_position - wrap_offset;
- nleft = prompt_visible_length + wrap_offset;
- /* Where the new cursor position will be on the screen. This can be
- longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
- phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset);
- t = _rl_screenwidth / 3;
-
- /* If the number of characters had already exceeded the screenwidth,
- last_lmargin will be > 0. */
-
- /* If the number of characters to be displayed is more than the screen
- width, compute the starting offset so that the cursor is about
- two-thirds of the way across the screen. */
- if (phys_c_pos > _rl_screenwidth - 2)
- {
- lmargin = cpos_buffer_position - (2 * t);
- if (lmargin < 0)
- lmargin = 0;
- /* If the left margin would be in the middle of a prompt with
- invisible characters, don't display the prompt at all. */
- if (wrap_offset && lmargin > 0 && lmargin < nleft)
- lmargin = nleft;
- }
- else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
- lmargin = 0;
- else if (phys_c_pos < 1)
- {
- /* If we are moving back towards the beginning of the line and
- the last margin is no longer correct, compute a new one. */
- lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */
- if (wrap_offset && lmargin > 0 && lmargin < nleft)
- lmargin = nleft;
- }
- else
- lmargin = last_lmargin;
-
- displaying_prompt_first_line = lmargin < nleft;
-
- /* If the first character on the screen isn't the first character
- in the display line, indicate this with a special character. */
- if (lmargin > 0)
- line[lmargin] = '<';
-
- /* If SCREENWIDTH characters starting at LMARGIN do not encompass
- the whole line, indicate that with a special character at the
- right edge of the screen. If LMARGIN is 0, we need to take the
- wrap offset into account. */
- t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
- if (t < out)
- line[t - 1] = '>';
-
- if (rl_display_fixed == 0 || forced_display || lmargin != last_lmargin)
- {
- forced_display = 0;
- o_cpos = _rl_last_c_pos;
- cpos_adjusted = 0;
- update_line (&visible_line[last_lmargin],
- &invisible_line[lmargin],
- 0,
- _rl_screenwidth + visible_wrap_offset,
- _rl_screenwidth + (lmargin ? 0 : wrap_offset),
- 0);
-
- if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
- displaying_prompt_first_line && OLD_CPOS_IN_PROMPT())
- _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
-
- /* If the visible new line is shorter than the old, but the number
- of invisible characters is greater, and we are at the end of
- the new line, we need to clear to eol. */
- t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
- if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
- (_rl_last_c_pos == out) && displaying_prompt_first_line &&
- t < visible_first_line_len)
- {
- nleft = _rl_screenwidth - t;
- _rl_clear_to_eol (nleft);
- }
- visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
- if (visible_first_line_len > _rl_screenwidth)
- visible_first_line_len = _rl_screenwidth;
-
- _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]);
- last_lmargin = lmargin;
- }
- }
- fflush (rl_outstream);
-
- /* Swap visible and non-visible lines. */
- {
- struct line_state *vtemp = line_state_visible;
-
- line_state_visible = line_state_invisible;
- line_state_invisible = vtemp;
-
- rl_display_fixed = 0;
- /* If we are displaying on a single line, and last_lmargin is > 0, we
- are not displaying any invisible characters, so set visible_wrap_offset
- to 0. */
- if (_rl_horizontal_scroll_mode && last_lmargin)
- visible_wrap_offset = 0;
- else
- visible_wrap_offset = wrap_offset;
- }
-
- RL_UNSETSTATE (RL_STATE_REDISPLAYING);
- _rl_release_sigint ();
-}
-
-/* PWP: update_line() is based on finding the middle difference of each
- line on the screen; vis:
-
- /old first difference
- /beginning of line | /old last same /old EOL
- v v v v
-old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
-new: eddie> Oh, my little buggy says to me, as lurgid as
- ^ ^ ^ ^
- \beginning of line | \new last same \new end of line
- \new first difference
-
- All are character pointers for the sake of speed. Special cases for
- no differences, as well as for end of line additions must be handled.
-
- Could be made even smarter, but this works well enough */
-static void
-update_line (old, new, current_line, omax, nmax, inv_botlin)
- register char *old, *new;
- int current_line, omax, nmax, inv_botlin;
-{
- register char *ofd, *ols, *oe, *nfd, *nls, *ne;
- int temp, lendiff, wsatend, od, nd, twidth, o_cpos;
- int current_invis_chars;
- int col_lendiff, col_temp;
- int bytes_to_insert;
-#if defined (HANDLE_MULTIBYTE)
- mbstate_t ps_new, ps_old;
- int new_offset, old_offset;
-#endif
-
- /* If we're at the right edge of a terminal that supports xn, we're
- ready to wrap around, so do so. This fixes problems with knowing
- the exact cursor position and cut-and-paste with certain terminal
- emulators. In this calculation, TEMP is the physical screen
- position of the cursor. */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- temp = _rl_last_c_pos;
- else
- temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset);
- if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
- && _rl_last_v_pos == current_line - 1)
- {
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- wchar_t wc;
- mbstate_t ps;
- int tempwidth, bytes;
- size_t ret;
-
- /* This fixes only double-column characters, but if the wrapped
- character consumes more than three columns, spaces will be
- inserted in the string buffer. */
- if (current_line < line_state_visible->wbsize && line_state_visible->wrapped_line[current_line] > 0)
- _rl_clear_to_eol (line_state_visible->wrapped_line[current_line]);
-
- memset (&ps, 0, sizeof (mbstate_t));
- ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
- if (MB_INVALIDCH (ret))
- {
- tempwidth = 1;
- ret = 1;
- }
- else if (MB_NULLWCH (ret))
- tempwidth = 0;
- else
- tempwidth = WCWIDTH (wc);
-
- if (tempwidth > 0)
- {
- int count, i;
- bytes = ret;
- for (count = 0; count < bytes; count++)
- putc (new[count], rl_outstream);
- _rl_last_c_pos = tempwidth;
- _rl_last_v_pos++;
- memset (&ps, 0, sizeof (mbstate_t));
- ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
- if (ret != 0 && bytes != 0)
- {
- if (MB_INVALIDCH (ret))
- ret = 1;
- memmove (old+bytes, old+ret, strlen (old+ret));
- memcpy (old, new, bytes);
- /* Fix up indices if we copy data from one line to another */
- omax += bytes - ret;
- for (i = current_line+1; i <= inv_botlin+1; i++)
- vis_lbreaks[i] += bytes - ret;
- }
- }
- else
- {
- putc (' ', rl_outstream);
- _rl_last_c_pos = 1;
- _rl_last_v_pos++;
- if (old[0] && new[0])
- old[0] = new[0];
- }
- }
- else
-#endif
- {
- if (new[0])
- putc (new[0], rl_outstream);
- else
- putc (' ', rl_outstream);
- _rl_last_c_pos = 1;
- _rl_last_v_pos++;
- if (old[0] && new[0])
- old[0] = new[0];
- }
- }
-
-
- /* Find first difference. */
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- /* See if the old line is a subset of the new line, so that the
- only change is adding characters. */
- temp = (omax < nmax) ? omax : nmax;
- if (memcmp (old, new, temp) == 0) /* adding at the end */
- {
- new_offset = old_offset = temp;
- ofd = old + temp;
- nfd = new + temp;
- }
- else
- {
- memset (&ps_new, 0, sizeof(mbstate_t));
- memset (&ps_old, 0, sizeof(mbstate_t));
-
- if (omax == nmax && STREQN (new, old, omax))
- {
- old_offset = omax;
- new_offset = nmax;
- ofd = old + omax;
- nfd = new + nmax;
- }
- else
- {
- new_offset = old_offset = 0;
- for (ofd = old, nfd = new;
- (ofd - old < omax) && *ofd &&
- _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
- {
- old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
- new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
-
- ofd = old + old_offset;
- nfd = new + new_offset;
- }
- }
- }
- }
- else
-#endif
- for (ofd = old, nfd = new;
- (ofd - old < omax) && *ofd && (*ofd == *nfd);
- ofd++, nfd++)
- ;
-
- /* Move to the end of the screen line. ND and OD are used to keep track
- of the distance between ne and new and oe and old, respectively, to
- move a subtraction out of each loop. */
- for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
- for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
-
- /* If no difference, continue to next line. */
- if (ofd == oe && nfd == ne)
- return;
-
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && _rl_utf8locale)
- {
- wchar_t wc;
- mbstate_t ps = { 0 };
- int t;
-
- /* If the first character in the difference is a zero-width character,
- assume it's a combining character and back one up so the two base
- characters no longer compare equivalently. */
- t = mbrtowc (&wc, ofd, MB_CUR_MAX, &ps);
- if (t > 0 && UNICODE_COMBINING_CHAR (wc) && WCWIDTH (wc) == 0)
- {
- old_offset = _rl_find_prev_mbchar (old, ofd - old, MB_FIND_ANY);
- new_offset = _rl_find_prev_mbchar (new, nfd - new, MB_FIND_ANY);
- ofd = old + old_offset; /* equal by definition */
- nfd = new + new_offset;
- }
- }
-#endif
-
- wsatend = 1; /* flag for trailing whitespace */
-
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
- nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
-
- while ((ols > ofd) && (nls > nfd))
- {
- memset (&ps_old, 0, sizeof (mbstate_t));
- memset (&ps_new, 0, sizeof (mbstate_t));
-
-#if 0
- /* On advice from jir@yamato.ibm.com */
- _rl_adjust_point (old, ols - old, &ps_old);
- _rl_adjust_point (new, nls - new, &ps_new);
-#endif
-
- if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
- break;
-
- if (*ols == ' ')
- wsatend = 0;
-
- ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
- nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
- }
- }
- else
- {
-#endif /* HANDLE_MULTIBYTE */
- ols = oe - 1; /* find last same */
- nls = ne - 1;
- while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
- {
- if (*ols != ' ')
- wsatend = 0;
- ols--;
- nls--;
- }
-#if defined (HANDLE_MULTIBYTE)
- }
-#endif
-
- if (wsatend)
- {
- ols = oe;
- nls = ne;
- }
-#if defined (HANDLE_MULTIBYTE)
- /* This may not work for stateful encoding, but who cares? To handle
- stateful encoding properly, we have to scan each string from the
- beginning and compare. */
- else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
-#else
- else if (*ols != *nls)
-#endif
- {
- if (*ols) /* don't step past the NUL */
- {
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
- else
- ols++;
- }
- if (*nls)
- {
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
- else
- nls++;
- }
- }
-
- /* count of invisible characters in the current invisible line. */
- current_invis_chars = W_OFFSET (current_line, wrap_offset);
- if (_rl_last_v_pos != current_line)
- {
- _rl_move_vert (current_line);
- if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
- _rl_last_c_pos += visible_wrap_offset;
- }
-
- /* If this is the first line and there are invisible characters in the
- prompt string, and the prompt string has not changed, and the current
- cursor position is before the last invisible character in the prompt,
- and the index of the character to move to is past the end of the prompt
- string, then redraw the entire prompt string. We can only do this
- reliably if the terminal supports a `cr' capability.
-
- This is not an efficiency hack -- there is a problem with redrawing
- portions of the prompt string if they contain terminal escape
- sequences (like drawing the `unbold' sequence without a corresponding
- `bold') that manifests itself on certain terminals. */
-
- lendiff = local_prompt_len;
- od = ofd - old; /* index of first difference in visible line */
- if (current_line == 0 && !_rl_horizontal_scroll_mode &&
- _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
- od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX)
- {
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif
- if (modmark)
- _rl_output_some_chars ("*", 1);
- _rl_output_some_chars (local_prompt, lendiff);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- /* We take wrap_offset into account here so we can pass correct
- information to _rl_move_cursor_relative. */
- _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff, 1) - wrap_offset + modmark;
- cpos_adjusted = 1;
- }
- else
- _rl_last_c_pos = lendiff + modmark;
- }
-
- o_cpos = _rl_last_c_pos;
-
- /* When this function returns, _rl_last_c_pos is correct, and an absolute
- cursor position in multibyte mode, but a buffer index when not in a
- multibyte locale. */
- _rl_move_cursor_relative (od, old);
-
-#if defined (HANDLE_MULTIBYTE)
- /* We need to indicate that the cursor position is correct in the presence of
- invisible characters in the prompt string. Let's see if setting this when
- we make sure we're at the end of the drawn prompt string works. */
- if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 &&
- (_rl_last_c_pos > 0 || o_cpos > 0) &&
- _rl_last_c_pos == prompt_physical_chars)
- cpos_adjusted = 1;
-#endif
-
- /* if (len (new) > len (old))
- lendiff == difference in buffer (bytes)
- col_lendiff == difference on screen (columns)
- When not using multibyte characters, these are equal */
- lendiff = (nls - nfd) - (ols - ofd);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- col_lendiff = _rl_col_width (new, nfd - new, nls - new, 1) - _rl_col_width (old, ofd - old, ols - old, 1);
- else
- col_lendiff = lendiff;
-
- /* If we are changing the number of invisible characters in a line, and
- the spot of first difference is before the end of the invisible chars,
- lendiff needs to be adjusted. */
- if (current_line == 0 && /* !_rl_horizontal_scroll_mode && */
- current_invis_chars != visible_wrap_offset)
- {
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- lendiff += visible_wrap_offset - current_invis_chars;
- col_lendiff += visible_wrap_offset - current_invis_chars;
- }
- else
- {
- lendiff += visible_wrap_offset - current_invis_chars;
- col_lendiff = lendiff;
- }
- }
-
- /* We use temp as a count of the number of bytes from the first difference
- to the end of the new line. col_temp is the corresponding number of
- screen columns. A `dumb' update moves to the spot of first difference
- and writes TEMP bytes. */
- /* Insert (diff (len (old), len (new)) ch. */
- temp = ne - nfd;
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- col_temp = _rl_col_width (new, nfd - new, ne - new, 1);
- else
- col_temp = temp;
-
- /* how many bytes from the new line buffer to write to the display */
- bytes_to_insert = nls - nfd;
-
- /* col_lendiff > 0 if we are adding characters to the line */
- if (col_lendiff > 0) /* XXX - was lendiff */
- {
- /* Non-zero if we're increasing the number of lines. */
- int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
- /* If col_lendiff is > 0, implying that the new string takes up more
- screen real estate than the old, but lendiff is < 0, meaning that it
- takes fewer bytes, we need to just output the characters starting
- from the first difference. These will overwrite what is on the
- display, so there's no reason to do a smart update. This can really
- only happen in a multibyte environment. */
- if (lendiff < 0)
- {
- _rl_output_some_chars (nfd, temp);
- _rl_last_c_pos += col_temp; /* XXX - was _rl_col_width (nfd, 0, temp, 1); */
- /* If nfd begins before any invisible characters in the prompt,
- adjust _rl_last_c_pos to account for wrap_offset and set
- cpos_adjusted to let the caller know. */
- if (current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
- {
- _rl_last_c_pos -= wrap_offset;
- cpos_adjusted = 1;
- }
- return;
- }
- /* Sometimes it is cheaper to print the characters rather than
- use the terminal's capabilities. If we're growing the number
- of lines, make sure we actually cause the new line to wrap
- around on auto-wrapping terminals. */
- else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
- {
- /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
- _rl_horizontal_scroll_mode == 1, inserting the characters with
- _rl_term_IC or _rl_term_ic will screw up the screen because of the
- invisible characters. We need to just draw them. */
- /* The same thing happens if we're trying to draw before the last
- invisible character in the prompt string or we're increasing the
- number of invisible characters in the line and we're not drawing
- the entire prompt string. */
- if (*ols && ((_rl_horizontal_scroll_mode &&
- _rl_last_c_pos == 0 &&
- lendiff > prompt_visible_length &&
- current_invis_chars > 0) == 0) &&
- (((MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
- current_line == 0 && wrap_offset &&
- ((nfd - new) <= prompt_last_invisible) &&
- (col_lendiff < prompt_visible_length)) == 0) &&
- (visible_wrap_offset >= current_invis_chars))
- {
- open_some_spaces (col_lendiff);
- _rl_output_some_chars (nfd, bytes_to_insert);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- _rl_last_c_pos += _rl_col_width (nfd, 0, bytes_to_insert, 1);
- else
- _rl_last_c_pos += bytes_to_insert;
- }
- else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
- {
- /* At the end of a line the characters do not have to
- be "inserted". They can just be placed on the screen. */
- _rl_output_some_chars (nfd, temp);
- _rl_last_c_pos += col_temp;
- return;
- }
- else /* just write from first difference to end of new line */
- {
- _rl_output_some_chars (nfd, temp);
- _rl_last_c_pos += col_temp;
- /* If nfd begins before the last invisible character in the
- prompt, adjust _rl_last_c_pos to account for wrap_offset
- and set cpos_adjusted to let the caller know. */
- if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
- {
- _rl_last_c_pos -= wrap_offset;
- cpos_adjusted = 1;
- }
- return;
- }
-
- if (bytes_to_insert > lendiff)
- {
- /* If nfd begins before the last invisible character in the
- prompt, adjust _rl_last_c_pos to account for wrap_offset
- and set cpos_adjusted to let the caller know. */
- if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
- {
- _rl_last_c_pos -= wrap_offset;
- cpos_adjusted = 1;
- }
- }
- }
- else
- {
- /* cannot insert chars, write to EOL */
- _rl_output_some_chars (nfd, temp);
- _rl_last_c_pos += col_temp;
- /* If we're in a multibyte locale and were before the last invisible
- char in the current line (which implies we just output some invisible
- characters) we need to adjust _rl_last_c_pos, since it represents
- a physical character position. */
- if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
- current_line == prompt_last_screen_line && wrap_offset &&
- displaying_prompt_first_line &&
- wrap_offset != prompt_invis_chars_first_line &&
- ((nfd-new) < (prompt_last_invisible-(current_line*_rl_screenwidth))))
- {
- _rl_last_c_pos -= wrap_offset - prompt_invis_chars_first_line;
- cpos_adjusted = 1;
- }
- }
- }
- else /* Delete characters from line. */
- {
- /* If possible and inexpensive to use terminal deletion, then do so. */
- if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
- {
- /* If all we're doing is erasing the invisible characters in the
- prompt string, don't bother. It screws up the assumptions
- about what's on the screen. */
- if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
- displaying_prompt_first_line &&
- -lendiff == visible_wrap_offset)
- col_lendiff = 0;
-
- /* If we have moved lmargin and we're shrinking the line, we've
- already moved the cursor to the first character of the new line,
- so deleting -col_lendiff characters will mess up the cursor
- position calculation */
- if (_rl_horizontal_scroll_mode && displaying_prompt_first_line == 0 &&
- col_lendiff && _rl_last_c_pos < -col_lendiff)
- col_lendiff = 0;
-
- if (col_lendiff)
- delete_chars (-col_lendiff); /* delete (diff) characters */
-
- /* Copy (new) chars to screen from first diff to last match,
- overwriting what is there. */
- if (bytes_to_insert > 0)
- {
- /* If nfd begins at the prompt, or before the invisible
- characters in the prompt, we need to adjust _rl_last_c_pos
- in a multibyte locale to account for the wrap offset and
- set cpos_adjusted accordingly. */
- _rl_output_some_chars (nfd, bytes_to_insert);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- _rl_last_c_pos += _rl_col_width (nfd, 0, bytes_to_insert, 1);
- if (current_line == 0 && wrap_offset &&
- displaying_prompt_first_line &&
- _rl_last_c_pos > wrap_offset &&
- ((nfd - new) <= prompt_last_invisible))
- {
- _rl_last_c_pos -= wrap_offset;
- cpos_adjusted = 1;
- }
- }
- else
- _rl_last_c_pos += bytes_to_insert;
-
- /* XXX - we only want to do this if we are at the end of the line
- so we move there with _rl_move_cursor_relative */
- if (_rl_horizontal_scroll_mode && ((oe-old) > (ne-new)))
- {
- _rl_move_cursor_relative (ne-new, new);
- goto clear_rest_of_line;
- }
- }
- }
- /* Otherwise, print over the existing material. */
- else
- {
- if (temp > 0)
- {
- /* If nfd begins at the prompt, or before the invisible
- characters in the prompt, we need to adjust _rl_last_c_pos
- in a multibyte locale to account for the wrap offset and
- set cpos_adjusted accordingly. */
- _rl_output_some_chars (nfd, temp);
- _rl_last_c_pos += col_temp; /* XXX */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- if (current_line == 0 && wrap_offset &&
- displaying_prompt_first_line &&
- _rl_last_c_pos > wrap_offset &&
- ((nfd - new) <= prompt_last_invisible))
- {
- _rl_last_c_pos -= wrap_offset;
- cpos_adjusted = 1;
- }
- }
- }
-clear_rest_of_line:
- lendiff = (oe - old) - (ne - new);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- col_lendiff = _rl_col_width (old, 0, oe - old, 1) - _rl_col_width (new, 0, ne - new, 1);
- else
- col_lendiff = lendiff;
-
- /* If we've already printed over the entire width of the screen,
- including the old material, then col_lendiff doesn't matter and
- space_to_eol will insert too many spaces. XXX - maybe we should
- adjust col_lendiff based on the difference between _rl_last_c_pos
- and _rl_screenwidth */
- if (col_lendiff && ((MB_CUR_MAX == 1 || rl_byte_oriented) || (_rl_last_c_pos < _rl_screenwidth)))
- {
- if (_rl_term_autowrap && current_line < inv_botlin)
- space_to_eol (col_lendiff);
- else
- _rl_clear_to_eol (col_lendiff);
- }
- }
- }
-}
-
-/* Tell the update routines that we have moved onto a new (empty) line. */
-int
-rl_on_new_line ()
-{
- if (visible_line)
- visible_line[0] = '\0';
-
- _rl_last_c_pos = _rl_last_v_pos = 0;
- _rl_vis_botlin = last_lmargin = 0;
- if (vis_lbreaks)
- vis_lbreaks[0] = vis_lbreaks[1] = 0;
- visible_wrap_offset = 0;
- return 0;
-}
-
-/* Tell the update routines that we have moved onto a new line with the
- prompt already displayed. Code originally from the version of readline
- distributed with CLISP. rl_expand_prompt must have already been called
- (explicitly or implicitly). This still doesn't work exactly right. */
-int
-rl_on_new_line_with_prompt ()
-{
- int prompt_size, i, l, real_screenwidth, newlines;
- char *prompt_last_line, *lprompt;
-
- /* Initialize visible_line and invisible_line to ensure that they can hold
- the already-displayed prompt. */
- prompt_size = strlen (rl_prompt) + 1;
- init_line_structures (prompt_size);
-
- /* Make sure the line structures hold the already-displayed prompt for
- redisplay. */
- lprompt = local_prompt ? local_prompt : rl_prompt;
- strcpy (visible_line, lprompt);
- strcpy (invisible_line, lprompt);
-
- /* If the prompt contains newlines, take the last tail. */
- prompt_last_line = strrchr (rl_prompt, '\n');
- if (!prompt_last_line)
- prompt_last_line = rl_prompt;
-
- l = strlen (prompt_last_line);
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l, 1); /* XXX */
- else
- _rl_last_c_pos = l;
-
- /* Dissect prompt_last_line into screen lines. Note that here we have
- to use the real screenwidth. Readline's notion of screenwidth might be
- one less, see terminal.c. */
- real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
- _rl_last_v_pos = l / real_screenwidth;
- /* If the prompt length is a multiple of real_screenwidth, we don't know
- whether the cursor is at the end of the last line, or already at the
- beginning of the next line. Output a newline just to be safe. */
- if (l > 0 && (l % real_screenwidth) == 0)
- _rl_output_some_chars ("\n", 1);
- last_lmargin = 0;
-
- newlines = 0; i = 0;
- while (i <= l)
- {
- _rl_vis_botlin = newlines;
- vis_lbreaks[newlines++] = i;
- i += real_screenwidth;
- }
- vis_lbreaks[newlines] = l;
- visible_wrap_offset = 0;
-
- rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
-
- return 0;
-}
-
-/* Actually update the display, period. */
-int
-rl_forced_update_display ()
-{
- register char *temp;
-
- if (visible_line)
- {
- temp = visible_line;
- while (*temp)
- *temp++ = '\0';
- }
- rl_on_new_line ();
- forced_display++;
- (*rl_redisplay_function) ();
- return 0;
-}
-
-/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
- (Well, when we don't have multibyte characters, _rl_last_c_pos is a
- buffer index.)
- DATA is the contents of the screen line of interest; i.e., where
- the movement is being done. */
-void
-_rl_move_cursor_relative (new, data)
- int new;
- const char *data;
-{
- register int i;
- int woff; /* number of invisible chars on current line */
- int cpos, dpos; /* current and desired cursor positions */
- int adjust;
-
- woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset);
- cpos = _rl_last_c_pos;
-
- if (cpos == 0 && cpos == new)
- return;
-
-#if defined (HANDLE_MULTIBYTE)
- /* If we have multibyte characters, NEW is indexed by the buffer point in
- a multibyte string, but _rl_last_c_pos is the display position. In
- this case, NEW's display position is not obvious and must be
- calculated. We need to account for invisible characters in this line,
- as long as we are past them and they are counted by _rl_col_width. */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- adjust = 1;
- /* Try to short-circuit common cases and eliminate a bunch of multibyte
- character function calls. */
- /* 1. prompt string */
- if (new == local_prompt_len && memcmp (data, local_prompt, new) == 0)
- {
- dpos = prompt_physical_chars;
- cpos_adjusted = 1;
- adjust = 0;
- }
- /* 2. prompt_string + line contents */
- else if (new > local_prompt_len && local_prompt && memcmp (data, local_prompt, local_prompt_len) == 0)
- {
- dpos = prompt_physical_chars + _rl_col_width (data, local_prompt_len, new, 1);
- cpos_adjusted = 1;
- adjust = 0;
- }
- else
- dpos = _rl_col_width (data, 0, new, 1);
-
- if (displaying_prompt_first_line == 0)
- adjust = 0;
-
- /* Use NEW when comparing against the last invisible character in the
- prompt string, since they're both buffer indices and DPOS is a
- desired display position. */
- if (adjust && ((new > prompt_last_invisible) || /* XXX - don't use woff here */
- (prompt_physical_chars >= _rl_screenwidth &&
- _rl_last_v_pos == prompt_last_screen_line &&
- wrap_offset >= woff && dpos >= woff &&
- new > (prompt_last_invisible-(_rl_screenwidth*_rl_last_v_pos)-wrap_offset))))
- /* XXX last comparison might need to be >= */
- {
- dpos -= woff;
- /* Since this will be assigned to _rl_last_c_pos at the end (more
- precisely, _rl_last_c_pos == dpos when this function returns),
- let the caller know. */
- cpos_adjusted = 1;
- }
- }
- else
-#endif
- dpos = new;
-
- /* If we don't have to do anything, then return. */
- if (cpos == dpos)
- return;
-
- /* It may be faster to output a CR, and then move forwards instead
- of moving backwards. */
- /* i == current physical cursor position. */
-#if defined (HANDLE_MULTIBYTE)
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- i = _rl_last_c_pos;
- else
-#endif
- i = _rl_last_c_pos - woff;
- if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
- (_rl_term_autowrap && i == _rl_screenwidth))
- {
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif /* !__MSDOS__ */
- cpos = _rl_last_c_pos = 0;
- }
-
- if (cpos < dpos)
- {
- /* Move the cursor forward. We do it by printing the command
- to move the cursor forward if there is one, else print that
- portion of the output buffer again. Which is cheaper? */
-
- /* The above comment is left here for posterity. It is faster
- to print one character (non-control) than to print a control
- sequence telling the terminal to move forward one character.
- That kind of control is for people who don't know what the
- data is underneath the cursor. */
-
- /* However, we need a handle on where the current display position is
- in the buffer for the immediately preceding comment to be true.
- In multibyte locales, we don't currently have that info available.
- Without it, we don't know where the data we have to display begins
- in the buffer and we have to go back to the beginning of the screen
- line. In this case, we can use the terminal sequence to move forward
- if it's available. */
- if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
- {
- if (_rl_term_forward_char)
- {
- for (i = cpos; i < dpos; i++)
- tputs (_rl_term_forward_char, 1, _rl_output_character_function);
- }
- else
- {
- tputs (_rl_term_cr, 1, _rl_output_character_function);
- for (i = 0; i < new; i++)
- putc (data[i], rl_outstream);
- }
- }
- else
- for (i = cpos; i < new; i++)
- putc (data[i], rl_outstream);
- }
-
-#if defined (HANDLE_MULTIBYTE)
- /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
- The byte length of the string is probably bigger than the column width
- of the string, which means that if NEW == _rl_last_c_pos, then NEW's
- display point is less than _rl_last_c_pos. */
-#endif
- else if (cpos > dpos)
- _rl_backspace (cpos - dpos);
-
- _rl_last_c_pos = dpos;
-}
-
-/* PWP: move the cursor up or down. */
-void
-_rl_move_vert (to)
- int to;
-{
- register int delta, i;
-
- if (_rl_last_v_pos == to || to > _rl_screenheight)
- return;
-
- if ((delta = to - _rl_last_v_pos) > 0)
- {
- for (i = 0; i < delta; i++)
- putc ('\n', rl_outstream);
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif
- _rl_last_c_pos = 0;
- }
- else
- { /* delta < 0 */
-#ifdef __DJGPP__
- int row, col;
-
- fflush (rl_outstream);
- ScreenGetCursor (&row, &col);
- ScreenSetCursor (row + delta, col);
- i = -delta;
-#else
- if (_rl_term_up && *_rl_term_up)
- for (i = 0; i < -delta; i++)
- tputs (_rl_term_up, 1, _rl_output_character_function);
-#endif /* !__DJGPP__ */
- }
-
- _rl_last_v_pos = to; /* Now TO is here */
-}
-
-/* Physically print C on rl_outstream. This is for functions which know
- how to optimize the display. Return the number of characters output. */
-int
-rl_show_char (c)
- int c;
-{
- int n = 1;
- if (META_CHAR (c) && (_rl_output_meta_chars == 0))
- {
- fprintf (rl_outstream, "M-");
- n += 2;
- c = UNMETA (c);
- }
-
-#if defined (DISPLAY_TABS)
- if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
-#else
- if (CTRL_CHAR (c) || c == RUBOUT)
-#endif /* !DISPLAY_TABS */
- {
- fprintf (rl_outstream, "C-");
- n += 2;
- c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
- }
-
- putc (c, rl_outstream);
- fflush (rl_outstream);
- return n;
-}
-
-int
-rl_character_len (c, pos)
- register int c, pos;
-{
- unsigned char uc;
-
- uc = (unsigned char)c;
-
- if (META_CHAR (uc))
- return ((_rl_output_meta_chars == 0) ? 4 : 1);
-
- if (uc == '\t')
- {
-#if defined (DISPLAY_TABS)
- return (((pos | 7) + 1) - pos);
-#else
- return (2);
-#endif /* !DISPLAY_TABS */
- }
-
- if (CTRL_CHAR (c) || c == RUBOUT)
- return (2);
-
- return ((ISPRINT (uc)) ? 1 : 2);
-}
-/* How to print things in the "echo-area". The prompt is treated as a
- mini-modeline. */
-static int msg_saved_prompt = 0;
-
-#if defined (USE_VARARGS)
-int
-#if defined (PREFER_STDARG)
-rl_message (const char *format, ...)
-#else
-rl_message (va_alist)
- va_dcl
-#endif
-{
- va_list args;
-#if defined (PREFER_VARARGS)
- char *format;
-#endif
-#if defined (HAVE_VSNPRINTF)
- int bneed;
-#endif
-
-#if defined (PREFER_STDARG)
- va_start (args, format);
-#else
- va_start (args);
- format = va_arg (args, char *);
-#endif
-
- if (msg_buf == 0)
- msg_buf = xmalloc (msg_bufsiz = 128);
-
-#if defined (HAVE_VSNPRINTF)
- bneed = vsnprintf (msg_buf, msg_bufsiz - 1, format, args);
- if (bneed >= msg_bufsiz - 1)
- {
- msg_bufsiz = bneed + 1;
- msg_buf = xrealloc (msg_buf, msg_bufsiz);
- va_end (args);
-
-#if defined (PREFER_STDARG)
- va_start (args, format);
-#else
- va_start (args);
- format = va_arg (args, char *);
-#endif
- vsnprintf (msg_buf, msg_bufsiz - 1, format, args);
- }
-#else
- vsprintf (msg_buf, format, args);
- msg_buf[msg_bufsiz - 1] = '\0'; /* overflow? */
-#endif
- va_end (args);
-
- if (saved_local_prompt == 0)
- {
- rl_save_prompt ();
- msg_saved_prompt = 1;
- }
- else if (local_prompt != saved_local_prompt)
- {
- FREE (local_prompt);
- FREE (local_prompt_prefix);
- local_prompt = (char *)NULL;
- }
- rl_display_prompt = msg_buf;
- local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
- &prompt_last_invisible,
- &prompt_invis_chars_first_line,
- &prompt_physical_chars);
- local_prompt_prefix = (char *)NULL;
- local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
- (*rl_redisplay_function) ();
-
- return 0;
-}
-#else /* !USE_VARARGS */
-int
-rl_message (format, arg1, arg2)
- char *format;
-{
- if (msg_buf == 0)
- msg_buf = xmalloc (msg_bufsiz = 128);
-
- sprintf (msg_buf, format, arg1, arg2);
- msg_buf[msg_bufsiz - 1] = '\0'; /* overflow? */
-
- rl_display_prompt = msg_buf;
- if (saved_local_prompt == 0)
- {
- rl_save_prompt ();
- msg_saved_prompt = 1;
- }
- else if (local_prompt != saved_local_prompt)
- {
- FREE (local_prompt);
- FREE (local_prompt_prefix);
- local_prompt = (char *)NULL;
- }
- local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
- &prompt_last_invisible,
- &prompt_invis_chars_first_line,
- &prompt_physical_chars);
- local_prompt_prefix = (char *)NULL;
- local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
- (*rl_redisplay_function) ();
-
- return 0;
-}
-#endif /* !USE_VARARGS */
-
-/* How to clear things from the "echo-area". */
-int
-rl_clear_message ()
-{
- rl_display_prompt = rl_prompt;
- if (msg_saved_prompt)
- {
- rl_restore_prompt ();
- msg_saved_prompt = 0;
- }
- (*rl_redisplay_function) ();
- return 0;
-}
-
-int
-rl_reset_line_state ()
-{
- rl_on_new_line ();
-
- rl_display_prompt = rl_prompt ? rl_prompt : "";
- forced_display = 1;
- return 0;
-}
-
-void
-rl_save_prompt ()
-{
- saved_local_prompt = local_prompt;
- saved_local_prefix = local_prompt_prefix;
- saved_prefix_length = prompt_prefix_length;
- saved_local_length = local_prompt_len;
- saved_last_invisible = prompt_last_invisible;
- saved_visible_length = prompt_visible_length;
- saved_invis_chars_first_line = prompt_invis_chars_first_line;
- saved_physical_chars = prompt_physical_chars;
-
- local_prompt = local_prompt_prefix = (char *)0;
- local_prompt_len = 0;
- prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
- prompt_invis_chars_first_line = prompt_physical_chars = 0;
-}
-
-void
-rl_restore_prompt ()
-{
- FREE (local_prompt);
- FREE (local_prompt_prefix);
-
- local_prompt = saved_local_prompt;
- local_prompt_prefix = saved_local_prefix;
- local_prompt_len = saved_local_length;
- prompt_prefix_length = saved_prefix_length;
- prompt_last_invisible = saved_last_invisible;
- prompt_visible_length = saved_visible_length;
- prompt_invis_chars_first_line = saved_invis_chars_first_line;
- prompt_physical_chars = saved_physical_chars;
-
- /* can test saved_local_prompt to see if prompt info has been saved. */
- saved_local_prompt = saved_local_prefix = (char *)0;
- saved_local_length = 0;
- saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
- saved_invis_chars_first_line = saved_physical_chars = 0;
-}
-
-char *
-_rl_make_prompt_for_search (pchar)
- int pchar;
-{
- int len;
- char *pmt, *p;
-
- rl_save_prompt ();
-
- /* We've saved the prompt, and can do anything with the various prompt
- strings we need before they're restored. We want the unexpanded
- portion of the prompt string after any final newline. */
- p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
- if (p == 0)
- {
- len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
- pmt = (char *)xmalloc (len + 2);
- if (len)
- strcpy (pmt, rl_prompt);
- pmt[len] = pchar;
- pmt[len+1] = '\0';
- }
- else
- {
- p++;
- len = strlen (p);
- pmt = (char *)xmalloc (len + 2);
- if (len)
- strcpy (pmt, p);
- pmt[len] = pchar;
- pmt[len+1] = '\0';
- }
-
- /* will be overwritten by expand_prompt, called from rl_message */
- prompt_physical_chars = saved_physical_chars + 1;
- return pmt;
-}
-
-/* Quick redisplay hack when erasing characters at the end of the line. */
-void
-_rl_erase_at_end_of_line (l)
- int l;
-{
- register int i;
-
- _rl_backspace (l);
- for (i = 0; i < l; i++)
- putc (' ', rl_outstream);
- _rl_backspace (l);
- for (i = 0; i < l; i++)
- visible_line[--_rl_last_c_pos] = '\0';
- rl_display_fixed++;
-}
-
-/* Clear to the end of the line. COUNT is the minimum
- number of character spaces to clear, */
-void
-_rl_clear_to_eol (count)
- int count;
-{
-#ifndef __MSDOS__
- if (_rl_term_clreol)
- tputs (_rl_term_clreol, 1, _rl_output_character_function);
- else
-#endif
- if (count)
- space_to_eol (count);
-}
-
-/* Clear to the end of the line using spaces. COUNT is the minimum
- number of character spaces to clear, */
-static void
-space_to_eol (count)
- int count;
-{
- register int i;
-
- for (i = 0; i < count; i++)
- putc (' ', rl_outstream);
-
- _rl_last_c_pos += count;
-}
-
-void
-_rl_clear_screen ()
-{
-#ifndef __DJGPP__
- if (_rl_term_clrpag)
- tputs (_rl_term_clrpag, 1, _rl_output_character_function);
- else
- rl_crlf ();
-#else
- ScreenClear ();
- ScreenSetCursor (0, 0);
-#endif /* __DJGPP__ */
-}
-
-/* Insert COUNT characters from STRING to the output stream at column COL. */
-static void
-insert_some_chars (string, count, col)
- char *string;
- int count, col;
-{
- open_some_spaces (col);
- _rl_output_some_chars (string, count);
-}
-
-/* Insert COL spaces, keeping the cursor at the same position. We follow the
- ncurses documentation and use either im/ei with explicit spaces, or IC/ic
- by itself. We assume there will either be ei or we don't need to use it. */
-static void
-open_some_spaces (col)
- int col;
-{
-#if !defined (__MSDOS__) && !defined (__MINGW32__)
- char *buffer;
- register int i;
-
- /* If IC is defined, then we do not have to "enter" insert mode. */
- if (_rl_term_IC)
- {
- buffer = tgoto (_rl_term_IC, 0, col);
- tputs (buffer, 1, _rl_output_character_function);
- }
- else if (_rl_term_im && *_rl_term_im)
- {
- tputs (_rl_term_im, 1, _rl_output_character_function);
- /* just output the desired number of spaces */
- for (i = col; i--; )
- _rl_output_character_function (' ');
- /* If there is a string to turn off insert mode, use it now. */
- if (_rl_term_ei && *_rl_term_ei)
- tputs (_rl_term_ei, 1, _rl_output_character_function);
- /* and move back the right number of spaces */
- _rl_backspace (col);
- }
- else if (_rl_term_ic && *_rl_term_ic)
- {
- /* If there is a special command for inserting characters, then
- use that first to open up the space. */
- for (i = col; i--; )
- tputs (_rl_term_ic, 1, _rl_output_character_function);
- }
-#endif /* !__MSDOS__ && !__MINGW32__ */
-}
-
-/* Delete COUNT characters from the display line. */
-static void
-delete_chars (count)
- int count;
-{
- if (count > _rl_screenwidth) /* XXX */
- return;
-
-#if !defined (__MSDOS__) && !defined (__MINGW32__)
- if (_rl_term_DC && *_rl_term_DC)
- {
- char *buffer;
- buffer = tgoto (_rl_term_DC, count, count);
- tputs (buffer, count, _rl_output_character_function);
- }
- else
- {
- if (_rl_term_dc && *_rl_term_dc)
- while (count--)
- tputs (_rl_term_dc, 1, _rl_output_character_function);
- }
-#endif /* !__MSDOS__ && !__MINGW32__ */
-}
-
-void
-_rl_update_final ()
-{
- int full_lines;
-
- full_lines = 0;
- /* If the cursor is the only thing on an otherwise-blank last line,
- compensate so we don't print an extra CRLF. */
- if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
- visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
- {
- _rl_vis_botlin--;
- full_lines = 1;
- }
- _rl_move_vert (_rl_vis_botlin);
- /* If we've wrapped lines, remove the final xterm line-wrap flag. */
- if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth))
- {
- char *last_line;
-
- last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]];
- cpos_buffer_position = -1; /* don't know where we are in buffer */
- _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); /* XXX */
- _rl_clear_to_eol (0);
- putc (last_line[_rl_screenwidth - 1], rl_outstream);
- }
- _rl_vis_botlin = 0;
- rl_crlf ();
- fflush (rl_outstream);
- rl_display_fixed++;
-}
-
-/* Move to the start of the current line. */
-static void
-cr ()
-{
- if (_rl_term_cr)
- {
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif
- _rl_last_c_pos = 0;
- }
-}
-
-/* Redraw the last line of a multi-line prompt that may possibly contain
- terminal escape sequences. Called with the cursor at column 0 of the
- line to draw the prompt on. */
-static void
-redraw_prompt (t)
- char *t;
-{
- char *oldp;
-
- oldp = rl_display_prompt;
- rl_save_prompt ();
-
- rl_display_prompt = t;
- local_prompt = expand_prompt (t, &prompt_visible_length,
- &prompt_last_invisible,
- &prompt_invis_chars_first_line,
- &prompt_physical_chars);
- local_prompt_prefix = (char *)NULL;
- local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
-
- rl_forced_update_display ();
-
- rl_display_prompt = oldp;
- rl_restore_prompt();
-}
-
-/* Redisplay the current line after a SIGWINCH is received. */
-void
-_rl_redisplay_after_sigwinch ()
-{
- char *t;
-
- /* Clear the last line (assuming that the screen size change will result in
- either more or fewer characters on that line only) and put the cursor at
- column 0. Make sure the right thing happens if we have wrapped to a new
- screen line. */
- if (_rl_term_cr)
- {
- _rl_move_vert (_rl_vis_botlin);
-
-#if defined (__MSDOS__)
- putc ('\r', rl_outstream);
-#else
- tputs (_rl_term_cr, 1, _rl_output_character_function);
-#endif
- _rl_last_c_pos = 0;
-#if defined (__MSDOS__)
- space_to_eol (_rl_screenwidth);
- putc ('\r', rl_outstream);
-#else
- if (_rl_term_clreol)
- tputs (_rl_term_clreol, 1, _rl_output_character_function);
- else
- {
- space_to_eol (_rl_screenwidth);
- tputs (_rl_term_cr, 1, _rl_output_character_function);
- }
-#endif
- if (_rl_last_v_pos > 0)
- _rl_move_vert (0);
- }
- else
- rl_crlf ();
-
- /* Redraw only the last line of a multi-line prompt. */
- t = strrchr (rl_display_prompt, '\n');
- if (t)
- redraw_prompt (++t);
- else
- rl_forced_update_display ();
-}
-
-void
-_rl_clean_up_for_exit ()
-{
- if (_rl_echoing_p)
- {
- if (_rl_vis_botlin > 0) /* minor optimization plus bug fix */
- _rl_move_vert (_rl_vis_botlin);
- _rl_vis_botlin = 0;
- fflush (rl_outstream);
- rl_restart_output (1, 0);
- }
-}
-
-void
-_rl_erase_entire_line ()
-{
- cr ();
- _rl_clear_to_eol (0);
- cr ();
- fflush (rl_outstream);
-}
-
-void
-_rl_ttyflush ()
-{
- fflush (rl_outstream);
-}
-
-/* return the `current display line' of the cursor -- the number of lines to
- move up to get to the first screen line of the current readline line. */
-int
-_rl_current_display_line ()
-{
- int ret, nleft;
-
- /* Find out whether or not there might be invisible characters in the
- editing buffer. */
- if (rl_display_prompt == rl_prompt)
- nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length;
- else
- nleft = _rl_last_c_pos - _rl_screenwidth;
-
- if (nleft > 0)
- ret = 1 + nleft / _rl_screenwidth;
- else
- ret = 0;
-
- return ret;
-}
-
-#if defined (HANDLE_MULTIBYTE)
-/* Calculate the number of screen columns occupied by STR from START to END.
- In the case of multibyte characters with stateful encoding, we have to
- scan from the beginning of the string to take the state into account. */
-static int
-_rl_col_width (str, start, end, flags)
- const char *str;
- int start, end, flags;
-{
- wchar_t wc;
- mbstate_t ps;
- int tmp, point, width, max;
-
- if (end <= start)
- return 0;
- if (MB_CUR_MAX == 1 || rl_byte_oriented)
- /* this can happen in some cases where it's inconvenient to check */
- return (end - start);
-
- memset (&ps, 0, sizeof (mbstate_t));
-
- point = 0;
- max = end;
-
- /* Try to short-circuit common cases. The adjustment to remove wrap_offset
- is done by the caller. */
- /* 1. prompt string */
- if (flags && start == 0 && end == local_prompt_len && memcmp (str, local_prompt, local_prompt_len) == 0)
- return (prompt_physical_chars + wrap_offset);
- /* 2. prompt string + line contents */
- else if (flags && start == 0 && local_prompt_len > 0 && end > local_prompt_len && local_prompt && memcmp (str, local_prompt, local_prompt_len) == 0)
- {
- tmp = prompt_physical_chars + wrap_offset;
- /* XXX - try to call ourselves recursively with non-prompt portion */
- tmp += _rl_col_width (str, local_prompt_len, end, flags);
- return (tmp);
- }
-
- while (point < start)
- {
- tmp = mbrlen (str + point, max, &ps);
- if (MB_INVALIDCH ((size_t)tmp))
- {
- /* In this case, the bytes are invalid or too short to compose a
- multibyte character, so we assume that the first byte represents
- a single character. */
- point++;
- max--;
-
- /* Clear the state of the byte sequence, because in this case the
- effect of mbstate is undefined. */
- memset (&ps, 0, sizeof (mbstate_t));
- }
- else if (MB_NULLWCH (tmp))
- break; /* Found '\0' */
- else
- {
- point += tmp;
- max -= tmp;
- }
- }
-
- /* If START is not a byte that starts a character, then POINT will be
- greater than START. In this case, assume that (POINT - START) gives
- a byte count that is the number of columns of difference. */
- width = point - start;
-
- while (point < end)
- {
- tmp = mbrtowc (&wc, str + point, max, &ps);
- if (MB_INVALIDCH ((size_t)tmp))
- {
- /* In this case, the bytes are invalid or too short to compose a
- multibyte character, so we assume that the first byte represents
- a single character. */
- point++;
- max--;
-
- /* and assume that the byte occupies a single column. */
- width++;
-
- /* Clear the state of the byte sequence, because in this case the
- effect of mbstate is undefined. */
- memset (&ps, 0, sizeof (mbstate_t));
- }
- else if (MB_NULLWCH (tmp))
- break; /* Found '\0' */
- else
- {
- point += tmp;
- max -= tmp;
- tmp = WCWIDTH(wc);
- width += (tmp >= 0) ? tmp : 1;
- }
- }
-
- width += point - end;
-
- return width;
-}
-#endif /* HANDLE_MULTIBYTE */
+++ /dev/null
-/* parse.y - Yacc grammar for bash. */
-
-/* Copyright (C) 1989-2012 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-%{
-#include "config.h"
-
-#include "bashtypes.h"
-#include "bashansi.h"
-
-#include "filecntl.h"
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#if defined (HAVE_LOCALE_H)
-# include <locale.h>
-#endif
-
-#include <stdio.h>
-#include "chartypes.h"
-#include <signal.h>
-
-#include "memalloc.h"
-
-#include "bashintl.h"
-
-#define NEED_STRFTIME_DECL /* used in externs.h */
-
-#include "shell.h"
-#include "typemax.h" /* SIZE_MAX if needed */
-#include "trap.h"
-#include "flags.h"
-#include "parser.h"
-#include "mailcheck.h"
-#include "test.h"
-#include "builtins.h"
-#include "builtins/common.h"
-#include "builtins/builtext.h"
-
-#include "shmbutil.h"
-
-#if defined (READLINE)
-# include "bashline.h"
-# include <readline/readline.h>
-#endif /* READLINE */
-
-#if defined (HISTORY)
-# include "bashhist.h"
-# include <readline/history.h>
-#endif /* HISTORY */
-
-#if defined (JOB_CONTROL)
-# include "jobs.h"
-#endif /* JOB_CONTROL */
-
-#if defined (ALIAS)
-# include "alias.h"
-#else
-typedef void *alias_t;
-#endif /* ALIAS */
-
-#if defined (PROMPT_STRING_DECODE)
-# ifndef _MINIX
-# include <sys/param.h>
-# endif
-# include <time.h>
-# if defined (TM_IN_SYS_TIME)
-# include <sys/types.h>
-# include <sys/time.h>
-# endif /* TM_IN_SYS_TIME */
-# include "maxpath.h"
-#endif /* PROMPT_STRING_DECODE */
-
-#define RE_READ_TOKEN -99
-#define NO_EXPANSION -100
-
-#ifdef DEBUG
-# define YYDEBUG 1
-#else
-# define YYDEBUG 0
-#endif
-
-#if defined (HANDLE_MULTIBYTE)
-# define last_shell_getc_is_singlebyte \
- ((shell_input_line_index > 1) \
- ? shell_input_line_property[shell_input_line_index - 1] \
- : 1)
-# define MBTEST(x) ((x) && last_shell_getc_is_singlebyte)
-#else
-# define last_shell_getc_is_singlebyte 1
-# define MBTEST(x) ((x))
-#endif
-
-#if defined (EXTENDED_GLOB)
-extern int extended_glob;
-#endif
-
-extern int eof_encountered;
-extern int no_line_editing, running_under_emacs;
-extern int current_command_number;
-extern int sourcelevel, parse_and_execute_level;
-extern int posixly_correct;
-extern int last_command_exit_value;
-extern pid_t last_command_subst_pid;
-extern char *shell_name, *current_host_name;
-extern char *dist_version;
-extern int patch_level;
-extern int dump_translatable_strings, dump_po_strings;
-extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
-#if defined (BUFFERED_INPUT)
-extern int bash_input_fd_changed;
-#endif
-
-extern int errno;
-/* **************************************************************** */
-/* */
-/* "Forward" declarations */
-/* */
-/* **************************************************************** */
-
-#ifdef DEBUG
-static void debug_parser __P((int));
-#endif
-
-static int yy_getc __P((void));
-static int yy_ungetc __P((int));
-
-#if defined (READLINE)
-static int yy_readline_get __P((void));
-static int yy_readline_unget __P((int));
-#endif
-
-static int yy_string_get __P((void));
-static int yy_string_unget __P((int));
-static void rewind_input_string __P((void));
-static int yy_stream_get __P((void));
-static int yy_stream_unget __P((int));
-
-static int shell_getc __P((int));
-static void shell_ungetc __P((int));
-static void discard_until __P((int));
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
-static void push_string __P((char *, int, alias_t *));
-static void pop_string __P((void));
-static void free_string_list __P((void));
-#endif
-
-static char *read_a_line __P((int));
-
-static int reserved_word_acceptable __P((int));
-static int yylex __P((void));
-static int alias_expand_token __P((char *));
-static int time_command_acceptable __P((void));
-static int special_case_tokens __P((char *));
-static int read_token __P((int));
-static char *parse_matched_pair __P((int, int, int, int *, int));
-static char *parse_comsub __P((int, int, int, int *, int));
-#if defined (ARRAY_VARS)
-static char *parse_compound_assignment __P((int *));
-#endif
-#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
-static int parse_dparen __P((int));
-static int parse_arith_cmd __P((char **, int));
-#endif
-#if defined (COND_COMMAND)
-static void cond_error __P((void));
-static COND_COM *cond_expr __P((void));
-static COND_COM *cond_or __P((void));
-static COND_COM *cond_and __P((void));
-static COND_COM *cond_term __P((void));
-static int cond_skip_newlines __P((void));
-static COMMAND *parse_cond_command __P((void));
-#endif
-#if defined (ARRAY_VARS)
-static int token_is_assignment __P((char *, int));
-static int token_is_ident __P((char *, int));
-#endif
-static int read_token_word __P((int));
-static void discard_parser_constructs __P((int));
-
-static char *error_token_from_token __P((int));
-static char *error_token_from_text __P((void));
-static void print_offending_line __P((void));
-static void report_syntax_error __P((char *));
-
-static void handle_eof_input_unit __P((void));
-static void prompt_again __P((void));
-#if 0
-static void reset_readline_prompt __P((void));
-#endif
-static void print_prompt __P((void));
-
-#if defined (HANDLE_MULTIBYTE)
-static void set_line_mbstate __P((void));
-static char *shell_input_line_property = NULL;
-#else
-# define set_line_mbstate()
-#endif
-
-extern int yyerror __P((const char *));
-
-#ifdef DEBUG
-extern int yydebug;
-#endif
-
-/* Default prompt strings */
-char *primary_prompt = PPROMPT;
-char *secondary_prompt = SPROMPT;
-
-/* PROMPT_STRING_POINTER points to one of these, never to an actual string. */
-char *ps1_prompt, *ps2_prompt;
-
-/* Handle on the current prompt string. Indirectly points through
- ps1_ or ps2_prompt. */
-char **prompt_string_pointer = (char **)NULL;
-char *current_prompt_string;
-
-/* Non-zero means we expand aliases in commands. */
-int expand_aliases = 0;
-
-/* If non-zero, the decoded prompt string undergoes parameter and
- variable substitution, command substitution, arithmetic substitution,
- string expansion, process substitution, and quote removal in
- decode_prompt_string. */
-int promptvars = 1;
-
-/* If non-zero, $'...' and $"..." are expanded when they appear within
- a ${...} expansion, even when the expansion appears within double
- quotes. */
-int extended_quote = 1;
-
-/* The number of lines read from input while creating the current command. */
-int current_command_line_count;
-
-/* The number of lines in a command saved while we run parse_and_execute */
-int saved_command_line_count;
-
-/* The token that currently denotes the end of parse. */
-int shell_eof_token;
-
-/* The token currently being read. */
-int current_token;
-
-/* The current parser state. */
-int parser_state;
-
-/* Variables to manage the task of reading here documents, because we need to
- defer the reading until after a complete command has been collected. */
-static REDIRECT *redir_stack[10];
-int need_here_doc;
-
-/* Where shell input comes from. History expansion is performed on each
- line when the shell is interactive. */
-static char *shell_input_line = (char *)NULL;
-static size_t shell_input_line_index;
-static size_t shell_input_line_size; /* Amount allocated for shell_input_line. */
-static size_t shell_input_line_len; /* strlen (shell_input_line) */
-
-/* Either zero or EOF. */
-static int shell_input_line_terminator;
-
-/* The line number in a script on which a function definition starts. */
-static int function_dstart;
-
-/* The line number in a script on which a function body starts. */
-static int function_bstart;
-
-/* The line number in a script at which an arithmetic for command starts. */
-static int arith_for_lineno;
-
-/* The decoded prompt string. Used if READLINE is not defined or if
- editing is turned off. Analogous to current_readline_prompt. */
-static char *current_decoded_prompt;
-
-/* The last read token, or NULL. read_token () uses this for context
- checking. */
-static int last_read_token;
-
-/* The token read prior to last_read_token. */
-static int token_before_that;
-
-/* The token read prior to token_before_that. */
-static int two_tokens_ago;
-
-static int global_extglob;
-
-/* The line number in a script where the word in a `case WORD', `select WORD'
- or `for WORD' begins. This is a nested command maximum, since the array
- index is decremented after a case, select, or for command is parsed. */
-#define MAX_CASE_NEST 128
-static int word_lineno[MAX_CASE_NEST];
-static int word_top = -1;
-
-/* If non-zero, it is the token that we want read_token to return
- regardless of what text is (or isn't) present to be read. This
- is reset by read_token. If token_to_read == WORD or
- ASSIGNMENT_WORD, yylval.word should be set to word_desc_to_read. */
-static int token_to_read;
-static WORD_DESC *word_desc_to_read;
-
-static REDIRECTEE source;
-static REDIRECTEE redir;
-%}
-
-%union {
- WORD_DESC *word; /* the word that we read. */
- int number; /* the number that we read. */
- WORD_LIST *word_list;
- COMMAND *command;
- REDIRECT *redirect;
- ELEMENT element;
- PATTERN_LIST *pattern;
-}
-
-/* Reserved words. Members of the first group are only recognized
- in the case that they are preceded by a list_terminator. Members
- of the second group are for [[...]] commands. Members of the
- third group are recognized only under special circumstances. */
-%token IF THEN ELSE ELIF FI CASE ESAC FOR SELECT WHILE UNTIL DO DONE FUNCTION COPROC
-%token COND_START COND_END COND_ERROR
-%token IN BANG TIME TIMEOPT TIMEIGN
-
-/* More general tokens. yylex () knows how to make these. */
-%token <word> WORD ASSIGNMENT_WORD REDIR_WORD
-%token <number> NUMBER
-%token <word_list> ARITH_CMD ARITH_FOR_EXPRS
-%token <command> COND_CMD
-%token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND LESS_LESS_LESS
-%token GREATER_AND SEMI_SEMI SEMI_AND SEMI_SEMI_AND
-%token LESS_LESS_MINUS AND_GREATER AND_GREATER_GREATER LESS_GREATER
-%token GREATER_BAR BAR_AND
-
-/* The types that the various syntactical units return. */
-
-%type <command> inputunit command pipeline pipeline_command
-%type <command> list list0 list1 compound_list simple_list simple_list1
-%type <command> simple_command shell_command
-%type <command> for_command select_command case_command group_command
-%type <command> arith_command
-%type <command> cond_command
-%type <command> arith_for_command
-%type <command> coproc
-%type <command> function_def function_body if_command elif_clause subshell
-%type <redirect> redirection redirection_list
-%type <element> simple_command_element
-%type <word_list> word_list pattern
-%type <pattern> pattern_list case_clause_sequence case_clause
-%type <number> timespec
-%type <number> list_terminator
-
-%start inputunit
-
-%left '&' ';' '\n' yacc_EOF
-%left AND_AND OR_OR
-%right '|' BAR_AND
-%%
-
-inputunit: simple_list simple_list_terminator
- {
- /* Case of regular command. Discard the error
- safety net,and return the command just parsed. */
- global_command = $1;
- eof_encountered = 0;
- /* discard_parser_constructs (0); */
- if (parser_state & PST_CMDSUBST)
- parser_state |= PST_EOFTOKEN;
- YYACCEPT;
- }
- | '\n'
- {
- /* Case of regular command, but not a very
- interesting one. Return a NULL command. */
- global_command = (COMMAND *)NULL;
- if (parser_state & PST_CMDSUBST)
- parser_state |= PST_EOFTOKEN;
- YYACCEPT;
- }
- | error '\n'
- {
- /* Error during parsing. Return NULL command. */
- global_command = (COMMAND *)NULL;
- eof_encountered = 0;
- /* discard_parser_constructs (1); */
- if (interactive && parse_and_execute_level == 0)
- {
- YYACCEPT;
- }
- else
- {
- YYABORT;
- }
- }
- | yacc_EOF
- {
- /* Case of EOF seen by itself. Do ignoreeof or
- not. */
- global_command = (COMMAND *)NULL;
- handle_eof_input_unit ();
- YYACCEPT;
- }
- ;
-
-word_list: WORD
- { $$ = make_word_list ($1, (WORD_LIST *)NULL); }
- | word_list WORD
- { $$ = make_word_list ($2, $1); }
- ;
-
-redirection: '>' WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_output_direction, redir, 0);
- }
- | '<' WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_input_direction, redir, 0);
- }
- | NUMBER '>' WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_output_direction, redir, 0);
- }
- | NUMBER '<' WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_input_direction, redir, 0);
- }
- | REDIR_WORD '>' WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_output_direction, redir, REDIR_VARASSIGN);
- }
- | REDIR_WORD '<' WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_input_direction, redir, REDIR_VARASSIGN);
- }
- | GREATER_GREATER WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_appending_to, redir, 0);
- }
- | NUMBER GREATER_GREATER WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_appending_to, redir, 0);
- }
- | REDIR_WORD GREATER_GREATER WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_appending_to, redir, REDIR_VARASSIGN);
- }
- | GREATER_BAR WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_output_force, redir, 0);
- }
- | NUMBER GREATER_BAR WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_output_force, redir, 0);
- }
- | REDIR_WORD GREATER_BAR WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_output_force, redir, REDIR_VARASSIGN);
- }
- | LESS_GREATER WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_input_output, redir, 0);
- }
- | NUMBER LESS_GREATER WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_input_output, redir, 0);
- }
- | REDIR_WORD LESS_GREATER WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_input_output, redir, REDIR_VARASSIGN);
- }
- | LESS_LESS WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_reading_until, redir, 0);
- redir_stack[need_here_doc++] = $$;
- }
- | NUMBER LESS_LESS WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_reading_until, redir, 0);
- redir_stack[need_here_doc++] = $$;
- }
- | REDIR_WORD LESS_LESS WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
- redir_stack[need_here_doc++] = $$;
- }
- | LESS_LESS_MINUS WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
- redir_stack[need_here_doc++] = $$;
- }
- | NUMBER LESS_LESS_MINUS WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
- redir_stack[need_here_doc++] = $$;
- }
- | REDIR_WORD LESS_LESS_MINUS WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
- redir_stack[need_here_doc++] = $$;
- }
- | LESS_LESS_LESS WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_reading_string, redir, 0);
- }
- | NUMBER LESS_LESS_LESS WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_reading_string, redir, 0);
- }
- | REDIR_WORD LESS_LESS_LESS WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_reading_string, redir, REDIR_VARASSIGN);
- }
- | LESS_AND NUMBER
- {
- source.dest = 0;
- redir.dest = $2;
- $$ = make_redirection (source, r_duplicating_input, redir, 0);
- }
- | NUMBER LESS_AND NUMBER
- {
- source.dest = $1;
- redir.dest = $3;
- $$ = make_redirection (source, r_duplicating_input, redir, 0);
- }
- | REDIR_WORD LESS_AND NUMBER
- {
- source.filename = $1;
- redir.dest = $3;
- $$ = make_redirection (source, r_duplicating_input, redir, REDIR_VARASSIGN);
- }
- | GREATER_AND NUMBER
- {
- source.dest = 1;
- redir.dest = $2;
- $$ = make_redirection (source, r_duplicating_output, redir, 0);
- }
- | NUMBER GREATER_AND NUMBER
- {
- source.dest = $1;
- redir.dest = $3;
- $$ = make_redirection (source, r_duplicating_output, redir, 0);
- }
- | REDIR_WORD GREATER_AND NUMBER
- {
- source.filename = $1;
- redir.dest = $3;
- $$ = make_redirection (source, r_duplicating_output, redir, REDIR_VARASSIGN);
- }
- | LESS_AND WORD
- {
- source.dest = 0;
- redir.filename = $2;
- $$ = make_redirection (source, r_duplicating_input_word, redir, 0);
- }
- | NUMBER LESS_AND WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_duplicating_input_word, redir, 0);
- }
- | REDIR_WORD LESS_AND WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_duplicating_input_word, redir, REDIR_VARASSIGN);
- }
- | GREATER_AND WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_duplicating_output_word, redir, 0);
- }
- | NUMBER GREATER_AND WORD
- {
- source.dest = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_duplicating_output_word, redir, 0);
- }
- | REDIR_WORD GREATER_AND WORD
- {
- source.filename = $1;
- redir.filename = $3;
- $$ = make_redirection (source, r_duplicating_output_word, redir, REDIR_VARASSIGN);
- }
- | GREATER_AND '-'
- {
- source.dest = 1;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, 0);
- }
- | NUMBER GREATER_AND '-'
- {
- source.dest = $1;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, 0);
- }
- | REDIR_WORD GREATER_AND '-'
- {
- source.filename = $1;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
- }
- | LESS_AND '-'
- {
- source.dest = 0;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, 0);
- }
- | NUMBER LESS_AND '-'
- {
- source.dest = $1;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, 0);
- }
- | REDIR_WORD LESS_AND '-'
- {
- source.filename = $1;
- redir.dest = 0;
- $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
- }
- | AND_GREATER WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_err_and_out, redir, 0);
- }
- | AND_GREATER_GREATER WORD
- {
- source.dest = 1;
- redir.filename = $2;
- $$ = make_redirection (source, r_append_err_and_out, redir, 0);
- }
- ;
-
-simple_command_element: WORD
- { $$.word = $1; $$.redirect = 0; }
- | ASSIGNMENT_WORD
- { $$.word = $1; $$.redirect = 0; }
- | redirection
- { $$.redirect = $1; $$.word = 0; }
- ;
-
-redirection_list: redirection
- {
- $$ = $1;
- }
- | redirection_list redirection
- {
- register REDIRECT *t;
-
- for (t = $1; t->next; t = t->next)
- ;
- t->next = $2;
- $$ = $1;
- }
- ;
-
-simple_command: simple_command_element
- { $$ = make_simple_command ($1, (COMMAND *)NULL); }
- | simple_command simple_command_element
- { $$ = make_simple_command ($2, $1); }
- ;
-
-command: simple_command
- { $$ = clean_simple_command ($1); }
- | shell_command
- { $$ = $1; }
- | shell_command redirection_list
- {
- COMMAND *tc;
-
- tc = $1;
- if (tc->redirects)
- {
- register REDIRECT *t;
- for (t = tc->redirects; t->next; t = t->next)
- ;
- t->next = $2;
- }
- else
- tc->redirects = $2;
- $$ = $1;
- }
- | function_def
- { $$ = $1; }
- | coproc
- { $$ = $1; }
- ;
-
-shell_command: for_command
- { $$ = $1; }
- | case_command
- { $$ = $1; }
- | WHILE compound_list DO compound_list DONE
- { $$ = make_while_command ($2, $4); }
- | UNTIL compound_list DO compound_list DONE
- { $$ = make_until_command ($2, $4); }
- | select_command
- { $$ = $1; }
- | if_command
- { $$ = $1; }
- | subshell
- { $$ = $1; }
- | group_command
- { $$ = $1; }
- | arith_command
- { $$ = $1; }
- | cond_command
- { $$ = $1; }
- | arith_for_command
- { $$ = $1; }
- ;
-
-for_command: FOR WORD newline_list DO compound_list DONE
- {
- $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD newline_list '{' compound_list '}'
- {
- $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD ';' newline_list DO compound_list DONE
- {
- $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD ';' newline_list '{' compound_list '}'
- {
- $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
- {
- $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
- {
- $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE
- {
- $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}'
- {
- $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- ;
-
-arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE
- {
- $$ = make_arith_for_command ($2, $6, arith_for_lineno);
- if (word_top > 0) word_top--;
- }
- | FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}'
- {
- $$ = make_arith_for_command ($2, $6, arith_for_lineno);
- if (word_top > 0) word_top--;
- }
- | FOR ARITH_FOR_EXPRS DO compound_list DONE
- {
- $$ = make_arith_for_command ($2, $4, arith_for_lineno);
- if (word_top > 0) word_top--;
- }
- | FOR ARITH_FOR_EXPRS '{' compound_list '}'
- {
- $$ = make_arith_for_command ($2, $4, arith_for_lineno);
- if (word_top > 0) word_top--;
- }
- ;
-
-select_command: SELECT WORD newline_list DO list DONE
- {
- $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | SELECT WORD newline_list '{' list '}'
- {
- $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | SELECT WORD ';' newline_list DO list DONE
- {
- $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | SELECT WORD ';' newline_list '{' list '}'
- {
- $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | SELECT WORD newline_list IN word_list list_terminator newline_list DO list DONE
- {
- $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | SELECT WORD newline_list IN word_list list_terminator newline_list '{' list '}'
- {
- $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- ;
-
-case_command: CASE WORD newline_list IN newline_list ESAC
- {
- $$ = make_case_command ($2, (PATTERN_LIST *)NULL, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | CASE WORD newline_list IN case_clause_sequence newline_list ESAC
- {
- $$ = make_case_command ($2, $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- | CASE WORD newline_list IN case_clause ESAC
- {
- $$ = make_case_command ($2, $5, word_lineno[word_top]);
- if (word_top > 0) word_top--;
- }
- ;
-
-function_def: WORD '(' ')' newline_list function_body
- { $$ = make_function_def ($1, $5, function_dstart, function_bstart); }
-
- | FUNCTION WORD '(' ')' newline_list function_body
- { $$ = make_function_def ($2, $6, function_dstart, function_bstart); }
-
- | FUNCTION WORD newline_list function_body
- { $$ = make_function_def ($2, $4, function_dstart, function_bstart); }
- ;
-
-function_body: shell_command
- { $$ = $1; }
- | shell_command redirection_list
- {
- COMMAND *tc;
-
- tc = $1;
- /* According to Posix.2 3.9.5, redirections
- specified after the body of a function should
- be attached to the function and performed when
- the function is executed, not as part of the
- function definition command. */
- /* XXX - I don't think it matters, but we might
- want to change this in the future to avoid
- problems differentiating between a function
- definition with a redirection and a function
- definition containing a single command with a
- redirection. The two are semantically equivalent,
- though -- the only difference is in how the
- command printing code displays the redirections. */
- if (tc->redirects)
- {
- register REDIRECT *t;
- for (t = tc->redirects; t->next; t = t->next)
- ;
- t->next = $2;
- }
- else
- tc->redirects = $2;
- $$ = $1;
- }
- ;
-
-subshell: '(' compound_list ')'
- {
- $$ = make_subshell_command ($2);
- $$->flags |= CMD_WANT_SUBSHELL;
- }
- ;
-
-coproc: COPROC shell_command
- {
- $$ = make_coproc_command ("COPROC", $2);
- $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
- }
- | COPROC shell_command redirection_list
- {
- COMMAND *tc;
-
- tc = $2;
- if (tc->redirects)
- {
- register REDIRECT *t;
- for (t = tc->redirects; t->next; t = t->next)
- ;
- t->next = $3;
- }
- else
- tc->redirects = $3;
- $$ = make_coproc_command ("COPROC", $2);
- $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
- }
- | COPROC WORD shell_command
- {
- $$ = make_coproc_command ($2->word, $3);
- $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
- }
- | COPROC WORD shell_command redirection_list
- {
- COMMAND *tc;
-
- tc = $3;
- if (tc->redirects)
- {
- register REDIRECT *t;
- for (t = tc->redirects; t->next; t = t->next)
- ;
- t->next = $4;
- }
- else
- tc->redirects = $4;
- $$ = make_coproc_command ($2->word, $3);
- $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
- }
- | COPROC simple_command
- {
- $$ = make_coproc_command ("COPROC", clean_simple_command ($2));
- $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
- }
- ;
-
-if_command: IF compound_list THEN compound_list FI
- { $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
- | IF compound_list THEN compound_list ELSE compound_list FI
- { $$ = make_if_command ($2, $4, $6); }
- | IF compound_list THEN compound_list elif_clause FI
- { $$ = make_if_command ($2, $4, $5); }
- ;
-
-
-group_command: '{' compound_list '}'
- { $$ = make_group_command ($2); }
- ;
-
-arith_command: ARITH_CMD
- { $$ = make_arith_command ($1); }
- ;
-
-cond_command: COND_START COND_CMD COND_END
- { $$ = $2; }
- ;
-
-elif_clause: ELIF compound_list THEN compound_list
- { $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
- | ELIF compound_list THEN compound_list ELSE compound_list
- { $$ = make_if_command ($2, $4, $6); }
- | ELIF compound_list THEN compound_list elif_clause
- { $$ = make_if_command ($2, $4, $5); }
- ;
-
-case_clause: pattern_list
- | case_clause_sequence pattern_list
- { $2->next = $1; $$ = $2; }
- ;
-
-pattern_list: newline_list pattern ')' compound_list
- { $$ = make_pattern_list ($2, $4); }
- | newline_list pattern ')' newline_list
- { $$ = make_pattern_list ($2, (COMMAND *)NULL); }
- | newline_list '(' pattern ')' compound_list
- { $$ = make_pattern_list ($3, $5); }
- | newline_list '(' pattern ')' newline_list
- { $$ = make_pattern_list ($3, (COMMAND *)NULL); }
- ;
-
-case_clause_sequence: pattern_list SEMI_SEMI
- { $$ = $1; }
- | case_clause_sequence pattern_list SEMI_SEMI
- { $2->next = $1; $$ = $2; }
- | pattern_list SEMI_AND
- { $1->flags |= CASEPAT_FALLTHROUGH; $$ = $1; }
- | case_clause_sequence pattern_list SEMI_AND
- { $2->flags |= CASEPAT_FALLTHROUGH; $2->next = $1; $$ = $2; }
- | pattern_list SEMI_SEMI_AND
- { $1->flags |= CASEPAT_TESTNEXT; $$ = $1; }
- | case_clause_sequence pattern_list SEMI_SEMI_AND
- { $2->flags |= CASEPAT_TESTNEXT; $2->next = $1; $$ = $2; }
- ;
-
-pattern: WORD
- { $$ = make_word_list ($1, (WORD_LIST *)NULL); }
- | pattern '|' WORD
- { $$ = make_word_list ($3, $1); }
- ;
-
-/* A list allows leading or trailing newlines and
- newlines as operators (equivalent to semicolons).
- It must end with a newline or semicolon.
- Lists are used within commands such as if, for, while. */
-
-list: newline_list list0
- {
- $$ = $2;
- if (need_here_doc)
- gather_here_documents ();
- }
- ;
-
-compound_list: list
- | newline_list list1
- {
- $$ = $2;
- }
- ;
-
-list0: list1 '\n' newline_list
- | list1 '&' newline_list
- {
- if ($1->type == cm_connection)
- $$ = connect_async_list ($1, (COMMAND *)NULL, '&');
- else
- $$ = command_connect ($1, (COMMAND *)NULL, '&');
- }
- | list1 ';' newline_list
-
- ;
-
-list1: list1 AND_AND newline_list list1
- { $$ = command_connect ($1, $4, AND_AND); }
- | list1 OR_OR newline_list list1
- { $$ = command_connect ($1, $4, OR_OR); }
- | list1 '&' newline_list list1
- {
- if ($1->type == cm_connection)
- $$ = connect_async_list ($1, $4, '&');
- else
- $$ = command_connect ($1, $4, '&');
- }
- | list1 ';' newline_list list1
- { $$ = command_connect ($1, $4, ';'); }
- | list1 '\n' newline_list list1
- { $$ = command_connect ($1, $4, ';'); }
- | pipeline_command
- { $$ = $1; }
- ;
-
-simple_list_terminator: '\n'
- | yacc_EOF
- ;
-
-list_terminator:'\n'
- { $$ = '\n'; }
- | ';'
- { $$ = ';'; }
- | yacc_EOF
- { $$ = yacc_EOF; }
- ;
-
-newline_list:
- | newline_list '\n'
- ;
-
-/* A simple_list is a list that contains no significant newlines
- and no leading or trailing newlines. Newlines are allowed
- only following operators, where they are not significant.
-
- This is what an inputunit consists of. */
-
-simple_list: simple_list1
- {
- $$ = $1;
- if (need_here_doc)
- gather_here_documents ();
- if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
- {
- global_command = $1;
- eof_encountered = 0;
- rewind_input_string ();
- YYACCEPT;
- }
- }
- | simple_list1 '&'
- {
- if ($1->type == cm_connection)
- $$ = connect_async_list ($1, (COMMAND *)NULL, '&');
- else
- $$ = command_connect ($1, (COMMAND *)NULL, '&');
- if (need_here_doc)
- gather_here_documents ();
- if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
- {
- global_command = $1;
- eof_encountered = 0;
- rewind_input_string ();
- YYACCEPT;
- }
- }
- | simple_list1 ';'
- {
- $$ = $1;
- if (need_here_doc)
- gather_here_documents ();
- if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
- {
- global_command = $1;
- eof_encountered = 0;
- rewind_input_string ();
- YYACCEPT;
- }
- }
- ;
-
-simple_list1: simple_list1 AND_AND newline_list simple_list1
- { $$ = command_connect ($1, $4, AND_AND); }
- | simple_list1 OR_OR newline_list simple_list1
- { $$ = command_connect ($1, $4, OR_OR); }
- | simple_list1 '&' simple_list1
- {
- if ($1->type == cm_connection)
- $$ = connect_async_list ($1, $3, '&');
- else
- $$ = command_connect ($1, $3, '&');
- }
- | simple_list1 ';' simple_list1
- { $$ = command_connect ($1, $3, ';'); }
-
- | pipeline_command
- { $$ = $1; }
- ;
-
-pipeline_command: pipeline
- { $$ = $1; }
- | BANG pipeline_command
- {
- if ($2)
- $2->flags ^= CMD_INVERT_RETURN; /* toggle */
- $$ = $2;
- }
- | timespec pipeline_command
- {
- if ($2)
- $2->flags |= $1;
- $$ = $2;
- }
- | timespec list_terminator
- {
- ELEMENT x;
-
- /* Boy, this is unclean. `time' by itself can
- time a null command. We cheat and push a
- newline back if the list_terminator was a newline
- to avoid the double-newline problem (one to
- terminate this, one to terminate the command) */
- x.word = 0;
- x.redirect = 0;
- $$ = make_simple_command (x, (COMMAND *)NULL);
- $$->flags |= $1;
- /* XXX - let's cheat and push a newline back */
- if ($2 == '\n')
- token_to_read = '\n';
- }
- | BANG list_terminator
- {
- ELEMENT x;
-
- /* This is just as unclean. Posix says that `!'
- by itself should be equivalent to `false'.
- We cheat and push a
- newline back if the list_terminator was a newline
- to avoid the double-newline problem (one to
- terminate this, one to terminate the command) */
- x.word = 0;
- x.redirect = 0;
- $$ = make_simple_command (x, (COMMAND *)NULL);
- $$->flags |= CMD_INVERT_RETURN;
- /* XXX - let's cheat and push a newline back */
- if ($2 == '\n')
- token_to_read = '\n';
- }
- ;
-
-pipeline: pipeline '|' newline_list pipeline
- { $$ = command_connect ($1, $4, '|'); }
- | pipeline BAR_AND newline_list pipeline
- {
- /* Make cmd1 |& cmd2 equivalent to cmd1 2>&1 | cmd2 */
- COMMAND *tc;
- REDIRECTEE rd, sd;
- REDIRECT *r;
-
- tc = $1->type == cm_simple ? (COMMAND *)$1->value.Simple : $1;
- sd.dest = 2;
- rd.dest = 1;
- r = make_redirection (sd, r_duplicating_output, rd, 0);
- if (tc->redirects)
- {
- register REDIRECT *t;
- for (t = tc->redirects; t->next; t = t->next)
- ;
- t->next = r;
- }
- else
- tc->redirects = r;
-
- $$ = command_connect ($1, $4, '|');
- }
- | command
- { $$ = $1; }
- ;
-
-timespec: TIME
- { $$ = CMD_TIME_PIPELINE; }
- | TIME TIMEOPT
- { $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; }
- | TIME TIMEOPT TIMEIGN
- { $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; }
- ;
-%%
-
-/* Initial size to allocate for tokens, and the
- amount to grow them by. */
-#define TOKEN_DEFAULT_INITIAL_SIZE 496
-#define TOKEN_DEFAULT_GROW_SIZE 512
-
-/* Should we call prompt_again? */
-#define SHOULD_PROMPT() \
- (interactive && (bash_input.type == st_stdin || bash_input.type == st_stream))
-
-#if defined (ALIAS)
-# define expanding_alias() (pushed_string_list && pushed_string_list->expander)
-#else
-# define expanding_alias() 0
-#endif
-
-/* Global var is non-zero when end of file has been reached. */
-int EOF_Reached = 0;
-
-#ifdef DEBUG
-static void
-debug_parser (i)
- int i;
-{
-#if YYDEBUG != 0
- yydebug = i;
-#endif
-}
-#endif
-
-/* yy_getc () returns the next available character from input or EOF.
- yy_ungetc (c) makes `c' the next character to read.
- init_yy_io (get, unget, type, location) makes the function GET the
- installed function for getting the next character, makes UNGET the
- installed function for un-getting a character, sets the type of stream
- (either string or file) from TYPE, and makes LOCATION point to where
- the input is coming from. */
-
-/* Unconditionally returns end-of-file. */
-int
-return_EOF ()
-{
- return (EOF);
-}
-
-/* Variable containing the current get and unget functions.
- See ./input.h for a clearer description. */
-BASH_INPUT bash_input;
-
-/* Set all of the fields in BASH_INPUT to NULL. Free bash_input.name if it
- is non-null, avoiding a memory leak. */
-void
-initialize_bash_input ()
-{
- bash_input.type = st_none;
- FREE (bash_input.name);
- bash_input.name = (char *)NULL;
- bash_input.location.file = (FILE *)NULL;
- bash_input.location.string = (char *)NULL;
- bash_input.getter = (sh_cget_func_t *)NULL;
- bash_input.ungetter = (sh_cunget_func_t *)NULL;
-}
-
-/* Set the contents of the current bash input stream from
- GET, UNGET, TYPE, NAME, and LOCATION. */
-void
-init_yy_io (get, unget, type, name, location)
- sh_cget_func_t *get;
- sh_cunget_func_t *unget;
- enum stream_type type;
- const char *name;
- INPUT_STREAM location;
-{
- bash_input.type = type;
- FREE (bash_input.name);
- bash_input.name = name ? savestring (name) : (char *)NULL;
-
- /* XXX */
-#if defined (CRAY)
- memcpy((char *)&bash_input.location.string, (char *)&location.string, sizeof(location));
-#else
- bash_input.location = location;
-#endif
- bash_input.getter = get;
- bash_input.ungetter = unget;
-}
-
-char *
-yy_input_name ()
-{
- return (bash_input.name ? bash_input.name : "stdin");
-}
-
-/* Call this to get the next character of input. */
-static int
-yy_getc ()
-{
- return (*(bash_input.getter)) ();
-}
-
-/* Call this to unget C. That is, to make C the next character
- to be read. */
-static int
-yy_ungetc (c)
- int c;
-{
- return (*(bash_input.ungetter)) (c);
-}
-
-#if defined (BUFFERED_INPUT)
-#ifdef INCLUDE_UNUSED
-int
-input_file_descriptor ()
-{
- switch (bash_input.type)
- {
- case st_stream:
- return (fileno (bash_input.location.file));
- case st_bstream:
- return (bash_input.location.buffered_fd);
- case st_stdin:
- default:
- return (fileno (stdin));
- }
-}
-#endif
-#endif /* BUFFERED_INPUT */
-
-/* **************************************************************** */
-/* */
-/* Let input be read from readline (). */
-/* */
-/* **************************************************************** */
-
-#if defined (READLINE)
-char *current_readline_prompt = (char *)NULL;
-char *current_readline_line = (char *)NULL;
-int current_readline_line_index = 0;
-
-static int
-yy_readline_get ()
-{
- SigHandler *old_sigint;
- int line_len;
- unsigned char c;
-
- if (!current_readline_line)
- {
- if (!bash_readline_initialized)
- initialize_readline ();
-
-#if defined (JOB_CONTROL)
- if (job_control)
- give_terminal_to (shell_pgrp, 0);
-#endif /* JOB_CONTROL */
-
- old_sigint = (SigHandler *)IMPOSSIBLE_TRAP_HANDLER;
- if (signal_is_ignored (SIGINT) == 0)
- {
- /* interrupt_immediately++; */
- old_sigint = (SigHandler *)set_signal_handler (SIGINT, sigint_sighandler);
- }
-
- current_readline_line = readline (current_readline_prompt ?
- current_readline_prompt : "");
-
- CHECK_TERMSIG;
- if (signal_is_ignored (SIGINT) == 0)
- {
- /* interrupt_immediately--; */
- if (old_sigint != IMPOSSIBLE_TRAP_HANDLER)
- set_signal_handler (SIGINT, old_sigint);
- }
-
-#if 0
- /* Reset the prompt to the decoded value of prompt_string_pointer. */
- reset_readline_prompt ();
-#endif
-
- if (current_readline_line == 0)
- return (EOF);
-
- current_readline_line_index = 0;
- line_len = strlen (current_readline_line);
-
- current_readline_line = (char *)xrealloc (current_readline_line, 2 + line_len);
- current_readline_line[line_len++] = '\n';
- current_readline_line[line_len] = '\0';
- }
-
- if (current_readline_line[current_readline_line_index] == 0)
- {
- free (current_readline_line);
- current_readline_line = (char *)NULL;
- return (yy_readline_get ());
- }
- else
- {
- c = current_readline_line[current_readline_line_index++];
- return (c);
- }
-}
-
-static int
-yy_readline_unget (c)
- int c;
-{
- if (current_readline_line_index && current_readline_line)
- current_readline_line[--current_readline_line_index] = c;
- return (c);
-}
-
-void
-with_input_from_stdin ()
-{
- INPUT_STREAM location;
-
- if (bash_input.type != st_stdin && stream_on_stack (st_stdin) == 0)
- {
- location.string = current_readline_line;
- init_yy_io (yy_readline_get, yy_readline_unget,
- st_stdin, "readline stdin", location);
- }
-}
-
-#else /* !READLINE */
-
-void
-with_input_from_stdin ()
-{
- with_input_from_stream (stdin, "stdin");
-}
-#endif /* !READLINE */
-
-/* **************************************************************** */
-/* */
-/* Let input come from STRING. STRING is zero terminated. */
-/* */
-/* **************************************************************** */
-
-static int
-yy_string_get ()
-{
- register char *string;
- register unsigned char c;
-
- string = bash_input.location.string;
-
- /* If the string doesn't exist, or is empty, EOF found. */
- if (string && *string)
- {
- c = *string++;
- bash_input.location.string = string;
- return (c);
- }
- else
- return (EOF);
-}
-
-static int
-yy_string_unget (c)
- int c;
-{
- *(--bash_input.location.string) = c;
- return (c);
-}
-
-void
-with_input_from_string (string, name)
- char *string;
- const char *name;
-{
- INPUT_STREAM location;
-
- location.string = string;
- init_yy_io (yy_string_get, yy_string_unget, st_string, name, location);
-}
-
-/* Count the number of characters we've consumed from bash_input.location.string
- and read into shell_input_line, but have not returned from shell_getc.
- That is the true input location. Rewind bash_input.location.string by
- that number of characters, so it points to the last character actually
- consumed by the parser. */
-static void
-rewind_input_string ()
-{
- int xchars;
-
- /* number of unconsumed characters in the input -- XXX need to take newlines
- into account, e.g., $(...\n) */
- xchars = shell_input_line_len - shell_input_line_index;
- if (bash_input.location.string[-1] == '\n')
- xchars++;
-
- /* XXX - how to reflect bash_input.location.string back to string passed to
- parse_and_execute or xparse_dolparen? xparse_dolparen needs to know how
- far into the string we parsed. parse_and_execute knows where bash_input.
- location.string is, and how far from orig_string that is -- that's the
- number of characters the command consumed. */
-
- /* bash_input.location.string - xchars should be where we parsed to */
- /* need to do more validation on xchars value for sanity -- test cases. */
- bash_input.location.string -= xchars;
-}
-
-/* **************************************************************** */
-/* */
-/* Let input come from STREAM. */
-/* */
-/* **************************************************************** */
-
-/* These two functions used to test the value of the HAVE_RESTARTABLE_SYSCALLS
- define, and just use getc/ungetc if it was defined, but since bash
- installs its signal handlers without the SA_RESTART flag, some signals
- (like SIGCHLD, SIGWINCH, etc.) received during a read(2) will not cause
- the read to be restarted. We need to restart it ourselves. */
-
-static int
-yy_stream_get ()
-{
- int result;
-
- result = EOF;
- if (bash_input.location.file)
- {
-#if 0
- if (interactive)
- interrupt_immediately++;
-#endif
-
- /* XXX - don't need terminate_immediately; getc_with_restart checks
- for terminating signals itself if read returns < 0 */
- result = getc_with_restart (bash_input.location.file);
-
-#if 0
- if (interactive)
- interrupt_immediately--;
-#endif
- }
- return (result);
-}
-
-static int
-yy_stream_unget (c)
- int c;
-{
- return (ungetc_with_restart (c, bash_input.location.file));
-}
-
-void
-with_input_from_stream (stream, name)
- FILE *stream;
- const char *name;
-{
- INPUT_STREAM location;
-
- location.file = stream;
- init_yy_io (yy_stream_get, yy_stream_unget, st_stream, name, location);
-}
-
-typedef struct stream_saver {
- struct stream_saver *next;
- BASH_INPUT bash_input;
- int line;
-#if defined (BUFFERED_INPUT)
- BUFFERED_STREAM *bstream;
-#endif /* BUFFERED_INPUT */
-} STREAM_SAVER;
-
-/* The globally known line number. */
-int line_number = 0;
-
-/* The line number offset set by assigning to LINENO. Not currently used. */
-int line_number_base = 0;
-
-#if defined (COND_COMMAND)
-static int cond_lineno;
-static int cond_token;
-#endif
-
-STREAM_SAVER *stream_list = (STREAM_SAVER *)NULL;
-
-void
-push_stream (reset_lineno)
- int reset_lineno;
-{
- STREAM_SAVER *saver = (STREAM_SAVER *)xmalloc (sizeof (STREAM_SAVER));
-
- xbcopy ((char *)&bash_input, (char *)&(saver->bash_input), sizeof (BASH_INPUT));
-
-#if defined (BUFFERED_INPUT)
- saver->bstream = (BUFFERED_STREAM *)NULL;
- /* If we have a buffered stream, clear out buffers[fd]. */
- if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0)
- saver->bstream = set_buffered_stream (bash_input.location.buffered_fd,
- (BUFFERED_STREAM *)NULL);
-#endif /* BUFFERED_INPUT */
-
- saver->line = line_number;
- bash_input.name = (char *)NULL;
- saver->next = stream_list;
- stream_list = saver;
- EOF_Reached = 0;
- if (reset_lineno)
- line_number = 0;
-}
-
-void
-pop_stream ()
-{
- if (!stream_list)
- EOF_Reached = 1;
- else
- {
- STREAM_SAVER *saver = stream_list;
-
- EOF_Reached = 0;
- stream_list = stream_list->next;
-
- init_yy_io (saver->bash_input.getter,
- saver->bash_input.ungetter,
- saver->bash_input.type,
- saver->bash_input.name,
- saver->bash_input.location);
-
-#if defined (BUFFERED_INPUT)
- /* If we have a buffered stream, restore buffers[fd]. */
- /* If the input file descriptor was changed while this was on the
- save stack, update the buffered fd to the new file descriptor and
- re-establish the buffer <-> bash_input fd correspondence. */
- if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0)
- {
- if (bash_input_fd_changed)
- {
- bash_input_fd_changed = 0;
- if (default_buffered_input >= 0)
- {
- bash_input.location.buffered_fd = default_buffered_input;
- saver->bstream->b_fd = default_buffered_input;
- SET_CLOSE_ON_EXEC (default_buffered_input);
- }
- }
- /* XXX could free buffered stream returned as result here. */
- set_buffered_stream (bash_input.location.buffered_fd, saver->bstream);
- }
-#endif /* BUFFERED_INPUT */
-
- line_number = saver->line;
-
- FREE (saver->bash_input.name);
- free (saver);
- }
-}
-
-/* Return 1 if a stream of type TYPE is saved on the stack. */
-int
-stream_on_stack (type)
- enum stream_type type;
-{
- register STREAM_SAVER *s;
-
- for (s = stream_list; s; s = s->next)
- if (s->bash_input.type == type)
- return 1;
- return 0;
-}
-
-/* Save the current token state and return it in a malloced array. */
-int *
-save_token_state ()
-{
- int *ret;
-
- ret = (int *)xmalloc (4 * sizeof (int));
- ret[0] = last_read_token;
- ret[1] = token_before_that;
- ret[2] = two_tokens_ago;
- ret[3] = current_token;
- return ret;
-}
-
-void
-restore_token_state (ts)
- int *ts;
-{
- if (ts == 0)
- return;
- last_read_token = ts[0];
- token_before_that = ts[1];
- two_tokens_ago = ts[2];
- current_token = ts[3];
-}
-
-/*
- * This is used to inhibit alias expansion and reserved word recognition
- * inside case statement pattern lists. A `case statement pattern list' is:
- *
- * everything between the `in' in a `case word in' and the next ')'
- * or `esac'
- * everything between a `;;' and the next `)' or `esac'
- */
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
-
-#define END_OF_ALIAS 0
-
-/*
- * Pseudo-global variables used in implementing token-wise alias expansion.
- */
-
-/*
- * Pushing and popping strings. This works together with shell_getc to
- * implement alias expansion on a per-token basis.
- */
-
-#define PSH_ALIAS 0x01
-#define PSH_DPAREN 0x02
-#define PSH_SOURCE 0x04
-
-typedef struct string_saver {
- struct string_saver *next;
- int expand_alias; /* Value to set expand_alias to when string is popped. */
- char *saved_line;
-#if defined (ALIAS)
- alias_t *expander; /* alias that caused this line to be pushed. */
-#endif
- size_t saved_line_size, saved_line_index;
- int saved_line_terminator;
- int flags;
-} STRING_SAVER;
-
-STRING_SAVER *pushed_string_list = (STRING_SAVER *)NULL;
-
-/*
- * Push the current shell_input_line onto a stack of such lines and make S
- * the current input. Used when expanding aliases. EXPAND is used to set
- * the value of expand_next_token when the string is popped, so that the
- * word after the alias in the original line is handled correctly when the
- * alias expands to multiple words. TOKEN is the token that was expanded
- * into S; it is saved and used to prevent infinite recursive expansion.
- */
-static void
-push_string (s, expand, ap)
- char *s;
- int expand;
- alias_t *ap;
-{
- STRING_SAVER *temp = (STRING_SAVER *)xmalloc (sizeof (STRING_SAVER));
-
- temp->expand_alias = expand;
- temp->saved_line = shell_input_line;
- temp->saved_line_size = shell_input_line_size;
- temp->saved_line_index = shell_input_line_index;
- temp->saved_line_terminator = shell_input_line_terminator;
- temp->flags = 0;
-#if defined (ALIAS)
- temp->expander = ap;
- if (ap)
- temp->flags = PSH_ALIAS;
-#endif
- temp->next = pushed_string_list;
- pushed_string_list = temp;
-
-#if defined (ALIAS)
- if (ap)
- ap->flags |= AL_BEINGEXPANDED;
-#endif
-
- shell_input_line = s;
- shell_input_line_size = STRLEN (s);
- shell_input_line_index = 0;
- shell_input_line_terminator = '\0';
-#if 0
- parser_state &= ~PST_ALEXPNEXT; /* XXX */
-#endif
-
- set_line_mbstate ();
-}
-
-/*
- * Make the top of the pushed_string stack be the current shell input.
- * Only called when there is something on the stack. Called from shell_getc
- * when it thinks it has consumed the string generated by an alias expansion
- * and needs to return to the original input line.
- */
-static void
-pop_string ()
-{
- STRING_SAVER *t;
-
- FREE (shell_input_line);
- shell_input_line = pushed_string_list->saved_line;
- shell_input_line_index = pushed_string_list->saved_line_index;
- shell_input_line_size = pushed_string_list->saved_line_size;
- shell_input_line_terminator = pushed_string_list->saved_line_terminator;
-
- if (pushed_string_list->expand_alias)
- parser_state |= PST_ALEXPNEXT;
- else
- parser_state &= ~PST_ALEXPNEXT;
-
- t = pushed_string_list;
- pushed_string_list = pushed_string_list->next;
-
-#if defined (ALIAS)
- if (t->expander)
- t->expander->flags &= ~AL_BEINGEXPANDED;
-#endif
-
- free ((char *)t);
-
- set_line_mbstate ();
-}
-
-static void
-free_string_list ()
-{
- register STRING_SAVER *t, *t1;
-
- for (t = pushed_string_list; t; )
- {
- t1 = t->next;
- FREE (t->saved_line);
-#if defined (ALIAS)
- if (t->expander)
- t->expander->flags &= ~AL_BEINGEXPANDED;
-#endif
- free ((char *)t);
- t = t1;
- }
- pushed_string_list = (STRING_SAVER *)NULL;
-}
-
-#endif /* ALIAS || DPAREN_ARITHMETIC */
-
-void
-free_pushed_string_input ()
-{
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- free_string_list ();
-#endif
-}
-
-int
-parser_expanding_alias ()
-{
- return (expanding_alias ());
-}
-
-void
-parser_save_alias ()
-{
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- push_string ((char *)NULL, 0, (alias_t *)NULL);
- pushed_string_list->flags = PSH_SOURCE; /* XXX - for now */
-#else
- ;
-#endif
-}
-
-void
-parser_restore_alias ()
-{
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- if (pushed_string_list)
- pop_string ();
-#else
- ;
-#endif
-}
-
-/* Return a line of text, taken from wherever yylex () reads input.
- If there is no more input, then we return NULL. If REMOVE_QUOTED_NEWLINE
- is non-zero, we remove unquoted \<newline> pairs. This is used by
- read_secondary_line to read here documents. */
-static char *
-read_a_line (remove_quoted_newline)
- int remove_quoted_newline;
-{
- static char *line_buffer = (char *)NULL;
- static int buffer_size = 0;
- int indx, c, peekc, pass_next;
-
-#if defined (READLINE)
- if (no_line_editing && SHOULD_PROMPT ())
-#else
- if (SHOULD_PROMPT ())
-#endif
- print_prompt ();
-
- pass_next = indx = 0;
- while (1)
- {
- /* Allow immediate exit if interrupted during input. */
- QUIT;
-
- c = yy_getc ();
-
- /* Ignore null bytes in input. */
- if (c == 0)
- {
-#if 0
- internal_warning ("read_a_line: ignored null byte in input");
-#endif
- continue;
- }
-
- /* If there is no more input, then we return NULL. */
- if (c == EOF)
- {
- if (interactive && bash_input.type == st_stream)
- clearerr (stdin);
- if (indx == 0)
- return ((char *)NULL);
- c = '\n';
- }
-
- /* `+2' in case the final character in the buffer is a newline. */
- RESIZE_MALLOCED_BUFFER (line_buffer, indx, 2, buffer_size, 128);
-
- /* IF REMOVE_QUOTED_NEWLINES is non-zero, we are reading a
- here document with an unquoted delimiter. In this case,
- the line will be expanded as if it were in double quotes.
- We allow a backslash to escape the next character, but we
- need to treat the backslash specially only if a backslash
- quoting a backslash-newline pair appears in the line. */
- if (pass_next)
- {
- line_buffer[indx++] = c;
- pass_next = 0;
- }
- else if (c == '\\' && remove_quoted_newline)
- {
- QUIT;
- peekc = yy_getc ();
- if (peekc == '\n')
- {
- line_number++;
- continue; /* Make the unquoted \<newline> pair disappear. */
- }
- else
- {
- yy_ungetc (peekc);
- pass_next = 1;
- line_buffer[indx++] = c; /* Preserve the backslash. */
- }
- }
- else
- line_buffer[indx++] = c;
-
- if (c == '\n')
- {
- line_buffer[indx] = '\0';
- return (line_buffer);
- }
- }
-}
-
-/* Return a line as in read_a_line (), but insure that the prompt is
- the secondary prompt. This is used to read the lines of a here
- document. REMOVE_QUOTED_NEWLINE is non-zero if we should remove
- newlines quoted with backslashes while reading the line. It is
- non-zero unless the delimiter of the here document was quoted. */
-char *
-read_secondary_line (remove_quoted_newline)
- int remove_quoted_newline;
-{
- char *ret;
- int n, c;
-
- prompt_string_pointer = &ps2_prompt;
- if (SHOULD_PROMPT())
- prompt_again ();
- ret = read_a_line (remove_quoted_newline);
-#if defined (HISTORY)
- if (ret && remember_on_history && (parser_state & PST_HEREDOC))
- {
- /* To make adding the here-document body right, we need to rely on
- history_delimiting_chars() returning \n for the first line of the
- here-document body and the null string for the second and subsequent
- lines, so we avoid double newlines.
- current_command_line_count == 2 for the first line of the body. */
-
- current_command_line_count++;
- maybe_add_history (ret);
- }
-#endif /* HISTORY */
- return ret;
-}
-
-/* **************************************************************** */
-/* */
-/* YYLEX () */
-/* */
-/* **************************************************************** */
-
-/* Reserved words. These are only recognized as the first word of a
- command. */
-STRING_INT_ALIST word_token_alist[] = {
- { "if", IF },
- { "then", THEN },
- { "else", ELSE },
- { "elif", ELIF },
- { "fi", FI },
- { "case", CASE },
- { "esac", ESAC },
- { "for", FOR },
-#if defined (SELECT_COMMAND)
- { "select", SELECT },
-#endif
- { "while", WHILE },
- { "until", UNTIL },
- { "do", DO },
- { "done", DONE },
- { "in", IN },
- { "function", FUNCTION },
-#if defined (COMMAND_TIMING)
- { "time", TIME },
-#endif
- { "{", '{' },
- { "}", '}' },
- { "!", BANG },
-#if defined (COND_COMMAND)
- { "[[", COND_START },
- { "]]", COND_END },
-#endif
-#if defined (COPROCESS_SUPPORT)
- { "coproc", COPROC },
-#endif
- { (char *)NULL, 0}
-};
-
-/* other tokens that can be returned by read_token() */
-STRING_INT_ALIST other_token_alist[] = {
- /* Multiple-character tokens with special values */
- { "--", TIMEIGN },
- { "-p", TIMEOPT },
- { "&&", AND_AND },
- { "||", OR_OR },
- { ">>", GREATER_GREATER },
- { "<<", LESS_LESS },
- { "<&", LESS_AND },
- { ">&", GREATER_AND },
- { ";;", SEMI_SEMI },
- { ";&", SEMI_AND },
- { ";;&", SEMI_SEMI_AND },
- { "<<-", LESS_LESS_MINUS },
- { "<<<", LESS_LESS_LESS },
- { "&>", AND_GREATER },
- { "&>>", AND_GREATER_GREATER },
- { "<>", LESS_GREATER },
- { ">|", GREATER_BAR },
- { "|&", BAR_AND },
- { "EOF", yacc_EOF },
- /* Tokens whose value is the character itself */
- { ">", '>' },
- { "<", '<' },
- { "-", '-' },
- { "{", '{' },
- { "}", '}' },
- { ";", ';' },
- { "(", '(' },
- { ")", ')' },
- { "|", '|' },
- { "&", '&' },
- { "newline", '\n' },
- { (char *)NULL, 0}
-};
-
-/* others not listed here:
- WORD look at yylval.word
- ASSIGNMENT_WORD look at yylval.word
- NUMBER look at yylval.number
- ARITH_CMD look at yylval.word_list
- ARITH_FOR_EXPRS look at yylval.word_list
- COND_CMD look at yylval.command
-*/
-
-/* These are used by read_token_word, but appear up here so that shell_getc
- can use them to decide when to add otherwise blank lines to the history. */
-
-/* The primary delimiter stack. */
-struct dstack dstack = { (char *)NULL, 0, 0 };
-
-/* A temporary delimiter stack to be used when decoding prompt strings.
- This is needed because command substitutions in prompt strings (e.g., PS2)
- can screw up the parser's quoting state. */
-static struct dstack temp_dstack = { (char *)NULL, 0, 0 };
-
-/* Macro for accessing the top delimiter on the stack. Returns the
- delimiter or zero if none. */
-#define current_delimiter(ds) \
- (ds.delimiter_depth ? ds.delimiters[ds.delimiter_depth - 1] : 0)
-
-#define push_delimiter(ds, character) \
- do \
- { \
- if (ds.delimiter_depth + 2 > ds.delimiter_space) \
- ds.delimiters = (char *)xrealloc \
- (ds.delimiters, (ds.delimiter_space += 10) * sizeof (char)); \
- ds.delimiters[ds.delimiter_depth] = character; \
- ds.delimiter_depth++; \
- } \
- while (0)
-
-#define pop_delimiter(ds) ds.delimiter_depth--
-
-/* Return the next shell input character. This always reads characters
- from shell_input_line; when that line is exhausted, it is time to
- read the next line. This is called by read_token when the shell is
- processing normal command input. */
-
-/* This implements one-character lookahead/lookbehind across physical input
- lines, to avoid something being lost because it's pushed back with
- shell_ungetc when we're at the start of a line. */
-static int eol_ungetc_lookahead = 0;
-
-static int
-shell_getc (remove_quoted_newline)
- int remove_quoted_newline;
-{
- register int i;
- int c, truncating;
- unsigned char uc;
-
- QUIT;
-
- if (sigwinch_received)
- {
- sigwinch_received = 0;
- get_new_window_size (0, (int *)0, (int *)0);
- }
-
- if (eol_ungetc_lookahead)
- {
- c = eol_ungetc_lookahead;
- eol_ungetc_lookahead = 0;
- return (c);
- }
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- /* If shell_input_line[shell_input_line_index] == 0, but there is
- something on the pushed list of strings, then we don't want to go
- off and get another line. We let the code down below handle it. */
-
- if (!shell_input_line || ((!shell_input_line[shell_input_line_index]) &&
- (pushed_string_list == (STRING_SAVER *)NULL)))
-#else /* !ALIAS && !DPAREN_ARITHMETIC */
- if (!shell_input_line || !shell_input_line[shell_input_line_index])
-#endif /* !ALIAS && !DPAREN_ARITHMETIC */
- {
- line_number++;
-
- /* Let's not let one really really long line blow up memory allocation */
- if (shell_input_line && shell_input_line_size >= 32768)
- {
- free (shell_input_line);
- shell_input_line = 0;
- shell_input_line_size = 0;
- }
-
- restart_read:
-
- /* Allow immediate exit if interrupted during input. */
- QUIT;
-
- i = truncating = 0;
- shell_input_line_terminator = 0;
-
- /* If the shell is interatctive, but not currently printing a prompt
- (interactive_shell && interactive == 0), we don't want to print
- notifies or cleanup the jobs -- we want to defer it until we do
- print the next prompt. */
- if (interactive_shell == 0 || SHOULD_PROMPT())
- {
-#if defined (JOB_CONTROL)
- /* This can cause a problem when reading a command as the result
- of a trap, when the trap is called from flush_child. This call
- had better not cause jobs to disappear from the job table in
- that case, or we will have big trouble. */
- notify_and_cleanup ();
-#else /* !JOB_CONTROL */
- cleanup_dead_jobs ();
-#endif /* !JOB_CONTROL */
- }
-
-#if defined (READLINE)
- if (no_line_editing && SHOULD_PROMPT())
-#else
- if (SHOULD_PROMPT())
-#endif
- print_prompt ();
-
- if (bash_input.type == st_stream)
- clearerr (stdin);
-
- while (1)
- {
- c = yy_getc ();
-
- /* Allow immediate exit if interrupted during input. */
- QUIT;
-
- if (c == '\0')
- {
-#if 0
- internal_warning ("shell_getc: ignored null byte in input");
-#endif
- continue;
- }
-
- /* Theoretical overflow */
- /* If we can't put 256 bytes more into the buffer, allocate
- everything we can and fill it as full as we can. */
- /* XXX - we ignore rest of line using `truncating' flag */
- if (shell_input_line_size > (SIZE_MAX - 256))
- {
- size_t n;
-
- n = SIZE_MAX - i; /* how much more can we put into the buffer? */
- if (n <= 2) /* we have to save 1 for the newline added below */
- {
- if (truncating == 0)
- internal_warning("shell_getc: shell_input_line_size (%zu) exceeds SIZE_MAX (%llu): line truncated", shell_input_line_size, SIZE_MAX);
- shell_input_line[i] = '\0';
- truncating = 1;
- }
- if (shell_input_line_size < SIZE_MAX)
- {
- shell_input_line_size = SIZE_MAX;
- shell_input_line = xrealloc (shell_input_line, shell_input_line_size);
- }
- }
- else
- RESIZE_MALLOCED_BUFFER (shell_input_line, i, 2, shell_input_line_size, 256);
-
- if (c == EOF)
- {
- if (bash_input.type == st_stream)
- clearerr (stdin);
-
- if (i == 0)
- shell_input_line_terminator = EOF;
-
- shell_input_line[i] = '\0';
- break;
- }
-
- if (truncating == 0 || c == '\n')
- shell_input_line[i++] = c;
-
- if (c == '\n')
- {
- shell_input_line[--i] = '\0';
- current_command_line_count++;
- break;
- }
- }
-
- shell_input_line_index = 0;
- shell_input_line_len = i; /* == strlen (shell_input_line) */
-
- set_line_mbstate ();
-
-#if defined (HISTORY)
- if (remember_on_history && shell_input_line && shell_input_line[0])
- {
- char *expansions;
-# if defined (BANG_HISTORY)
- int old_hist;
-
- /* If the current delimiter is a single quote, we should not be
- performing history expansion, even if we're on a different
- line from the original single quote. */
- old_hist = history_expansion_inhibited;
- if (current_delimiter (dstack) == '\'')
- history_expansion_inhibited = 1;
-# endif
- expansions = pre_process_line (shell_input_line, 1, 1);
-# if defined (BANG_HISTORY)
- history_expansion_inhibited = old_hist;
-# endif
- if (expansions != shell_input_line)
- {
- free (shell_input_line);
- shell_input_line = expansions;
- shell_input_line_len = shell_input_line ?
- strlen (shell_input_line) : 0;
- if (shell_input_line_len == 0)
- current_command_line_count--;
-
- /* We have to force the xrealloc below because we don't know
- the true allocated size of shell_input_line anymore. */
- shell_input_line_size = shell_input_line_len;
-
- set_line_mbstate ();
- }
- }
- /* Try to do something intelligent with blank lines encountered while
- entering multi-line commands. XXX - this is grotesque */
- else if (remember_on_history && shell_input_line &&
- shell_input_line[0] == '\0' &&
- current_command_line_count > 1)
- {
- if (current_delimiter (dstack))
- /* We know shell_input_line[0] == 0 and we're reading some sort of
- quoted string. This means we've got a line consisting of only
- a newline in a quoted string. We want to make sure this line
- gets added to the history. */
- maybe_add_history (shell_input_line);
- else
- {
- char *hdcs;
- hdcs = history_delimiting_chars (shell_input_line);
- if (hdcs && hdcs[0] == ';')
- maybe_add_history (shell_input_line);
- }
- }
-
-#endif /* HISTORY */
-
- if (shell_input_line)
- {
- /* Lines that signify the end of the shell's input should not be
- echoed. We should not echo lines while parsing command
- substitutions with recursive calls into the parsing engine; those
- should only be echoed once when we read the word. That is the
- reason for the test against shell_eof_token, which is set to a
- right paren when parsing the contents of command substitutions. */
- if (echo_input_at_read && (shell_input_line[0] ||
- shell_input_line_terminator != EOF) &&
- shell_eof_token == 0)
- fprintf (stderr, "%s\n", shell_input_line);
- }
- else
- {
- shell_input_line_size = 0;
- prompt_string_pointer = ¤t_prompt_string;
- if (SHOULD_PROMPT ())
- prompt_again ();
- goto restart_read;
- }
-
- /* Add the newline to the end of this string, iff the string does
- not already end in an EOF character. */
- if (shell_input_line_terminator != EOF)
- {
- if (shell_input_line_size < SIZE_MAX-3 && (shell_input_line_len+3 > shell_input_line_size))
- shell_input_line = (char *)xrealloc (shell_input_line,
- 1 + (shell_input_line_size += 2));
-
- shell_input_line[shell_input_line_len] = '\n';
- shell_input_line[shell_input_line_len + 1] = '\0';
-
- set_line_mbstate ();
- }
- }
-
-next_alias_char:
- uc = shell_input_line[shell_input_line_index];
-
- if (uc)
- shell_input_line_index++;
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- /* If UC is NULL, we have reached the end of the current input string. If
- pushed_string_list is non-empty, it's time to pop to the previous string
- because we have fully consumed the result of the last alias expansion.
- Do it transparently; just return the next character of the string popped
- to. */
- /* If pushed_string_list != 0 but pushed_string_list->expander == 0 (not
- currently tested) and the flags value is not PSH_SOURCE, we are not
- parsing an alias, we have just saved one (push_string, when called by
- the parse_dparen code) In this case, just go on as well. The PSH_SOURCE
- case is handled below. */
-pop_alias:
- if (uc == 0 && pushed_string_list && pushed_string_list->flags != PSH_SOURCE)
- {
- pop_string ();
- uc = shell_input_line[shell_input_line_index];
- if (uc)
- shell_input_line_index++;
- }
-#endif /* ALIAS || DPAREN_ARITHMETIC */
-
- if MBTEST(uc == '\\' && remove_quoted_newline && shell_input_line[shell_input_line_index] == '\n')
- {
- if (SHOULD_PROMPT ())
- prompt_again ();
- line_number++;
- /* What do we do here if we're expanding an alias whose definition
- includes an escaped newline? If that's the last character in the
- alias expansion, we just pop the pushed string list (recall that
- we inhibit the appending of a space in mk_alexpansion() if newline
- is the last character). If it's not the last character, we need
- to consume the quoted newline and move to the next character in
- the expansion. */
-#if defined (ALIAS)
- if (expanding_alias () && shell_input_line[shell_input_line_index+1] == '\0')
- {
- uc = 0;
- goto pop_alias;
- }
- else if (expanding_alias () && shell_input_line[shell_input_line_index+1] != '\0')
- {
- shell_input_line_index++; /* skip newline */
- goto next_alias_char; /* and get next character */
- }
- else
-#endif
- goto restart_read;
- }
-
- if (uc == 0 && shell_input_line_terminator == EOF)
- return ((shell_input_line_index != 0) ? '\n' : EOF);
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- /* We already know that we are not parsing an alias expansion because of the
- check for expanding_alias() above. This knows how parse_and_execute
- handles switching to st_string input while an alias is being expanded,
- hence the check for pushed_string_list without pushed_string_list->expander
- and the check for PSH_SOURCE as pushed_string_list->flags.
- parse_and_execute and parse_string both change the input type to st_string
- and place the string to be parsed and executed into location.string, so
- we should not stop reading that until the pointer is '\0'.
- The check for shell_input_line_terminator may be superfluous.
-
- This solves the problem of `.' inside a multi-line alias with embedded
- newlines executing things out of order. */
- if (uc == 0 && bash_input.type == st_string && *bash_input.location.string &&
- pushed_string_list && pushed_string_list->flags == PSH_SOURCE &&
- shell_input_line_terminator == 0)
- {
- shell_input_line_index = 0;
- goto restart_read;
- }
-#endif
-
- return (uc);
-}
-
-/* Put C back into the input for the shell. This might need changes for
- HANDLE_MULTIBYTE around EOLs. Since we (currently) never push back a
- character different than we read, shell_input_line_property doesn't need
- to change when manipulating shell_input_line. The define for
- last_shell_getc_is_singlebyte should take care of it, though. */
-static void
-shell_ungetc (c)
- int c;
-{
- if (shell_input_line && shell_input_line_index)
- shell_input_line[--shell_input_line_index] = c;
- else
- eol_ungetc_lookahead = c;
-}
-
-#ifdef INCLUDE_UNUSED
-/* Back the input pointer up by one, effectively `ungetting' a character. */
-static void
-shell_ungetchar ()
-{
- if (shell_input_line && shell_input_line_index)
- shell_input_line_index--;
-}
-#endif
-
-/* Discard input until CHARACTER is seen, then push that character back
- onto the input stream. */
-static void
-discard_until (character)
- int character;
-{
- int c;
-
- while ((c = shell_getc (0)) != EOF && c != character)
- ;
-
- if (c != EOF)
- shell_ungetc (c);
-}
-
-void
-execute_variable_command (command, vname)
- char *command, *vname;
-{
- char *last_lastarg;
- sh_parser_state_t ps;
-
- save_parser_state (&ps);
- last_lastarg = get_string_value ("_");
- if (last_lastarg)
- last_lastarg = savestring (last_lastarg);
-
- parse_and_execute (savestring (command), vname, SEVAL_NONINT|SEVAL_NOHIST);
-
- restore_parser_state (&ps);
- bind_variable ("_", last_lastarg, 0);
- FREE (last_lastarg);
-
- if (token_to_read == '\n') /* reset_parser was called */
- token_to_read = 0;
-}
-
-/* Place to remember the token. We try to keep the buffer
- at a reasonable size, but it can grow. */
-static char *token = (char *)NULL;
-
-/* Current size of the token buffer. */
-static int token_buffer_size;
-
-/* Command to read_token () explaining what we want it to do. */
-#define READ 0
-#define RESET 1
-#define prompt_is_ps1 \
- (!prompt_string_pointer || prompt_string_pointer == &ps1_prompt)
-
-/* Function for yyparse to call. yylex keeps track of
- the last two tokens read, and calls read_token. */
-static int
-yylex ()
-{
- if (interactive && (current_token == 0 || current_token == '\n'))
- {
- /* Before we print a prompt, we might have to check mailboxes.
- We do this only if it is time to do so. Notice that only here
- is the mail alarm reset; nothing takes place in check_mail ()
- except the checking of mail. Please don't change this. */
- if (prompt_is_ps1 && parse_and_execute_level == 0 && time_to_check_mail ())
- {
- check_mail ();
- reset_mail_timer ();
- }
-
- /* Avoid printing a prompt if we're not going to read anything, e.g.
- after resetting the parser with read_token (RESET). */
- if (token_to_read == 0 && SHOULD_PROMPT ())
- prompt_again ();
- }
-
- two_tokens_ago = token_before_that;
- token_before_that = last_read_token;
- last_read_token = current_token;
- current_token = read_token (READ);
-
- if ((parser_state & PST_EOFTOKEN) && current_token == shell_eof_token)
- {
- current_token = yacc_EOF;
- if (bash_input.type == st_string)
- rewind_input_string ();
- }
- parser_state &= ~PST_EOFTOKEN;
-
- return (current_token);
-}
-
-/* When non-zero, we have read the required tokens
- which allow ESAC to be the next one read. */
-static int esacs_needed_count;
-
-void
-gather_here_documents ()
-{
- int r;
-
- r = 0;
- while (need_here_doc > 0)
- {
- parser_state |= PST_HEREDOC;
- make_here_document (redir_stack[r++], line_number);
- parser_state &= ~PST_HEREDOC;
- need_here_doc--;
- }
-}
-
-/* When non-zero, an open-brace used to create a group is awaiting a close
- brace partner. */
-static int open_brace_count;
-
-#define command_token_position(token) \
- (((token) == ASSIGNMENT_WORD) || (parser_state&PST_REDIRLIST) || \
- ((token) != SEMI_SEMI && (token) != SEMI_AND && (token) != SEMI_SEMI_AND && reserved_word_acceptable(token)))
-
-#define assignment_acceptable(token) \
- (command_token_position(token) && ((parser_state & PST_CASEPAT) == 0))
-
-/* Check to see if TOKEN is a reserved word and return the token
- value if it is. */
-#define CHECK_FOR_RESERVED_WORD(tok) \
- do { \
- if (!dollar_present && !quoted && \
- reserved_word_acceptable (last_read_token)) \
- { \
- int i; \
- for (i = 0; word_token_alist[i].word != (char *)NULL; i++) \
- if (STREQ (tok, word_token_alist[i].word)) \
- { \
- if ((parser_state & PST_CASEPAT) && (word_token_alist[i].token != ESAC)) \
- break; \
- if (word_token_alist[i].token == TIME && time_command_acceptable () == 0) \
- break; \
- if (word_token_alist[i].token == ESAC) \
- parser_state &= ~(PST_CASEPAT|PST_CASESTMT); \
- else if (word_token_alist[i].token == CASE) \
- parser_state |= PST_CASESTMT; \
- else if (word_token_alist[i].token == COND_END) \
- parser_state &= ~(PST_CONDCMD|PST_CONDEXPR); \
- else if (word_token_alist[i].token == COND_START) \
- parser_state |= PST_CONDCMD; \
- else if (word_token_alist[i].token == '{') \
- open_brace_count++; \
- else if (word_token_alist[i].token == '}' && open_brace_count) \
- open_brace_count--; \
- return (word_token_alist[i].token); \
- } \
- } \
- } while (0)
-
-#if defined (ALIAS)
-
- /* OK, we have a token. Let's try to alias expand it, if (and only if)
- it's eligible.
-
- It is eligible for expansion if EXPAND_ALIASES is set, and
- the token is unquoted and the last token read was a command
- separator (or expand_next_token is set), and we are currently
- processing an alias (pushed_string_list is non-empty) and this
- token is not the same as the current or any previously
- processed alias.
-
- Special cases that disqualify:
- In a pattern list in a case statement (parser_state & PST_CASEPAT). */
-
-static char *
-mk_alexpansion (s)
- char *s;
-{
- int l;
- char *r;
-
- l = strlen (s);
- r = xmalloc (l + 2);
- strcpy (r, s);
- /* If the last character in the alias is a newline, don't add a trailing
- space to the expansion. Works with shell_getc above. */
- if (r[l - 1] != ' ' && r[l - 1] != '\n')
- r[l++] = ' ';
- r[l] = '\0';
- return r;
-}
-
-static int
-alias_expand_token (tokstr)
- char *tokstr;
-{
- char *expanded;
- alias_t *ap;
-
- if (((parser_state & PST_ALEXPNEXT) || command_token_position (last_read_token)) &&
- (parser_state & PST_CASEPAT) == 0)
- {
- ap = find_alias (tokstr);
-
- /* Currently expanding this token. */
- if (ap && (ap->flags & AL_BEINGEXPANDED))
- return (NO_EXPANSION);
-
- /* mk_alexpansion puts an extra space on the end of the alias expansion,
- so the lookahead by the parser works right. If this gets changed,
- make sure the code in shell_getc that deals with reaching the end of
- an expanded alias is changed with it. */
- expanded = ap ? mk_alexpansion (ap->value) : (char *)NULL;
-
- if (expanded)
- {
- push_string (expanded, ap->flags & AL_EXPANDNEXT, ap);
- return (RE_READ_TOKEN);
- }
- else
- /* This is an eligible token that does not have an expansion. */
- return (NO_EXPANSION);
- }
- return (NO_EXPANSION);
-}
-#endif /* ALIAS */
-
-static int
-time_command_acceptable ()
-{
-#if defined (COMMAND_TIMING)
- int i;
-
- if (posixly_correct && shell_compatibility_level > 41)
- {
- /* Quick check of the rest of the line to find the next token. If it
- begins with a `-', Posix says to not return `time' as the token.
- This was interp 267. */
- i = shell_input_line_index;
- while (i < shell_input_line_len && (shell_input_line[i] == ' ' || shell_input_line[i] == '\t'))
- i++;
- if (shell_input_line[i] == '-')
- return 0;
- }
-
- switch (last_read_token)
- {
- case 0:
- case ';':
- case '\n':
- case AND_AND:
- case OR_OR:
- case '&':
- case WHILE:
- case DO:
- case UNTIL:
- case IF:
- case THEN:
- case ELIF:
- case ELSE:
- case '{': /* } */
- case '(': /* )( */
- case ')': /* only valid in case statement */
- case BANG: /* ! time pipeline */
- case TIME: /* time time pipeline */
- case TIMEOPT: /* time -p time pipeline */
- case TIMEIGN: /* time -p -- ... */
- return 1;
- default:
- return 0;
- }
-#else
- return 0;
-#endif /* COMMAND_TIMING */
-}
-
-/* Handle special cases of token recognition:
- IN is recognized if the last token was WORD and the token
- before that was FOR or CASE or SELECT.
-
- DO is recognized if the last token was WORD and the token
- before that was FOR or SELECT.
-
- ESAC is recognized if the last token caused `esacs_needed_count'
- to be set
-
- `{' is recognized if the last token as WORD and the token
- before that was FUNCTION, or if we just parsed an arithmetic
- `for' command.
-
- `}' is recognized if there is an unclosed `{' present.
-
- `-p' is returned as TIMEOPT if the last read token was TIME.
- `--' is returned as TIMEIGN if the last read token was TIMEOPT.
-
- ']]' is returned as COND_END if the parser is currently parsing
- a conditional expression ((parser_state & PST_CONDEXPR) != 0)
-
- `time' is returned as TIME if and only if it is immediately
- preceded by one of `;', `\n', `||', `&&', or `&'.
-*/
-
-static int
-special_case_tokens (tokstr)
- char *tokstr;
-{
- if ((last_read_token == WORD) &&
-#if defined (SELECT_COMMAND)
- ((token_before_that == FOR) || (token_before_that == CASE) || (token_before_that == SELECT)) &&
-#else
- ((token_before_that == FOR) || (token_before_that == CASE)) &&
-#endif
- (tokstr[0] == 'i' && tokstr[1] == 'n' && tokstr[2] == 0))
- {
- if (token_before_that == CASE)
- {
- parser_state |= PST_CASEPAT;
- esacs_needed_count++;
- }
- return (IN);
- }
-
- if (last_read_token == WORD &&
-#if defined (SELECT_COMMAND)
- (token_before_that == FOR || token_before_that == SELECT) &&
-#else
- (token_before_that == FOR) &&
-#endif
- (tokstr[0] == 'd' && tokstr[1] == 'o' && tokstr[2] == '\0'))
- return (DO);
-
- /* Ditto for ESAC in the CASE case.
- Specifically, this handles "case word in esac", which is a legal
- construct, certainly because someone will pass an empty arg to the
- case construct, and we don't want it to barf. Of course, we should
- insist that the case construct has at least one pattern in it, but
- the designers disagree. */
- if (esacs_needed_count)
- {
- esacs_needed_count--;
- if (STREQ (tokstr, "esac"))
- {
- parser_state &= ~PST_CASEPAT;
- return (ESAC);
- }
- }
-
- /* The start of a shell function definition. */
- if (parser_state & PST_ALLOWOPNBRC)
- {
- parser_state &= ~PST_ALLOWOPNBRC;
- if (tokstr[0] == '{' && tokstr[1] == '\0') /* } */
- {
- open_brace_count++;
- function_bstart = line_number;
- return ('{'); /* } */
- }
- }
-
- /* We allow a `do' after a for ((...)) without an intervening
- list_terminator */
- if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == 'd' && tokstr[1] == 'o' && !tokstr[2])
- return (DO);
- if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == '{' && tokstr[1] == '\0') /* } */
- {
- open_brace_count++;
- return ('{'); /* } */
- }
-
- if (open_brace_count && reserved_word_acceptable (last_read_token) && tokstr[0] == '}' && !tokstr[1])
- {
- open_brace_count--; /* { */
- return ('}');
- }
-
-#if defined (COMMAND_TIMING)
- /* Handle -p after `time'. */
- if (last_read_token == TIME && tokstr[0] == '-' && tokstr[1] == 'p' && !tokstr[2])
- return (TIMEOPT);
- /* Handle -- after `time -p'. */
- if (last_read_token == TIMEOPT && tokstr[0] == '-' && tokstr[1] == '-' && !tokstr[2])
- return (TIMEIGN);
-#endif
-
-#if defined (COND_COMMAND) /* [[ */
- if ((parser_state & PST_CONDEXPR) && tokstr[0] == ']' && tokstr[1] == ']' && tokstr[2] == '\0')
- return (COND_END);
-#endif
-
- return (-1);
-}
-
-/* Called from shell.c when Control-C is typed at top level. Or
- by the error rule at top level. */
-void
-reset_parser ()
-{
- dstack.delimiter_depth = 0; /* No delimiters found so far. */
- open_brace_count = 0;
-
-#if defined (EXTENDED_GLOB)
- /* Reset to global value of extended glob */
- if (parser_state & PST_EXTPAT)
- extended_glob = global_extglob;
-#endif
-
- parser_state = 0;
-
-#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
- if (pushed_string_list)
- free_string_list ();
-#endif /* ALIAS || DPAREN_ARITHMETIC */
-
- if (shell_input_line)
- {
- free (shell_input_line);
- shell_input_line = (char *)NULL;
- shell_input_line_size = shell_input_line_index = 0;
- }
-
- FREE (word_desc_to_read);
- word_desc_to_read = (WORD_DESC *)NULL;
-
- current_token = '\n'; /* XXX */
- last_read_token = '\n';
- token_to_read = '\n';
-}
-
-/* Read the next token. Command can be READ (normal operation) or
- RESET (to normalize state). */
-static int
-read_token (command)
- int command;
-{
- int character; /* Current character. */
- int peek_char; /* Temporary look-ahead character. */
- int result; /* The thing to return. */
-
- if (command == RESET)
- {
- reset_parser ();
- return ('\n');
- }
-
- if (token_to_read)
- {
- result = token_to_read;
- if (token_to_read == WORD || token_to_read == ASSIGNMENT_WORD)
- {
- yylval.word = word_desc_to_read;
- word_desc_to_read = (WORD_DESC *)NULL;
- }
- token_to_read = 0;
- return (result);
- }
-
-#if defined (COND_COMMAND)
- if ((parser_state & (PST_CONDCMD|PST_CONDEXPR)) == PST_CONDCMD)
- {
- cond_lineno = line_number;
- parser_state |= PST_CONDEXPR;
- yylval.command = parse_cond_command ();
- if (cond_token != COND_END)
- {
- cond_error ();
- return (-1);
- }
- token_to_read = COND_END;
- parser_state &= ~(PST_CONDEXPR|PST_CONDCMD);
- return (COND_CMD);
- }
-#endif
-
-#if defined (ALIAS)
- /* This is a place to jump back to once we have successfully expanded a
- token with an alias and pushed the string with push_string () */
- re_read_token:
-#endif /* ALIAS */
-
- /* Read a single word from input. Start by skipping blanks. */
- while ((character = shell_getc (1)) != EOF && shellblank (character))
- ;
-
- if (character == EOF)
- {
- EOF_Reached = 1;
- return (yacc_EOF);
- }
-
- if MBTEST(character == '#' && (!interactive || interactive_comments))
- {
- /* A comment. Discard until EOL or EOF, and then return a newline. */
- discard_until ('\n');
- shell_getc (0);
- character = '\n'; /* this will take the next if statement and return. */
- }
-
- if (character == '\n')
- {
- /* If we're about to return an unquoted newline, we can go and collect
- the text of any pending here document. */
- if (need_here_doc)
- gather_here_documents ();
-
-#if defined (ALIAS)
- parser_state &= ~PST_ALEXPNEXT;
-#endif /* ALIAS */
-
- parser_state &= ~PST_ASSIGNOK;
-
- return (character);
- }
-
- if (parser_state & PST_REGEXP)
- goto tokword;
-
- /* Shell meta-characters. */
- if MBTEST(shellmeta (character) && ((parser_state & PST_DBLPAREN) == 0))
- {
-#if defined (ALIAS)
- /* Turn off alias tokenization iff this character sequence would
- not leave us ready to read a command. */
- if (character == '<' || character == '>')
- parser_state &= ~PST_ALEXPNEXT;
-#endif /* ALIAS */
-
- parser_state &= ~PST_ASSIGNOK;
-
- if ((parser_state & PST_CMDSUBST) && character == shell_eof_token)
- peek_char = shell_getc (0);
- else
- peek_char = shell_getc (1);
-
- if (character == peek_char)
- {
- switch (character)
- {
- case '<':
- /* If '<' then we could be at "<<" or at "<<-". We have to
- look ahead one more character. */
- peek_char = shell_getc (1);
- if MBTEST(peek_char == '-')
- return (LESS_LESS_MINUS);
- else if MBTEST(peek_char == '<')
- return (LESS_LESS_LESS);
- else
- {
- shell_ungetc (peek_char);
- return (LESS_LESS);
- }
-
- case '>':
- return (GREATER_GREATER);
-
- case ';':
- parser_state |= PST_CASEPAT;
-#if defined (ALIAS)
- parser_state &= ~PST_ALEXPNEXT;
-#endif /* ALIAS */
-
- peek_char = shell_getc (1);
- if MBTEST(peek_char == '&')
- return (SEMI_SEMI_AND);
- else
- {
- shell_ungetc (peek_char);
- return (SEMI_SEMI);
- }
-
- case '&':
- return (AND_AND);
-
- case '|':
- return (OR_OR);
-
-#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
- case '(': /* ) */
- result = parse_dparen (character);
- if (result == -2)
- break;
- else
- return result;
-#endif
- }
- }
- else if MBTEST(character == '<' && peek_char == '&')
- return (LESS_AND);
- else if MBTEST(character == '>' && peek_char == '&')
- return (GREATER_AND);
- else if MBTEST(character == '<' && peek_char == '>')
- return (LESS_GREATER);
- else if MBTEST(character == '>' && peek_char == '|')
- return (GREATER_BAR);
- else if MBTEST(character == '&' && peek_char == '>')
- {
- peek_char = shell_getc (1);
- if MBTEST(peek_char == '>')
- return (AND_GREATER_GREATER);
- else
- {
- shell_ungetc (peek_char);
- return (AND_GREATER);
- }
- }
- else if MBTEST(character == '|' && peek_char == '&')
- return (BAR_AND);
- else if MBTEST(character == ';' && peek_char == '&')
- {
- parser_state |= PST_CASEPAT;
-#if defined (ALIAS)
- parser_state &= ~PST_ALEXPNEXT;
-#endif /* ALIAS */
- return (SEMI_AND);
- }
-
- shell_ungetc (peek_char);
-
- /* If we look like we are reading the start of a function
- definition, then let the reader know about it so that
- we will do the right thing with `{'. */
- if MBTEST(character == ')' && last_read_token == '(' && token_before_that == WORD)
- {
- parser_state |= PST_ALLOWOPNBRC;
-#if defined (ALIAS)
- parser_state &= ~PST_ALEXPNEXT;
-#endif /* ALIAS */
- function_dstart = line_number;
- }
-
- /* case pattern lists may be preceded by an optional left paren. If
- we're not trying to parse a case pattern list, the left paren
- indicates a subshell. */
- if MBTEST(character == '(' && (parser_state & PST_CASEPAT) == 0) /* ) */
- parser_state |= PST_SUBSHELL;
- /*(*/
- else if MBTEST((parser_state & PST_CASEPAT) && character == ')')
- parser_state &= ~PST_CASEPAT;
- /*(*/
- else if MBTEST((parser_state & PST_SUBSHELL) && character == ')')
- parser_state &= ~PST_SUBSHELL;
-
-#if defined (PROCESS_SUBSTITUTION)
- /* Check for the constructs which introduce process substitution.
- Shells running in `posix mode' don't do process substitution. */
- if MBTEST(posixly_correct || ((character != '>' && character != '<') || peek_char != '(')) /*)*/
-#endif /* PROCESS_SUBSTITUTION */
- return (character);
- }
-
- /* Hack <&- (close stdin) case. Also <&N- (dup and close). */
- if MBTEST(character == '-' && (last_read_token == LESS_AND || last_read_token == GREATER_AND))
- return (character);
-
-tokword:
- /* Okay, if we got this far, we have to read a word. Read one,
- and then check it against the known ones. */
- result = read_token_word (character);
-#if defined (ALIAS)
- if (result == RE_READ_TOKEN)
- goto re_read_token;
-#endif
- return result;
-}
-
-/*
- * Match a $(...) or other grouping construct. This has to handle embedded
- * quoted strings ('', ``, "") and nested constructs. It also must handle
- * reprompting the user, if necessary, after reading a newline, and returning
- * correct error values if it reads EOF.
- */
-#define P_FIRSTCLOSE 0x0001
-#define P_ALLOWESC 0x0002
-#define P_DQUOTE 0x0004
-#define P_COMMAND 0x0008 /* parsing a command, so look for comments */
-#define P_BACKQUOTE 0x0010 /* parsing a backquoted command substitution */
-#define P_ARRAYSUB 0x0020 /* parsing a [...] array subscript for assignment */
-#define P_DOLBRACE 0x0040 /* parsing a ${...} construct */
-
-/* Lexical state while parsing a grouping construct or $(...). */
-#define LEX_WASDOL 0x001
-#define LEX_CKCOMMENT 0x002
-#define LEX_INCOMMENT 0x004
-#define LEX_PASSNEXT 0x008
-#define LEX_RESWDOK 0x010
-#define LEX_CKCASE 0x020
-#define LEX_INCASE 0x040
-#define LEX_INHEREDOC 0x080
-#define LEX_HEREDELIM 0x100 /* reading here-doc delimiter */
-#define LEX_STRIPDOC 0x200 /* <<- strip tabs from here doc delim */
-#define LEX_INWORD 0x400
-
-#define COMSUB_META(ch) ((ch) == ';' || (ch) == '&' || (ch) == '|')
-
-#define CHECK_NESTRET_ERROR() \
- do { \
- if (nestret == &matched_pair_error) \
- { \
- free (ret); \
- return &matched_pair_error; \
- } \
- } while (0)
-
-#define APPEND_NESTRET() \
- do { \
- if (nestlen) \
- { \
- RESIZE_MALLOCED_BUFFER (ret, retind, nestlen, retsize, 64); \
- strcpy (ret + retind, nestret); \
- retind += nestlen; \
- } \
- } while (0)
-
-static char matched_pair_error;
-
-static char *
-parse_matched_pair (qc, open, close, lenp, flags)
- int qc; /* `"' if this construct is within double quotes */
- int open, close;
- int *lenp, flags;
-{
- int count, ch, tflags;
- int nestlen, ttranslen, start_lineno;
- char *ret, *nestret, *ttrans;
- int retind, retsize, rflags;
- int dolbrace_state;
-
- dolbrace_state = (flags & P_DOLBRACE) ? DOLBRACE_PARAM : 0;
-
-/*itrace("parse_matched_pair[%d]: open = %c close = %c flags = %d", line_number, open, close, flags);*/
- count = 1;
- tflags = 0;
-
- if ((flags & P_COMMAND) && qc != '`' && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0)
- tflags |= LEX_CKCOMMENT;
-
- /* RFLAGS is the set of flags we want to pass to recursive calls. */
- rflags = (qc == '"') ? P_DQUOTE : (flags & P_DQUOTE);
-
- ret = (char *)xmalloc (retsize = 64);
- retind = 0;
-
- start_lineno = line_number;
- while (count)
- {
- ch = shell_getc (qc != '\'' && (tflags & (LEX_PASSNEXT)) == 0);
-
- if (ch == EOF)
- {
- free (ret);
- parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close);
- EOF_Reached = 1; /* XXX */
- return (&matched_pair_error);
- }
-
- /* Possible reprompting. */
- if (ch == '\n' && SHOULD_PROMPT ())
- prompt_again ();
-
- /* Don't bother counting parens or doing anything else if in a comment
- or part of a case statement */
- if (tflags & LEX_INCOMMENT)
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
-
- if (ch == '\n')
- tflags &= ~LEX_INCOMMENT;
-
- continue;
- }
-
- /* Not exactly right yet, should handle shell metacharacters, too. If
- any changes are made to this test, make analogous changes to subst.c:
- extract_delimited_string(). */
- else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (retind == 0 || ret[retind-1] == '\n' || shellblank (ret[retind - 1])))
- tflags |= LEX_INCOMMENT;
-
- if (tflags & LEX_PASSNEXT) /* last char was backslash */
- {
- tflags &= ~LEX_PASSNEXT;
- if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */
- {
- if (retind > 0)
- retind--; /* swallow previously-added backslash */
- continue;
- }
-
- RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
- if MBTEST(ch == CTLESC)
- ret[retind++] = CTLESC;
- ret[retind++] = ch;
- continue;
- }
- /* If we're reparsing the input (e.g., from parse_string_to_word_list),
- we've already prepended CTLESC to single-quoted results of $'...'.
- We may want to do this for other CTLESC-quoted characters in
- reparse, too. */
- else if MBTEST((parser_state & PST_REPARSE) && open == '\'' && (ch == CTLESC || ch == CTLNUL))
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
- continue;
- }
- else if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
- ret[retind++] = CTLESC;
- ret[retind++] = ch;
- continue;
- }
- else if MBTEST(ch == close) /* ending delimiter */
- count--;
- /* handle nested ${...} specially. */
- else if MBTEST(open != close && (tflags & LEX_WASDOL) && open == '{' && ch == open) /* } */
- count++;
- else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && ch == open) /* nested begin */
- count++;
-
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
-
- /* If we just read the ending character, don't bother continuing. */
- if (count == 0)
- break;
-
- if (open == '\'') /* '' inside grouping construct */
- {
- if MBTEST((flags & P_ALLOWESC) && ch == '\\')
- tflags |= LEX_PASSNEXT;
- continue;
- }
-
- if MBTEST(ch == '\\') /* backslashes */
- tflags |= LEX_PASSNEXT;
-
- /* Based on which dolstate is currently in (param, op, or word),
- decide what the op is. We're really only concerned if it's % or
- #, so we can turn on a flag that says whether or not we should
- treat single quotes as special when inside a double-quoted
- ${...}. This logic must agree with subst.c:extract_dollar_brace_string
- since they share the same defines. */
- /* FLAG POSIX INTERP 221 */
- if (flags & P_DOLBRACE)
- {
- /* ${param%[%]word} */
- if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '%' && retind > 1)
- dolbrace_state = DOLBRACE_QUOTE;
- /* ${param#[#]word} */
- else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '#' && retind > 1)
- dolbrace_state = DOLBRACE_QUOTE;
- /* ${param/[/]pat/rep} */
- else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '/' && retind > 1)
- dolbrace_state = DOLBRACE_QUOTE2; /* XXX */
- /* ${param^[^]pat} */
- else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '^' && retind > 1)
- dolbrace_state = DOLBRACE_QUOTE;
- /* ${param,[,]pat} */
- else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == ',' && retind > 1)
- dolbrace_state = DOLBRACE_QUOTE;
- else if MBTEST(dolbrace_state == DOLBRACE_PARAM && strchr ("#%^,~:-=?+/", ch) != 0)
- dolbrace_state = DOLBRACE_OP;
- else if MBTEST(dolbrace_state == DOLBRACE_OP && strchr ("#%^,~:-=?+/", ch) == 0)
- dolbrace_state = DOLBRACE_WORD;
- }
-
- /* The big hammer. Single quotes aren't special in double quotes. The
- problem is that Posix used to say the single quotes are semi-special:
- within a double-quoted ${...} construct "an even number of
- unescaped double-quotes or single-quotes, if any, shall occur." */
- /* This was changed in Austin Group Interp 221 */
- if MBTEST(posixly_correct && shell_compatibility_level > 41 && dolbrace_state != DOLBRACE_QUOTE && dolbrace_state != DOLBRACE_QUOTE2 && (flags & P_DQUOTE) && (flags & P_DOLBRACE) && ch == '\'')
- continue;
-
- /* Could also check open == '`' if we want to parse grouping constructs
- inside old-style command substitution. */
- if (open != close) /* a grouping construct */
- {
- if MBTEST(shellquote (ch))
- {
- /* '', ``, or "" inside $(...) or other grouping construct. */
- push_delimiter (dstack, ch);
- if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */
- nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags);
- else
- nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags);
- pop_delimiter (dstack);
- CHECK_NESTRET_ERROR ();
-
- if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0))
- {
- /* Translate $'...' here. */
- ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen);
- xfree (nestret);
-
- /* If we're parsing a double-quoted brace expansion and we are
- not in a place where single quotes are treated specially,
- make sure we single-quote the results of the ansi
- expansion because quote removal should remove them later */
- /* FLAG POSIX INTERP 221 */
- if ((shell_compatibility_level > 42) && (rflags & P_DQUOTE) && (dolbrace_state == DOLBRACE_QUOTE2) && (flags & P_DOLBRACE))
- {
- nestret = sh_single_quote (ttrans);
- free (ttrans);
- nestlen = strlen (nestret);
- }
- else if ((rflags & P_DQUOTE) == 0)
- {
- nestret = sh_single_quote (ttrans);
- free (ttrans);
- nestlen = strlen (nestret);
- }
- else
- {
- nestret = ttrans;
- nestlen = ttranslen;
- }
- retind -= 2; /* back up before the $' */
- }
- else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0))
- {
- /* Locale expand $"..." here. */
- ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen);
- xfree (nestret);
-
- nestret = sh_mkdoublequoted (ttrans, ttranslen, 0);
- free (ttrans);
- nestlen = ttranslen + 2;
- retind -= 2; /* back up before the $" */
- }
-
- APPEND_NESTRET ();
- FREE (nestret);
- }
- else if ((flags & P_ARRAYSUB) && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
- goto parse_dollar_word;
- }
- /* Parse an old-style command substitution within double quotes as a
- single word. */
- /* XXX - sh and ksh93 don't do this - XXX */
- else if MBTEST(open == '"' && ch == '`')
- {
- nestret = parse_matched_pair (0, '`', '`', &nestlen, rflags);
-
- CHECK_NESTRET_ERROR ();
- APPEND_NESTRET ();
-
- FREE (nestret);
- }
- else if MBTEST(open != '`' && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
- /* check for $(), $[], or ${} inside quoted string. */
- {
-parse_dollar_word:
- if (open == ch) /* undo previous increment */
- count--;
- if (ch == '(') /* ) */
- nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE);
- else if (ch == '{') /* } */
- nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags);
- else if (ch == '[') /* ] */
- nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
-
- CHECK_NESTRET_ERROR ();
- APPEND_NESTRET ();
-
- FREE (nestret);
- }
- if MBTEST(ch == '$')
- tflags |= LEX_WASDOL;
- else
- tflags &= ~LEX_WASDOL;
- }
-
- ret[retind] = '\0';
- if (lenp)
- *lenp = retind;
-/*itrace("parse_matched_pair[%d]: returning %s", line_number, ret);*/
- return ret;
-}
-
-/* Parse a $(...) command substitution. This is messier than I'd like, and
- reproduces a lot more of the token-reading code than I'd like. */
-static char *
-parse_comsub (qc, open, close, lenp, flags)
- int qc; /* `"' if this construct is within double quotes */
- int open, close;
- int *lenp, flags;
-{
- int count, ch, peekc, tflags, lex_rwlen, lex_wlen, lex_firstind;
- int nestlen, ttranslen, start_lineno;
- char *ret, *nestret, *ttrans, *heredelim;
- int retind, retsize, rflags, hdlen;
-
- /* Posix interp 217 says arithmetic expressions have precedence, so
- assume $(( introduces arithmetic expansion and parse accordingly. */
- peekc = shell_getc (0);
- shell_ungetc (peekc);
- if (peekc == '(')
- return (parse_matched_pair (qc, open, close, lenp, 0));
-
-/*itrace("parse_comsub: qc = `%c' open = %c close = %c", qc, open, close);*/
- count = 1;
- tflags = LEX_RESWDOK;
-
- if ((flags & P_COMMAND) && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0)
- tflags |= LEX_CKCASE;
- if ((tflags & LEX_CKCASE) && (interactive == 0 || interactive_comments))
- tflags |= LEX_CKCOMMENT;
-
- /* RFLAGS is the set of flags we want to pass to recursive calls. */
- rflags = (flags & P_DQUOTE);
-
- ret = (char *)xmalloc (retsize = 64);
- retind = 0;
-
- start_lineno = line_number;
- lex_rwlen = lex_wlen = 0;
-
- heredelim = 0;
- lex_firstind = -1;
-
- while (count)
- {
-comsub_readchar:
- ch = shell_getc (qc != '\'' && (tflags & (LEX_INCOMMENT|LEX_PASSNEXT)) == 0);
-
- if (ch == EOF)
- {
-eof_error:
- free (ret);
- FREE (heredelim);
- parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close);
- EOF_Reached = 1; /* XXX */
- return (&matched_pair_error);
- }
-
- /* If we hit the end of a line and are reading the contents of a here
- document, and it's not the same line that the document starts on,
- check for this line being the here doc delimiter. Otherwise, if
- we're in a here document, mark the next character as the beginning
- of a line. */
- if (ch == '\n')
- {
- if ((tflags & LEX_HEREDELIM) && heredelim)
- {
- tflags &= ~LEX_HEREDELIM;
- tflags |= LEX_INHEREDOC;
- lex_firstind = retind + 1;
- }
- else if (tflags & LEX_INHEREDOC)
- {
- int tind;
- tind = lex_firstind;
- while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t')
- tind++;
- if (STREQN (ret + tind, heredelim, hdlen))
- {
- tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC);
-/*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/
- free (heredelim);
- heredelim = 0;
- lex_firstind = -1;
- }
- else
- lex_firstind = retind + 1;
- }
- }
-
- /* Possible reprompting. */
- if (ch == '\n' && SHOULD_PROMPT ())
- prompt_again ();
-
- /* XXX -- possibly allow here doc to be delimited by ending right
- paren. */
- if ((tflags & LEX_INHEREDOC) && ch == close && count == 1)
- {
- int tind;
-/*itrace("parse_comsub: in here doc, ch == close, retind - firstind = %d hdlen = %d retind = %d", retind-lex_firstind, hdlen, retind);*/
- tind = lex_firstind;
- while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t')
- tind++;
- if (retind-tind == hdlen && STREQN (ret + tind, heredelim, hdlen))
- {
- tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC);
-/*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/
- free (heredelim);
- heredelim = 0;
- lex_firstind = -1;
- }
- }
-
- /* Don't bother counting parens or doing anything else if in a comment */
- if (tflags & (LEX_INCOMMENT|LEX_INHEREDOC))
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
-
- if ((tflags & LEX_INCOMMENT) && ch == '\n')
- {
-/*itrace("parse_comsub:%d: lex_incomment -> 0 ch = `%c'", line_number, ch);*/
- tflags &= ~LEX_INCOMMENT;
- }
-
- continue;
- }
-
- if (tflags & LEX_PASSNEXT) /* last char was backslash */
- {
-/*itrace("parse_comsub:%d: lex_passnext -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/
- tflags &= ~LEX_PASSNEXT;
- if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */
- {
- if (retind > 0)
- retind--; /* swallow previously-added backslash */
- continue;
- }
-
- RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
- if MBTEST(ch == CTLESC)
- ret[retind++] = CTLESC;
- ret[retind++] = ch;
- continue;
- }
-
- /* If this is a shell break character, we are not in a word. If not,
- we either start or continue a word. */
- if MBTEST(shellbreak (ch))
- {
- tflags &= ~LEX_INWORD;
-/*itrace("parse_comsub:%d: lex_inword -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/
- }
- else
- {
- if (tflags & LEX_INWORD)
- {
- lex_wlen++;
-/*itrace("parse_comsub:%d: lex_inword == 1 ch = `%c' lex_wlen = %d (%d)", line_number, ch, lex_wlen, __LINE__);*/
- }
- else
- {
-/*itrace("parse_comsub:%d: lex_inword -> 1 ch = `%c' (%d)", line_number, ch, __LINE__);*/
- tflags |= LEX_INWORD;
- lex_wlen = 0;
- }
- }
-
- /* Skip whitespace */
- if MBTEST(shellblank (ch) && (tflags & LEX_HEREDELIM) == 0 && lex_rwlen == 0)
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
- continue;
- }
-
- /* Either we are looking for the start of the here-doc delimiter
- (lex_firstind == -1) or we are reading one (lex_firstind >= 0).
- If this character is a shell break character and we are reading
- the delimiter, save it and note that we are now reading a here
- document. If we've found the start of the delimiter, note it by
- setting lex_firstind. Backslashes can quote shell metacharacters
- in here-doc delimiters. */
- if (tflags & LEX_HEREDELIM)
- {
- if (lex_firstind == -1 && shellbreak (ch) == 0)
- lex_firstind = retind;
-#if 0
- else if (heredelim && (tflags & LEX_PASSNEXT) == 0 && ch == '\n')
- {
- tflags |= LEX_INHEREDOC;
- tflags &= ~LEX_HEREDELIM;
- lex_firstind = retind + 1;
- }
-#endif
- else if (lex_firstind >= 0 && (tflags & LEX_PASSNEXT) == 0 && shellbreak (ch))
- {
- if (heredelim == 0)
- {
- nestret = substring (ret, lex_firstind, retind);
- heredelim = string_quote_removal (nestret, 0);
- free (nestret);
- hdlen = STRLEN(heredelim);
-/*itrace("parse_comsub:%d: found here doc delimiter `%s' (%d)", line_number, heredelim, hdlen);*/
- }
- if (ch == '\n')
- {
- tflags |= LEX_INHEREDOC;
- tflags &= ~LEX_HEREDELIM;
- lex_firstind = retind + 1;
- }
- else
- lex_firstind = -1;
- }
- }
-
- /* Meta-characters that can introduce a reserved word. Not perfect yet. */
- if MBTEST((tflags & LEX_RESWDOK) == 0 && (tflags & LEX_CKCASE) && (tflags & LEX_INCOMMENT) == 0 && (shellmeta(ch) || ch == '\n'))
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
- peekc = shell_getc (1);
- if (ch == peekc && (ch == '&' || ch == '|' || ch == ';')) /* two-character tokens */
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = peekc;
-/*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/
- tflags |= LEX_RESWDOK;
- lex_rwlen = 0;
- continue;
- }
- else if (ch == '\n' || COMSUB_META(ch))
- {
- shell_ungetc (peekc);
-/*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/
- tflags |= LEX_RESWDOK;
- lex_rwlen = 0;
- continue;
- }
- else if (ch == EOF)
- goto eof_error;
- else
- {
- /* `unget' the character we just added and fall through */
- retind--;
- shell_ungetc (peekc);
- }
- }
-
- /* If we can read a reserved word, try to read one. */
- if (tflags & LEX_RESWDOK)
- {
- if MBTEST(islower (ch))
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
- lex_rwlen++;
- continue;
- }
- else if MBTEST(lex_rwlen == 4 && shellbreak (ch))
- {
- if (STREQN (ret + retind - 4, "case", 4))
- {
- tflags |= LEX_INCASE;
-/*itrace("parse_comsub:%d: found `case', lex_incase -> 1 lex_reswdok -> 0", line_number);*/
- }
- else if (STREQN (ret + retind - 4, "esac", 4))
- {
- tflags &= ~LEX_INCASE;
-/*itrace("parse_comsub:%d: found `esac', lex_incase -> 0 lex_reswdok -> 0", line_number);*/
- }
- tflags &= ~LEX_RESWDOK;
- }
- else if MBTEST((tflags & LEX_CKCOMMENT) && ch == '#' && (lex_rwlen == 0 || ((tflags & LEX_INWORD) && lex_wlen == 0)))
- ; /* don't modify LEX_RESWDOK if we're starting a comment */
- /* Allow `do' followed by space, tab, or newline to preserve the
- RESWDOK flag, but reset the reserved word length counter so we
- can read another one. */
- else if MBTEST(((tflags & LEX_INCASE) == 0) &&
- (isblank(ch) || ch == '\n') &&
- lex_rwlen == 2 &&
- STREQN (ret + retind - 2, "do", 2))
- {
-/*itrace("parse_comsub:%d: lex_incase == 1 found `%c', found \"do\"", line_number, ch);*/
- lex_rwlen = 0;
- }
- else if MBTEST((tflags & LEX_INCASE) && ch != '\n')
- /* If we can read a reserved word and we're in case, we're at the
- point where we can read a new pattern list or an esac. We
- handle the esac case above. If we read a newline, we want to
- leave LEX_RESWDOK alone. If we read anything else, we want to
- turn off LEX_RESWDOK, since we're going to read a pattern list. */
- {
- tflags &= ~LEX_RESWDOK;
-/*itrace("parse_comsub:%d: lex_incase == 1 found `%c', lex_reswordok -> 0", line_number, ch);*/
- }
- else if MBTEST(shellbreak (ch) == 0)
- {
- tflags &= ~LEX_RESWDOK;
-/*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/
- }
-#if 0
- /* If we find a space or tab but have read something and it's not
- `do', turn off the reserved-word-ok flag */
- else if MBTEST(isblank (ch) && lex_rwlen > 0)
- {
- tflags &= ~LEX_RESWDOK;
-/*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/
- }
-#endif
- }
-
- /* Might be the start of a here-doc delimiter */
- if MBTEST((tflags & LEX_INCOMMENT) == 0 && (tflags & LEX_CKCASE) && ch == '<')
- {
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
- peekc = shell_getc (1);
- if (peekc == EOF)
- goto eof_error;
- if (peekc == ch)
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = peekc;
- peekc = shell_getc (1);
- if (peekc == EOF)
- goto eof_error;
- if (peekc == '-')
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = peekc;
- tflags |= LEX_STRIPDOC;
- }
- else
- shell_ungetc (peekc);
- if (peekc != '<')
- {
- tflags |= LEX_HEREDELIM;
- lex_firstind = -1;
- }
- continue;
- }
- else
- ch = peekc; /* fall through and continue XXX */
- }
- else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (((tflags & LEX_RESWDOK) && lex_rwlen == 0) || ((tflags & LEX_INWORD) && lex_wlen == 0)))
- {
-/*itrace("parse_comsub:%d: lex_incomment -> 1 (%d)", line_number, __LINE__);*/
- tflags |= LEX_INCOMMENT;
- }
-
- if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */
- {
- RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
- ret[retind++] = CTLESC;
- ret[retind++] = ch;
- continue;
- }
-#if 0
- else if MBTEST((tflags & LEX_INCASE) && ch == close && close == ')')
- tflags &= ~LEX_INCASE; /* XXX */
-#endif
- else if MBTEST(ch == close && (tflags & LEX_INCASE) == 0) /* ending delimiter */
- {
- count--;
-/*itrace("parse_comsub:%d: found close: count = %d", line_number, count);*/
- }
- else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && (tflags & LEX_INCASE) == 0 && ch == open) /* nested begin */
- {
- count++;
-/*itrace("parse_comsub:%d: found open: count = %d", line_number, count);*/
- }
-
- /* Add this character. */
- RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
- ret[retind++] = ch;
-
- /* If we just read the ending character, don't bother continuing. */
- if (count == 0)
- break;
-
- if MBTEST(ch == '\\') /* backslashes */
- tflags |= LEX_PASSNEXT;
-
- if MBTEST(shellquote (ch))
- {
- /* '', ``, or "" inside $(...). */
- push_delimiter (dstack, ch);
- if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */
- nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags);
- else
- nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags);
- pop_delimiter (dstack);
- CHECK_NESTRET_ERROR ();
-
- if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0))
- {
- /* Translate $'...' here. */
- ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen);
- xfree (nestret);
-
- if ((rflags & P_DQUOTE) == 0)
- {
- nestret = sh_single_quote (ttrans);
- free (ttrans);
- nestlen = strlen (nestret);
- }
- else
- {
- nestret = ttrans;
- nestlen = ttranslen;
- }
- retind -= 2; /* back up before the $' */
- }
- else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0))
- {
- /* Locale expand $"..." here. */
- ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen);
- xfree (nestret);
-
- nestret = sh_mkdoublequoted (ttrans, ttranslen, 0);
- free (ttrans);
- nestlen = ttranslen + 2;
- retind -= 2; /* back up before the $" */
- }
-
- APPEND_NESTRET ();
- FREE (nestret);
- }
- else if MBTEST((tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
- /* check for $(), $[], or ${} inside command substitution. */
- {
- if ((tflags & LEX_INCASE) == 0 && open == ch) /* undo previous increment */
- count--;
- if (ch == '(') /* ) */
- nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE);
- else if (ch == '{') /* } */
- nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags);
- else if (ch == '[') /* ] */
- nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
-
- CHECK_NESTRET_ERROR ();
- APPEND_NESTRET ();
-
- FREE (nestret);
- }
- if MBTEST(ch == '$')
- tflags |= LEX_WASDOL;
- else
- tflags &= ~LEX_WASDOL;
- }
-
- FREE (heredelim);
- ret[retind] = '\0';
- if (lenp)
- *lenp = retind;
-/*itrace("parse_comsub:%d: returning `%s'", line_number, ret);*/
- return ret;
-}
-
-/* Recursively call the parser to parse a $(...) command substitution. */
-char *
-xparse_dolparen (base, string, indp, flags)
- char *base;
- char *string;
- int *indp;
- int flags;
-{
- sh_parser_state_t ps;
- sh_input_line_state_t ls;
- int orig_ind, nc, sflags, orig_eof_token;
- char *ret, *s, *ep, *ostring;
-
- /*yydebug = 1;*/
- orig_ind = *indp;
- ostring = string;
-
-/*itrace("xparse_dolparen: size = %d shell_input_line = `%s'", shell_input_line_size, shell_input_line);*/
- sflags = SEVAL_NONINT|SEVAL_NOHIST|SEVAL_NOFREE;
- if (flags & SX_NOLONGJMP)
- sflags |= SEVAL_NOLONGJMP;
- save_parser_state (&ps);
- save_input_line_state (&ls);
- orig_eof_token = shell_eof_token;
-
- /*(*/
- parser_state |= PST_CMDSUBST|PST_EOFTOKEN; /* allow instant ')' */ /*(*/
- shell_eof_token = ')';
- parse_string (string, "command substitution", sflags, &ep);
-
- shell_eof_token = orig_eof_token;
- restore_parser_state (&ps);
- reset_parser ();
- /* reset_parser clears shell_input_line and associated variables */
- restore_input_line_state (&ls);
- if (interactive)
- token_to_read = 0;
-
- /* Need to find how many characters parse_and_execute consumed, update
- *indp, if flags != 0, copy the portion of the string parsed into RET
- and return it. If flags & 1 (EX_NOALLOC) we can return NULL. */
-
- /*(*/
- if (ep[-1] != ')')
- {
-#if DEBUG
- if (ep[-1] != '\n')
- itrace("xparse_dolparen:%d: ep[-1] != RPAREN (%d), ep = `%s'", line_number, ep[-1], ep);
-#endif
- while (ep > ostring && ep[-1] == '\n') ep--;
- }
-
- nc = ep - ostring;
- *indp = ep - base - 1;
-
- /*(*/
-#if DEBUG
- if (base[*indp] != ')')
- itrace("xparse_dolparen:%d: base[%d] != RPAREN (%d), base = `%s'", line_number, *indp, base[*indp], base);
-#endif
-
- if (flags & SX_NOALLOC)
- return (char *)NULL;
-
- if (nc == 0)
- {
- ret = xmalloc (1);
- ret[0] = '\0';
- }
- else
- ret = substring (ostring, 0, nc - 1);
-
- return ret;
-}
-
-#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
-/* Parse a double-paren construct. It can be either an arithmetic
- command, an arithmetic `for' command, or a nested subshell. Returns
- the parsed token, -1 on error, or -2 if we didn't do anything and
- should just go on. */
-static int
-parse_dparen (c)
- int c;
-{
- int cmdtyp, sline;
- char *wval;
- WORD_DESC *wd;
-
-#if defined (ARITH_FOR_COMMAND)
- if (last_read_token == FOR)
- {
- arith_for_lineno = line_number;
- cmdtyp = parse_arith_cmd (&wval, 0);
- if (cmdtyp == 1)
- {
- wd = alloc_word_desc ();
- wd->word = wval;
- yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL);
- return (ARITH_FOR_EXPRS);
- }
- else
- return -1; /* ERROR */
- }
-#endif
-
-#if defined (DPAREN_ARITHMETIC)
- if (reserved_word_acceptable (last_read_token))
- {
- sline = line_number;
-
- cmdtyp = parse_arith_cmd (&wval, 0);
- if (cmdtyp == 1) /* arithmetic command */
- {
- wd = alloc_word_desc ();
- wd->word = wval;
- wd->flags = W_QUOTED|W_NOSPLIT|W_NOGLOB|W_DQUOTE;
- yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL);
- return (ARITH_CMD);
- }
- else if (cmdtyp == 0) /* nested subshell */
- {
- push_string (wval, 0, (alias_t *)NULL);
- pushed_string_list->flags = PSH_DPAREN;
- if ((parser_state & PST_CASEPAT) == 0)
- parser_state |= PST_SUBSHELL;
- return (c);
- }
- else /* ERROR */
- return -1;
- }
-#endif
-
- return -2; /* XXX */
-}
-
-/* We've seen a `(('. Look for the matching `))'. If we get it, return 1.
- If not, assume it's a nested subshell for backwards compatibility and
- return 0. In any case, put the characters we've consumed into a locally-
- allocated buffer and make *ep point to that buffer. Return -1 on an
- error, for example EOF. */
-static int
-parse_arith_cmd (ep, adddq)
- char **ep;
- int adddq;
-{
- int exp_lineno, rval, c;
- char *ttok, *tokstr;
- int ttoklen;
-
- exp_lineno = line_number;
- ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0);
- rval = 1;
- if (ttok == &matched_pair_error)
- return -1;
- /* Check that the next character is the closing right paren. If
- not, this is a syntax error. ( */
- c = shell_getc (0);
- if MBTEST(c != ')')
- rval = 0;
-
- tokstr = (char *)xmalloc (ttoklen + 4);
-
- /* if ADDDQ != 0 then (( ... )) -> "..." */
- if (rval == 1 && adddq) /* arith cmd, add double quotes */
- {
- tokstr[0] = '"';
- strncpy (tokstr + 1, ttok, ttoklen - 1);
- tokstr[ttoklen] = '"';
- tokstr[ttoklen+1] = '\0';
- }
- else if (rval == 1) /* arith cmd, don't add double quotes */
- {
- strncpy (tokstr, ttok, ttoklen - 1);
- tokstr[ttoklen-1] = '\0';
- }
- else /* nested subshell */
- {
- tokstr[0] = '(';
- strncpy (tokstr + 1, ttok, ttoklen - 1);
- tokstr[ttoklen] = ')';
- tokstr[ttoklen+1] = c;
- tokstr[ttoklen+2] = '\0';
- }
-
- *ep = tokstr;
- FREE (ttok);
- return rval;
-}
-#endif /* DPAREN_ARITHMETIC || ARITH_FOR_COMMAND */
-
-#if defined (COND_COMMAND)
-static void
-cond_error ()
-{
- char *etext;
-
- if (EOF_Reached && cond_token != COND_ERROR) /* [[ */
- parser_error (cond_lineno, _("unexpected EOF while looking for `]]'"));
- else if (cond_token != COND_ERROR)
- {
- if (etext = error_token_from_token (cond_token))
- {
- parser_error (cond_lineno, _("syntax error in conditional expression: unexpected token `%s'"), etext);
- free (etext);
- }
- else
- parser_error (cond_lineno, _("syntax error in conditional expression"));
- }
-}
-
-static COND_COM *
-cond_expr ()
-{
- return (cond_or ());
-}
-
-static COND_COM *
-cond_or ()
-{
- COND_COM *l, *r;
-
- l = cond_and ();
- if (cond_token == OR_OR)
- {
- r = cond_or ();
- l = make_cond_node (COND_OR, (WORD_DESC *)NULL, l, r);
- }
- return l;
-}
-
-static COND_COM *
-cond_and ()
-{
- COND_COM *l, *r;
-
- l = cond_term ();
- if (cond_token == AND_AND)
- {
- r = cond_and ();
- l = make_cond_node (COND_AND, (WORD_DESC *)NULL, l, r);
- }
- return l;
-}
-
-static int
-cond_skip_newlines ()
-{
- while ((cond_token = read_token (READ)) == '\n')
- {
- if (SHOULD_PROMPT ())
- prompt_again ();
- }
- return (cond_token);
-}
-
-#define COND_RETURN_ERROR() \
- do { cond_token = COND_ERROR; return ((COND_COM *)NULL); } while (0)
-
-static COND_COM *
-cond_term ()
-{
- WORD_DESC *op;
- COND_COM *term, *tleft, *tright;
- int tok, lineno;
- char *etext;
-
- /* Read a token. It can be a left paren, a `!', a unary operator, or a
- word that should be the first argument of a binary operator. Start by
- skipping newlines, since this is a compound command. */
- tok = cond_skip_newlines ();
- lineno = line_number;
- if (tok == COND_END)
- {
- COND_RETURN_ERROR ();
- }
- else if (tok == '(')
- {
- term = cond_expr ();
- if (cond_token != ')')
- {
- if (term)
- dispose_cond_node (term); /* ( */
- if (etext = error_token_from_token (cond_token))
- {
- parser_error (lineno, _("unexpected token `%s', expected `)'"), etext);
- free (etext);
- }
- else
- parser_error (lineno, _("expected `)'"));
- COND_RETURN_ERROR ();
- }
- term = make_cond_node (COND_EXPR, (WORD_DESC *)NULL, term, (COND_COM *)NULL);
- (void)cond_skip_newlines ();
- }
- else if (tok == BANG || (tok == WORD && (yylval.word->word[0] == '!' && yylval.word->word[1] == '\0')))
- {
- if (tok == WORD)
- dispose_word (yylval.word); /* not needed */
- term = cond_term ();
- if (term)
- term->flags |= CMD_INVERT_RETURN;
- }
- else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[2] == 0 && test_unop (yylval.word->word))
- {
- op = yylval.word;
- tok = read_token (READ);
- if (tok == WORD)
- {
- tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
- term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL);
- }
- else
- {
- dispose_word (op);
- if (etext = error_token_from_token (tok))
- {
- parser_error (line_number, _("unexpected argument `%s' to conditional unary operator"), etext);
- free (etext);
- }
- else
- parser_error (line_number, _("unexpected argument to conditional unary operator"));
- COND_RETURN_ERROR ();
- }
-
- (void)cond_skip_newlines ();
- }
- else if (tok == WORD) /* left argument to binary operator */
- {
- /* lhs */
- tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
-
- /* binop */
- tok = read_token (READ);
- if (tok == WORD && test_binop (yylval.word->word))
- {
- op = yylval.word;
- if (op->word[0] == '=' && (op->word[1] == '\0' || (op->word[1] == '=' && op->word[2] == '\0')))
- parser_state |= PST_EXTPAT;
- else if (op->word[0] == '!' && op->word[1] == '=' && op->word[2] == '\0')
- parser_state |= PST_EXTPAT;
- }
-#if defined (COND_REGEXP)
- else if (tok == WORD && STREQ (yylval.word->word, "=~"))
- {
- op = yylval.word;
- parser_state |= PST_REGEXP;
- }
-#endif
- else if (tok == '<' || tok == '>')
- op = make_word_from_token (tok); /* ( */
- /* There should be a check before blindly accepting the `)' that we have
- seen the opening `('. */
- else if (tok == COND_END || tok == AND_AND || tok == OR_OR || tok == ')')
- {
- /* Special case. [[ x ]] is equivalent to [[ -n x ]], just like
- the test command. Similarly for [[ x && expr ]] or
- [[ x || expr ]] or [[ (x) ]]. */
- op = make_word ("-n");
- term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL);
- cond_token = tok;
- return (term);
- }
- else
- {
- if (etext = error_token_from_token (tok))
- {
- parser_error (line_number, _("unexpected token `%s', conditional binary operator expected"), etext);
- free (etext);
- }
- else
- parser_error (line_number, _("conditional binary operator expected"));
- dispose_cond_node (tleft);
- COND_RETURN_ERROR ();
- }
-
- /* rhs */
- if (parser_state & PST_EXTPAT)
- extended_glob = 1;
- tok = read_token (READ);
- if (parser_state & PST_EXTPAT)
- extended_glob = global_extglob;
- parser_state &= ~(PST_REGEXP|PST_EXTPAT);
-
- if (tok == WORD)
- {
- tright = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
- term = make_cond_node (COND_BINARY, op, tleft, tright);
- }
- else
- {
- if (etext = error_token_from_token (tok))
- {
- parser_error (line_number, _("unexpected argument `%s' to conditional binary operator"), etext);
- free (etext);
- }
- else
- parser_error (line_number, _("unexpected argument to conditional binary operator"));
- dispose_cond_node (tleft);
- dispose_word (op);
- COND_RETURN_ERROR ();
- }
-
- (void)cond_skip_newlines ();
- }
- else
- {
- if (tok < 256)
- parser_error (line_number, _("unexpected token `%c' in conditional command"), tok);
- else if (etext = error_token_from_token (tok))
- {
- parser_error (line_number, _("unexpected token `%s' in conditional command"), etext);
- free (etext);
- }
- else
- parser_error (line_number, _("unexpected token %d in conditional command"), tok);
- COND_RETURN_ERROR ();
- }
- return (term);
-}
-
-/* This is kind of bogus -- we slip a mini recursive-descent parser in
- here to handle the conditional statement syntax. */
-static COMMAND *
-parse_cond_command ()
-{
- COND_COM *cexp;
-
- global_extglob = extended_glob;
- cexp = cond_expr ();
- return (make_cond_command (cexp));
-}
-#endif
-
-#if defined (ARRAY_VARS)
-/* When this is called, it's guaranteed that we don't care about anything
- in t beyond i. We do save and restore the chars, though. */
-static int
-token_is_assignment (t, i)
- char *t;
- int i;
-{
- unsigned char c, c1;
- int r;
-
- c = t[i]; c1 = t[i+1];
- t[i] = '='; t[i+1] = '\0';
- r = assignment (t, (parser_state & PST_COMPASSIGN) != 0);
- t[i] = c; t[i+1] = c1;
- return r;
-}
-
-/* XXX - possible changes here for `+=' */
-static int
-token_is_ident (t, i)
- char *t;
- int i;
-{
- unsigned char c;
- int r;
-
- c = t[i];
- t[i] = '\0';
- r = legal_identifier (t);
- t[i] = c;
- return r;
-}
-#endif
-
-static int
-read_token_word (character)
- int character;
-{
- /* The value for YYLVAL when a WORD is read. */
- WORD_DESC *the_word;
-
- /* Index into the token that we are building. */
- int token_index;
-
- /* ALL_DIGITS becomes zero when we see a non-digit. */
- int all_digit_token;
-
- /* DOLLAR_PRESENT becomes non-zero if we see a `$'. */
- int dollar_present;
-
- /* COMPOUND_ASSIGNMENT becomes non-zero if we are parsing a compound
- assignment. */
- int compound_assignment;
-
- /* QUOTED becomes non-zero if we see one of ("), ('), (`), or (\). */
- int quoted;
-
- /* Non-zero means to ignore the value of the next character, and just
- to add it no matter what. */
- int pass_next_character;
-
- /* The current delimiting character. */
- int cd;
- int result, peek_char;
- char *ttok, *ttrans;
- int ttoklen, ttranslen;
- intmax_t lvalue;
-
- if (token_buffer_size < TOKEN_DEFAULT_INITIAL_SIZE)
- token = (char *)xrealloc (token, token_buffer_size = TOKEN_DEFAULT_INITIAL_SIZE);
-
- token_index = 0;
- all_digit_token = DIGIT (character);
- dollar_present = quoted = pass_next_character = compound_assignment = 0;
-
- for (;;)
- {
- if (character == EOF)
- goto got_token;
-
- if (pass_next_character)
- {
- pass_next_character = 0;
- goto got_escaped_character;
- }
-
- cd = current_delimiter (dstack);
-
- /* Handle backslashes. Quote lots of things when not inside of
- double-quotes, quote some things inside of double-quotes. */
- if MBTEST(character == '\\')
- {
- peek_char = shell_getc (0);
-
- /* Backslash-newline is ignored in all cases except
- when quoted with single quotes. */
- if (peek_char == '\n')
- {
- character = '\n';
- goto next_character;
- }
- else
- {
- shell_ungetc (peek_char);
-
- /* If the next character is to be quoted, note it now. */
- if (cd == 0 || cd == '`' ||
- (cd == '"' && peek_char >= 0 && (sh_syntaxtab[peek_char] & CBSDQUOTE)))
- pass_next_character++;
-
- quoted = 1;
- goto got_character;
- }
- }
-
- /* Parse a matched pair of quote characters. */
- if MBTEST(shellquote (character))
- {
- push_delimiter (dstack, character);
- ttok = parse_matched_pair (character, character, character, &ttoklen, (character == '`') ? P_COMMAND : 0);
- pop_delimiter (dstack);
- if (ttok == &matched_pair_error)
- return -1; /* Bail immediately. */
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
- token_buffer_size, TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = character;
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- all_digit_token = 0;
- quoted = 1;
- dollar_present |= (character == '"' && strchr (ttok, '$') != 0);
- FREE (ttok);
- goto next_character;
- }
-
-#ifdef COND_REGEXP
- /* When parsing a regexp as a single word inside a conditional command,
- we need to special-case characters special to both the shell and
- regular expressions. Right now, that is only '(' and '|'. */ /*)*/
- if MBTEST((parser_state & PST_REGEXP) && (character == '(' || character == '|')) /*)*/
- {
- if (character == '|')
- goto got_character;
-
- push_delimiter (dstack, character);
- ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0);
- pop_delimiter (dstack);
- if (ttok == &matched_pair_error)
- return -1; /* Bail immediately. */
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
- token_buffer_size, TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = character;
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- FREE (ttok);
- dollar_present = all_digit_token = 0;
- goto next_character;
- }
-#endif /* COND_REGEXP */
-
-#ifdef EXTENDED_GLOB
- /* Parse a ksh-style extended pattern matching specification. */
- if MBTEST(extended_glob && PATTERN_CHAR (character))
- {
- peek_char = shell_getc (1);
- if MBTEST(peek_char == '(') /* ) */
- {
- push_delimiter (dstack, peek_char);
- ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0);
- pop_delimiter (dstack);
- if (ttok == &matched_pair_error)
- return -1; /* Bail immediately. */
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = character;
- token[token_index++] = peek_char;
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- FREE (ttok);
- dollar_present = all_digit_token = 0;
- goto next_character;
- }
- else
- shell_ungetc (peek_char);
- }
-#endif /* EXTENDED_GLOB */
-
- /* If the delimiter character is not single quote, parse some of
- the shell expansions that must be read as a single word. */
- if (shellexp (character))
- {
- peek_char = shell_getc (1);
- /* $(...), <(...), >(...), $((...)), ${...}, and $[...] constructs */
- if MBTEST(peek_char == '(' ||
- ((peek_char == '{' || peek_char == '[') && character == '$')) /* ) ] } */
- {
- if (peek_char == '{') /* } */
- ttok = parse_matched_pair (cd, '{', '}', &ttoklen, P_FIRSTCLOSE|P_DOLBRACE);
- else if (peek_char == '(') /* ) */
- {
- /* XXX - push and pop the `(' as a delimiter for use by
- the command-oriented-history code. This way newlines
- appearing in the $(...) string get added to the
- history literally rather than causing a possibly-
- incorrect `;' to be added. ) */
- push_delimiter (dstack, peek_char);
- ttok = parse_comsub (cd, '(', ')', &ttoklen, P_COMMAND);
- pop_delimiter (dstack);
- }
- else
- ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0);
- if (ttok == &matched_pair_error)
- return -1; /* Bail immediately. */
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = character;
- token[token_index++] = peek_char;
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- FREE (ttok);
- dollar_present = 1;
- all_digit_token = 0;
- goto next_character;
- }
- /* This handles $'...' and $"..." new-style quoted strings. */
- else if MBTEST(character == '$' && (peek_char == '\'' || peek_char == '"'))
- {
- int first_line;
-
- first_line = line_number;
- push_delimiter (dstack, peek_char);
- ttok = parse_matched_pair (peek_char, peek_char, peek_char,
- &ttoklen,
- (peek_char == '\'') ? P_ALLOWESC : 0);
- pop_delimiter (dstack);
- if (ttok == &matched_pair_error)
- return -1;
- if (peek_char == '\'')
- {
- ttrans = ansiexpand (ttok, 0, ttoklen - 1, &ttranslen);
- free (ttok);
-
- /* Insert the single quotes and correctly quote any
- embedded single quotes (allowed because P_ALLOWESC was
- passed to parse_matched_pair). */
- ttok = sh_single_quote (ttrans);
- free (ttrans);
- ttranslen = strlen (ttok);
- ttrans = ttok;
- }
- else
- {
- /* Try to locale-expand the converted string. */
- ttrans = localeexpand (ttok, 0, ttoklen - 1, first_line, &ttranslen);
- free (ttok);
-
- /* Add the double quotes back */
- ttok = sh_mkdoublequoted (ttrans, ttranslen, 0);
- free (ttrans);
- ttranslen += 2;
- ttrans = ttok;
- }
-
- RESIZE_MALLOCED_BUFFER (token, token_index, ttranslen + 1,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- strcpy (token + token_index, ttrans);
- token_index += ttranslen;
- FREE (ttrans);
- quoted = 1;
- all_digit_token = 0;
- goto next_character;
- }
- /* This could eventually be extended to recognize all of the
- shell's single-character parameter expansions, and set flags.*/
- else if MBTEST(character == '$' && peek_char == '$')
- {
- RESIZE_MALLOCED_BUFFER (token, token_index, 3,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = '$';
- token[token_index++] = peek_char;
- dollar_present = 1;
- all_digit_token = 0;
- goto next_character;
- }
- else
- shell_ungetc (peek_char);
- }
-
-#if defined (ARRAY_VARS)
- /* Identify possible array subscript assignment; match [...]. If
- parser_state&PST_COMPASSIGN, we need to parse [sub]=words treating
- `sub' as if it were enclosed in double quotes. */
- else if MBTEST(character == '[' && /* ] */
- ((token_index > 0 && assignment_acceptable (last_read_token) && token_is_ident (token, token_index)) ||
- (token_index == 0 && (parser_state&PST_COMPASSIGN))))
- {
- ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARRAYSUB);
- if (ttok == &matched_pair_error)
- return -1; /* Bail immediately. */
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = character;
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- FREE (ttok);
- all_digit_token = 0;
- goto next_character;
- }
- /* Identify possible compound array variable assignment. */
- else if MBTEST(character == '=' && token_index > 0 && (assignment_acceptable (last_read_token) || (parser_state & PST_ASSIGNOK)) && token_is_assignment (token, token_index))
- {
- peek_char = shell_getc (1);
- if MBTEST(peek_char == '(') /* ) */
- {
- ttok = parse_compound_assignment (&ttoklen);
-
- RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 4,
- token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
-
- token[token_index++] = '=';
- token[token_index++] = '(';
- if (ttok)
- {
- strcpy (token + token_index, ttok);
- token_index += ttoklen;
- }
- token[token_index++] = ')';
- FREE (ttok);
- all_digit_token = 0;
- compound_assignment = 1;
-#if 1
- goto next_character;
-#else
- goto got_token; /* ksh93 seems to do this */
-#endif
- }
- else
- shell_ungetc (peek_char);
- }
-#endif
-
- /* When not parsing a multi-character word construct, shell meta-
- characters break words. */
- if MBTEST(shellbreak (character))
- {
- shell_ungetc (character);
- goto got_token;
- }
-
-got_character:
-
- if (character == CTLESC || character == CTLNUL)
- {
- RESIZE_MALLOCED_BUFFER (token, token_index, 2, token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
- token[token_index++] = CTLESC;
- }
- else
-got_escaped_character:
- RESIZE_MALLOCED_BUFFER (token, token_index, 1, token_buffer_size,
- TOKEN_DEFAULT_GROW_SIZE);
-
- token[token_index++] = character;
-
- all_digit_token &= DIGIT (character);
- dollar_present |= character == '$';
-
- next_character:
- if (character == '\n' && SHOULD_PROMPT ())
- prompt_again ();
-
- /* We want to remove quoted newlines (that is, a \<newline> pair)
- unless we are within single quotes or pass_next_character is
- set (the shell equivalent of literal-next). */
- cd = current_delimiter (dstack);
- character = shell_getc (cd != '\'' && pass_next_character == 0);
- } /* end for (;;) */
-
-got_token:
-
- /* Calls to RESIZE_MALLOCED_BUFFER ensure there is sufficient room. */
- token[token_index] = '\0';
-
- /* Check to see what thing we should return. If the last_read_token
- is a `<', or a `&', or the character which ended this token is
- a '>' or '<', then, and ONLY then, is this input token a NUMBER.
- Otherwise, it is just a word, and should be returned as such. */
- if MBTEST(all_digit_token && (character == '<' || character == '>' ||
- last_read_token == LESS_AND ||
- last_read_token == GREATER_AND))
- {
- if (legal_number (token, &lvalue) && (int)lvalue == lvalue)
- {
- yylval.number = lvalue;
- return (NUMBER);
- }
- }
-
- /* Check for special case tokens. */
- result = (last_shell_getc_is_singlebyte) ? special_case_tokens (token) : -1;
- if (result >= 0)
- return result;
-
-#if defined (ALIAS)
- /* Posix.2 does not allow reserved words to be aliased, so check for all
- of them, including special cases, before expanding the current token
- as an alias. */
- if MBTEST(posixly_correct)
- CHECK_FOR_RESERVED_WORD (token);
-
- /* Aliases are expanded iff EXPAND_ALIASES is non-zero, and quoting
- inhibits alias expansion. */
- if (expand_aliases && quoted == 0)
- {
- result = alias_expand_token (token);
- if (result == RE_READ_TOKEN)
- return (RE_READ_TOKEN);
- else if (result == NO_EXPANSION)
- parser_state &= ~PST_ALEXPNEXT;
- }
-
- /* If not in Posix.2 mode, check for reserved words after alias
- expansion. */
- if MBTEST(posixly_correct == 0)
-#endif
- CHECK_FOR_RESERVED_WORD (token);
-
- the_word = (WORD_DESC *)xmalloc (sizeof (WORD_DESC));
- the_word->word = (char *)xmalloc (1 + token_index);
- the_word->flags = 0;
- strcpy (the_word->word, token);
- if (dollar_present)
- the_word->flags |= W_HASDOLLAR;
- if (quoted)
- the_word->flags |= W_QUOTED; /*(*/
- if (compound_assignment && token[token_index-1] == ')')
- the_word->flags |= W_COMPASSIGN;
- /* A word is an assignment if it appears at the beginning of a
- simple command, or after another assignment word. This is
- context-dependent, so it cannot be handled in the grammar. */
- if (assignment (token, (parser_state & PST_COMPASSIGN) != 0))
- {
- the_word->flags |= W_ASSIGNMENT;
- /* Don't perform word splitting on assignment statements. */
- if (assignment_acceptable (last_read_token) || (parser_state & PST_COMPASSIGN) != 0)
- {
- the_word->flags |= W_NOSPLIT;
- if (parser_state & PST_COMPASSIGN)
- the_word->flags |= W_NOGLOB; /* XXX - W_NOBRACE? */
- }
- }
-
- if (command_token_position (last_read_token))
- {
- struct builtin *b;
- b = builtin_address_internal (token, 0);
- if (b && (b->flags & ASSIGNMENT_BUILTIN))
- parser_state |= PST_ASSIGNOK;
- else if (STREQ (token, "eval") || STREQ (token, "let"))
- parser_state |= PST_ASSIGNOK;
- }
-
- yylval.word = the_word;
-
- if (token[0] == '{' && token[token_index-1] == '}' &&
- (character == '<' || character == '>'))
- {
- /* can use token; already copied to the_word */
- token[token_index-1] = '\0';
-#if defined (ARRAY_VARS)
- if (legal_identifier (token+1) || valid_array_reference (token+1))
-#else
- if (legal_identifier (token+1))
-#endif
- {
- strcpy (the_word->word, token+1);
-/*itrace("read_token_word: returning REDIR_WORD for %s", the_word->word);*/
- return (REDIR_WORD);
- }
- }
-
- result = ((the_word->flags & (W_ASSIGNMENT|W_NOSPLIT)) == (W_ASSIGNMENT|W_NOSPLIT))
- ? ASSIGNMENT_WORD : WORD;
-
- switch (last_read_token)
- {
- case FUNCTION:
- parser_state |= PST_ALLOWOPNBRC;
- function_dstart = line_number;
- break;
- case CASE:
- case SELECT:
- case FOR:
- if (word_top < MAX_CASE_NEST)
- word_top++;
- word_lineno[word_top] = line_number;
- break;
- }
-
- return (result);
-}
-
-/* Return 1 if TOKSYM is a token that after being read would allow
- a reserved word to be seen, else 0. */
-static int
-reserved_word_acceptable (toksym)
- int toksym;
-{
- switch (toksym)
- {
- case '\n':
- case ';':
- case '(':
- case ')':
- case '|':
- case '&':
- case '{':
- case '}': /* XXX */
- case AND_AND:
- case BANG:
- case BAR_AND:
- case DO:
- case DONE:
- case ELIF:
- case ELSE:
- case ESAC:
- case FI:
- case IF:
- case OR_OR:
- case SEMI_SEMI:
- case SEMI_AND:
- case SEMI_SEMI_AND:
- case THEN:
- case TIME:
- case TIMEOPT:
- case TIMEIGN:
- case COPROC:
- case UNTIL:
- case WHILE:
- case 0:
- return 1;
- default:
-#if defined (COPROCESS_SUPPORT)
- if (last_read_token == WORD && token_before_that == COPROC)
- return 1;
-#endif
- if (last_read_token == WORD && token_before_that == FUNCTION)
- return 1;
- return 0;
- }
-}
-
-/* Return the index of TOKEN in the alist of reserved words, or -1 if
- TOKEN is not a shell reserved word. */
-int
-find_reserved_word (tokstr)
- char *tokstr;
-{
- int i;
- for (i = 0; word_token_alist[i].word; i++)
- if (STREQ (tokstr, word_token_alist[i].word))
- return i;
- return -1;
-}
-
-/* An interface to let the rest of the shell (primarily the completion
- system) know what the parser is expecting. */
-int
-parser_in_command_position ()
-{
- return (command_token_position (last_read_token));
-}
-
-#if 0
-#if defined (READLINE)
-/* Called after each time readline is called. This insures that whatever
- the new prompt string is gets propagated to readline's local prompt
- variable. */
-static void
-reset_readline_prompt ()
-{
- char *temp_prompt;
-
- if (prompt_string_pointer)
- {
- temp_prompt = (*prompt_string_pointer)
- ? decode_prompt_string (*prompt_string_pointer)
- : (char *)NULL;
-
- if (temp_prompt == 0)
- {
- temp_prompt = (char *)xmalloc (1);
- temp_prompt[0] = '\0';
- }
-
- FREE (current_readline_prompt);
- current_readline_prompt = temp_prompt;
- }
-}
-#endif /* READLINE */
-#endif /* 0 */
-
-#if defined (HISTORY)
-/* A list of tokens which can be followed by newlines, but not by
- semi-colons. When concatenating multiple lines of history, the
- newline separator for such tokens is replaced with a space. */
-static const int no_semi_successors[] = {
- '\n', '{', '(', ')', ';', '&', '|',
- CASE, DO, ELSE, IF, SEMI_SEMI, SEMI_AND, SEMI_SEMI_AND, THEN, UNTIL,
- WHILE, AND_AND, OR_OR, IN,
- 0
-};
-
-/* If we are not within a delimited expression, try to be smart
- about which separators can be semi-colons and which must be
- newlines. Returns the string that should be added into the
- history entry. LINE is the line we're about to add; it helps
- make some more intelligent decisions in certain cases. */
-char *
-history_delimiting_chars (line)
- const char *line;
-{
- static int last_was_heredoc = 0; /* was the last entry the start of a here document? */
- register int i;
-
- if ((parser_state & PST_HEREDOC) == 0)
- last_was_heredoc = 0;
-
- if (dstack.delimiter_depth != 0)
- return ("\n");
-
- /* We look for current_command_line_count == 2 because we are looking to
- add the first line of the body of the here document (the second line
- of the command). We also keep LAST_WAS_HEREDOC as a private sentinel
- variable to note when we think we added the first line of a here doc
- (the one with a "<<" somewhere in it) */
- if (parser_state & PST_HEREDOC)
- {
- if (last_was_heredoc)
- {
- last_was_heredoc = 0;
- return "\n";
- }
- return (current_command_line_count == 2 ? "\n" : "");
- }
-
- if (parser_state & PST_COMPASSIGN)
- return (" ");
-
- /* First, handle some special cases. */
- /*(*/
- /* If we just read `()', assume it's a function definition, and don't
- add a semicolon. If the token before the `)' was not `(', and we're
- not in the midst of parsing a case statement, assume it's a
- parenthesized command and add the semicolon. */
- /*)(*/
- if (token_before_that == ')')
- {
- if (two_tokens_ago == '(') /*)*/ /* function def */
- return " ";
- /* This does not work for subshells inside case statement
- command lists. It's a suboptimal solution. */
- else if (parser_state & PST_CASESTMT) /* case statement pattern */
- return " ";
- else
- return "; "; /* (...) subshell */
- }
- else if (token_before_that == WORD && two_tokens_ago == FUNCTION)
- return " "; /* function def using `function name' without `()' */
-
- /* If we're not in a here document, but we think we're about to parse one,
- and we would otherwise return a `;', return a newline to delimit the
- line with the here-doc delimiter */
- else if ((parser_state & PST_HEREDOC) == 0 && current_command_line_count > 1 && last_read_token == '\n' && strstr (line, "<<"))
- {
- last_was_heredoc = 1;
- return "\n";
- }
-
- else if (token_before_that == WORD && two_tokens_ago == FOR)
- {
- /* Tricky. `for i\nin ...' should not have a semicolon, but
- `for i\ndo ...' should. We do what we can. */
- for (i = shell_input_line_index; whitespace (shell_input_line[i]); i++)
- ;
- if (shell_input_line[i] && shell_input_line[i] == 'i' && shell_input_line[i+1] == 'n')
- return " ";
- return ";";
- }
- else if (two_tokens_ago == CASE && token_before_that == WORD && (parser_state & PST_CASESTMT))
- return " ";
-
- for (i = 0; no_semi_successors[i]; i++)
- {
- if (token_before_that == no_semi_successors[i])
- return (" ");
- }
-
- return ("; ");
-}
-#endif /* HISTORY */
-
-/* Issue a prompt, or prepare to issue a prompt when the next character
- is read. */
-static void
-prompt_again ()
-{
- char *temp_prompt;
-
- if (interactive == 0 || expanding_alias ()) /* XXX */
- return;
-
- ps1_prompt = get_string_value ("PS1");
- ps2_prompt = get_string_value ("PS2");
-
- if (!prompt_string_pointer)
- prompt_string_pointer = &ps1_prompt;
-
- temp_prompt = *prompt_string_pointer
- ? decode_prompt_string (*prompt_string_pointer)
- : (char *)NULL;
-
- if (temp_prompt == 0)
- {
- temp_prompt = (char *)xmalloc (1);
- temp_prompt[0] = '\0';
- }
-
- current_prompt_string = *prompt_string_pointer;
- prompt_string_pointer = &ps2_prompt;
-
-#if defined (READLINE)
- if (!no_line_editing)
- {
- FREE (current_readline_prompt);
- current_readline_prompt = temp_prompt;
- }
- else
-#endif /* READLINE */
- {
- FREE (current_decoded_prompt);
- current_decoded_prompt = temp_prompt;
- }
-}
-
-int
-get_current_prompt_level ()
-{
- return ((current_prompt_string && current_prompt_string == ps2_prompt) ? 2 : 1);
-}
-
-void
-set_current_prompt_level (x)
- int x;
-{
- prompt_string_pointer = (x == 2) ? &ps2_prompt : &ps1_prompt;
- current_prompt_string = *prompt_string_pointer;
-}
-
-static void
-print_prompt ()
-{
- fprintf (stderr, "%s", current_decoded_prompt);
- fflush (stderr);
-}
-
-/* Return a string which will be printed as a prompt. The string
- may contain special characters which are decoded as follows:
-
- \a bell (ascii 07)
- \d the date in Day Mon Date format
- \e escape (ascii 033)
- \h the hostname up to the first `.'
- \H the hostname
- \j the number of active jobs
- \l the basename of the shell's tty device name
- \n CRLF
- \r CR
- \s the name of the shell
- \t the time in 24-hour hh:mm:ss format
- \T the time in 12-hour hh:mm:ss format
- \@ the time in 12-hour hh:mm am/pm format
- \A the time in 24-hour hh:mm format
- \D{fmt} the result of passing FMT to strftime(3)
- \u your username
- \v the version of bash (e.g., 2.00)
- \V the release of bash, version + patchlevel (e.g., 2.00.0)
- \w the current working directory
- \W the last element of $PWD
- \! the history number of this command
- \# the command number of this command
- \$ a $ or a # if you are root
- \nnn character code nnn in octal
- \\ a backslash
- \[ begin a sequence of non-printing chars
- \] end a sequence of non-printing chars
-*/
-#define PROMPT_GROWTH 48
-char *
-decode_prompt_string (string)
- char *string;
-{
- WORD_LIST *list;
- char *result, *t;
- struct dstack save_dstack;
- int last_exit_value, last_comsub_pid;
-#if defined (PROMPT_STRING_DECODE)
- int result_size, result_index;
- int c, n, i;
- char *temp, octal_string[4];
- struct tm *tm;
- time_t the_time;
- char timebuf[128];
- char *timefmt;
-
- result = (char *)xmalloc (result_size = PROMPT_GROWTH);
- result[result_index = 0] = 0;
- temp = (char *)NULL;
-
- while (c = *string++)
- {
- if (posixly_correct && c == '!')
- {
- if (*string == '!')
- {
- temp = savestring ("!");
- goto add_string;
- }
- else
- {
-#if !defined (HISTORY)
- temp = savestring ("1");
-#else /* HISTORY */
- temp = itos (history_number ());
-#endif /* HISTORY */
- string--; /* add_string increments string again. */
- goto add_string;
- }
- }
- if (c == '\\')
- {
- c = *string;
-
- switch (c)
- {
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- strncpy (octal_string, string, 3);
- octal_string[3] = '\0';
-
- n = read_octal (octal_string);
- temp = (char *)xmalloc (3);
-
- if (n == CTLESC || n == CTLNUL)
- {
- temp[0] = CTLESC;
- temp[1] = n;
- temp[2] = '\0';
- }
- else if (n == -1)
- {
- temp[0] = '\\';
- temp[1] = '\0';
- }
- else
- {
- temp[0] = n;
- temp[1] = '\0';
- }
-
- for (c = 0; n != -1 && c < 3 && ISOCTAL (*string); c++)
- string++;
-
- c = 0; /* tested at add_string: */
- goto add_string;
-
- case 'd':
- case 't':
- case 'T':
- case '@':
- case 'A':
- /* Make the current time/date into a string. */
- (void) time (&the_time);
-#if defined (HAVE_TZSET)
- sv_tz ("TZ"); /* XXX -- just make sure */
-#endif
- tm = localtime (&the_time);
-
- if (c == 'd')
- n = strftime (timebuf, sizeof (timebuf), "%a %b %d", tm);
- else if (c == 't')
- n = strftime (timebuf, sizeof (timebuf), "%H:%M:%S", tm);
- else if (c == 'T')
- n = strftime (timebuf, sizeof (timebuf), "%I:%M:%S", tm);
- else if (c == '@')
- n = strftime (timebuf, sizeof (timebuf), "%I:%M %p", tm);
- else if (c == 'A')
- n = strftime (timebuf, sizeof (timebuf), "%H:%M", tm);
-
- if (n == 0)
- timebuf[0] = '\0';
- else
- timebuf[sizeof(timebuf) - 1] = '\0';
-
- temp = savestring (timebuf);
- goto add_string;
-
- case 'D': /* strftime format */
- if (string[1] != '{') /* } */
- goto not_escape;
-
- (void) time (&the_time);
- tm = localtime (&the_time);
- string += 2; /* skip { */
- timefmt = xmalloc (strlen (string) + 3);
- for (t = timefmt; *string && *string != '}'; )
- *t++ = *string++;
- *t = '\0';
- c = *string; /* tested at add_string */
- if (timefmt[0] == '\0')
- {
- timefmt[0] = '%';
- timefmt[1] = 'X'; /* locale-specific current time */
- timefmt[2] = '\0';
- }
- n = strftime (timebuf, sizeof (timebuf), timefmt, tm);
- free (timefmt);
-
- if (n == 0)
- timebuf[0] = '\0';
- else
- timebuf[sizeof(timebuf) - 1] = '\0';
-
- if (promptvars || posixly_correct)
- /* Make sure that expand_prompt_string is called with a
- second argument of Q_DOUBLE_QUOTES if we use this
- function here. */
- temp = sh_backslash_quote_for_double_quotes (timebuf);
- else
- temp = savestring (timebuf);
- goto add_string;
-
- case 'n':
- temp = (char *)xmalloc (3);
- temp[0] = no_line_editing ? '\n' : '\r';
- temp[1] = no_line_editing ? '\0' : '\n';
- temp[2] = '\0';
- goto add_string;
-
- case 's':
- temp = base_pathname (shell_name);
- temp = savestring (temp);
- goto add_string;
-
- case 'v':
- case 'V':
- temp = (char *)xmalloc (16);
- if (c == 'v')
- strcpy (temp, dist_version);
- else
- sprintf (temp, "%s.%d", dist_version, patch_level);
- goto add_string;
-
- case 'w':
- case 'W':
- {
- /* Use the value of PWD because it is much more efficient. */
- char t_string[PATH_MAX];
- int tlen;
-
- temp = get_string_value ("PWD");
-
- if (temp == 0)
- {
- if (getcwd (t_string, sizeof(t_string)) == 0)
- {
- t_string[0] = '.';
- tlen = 1;
- }
- else
- tlen = strlen (t_string);
- }
- else
- {
- tlen = sizeof (t_string) - 1;
- strncpy (t_string, temp, tlen);
- }
- t_string[tlen] = '\0';
-
-#if defined (MACOSX)
- /* Convert from "fs" format to "input" format */
- temp = fnx_fromfs (t_string, strlen (t_string));
- if (temp != t_string)
- strcpy (t_string, temp);
-#endif
-
-#define ROOT_PATH(x) ((x)[0] == '/' && (x)[1] == 0)
-#define DOUBLE_SLASH_ROOT(x) ((x)[0] == '/' && (x)[1] == '/' && (x)[2] == 0)
- /* Abbreviate \W as ~ if $PWD == $HOME */
- if (c == 'W' && (((t = get_string_value ("HOME")) == 0) || STREQ (t, t_string) == 0))
- {
- if (ROOT_PATH (t_string) == 0 && DOUBLE_SLASH_ROOT (t_string) == 0)
- {
- t = strrchr (t_string, '/');
- if (t)
- memmove (t_string, t + 1, strlen (t)); /* strlen(t) to copy NULL */
- }
- }
-#undef ROOT_PATH
-#undef DOUBLE_SLASH_ROOT
- else
- {
- /* polite_directory_format is guaranteed to return a string
- no longer than PATH_MAX - 1 characters. */
- temp = polite_directory_format (t_string);
- if (temp != t_string)
- strcpy (t_string, temp);
- }
-
- temp = trim_pathname (t_string, PATH_MAX - 1);
- /* If we're going to be expanding the prompt string later,
- quote the directory name. */
- if (promptvars || posixly_correct)
- /* Make sure that expand_prompt_string is called with a
- second argument of Q_DOUBLE_QUOTES if we use this
- function here. */
- temp = sh_backslash_quote_for_double_quotes (t_string);
- else
- temp = savestring (t_string);
-
- goto add_string;
- }
-
- case 'u':
- if (current_user.user_name == 0)
- get_current_user_info ();
- temp = savestring (current_user.user_name);
- goto add_string;
-
- case 'h':
- case 'H':
- temp = savestring (current_host_name);
- if (c == 'h' && (t = (char *)strchr (temp, '.')))
- *t = '\0';
- goto add_string;
-
- case '#':
- temp = itos (current_command_number);
- goto add_string;
-
- case '!':
-#if !defined (HISTORY)
- temp = savestring ("1");
-#else /* HISTORY */
- temp = itos (history_number ());
-#endif /* HISTORY */
- goto add_string;
-
- case '$':
- t = temp = (char *)xmalloc (3);
- if ((promptvars || posixly_correct) && (current_user.euid != 0))
- *t++ = '\\';
- *t++ = current_user.euid == 0 ? '#' : '$';
- *t = '\0';
- goto add_string;
-
- case 'j':
- temp = itos (count_all_jobs ());
- goto add_string;
-
- case 'l':
-#if defined (HAVE_TTYNAME)
- temp = (char *)ttyname (fileno (stdin));
- t = temp ? base_pathname (temp) : "tty";
- temp = savestring (t);
-#else
- temp = savestring ("tty");
-#endif /* !HAVE_TTYNAME */
- goto add_string;
-
-#if defined (READLINE)
- case '[':
- case ']':
- if (no_line_editing)
- {
- string++;
- break;
- }
- temp = (char *)xmalloc (3);
- n = (c == '[') ? RL_PROMPT_START_IGNORE : RL_PROMPT_END_IGNORE;
- i = 0;
- if (n == CTLESC || n == CTLNUL)
- temp[i++] = CTLESC;
- temp[i++] = n;
- temp[i] = '\0';
- goto add_string;
-#endif /* READLINE */
-
- case '\\':
- case 'a':
- case 'e':
- case 'r':
- temp = (char *)xmalloc (2);
- if (c == 'a')
- temp[0] = '\07';
- else if (c == 'e')
- temp[0] = '\033';
- else if (c == 'r')
- temp[0] = '\r';
- else /* (c == '\\') */
- temp[0] = c;
- temp[1] = '\0';
- goto add_string;
-
- default:
-not_escape:
- temp = (char *)xmalloc (3);
- temp[0] = '\\';
- temp[1] = c;
- temp[2] = '\0';
-
- add_string:
- if (c)
- string++;
- result =
- sub_append_string (temp, result, &result_index, &result_size);
- temp = (char *)NULL; /* Freed in sub_append_string (). */
- result[result_index] = '\0';
- break;
- }
- }
- else
- {
- RESIZE_MALLOCED_BUFFER (result, result_index, 3, result_size, PROMPT_GROWTH);
- result[result_index++] = c;
- result[result_index] = '\0';
- }
- }
-#else /* !PROMPT_STRING_DECODE */
- result = savestring (string);
-#endif /* !PROMPT_STRING_DECODE */
-
- /* Save the delimiter stack and point `dstack' to temp space so any
- command substitutions in the prompt string won't result in screwing
- up the parser's quoting state. */
- save_dstack = dstack;
- dstack = temp_dstack;
- dstack.delimiter_depth = 0;
-
- /* Perform variable and parameter expansion and command substitution on
- the prompt string. */
- if (promptvars || posixly_correct)
- {
- last_exit_value = last_command_exit_value;
- last_comsub_pid = last_command_subst_pid;
- list = expand_prompt_string (result, Q_DOUBLE_QUOTES, 0);
- free (result);
- result = string_list (list);
- dispose_words (list);
- last_command_exit_value = last_exit_value;
- last_command_subst_pid = last_comsub_pid;
- }
- else
- {
- t = dequote_string (result);
- free (result);
- result = t;
- }
-
- dstack = save_dstack;
-
- return (result);
-}
-
-/************************************************
- * *
- * ERROR HANDLING *
- * *
- ************************************************/
-
-/* Report a syntax error, and restart the parser. Call here for fatal
- errors. */
-int
-yyerror (msg)
- const char *msg;
-{
- report_syntax_error ((char *)NULL);
- reset_parser ();
- return (0);
-}
-
-static char *
-error_token_from_token (tok)
- int tok;
-{
- char *t;
-
- if (t = find_token_in_alist (tok, word_token_alist, 0))
- return t;
-
- if (t = find_token_in_alist (tok, other_token_alist, 0))
- return t;
-
- t = (char *)NULL;
- /* This stuff is dicy and needs closer inspection */
- switch (current_token)
- {
- case WORD:
- case ASSIGNMENT_WORD:
- if (yylval.word)
- t = savestring (yylval.word->word);
- break;
- case NUMBER:
- t = itos (yylval.number);
- break;
- case ARITH_CMD:
- if (yylval.word_list)
- t = string_list (yylval.word_list);
- break;
- case ARITH_FOR_EXPRS:
- if (yylval.word_list)
- t = string_list_internal (yylval.word_list, " ; ");
- break;
- case COND_CMD:
- t = (char *)NULL; /* punt */
- break;
- }
-
- return t;
-}
-
-static char *
-error_token_from_text ()
-{
- char *msg, *t;
- int token_end, i;
-
- t = shell_input_line;
- i = shell_input_line_index;
- token_end = 0;
- msg = (char *)NULL;
-
- if (i && t[i] == '\0')
- i--;
-
- while (i && (whitespace (t[i]) || t[i] == '\n'))
- i--;
-
- if (i)
- token_end = i + 1;
-
- while (i && (member (t[i], " \n\t;|&") == 0))
- i--;
-
- while (i != token_end && (whitespace (t[i]) || t[i] == '\n'))
- i++;
-
- /* Return our idea of the offending token. */
- if (token_end || (i == 0 && token_end == 0))
- {
- if (token_end)
- msg = substring (t, i, token_end);
- else /* one-character token */
- {
- msg = (char *)xmalloc (2);
- msg[0] = t[i];
- msg[1] = '\0';
- }
- }
-
- return (msg);
-}
-
-static void
-print_offending_line ()
-{
- char *msg;
- int token_end;
-
- msg = savestring (shell_input_line);
- token_end = strlen (msg);
- while (token_end && msg[token_end - 1] == '\n')
- msg[--token_end] = '\0';
-
- parser_error (line_number, "`%s'", msg);
- free (msg);
-}
-
-/* Report a syntax error with line numbers, etc.
- Call here for recoverable errors. If you have a message to print,
- then place it in MESSAGE, otherwise pass NULL and this will figure
- out an appropriate message for you. */
-static void
-report_syntax_error (message)
- char *message;
-{
- char *msg, *p;
-
- if (message)
- {
- parser_error (line_number, "%s", message);
- if (interactive && EOF_Reached)
- EOF_Reached = 0;
- last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
- return;
- }
-
- /* If the line of input we're reading is not null, try to find the
- objectionable token. First, try to figure out what token the
- parser's complaining about by looking at current_token. */
- if (current_token != 0 && EOF_Reached == 0 && (msg = error_token_from_token (current_token)))
- {
- if (ansic_shouldquote (msg))
- {
- p = ansic_quote (msg, 0, NULL);
- free (msg);
- msg = p;
- }
- parser_error (line_number, _("syntax error near unexpected token `%s'"), msg);
- free (msg);
-
- if (interactive == 0)
- print_offending_line ();
-
- last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
- return;
- }
-
- /* If looking at the current token doesn't prove fruitful, try to find the
- offending token by analyzing the text of the input line near the current
- input line index and report what we find. */
- if (shell_input_line && *shell_input_line)
- {
- msg = error_token_from_text ();
- if (msg)
- {
- parser_error (line_number, _("syntax error near `%s'"), msg);
- free (msg);
- }
-
- /* If not interactive, print the line containing the error. */
- if (interactive == 0)
- print_offending_line ();
- }
- else
- {
- msg = EOF_Reached ? _("syntax error: unexpected end of file") : _("syntax error");
- parser_error (line_number, "%s", msg);
- /* When the shell is interactive, this file uses EOF_Reached
- only for error reporting. Other mechanisms are used to
- decide whether or not to exit. */
- if (interactive && EOF_Reached)
- EOF_Reached = 0;
- }
-
- last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
-}
-
-/* ??? Needed function. ??? We have to be able to discard the constructs
- created during parsing. In the case of error, we want to return
- allocated objects to the memory pool. In the case of no error, we want
- to throw away the information about where the allocated objects live.
- (dispose_command () will actually free the command.) */
-static void
-discard_parser_constructs (error_p)
- int error_p;
-{
-}
-
-/************************************************
- * *
- * EOF HANDLING *
- * *
- ************************************************/
-
-/* Do that silly `type "bye" to exit' stuff. You know, "ignoreeof". */
-
-/* A flag denoting whether or not ignoreeof is set. */
-int ignoreeof = 0;
-
-/* The number of times that we have encountered an EOF character without
- another character intervening. When this gets above the limit, the
- shell terminates. */
-int eof_encountered = 0;
-
-/* The limit for eof_encountered. */
-int eof_encountered_limit = 10;
-
-/* If we have EOF as the only input unit, this user wants to leave
- the shell. If the shell is not interactive, then just leave.
- Otherwise, if ignoreeof is set, and we haven't done this the
- required number of times in a row, print a message. */
-static void
-handle_eof_input_unit ()
-{
- if (interactive)
- {
- /* shell.c may use this to decide whether or not to write out the
- history, among other things. We use it only for error reporting
- in this file. */
- if (EOF_Reached)
- EOF_Reached = 0;
-
- /* If the user wants to "ignore" eof, then let her do so, kind of. */
- if (ignoreeof)
- {
- if (eof_encountered < eof_encountered_limit)
- {
- fprintf (stderr, _("Use \"%s\" to leave the shell.\n"),
- login_shell ? "logout" : "exit");
- eof_encountered++;
- /* Reset the parsing state. */
- last_read_token = current_token = '\n';
- /* Reset the prompt string to be $PS1. */
- prompt_string_pointer = (char **)NULL;
- prompt_again ();
- return;
- }
- }
-
- /* In this case EOF should exit the shell. Do it now. */
- reset_parser ();
- exit_builtin ((WORD_LIST *)NULL);
- }
- else
- {
- /* We don't write history files, etc., for non-interactive shells. */
- EOF_Reached = 1;
- }
-}
-
-/************************************************
- * *
- * STRING PARSING FUNCTIONS *
- * *
- ************************************************/
-
-/* It's very important that these two functions treat the characters
- between ( and ) identically. */
-
-static WORD_LIST parse_string_error;
-
-/* Take a string and run it through the shell parser, returning the
- resultant word list. Used by compound array assignment. */
-WORD_LIST *
-parse_string_to_word_list (s, flags, whom)
- char *s;
- int flags;
- const char *whom;
-{
- WORD_LIST *wl;
- int tok, orig_current_token, orig_line_number, orig_input_terminator;
- int orig_line_count;
- int old_echo_input, old_expand_aliases;
-#if defined (HISTORY)
- int old_remember_on_history, old_history_expansion_inhibited;
-#endif
-
-#if defined (HISTORY)
- old_remember_on_history = remember_on_history;
-# if defined (BANG_HISTORY)
- old_history_expansion_inhibited = history_expansion_inhibited;
-# endif
- bash_history_disable ();
-#endif
-
- orig_line_number = line_number;
- orig_line_count = current_command_line_count;
- orig_input_terminator = shell_input_line_terminator;
- old_echo_input = echo_input_at_read;
- old_expand_aliases = expand_aliases;
-
- push_stream (1);
- last_read_token = WORD; /* WORD to allow reserved words here */
- current_command_line_count = 0;
- echo_input_at_read = expand_aliases = 0;
-
- with_input_from_string (s, whom);
- wl = (WORD_LIST *)NULL;
-
- if (flags & 1)
- parser_state |= PST_COMPASSIGN|PST_REPARSE;
-
- while ((tok = read_token (READ)) != yacc_EOF)
- {
- if (tok == '\n' && *bash_input.location.string == '\0')
- break;
- if (tok == '\n') /* Allow newlines in compound assignments */
- continue;
- if (tok != WORD && tok != ASSIGNMENT_WORD)
- {
- line_number = orig_line_number + line_number - 1;
- orig_current_token = current_token;
- current_token = tok;
- yyerror (NULL); /* does the right thing */
- current_token = orig_current_token;
- if (wl)
- dispose_words (wl);
- wl = &parse_string_error;
- break;
- }
- wl = make_word_list (yylval.word, wl);
- }
-
- last_read_token = '\n';
- pop_stream ();
-
-#if defined (HISTORY)
- remember_on_history = old_remember_on_history;
-# if defined (BANG_HISTORY)
- history_expansion_inhibited = old_history_expansion_inhibited;
-# endif /* BANG_HISTORY */
-#endif /* HISTORY */
-
- echo_input_at_read = old_echo_input;
- expand_aliases = old_expand_aliases;
-
- current_command_line_count = orig_line_count;
- shell_input_line_terminator = orig_input_terminator;
-
- if (flags & 1)
- parser_state &= ~(PST_COMPASSIGN|PST_REPARSE);
-
- if (wl == &parse_string_error)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- if (interactive_shell == 0 && posixly_correct)
- jump_to_top_level (FORCE_EOF);
- else
- jump_to_top_level (DISCARD);
- }
-
- return (REVERSE_LIST (wl, WORD_LIST *));
-}
-
-static char *
-parse_compound_assignment (retlenp)
- int *retlenp;
-{
- WORD_LIST *wl, *rl;
- int tok, orig_line_number, orig_token_size, orig_last_token, assignok;
- char *saved_token, *ret;
-
- saved_token = token;
- orig_token_size = token_buffer_size;
- orig_line_number = line_number;
- orig_last_token = last_read_token;
-
- last_read_token = WORD; /* WORD to allow reserved words here */
-
- token = (char *)NULL;
- token_buffer_size = 0;
-
- assignok = parser_state&PST_ASSIGNOK; /* XXX */
-
- wl = (WORD_LIST *)NULL; /* ( */
- parser_state |= PST_COMPASSIGN;
-
- while ((tok = read_token (READ)) != ')')
- {
- if (tok == '\n') /* Allow newlines in compound assignments */
- {
- if (SHOULD_PROMPT ())
- prompt_again ();
- continue;
- }
- if (tok != WORD && tok != ASSIGNMENT_WORD)
- {
- current_token = tok; /* for error reporting */
- if (tok == yacc_EOF) /* ( */
- parser_error (orig_line_number, _("unexpected EOF while looking for matching `)'"));
- else
- yyerror(NULL); /* does the right thing */
- if (wl)
- dispose_words (wl);
- wl = &parse_string_error;
- break;
- }
- wl = make_word_list (yylval.word, wl);
- }
-
- FREE (token);
- token = saved_token;
- token_buffer_size = orig_token_size;
-
- parser_state &= ~PST_COMPASSIGN;
-
- if (wl == &parse_string_error)
- {
- last_command_exit_value = EXECUTION_FAILURE;
- last_read_token = '\n'; /* XXX */
- if (interactive_shell == 0 && posixly_correct)
- jump_to_top_level (FORCE_EOF);
- else
- jump_to_top_level (DISCARD);
- }
-
- last_read_token = orig_last_token; /* XXX - was WORD? */
-
- if (wl)
- {
- rl = REVERSE_LIST (wl, WORD_LIST *);
- ret = string_list (rl);
- dispose_words (rl);
- }
- else
- ret = (char *)NULL;
-
- if (retlenp)
- *retlenp = (ret && *ret) ? strlen (ret) : 0;
-
- if (assignok)
- parser_state |= PST_ASSIGNOK;
-
- return ret;
-}
-
-/************************************************
- * *
- * SAVING AND RESTORING PARTIAL PARSE STATE *
- * *
- ************************************************/
-
-sh_parser_state_t *
-save_parser_state (ps)
- sh_parser_state_t *ps;
-{
- if (ps == 0)
- ps = (sh_parser_state_t *)xmalloc (sizeof (sh_parser_state_t));
- if (ps == 0)
- return ((sh_parser_state_t *)NULL);
-
- ps->parser_state = parser_state;
- ps->token_state = save_token_state ();
-
- ps->input_line_terminator = shell_input_line_terminator;
- ps->eof_encountered = eof_encountered;
-
- ps->prompt_string_pointer = prompt_string_pointer;
-
- ps->current_command_line_count = current_command_line_count;
-
-#if defined (HISTORY)
- ps->remember_on_history = remember_on_history;
-# if defined (BANG_HISTORY)
- ps->history_expansion_inhibited = history_expansion_inhibited;
-# endif
-#endif
-
- ps->last_command_exit_value = last_command_exit_value;
-#if defined (ARRAY_VARS)
- ps->pipestatus = save_pipestatus_array ();
-#endif
-
- ps->last_shell_builtin = last_shell_builtin;
- ps->this_shell_builtin = this_shell_builtin;
-
- ps->expand_aliases = expand_aliases;
- ps->echo_input_at_read = echo_input_at_read;
- ps->need_here_doc = need_here_doc;
-
- ps->token = token;
- ps->token_buffer_size = token_buffer_size;
- /* Force reallocation on next call to read_token_word */
- token = 0;
- token_buffer_size = 0;
-
- return (ps);
-}
-
-void
-restore_parser_state (ps)
- sh_parser_state_t *ps;
-{
- if (ps == 0)
- return;
-
- parser_state = ps->parser_state;
- if (ps->token_state)
- {
- restore_token_state (ps->token_state);
- free (ps->token_state);
- }
-
- shell_input_line_terminator = ps->input_line_terminator;
- eof_encountered = ps->eof_encountered;
-
- prompt_string_pointer = ps->prompt_string_pointer;
-
- current_command_line_count = ps->current_command_line_count;
-
-#if defined (HISTORY)
- remember_on_history = ps->remember_on_history;
-# if defined (BANG_HISTORY)
- history_expansion_inhibited = ps->history_expansion_inhibited;
-# endif
-#endif
-
- last_command_exit_value = ps->last_command_exit_value;
-#if defined (ARRAY_VARS)
- restore_pipestatus_array (ps->pipestatus);
-#endif
-
- last_shell_builtin = ps->last_shell_builtin;
- this_shell_builtin = ps->this_shell_builtin;
-
- expand_aliases = ps->expand_aliases;
- echo_input_at_read = ps->echo_input_at_read;
- need_here_doc = ps->need_here_doc;
-
- FREE (token);
- token = ps->token;
- token_buffer_size = ps->token_buffer_size;
-}
-
-sh_input_line_state_t *
-save_input_line_state (ls)
- sh_input_line_state_t *ls;
-{
- if (ls == 0)
- ls = (sh_input_line_state_t *)xmalloc (sizeof (sh_input_line_state_t));
- if (ls == 0)
- return ((sh_input_line_state_t *)NULL);
-
- ls->input_line = shell_input_line;
- ls->input_line_size = shell_input_line_size;
- ls->input_line_len = shell_input_line_len;
- ls->input_line_index = shell_input_line_index;
-
- /* force reallocation */
- shell_input_line = 0;
- shell_input_line_size = shell_input_line_len = shell_input_line_index = 0;
-
- return ls;
-}
-
-void
-restore_input_line_state (ls)
- sh_input_line_state_t *ls;
-{
- FREE (shell_input_line);
- shell_input_line = ls->input_line;
- shell_input_line_size = ls->input_line_size;
- shell_input_line_len = ls->input_line_len;
- shell_input_line_index = ls->input_line_index;
-
- set_line_mbstate ();
-}
-
-/************************************************
- * *
- * MULTIBYTE CHARACTER HANDLING *
- * *
- ************************************************/
-
-#if defined (HANDLE_MULTIBYTE)
-static void
-set_line_mbstate ()
-{
- int c;
- size_t i, previ, len;
- mbstate_t mbs, prevs;
- size_t mbclen;
-
- if (shell_input_line == NULL)
- return;
- len = strlen (shell_input_line); /* XXX - shell_input_line_len ? */
- FREE (shell_input_line_property);
- shell_input_line_property = (char *)xmalloc (len + 1);
-
- memset (&prevs, '\0', sizeof (mbstate_t));
- for (i = previ = 0; i < len; i++)
- {
- mbs = prevs;
-
- c = shell_input_line[i];
- if (c == EOF)
- {
- size_t j;
- for (j = i; j < len; j++)
- shell_input_line_property[j] = 1;
- break;
- }
-
- mbclen = mbrlen (shell_input_line + previ, i - previ + 1, &mbs);
- if (mbclen == 1 || mbclen == (size_t)-1)
- {
- mbclen = 1;
- previ = i + 1;
- }
- else if (mbclen == (size_t)-2)
- mbclen = 0;
- else if (mbclen > 1)
- {
- mbclen = 0;
- previ = i + 1;
- prevs = mbs;
- }
- else
- {
- /* XXX - what to do if mbrlen returns 0? (null wide character) */
- size_t j;
- for (j = i; j < len; j++)
- shell_input_line_property[j] = 1;
- break;
- }
-
- shell_input_line_property[i] = mbclen;
- }
-}
-#endif /* HANDLE_MULTIBYTE */
+++ /dev/null
-/* subst.h -- Names of externally visible functions in subst.c. */
-
-/* Copyright (C) 1993-2010 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#if !defined (_SUBST_H_)
-#define _SUBST_H_
-
-#include "stdc.h"
-
-/* Constants which specify how to handle backslashes and quoting in
- expand_word_internal (). Q_DOUBLE_QUOTES means to use the function
- slashify_in_quotes () to decide whether the backslash should be
- retained. Q_HERE_DOCUMENT means slashify_in_here_document () to
- decide whether to retain the backslash. Q_KEEP_BACKSLASH means
- to unconditionally retain the backslash. Q_PATQUOTE means that we're
- expanding a pattern ${var%#[#%]pattern} in an expansion surrounded
- by double quotes. Q_DOLBRACE means we are expanding a ${...} word, so
- backslashes should also escape { and } and be removed. */
-#define Q_DOUBLE_QUOTES 0x01
-#define Q_HERE_DOCUMENT 0x02
-#define Q_KEEP_BACKSLASH 0x04
-#define Q_PATQUOTE 0x08
-#define Q_QUOTED 0x10
-#define Q_ADDEDQUOTES 0x20
-#define Q_QUOTEDNULL 0x40
-#define Q_DOLBRACE 0x80
-
-/* Flag values controlling how assignment statements are treated. */
-#define ASS_APPEND 0x0001
-#define ASS_MKLOCAL 0x0002
-#define ASS_MKASSOC 0x0004
-#define ASS_MKGLOBAL 0x0008 /* force global assignment */
-#define ASS_NAMEREF 0x0010 /* assigning to nameref variable */
-
-/* Flags for the string extraction functions. */
-#define SX_NOALLOC 0x0001 /* just skip; don't return substring */
-#define SX_VARNAME 0x0002 /* variable name; for string_extract () */
-#define SX_REQMATCH 0x0004 /* closing/matching delimiter required */
-#define SX_COMMAND 0x0008 /* extracting a shell script/command */
-#define SX_NOCTLESC 0x0010 /* don't honor CTLESC quoting */
-#define SX_NOESCCTLNUL 0x0020 /* don't let CTLESC quote CTLNUL */
-#define SX_NOLONGJMP 0x0040 /* don't longjmp on fatal error */
-#define SX_ARITHSUB 0x0080 /* extracting $(( ... )) (currently unused) */
-#define SX_POSIXEXP 0x0100 /* extracting new Posix pattern removal expansions in extract_dollar_brace_string */
-#define SX_WORD 0x0200 /* extracting word in ${param op word} */
-
-/* Remove backslashes which are quoting backquotes from STRING. Modifies
- STRING, and returns a pointer to it. */
-extern char * de_backslash __P((char *));
-
-/* Replace instances of \! in a string with !. */
-extern void unquote_bang __P((char *));
-
-/* Extract the $( construct in STRING, and return a new string.
- Start extracting at (SINDEX) as if we had just seen "$(".
- Make (SINDEX) get the position just after the matching ")".
- XFLAGS is additional flags to pass to other extraction functions, */
-extern char *extract_command_subst __P((char *, int *, int));
-
-/* Extract the $[ construct in STRING, and return a new string.
- Start extracting at (SINDEX) as if we had just seen "$[".
- Make (SINDEX) get the position just after the matching "]". */
-extern char *extract_arithmetic_subst __P((char *, int *));
-
-#if defined (PROCESS_SUBSTITUTION)
-/* Extract the <( or >( construct in STRING, and return a new string.
- Start extracting at (SINDEX) as if we had just seen "<(".
- Make (SINDEX) get the position just after the matching ")". */
-extern char *extract_process_subst __P((char *, char *, int *, int));
-#endif /* PROCESS_SUBSTITUTION */
-
-/* Extract the name of the variable to bind to from the assignment string. */
-extern char *assignment_name __P((char *));
-
-/* Return a single string of all the words present in LIST, separating
- each word with SEP. */
-extern char *string_list_internal __P((WORD_LIST *, char *));
-
-/* Return a single string of all the words present in LIST, separating
- each word with a space. */
-extern char *string_list __P((WORD_LIST *));
-
-/* Turn $* into a single string, obeying POSIX rules. */
-extern char *string_list_dollar_star __P((WORD_LIST *));
-
-/* Expand $@ into a single string, obeying POSIX rules. */
-extern char *string_list_dollar_at __P((WORD_LIST *, int));
-
-/* Turn the positional paramters into a string, understanding quoting and
- the various subtleties of using the first character of $IFS as the
- separator. Calls string_list_dollar_at, string_list_dollar_star, and
- string_list as appropriate. */
-extern char *string_list_pos_params __P((int, WORD_LIST *, int));
-
-/* Perform quoted null character removal on each element of LIST.
- This modifies LIST. */
-extern void word_list_remove_quoted_nulls __P((WORD_LIST *));
-
-/* This performs word splitting and quoted null character removal on
- STRING. */
-extern WORD_LIST *list_string __P((char *, char *, int));
-
-extern char *ifs_firstchar __P((int *));
-extern char *get_word_from_string __P((char **, char *, char **));
-extern char *strip_trailing_ifs_whitespace __P((char *, char *, int));
-
-/* Given STRING, an assignment string, get the value of the right side
- of the `=', and bind it to the left side. If EXPAND is true, then
- perform tilde expansion, parameter expansion, command substitution,
- and arithmetic expansion on the right-hand side. Do not perform word
- splitting on the result of expansion. */
-extern int do_assignment __P((char *));
-extern int do_assignment_no_expand __P((char *));
-extern int do_word_assignment __P((WORD_DESC *, int));
-
-/* Append SOURCE to TARGET at INDEX. SIZE is the current amount
- of space allocated to TARGET. SOURCE can be NULL, in which
- case nothing happens. Gets rid of SOURCE by free ()ing it.
- Returns TARGET in case the location has changed. */
-extern char *sub_append_string __P((char *, char *, int *, int *));
-
-/* Append the textual representation of NUMBER to TARGET.
- INDEX and SIZE are as in SUB_APPEND_STRING. */
-extern char *sub_append_number __P((intmax_t, char *, int *, int *));
-
-/* Return the word list that corresponds to `$*'. */
-extern WORD_LIST *list_rest_of_args __P((void));
-
-/* Make a single large string out of the dollar digit variables,
- and the rest_of_args. If DOLLAR_STAR is 1, then obey the special
- case of "$*" with respect to IFS. */
-extern char *string_rest_of_args __P((int));
-
-extern int number_of_args __P((void));
-
-/* Expand STRING by performing parameter expansion, command substitution,
- and arithmetic expansion. Dequote the resulting WORD_LIST before
- returning it, but do not perform word splitting. The call to
- remove_quoted_nulls () is made here because word splitting normally
- takes care of quote removal. */
-extern WORD_LIST *expand_string_unsplit __P((char *, int));
-
-/* Expand the rhs of an assignment statement. */
-extern WORD_LIST *expand_string_assignment __P((char *, int));
-
-/* Expand a prompt string. */
-extern WORD_LIST *expand_prompt_string __P((char *, int, int));
-
-/* Expand STRING just as if you were expanding a word. This also returns
- a list of words. Note that filename globbing is *NOT* done for word
- or string expansion, just when the shell is expanding a command. This
- does parameter expansion, command substitution, arithmetic expansion,
- and word splitting. Dequote the resultant WORD_LIST before returning. */
-extern WORD_LIST *expand_string __P((char *, int));
-
-/* Convenience functions that expand strings to strings, taking care of
- converting the WORD_LIST * returned by the expand_string* functions
- to a string and deallocating the WORD_LIST *. */
-extern char *expand_string_to_string __P((char *, int));
-extern char *expand_string_unsplit_to_string __P((char *, int));
-extern char *expand_assignment_string_to_string __P((char *, int));
-
-/* Expand an arithmetic expression string */
-extern char *expand_arith_string __P((char *, int));
-
-/* De-quote quoted characters in STRING. */
-extern char *dequote_string __P((char *));
-
-/* De-quote CTLESC-escaped CTLESC or CTLNUL characters in STRING. */
-extern char *dequote_escapes __P((char *));
-
-/* De-quote quoted characters in each word in LIST. */
-extern WORD_LIST *dequote_list __P((WORD_LIST *));
-
-/* Expand WORD, performing word splitting on the result. This does
- parameter expansion, command substitution, arithmetic expansion,
- word splitting, and quote removal. */
-extern WORD_LIST *expand_word __P((WORD_DESC *, int));
-
-/* Expand WORD, but do not perform word splitting on the result. This
- does parameter expansion, command substitution, arithmetic expansion,
- and quote removal. */
-extern WORD_LIST *expand_word_unsplit __P((WORD_DESC *, int));
-extern WORD_LIST *expand_word_leave_quoted __P((WORD_DESC *, int));
-
-/* Return the value of a positional parameter. This handles values > 10. */
-extern char *get_dollar_var_value __P((intmax_t));
-
-/* Quote a string to protect it from word splitting. */
-extern char *quote_string __P((char *));
-
-/* Quote escape characters (characters special to interals of expansion)
- in a string. */
-extern char *quote_escapes __P((char *));
-
-/* And remove such quoted special characters. */
-extern char *remove_quoted_escapes __P((char *));
-
-/* Remove CTLNUL characters from STRING unless they are quoted with CTLESC. */
-extern char *remove_quoted_nulls __P((char *));
-
-/* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the
- backslash quoting rules for within double quotes. */
-extern char *string_quote_removal __P((char *, int));
-
-/* Perform quote removal on word WORD. This allocates and returns a new
- WORD_DESC *. */
-extern WORD_DESC *word_quote_removal __P((WORD_DESC *, int));
-
-/* Perform quote removal on all words in LIST. If QUOTED is non-zero,
- the members of the list are treated as if they are surrounded by
- double quotes. Return a new list, or NULL if LIST is NULL. */
-extern WORD_LIST *word_list_quote_removal __P((WORD_LIST *, int));
-
-/* Called when IFS is changed to maintain some private variables. */
-extern void setifs __P((SHELL_VAR *));
-
-/* Return the value of $IFS, or " \t\n" if IFS is unset. */
-extern char *getifs __P((void));
-
-/* This splits a single word into a WORD LIST on $IFS, but only if the word
- is not quoted. list_string () performs quote removal for us, even if we
- don't do any splitting. */
-extern WORD_LIST *word_split __P((WORD_DESC *, char *));
-
-/* Take the list of words in LIST and do the various substitutions. Return
- a new list of words which is the expanded list, and without things like
- variable assignments. */
-extern WORD_LIST *expand_words __P((WORD_LIST *));
-
-/* Same as expand_words (), but doesn't hack variable or environment
- variables. */
-extern WORD_LIST *expand_words_no_vars __P((WORD_LIST *));
-
-/* Perform the `normal shell expansions' on a WORD_LIST. These are
- brace expansion, tilde expansion, parameter and variable substitution,
- command substitution, arithmetic expansion, and word splitting. */
-extern WORD_LIST *expand_words_shellexp __P((WORD_LIST *));
-
-extern WORD_DESC *command_substitute __P((char *, int));
-extern char *pat_subst __P((char *, char *, char *, int));
-
-extern int fifos_pending __P((void));
-extern int num_fifos __P((void));
-extern void unlink_fifo_list __P((void));
-extern void unlink_fifo __P((int));
-
-extern char *copy_fifo_list __P((int *));
-extern void unlink_new_fifos __P((char *, int));
-extern void close_new_fifos __P((char *, int));
-
-extern void clear_fifo_list __P((void));
-
-extern WORD_LIST *list_string_with_quotes __P((char *));
-
-#if defined (ARRAY_VARS)
-extern char *extract_array_assignment_list __P((char *, int *));
-#endif
-
-#if defined (COND_COMMAND)
-extern char *remove_backslashes __P((char *));
-extern char *cond_expand_word __P((WORD_DESC *, int));
-#endif
-
-/* Flags for skip_to_delim */
-#define SD_NOJMP 0x01 /* don't longjmp on fatal error. */
-#define SD_INVERT 0x02 /* look for chars NOT in passed set */
-#define SD_NOQUOTEDELIM 0x04 /* don't let single or double quotes act as delimiters */
-#define SD_NOSKIPCMD 0x08 /* don't skip over $(, <(, or >( command/process substitution; parse them as commands */
-#define SD_EXTGLOB 0x10 /* skip over extended globbing patterns if appropriate */
-#define SD_IGNOREQUOTE 0x20 /* single and double quotes are not special */
-#define SD_GLOB 0x40 /* skip over glob patterns like bracket expressions */
-#define SD_NOPROCSUB 0x80 /* don't parse process substitutions as commands */
-
-extern int skip_to_delim __P((char *, int, char *, int));
-
-#if defined (READLINE)
-extern int char_is_quoted __P((char *, int));
-extern int unclosed_pair __P((char *, int, char *));
-extern WORD_LIST *split_at_delims __P((char *, int, char *, int, int, int *, int *));
-#endif
-
-/* Variables used to keep track of the characters in IFS. */
-extern SHELL_VAR *ifs_var;
-extern char *ifs_value;
-extern unsigned char ifs_cmap[];
-
-#if defined (HANDLE_MULTIBYTE)
-extern unsigned char ifs_firstc[];
-extern size_t ifs_firstc_len;
-#else
-extern unsigned char ifs_firstc;
-#endif
-
-/* Evaluates to 1 if C is a character in $IFS. */
-#define isifs(c) (ifs_cmap[(unsigned char)(c)] != 0)
-
-/* How to determine the quoted state of the character C. */
-#define QUOTED_CHAR(c) ((c) == CTLESC)
-
-/* Is the first character of STRING a quoted NULL character? */
-#define QUOTED_NULL(string) ((string)[0] == CTLNUL && (string)[1] == '\0')
-
-#endif /* !_SUBST_H_ */
+++ /dev/null
-BUILD_DIR=/usr/local/build/chet/bash/bash-current
-THIS_SH=$BUILD_DIR/bash
-PATH=$PATH:$BUILD_DIR
-
-export THIS_SH PATH
-
-rm -f /tmp/xx
-
-/bin/sh "$@"
+++ /dev/null
-/* variables.c -- Functions for hacking shell variables. */
-
-/* Copyright (C) 1987-2013 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- Bash is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Bash is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Bash. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "config.h"
-
-#include "bashtypes.h"
-#include "posixstat.h"
-#include "posixtime.h"
-
-#if defined (__QNX__)
-# if defined (__QNXNTO__)
-# include <sys/netmgr.h>
-# else
-# include <sys/vc.h>
-# endif /* !__QNXNTO__ */
-#endif /* __QNX__ */
-
-#if defined (HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-
-#include <stdio.h>
-#include "chartypes.h"
-#if defined (HAVE_PWD_H)
-# include <pwd.h>
-#endif
-#include "bashansi.h"
-#include "bashintl.h"
-
-#define NEED_XTRACE_SET_DECL
-
-#include "shell.h"
-#include "flags.h"
-#include "execute_cmd.h"
-#include "findcmd.h"
-#include "mailcheck.h"
-#include "input.h"
-#include "hashcmd.h"
-#include "pathexp.h"
-#include "alias.h"
-#include "jobs.h"
-
-#include "version.h"
-
-#include "builtins/getopt.h"
-#include "builtins/common.h"
-#include "builtins/builtext.h"
-
-#if defined (READLINE)
-# include "bashline.h"
-# include <readline/readline.h>
-#else
-# include <tilde/tilde.h>
-#endif
-
-#if defined (HISTORY)
-# include "bashhist.h"
-# include <readline/history.h>
-#endif /* HISTORY */
-
-#if defined (PROGRAMMABLE_COMPLETION)
-# include "pcomplete.h"
-#endif
-
-#define TEMPENV_HASH_BUCKETS 4 /* must be power of two */
-
-#define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
-
-/* flags for find_variable_internal */
-
-#define FV_FORCETEMPENV 0x01
-#define FV_SKIPINVISIBLE 0x02
-
-extern char **environ;
-
-/* Variables used here and defined in other files. */
-extern int posixly_correct;
-extern int line_number, line_number_base;
-extern int subshell_environment, indirection_level, subshell_level;
-extern int build_version, patch_level;
-extern int expanding_redir;
-extern int last_command_exit_value;
-extern char *dist_version, *release_status;
-extern char *shell_name;
-extern char *primary_prompt, *secondary_prompt;
-extern char *current_host_name;
-extern sh_builtin_func_t *this_shell_builtin;
-extern SHELL_VAR *this_shell_function;
-extern char *the_printed_command_except_trap;
-extern char *this_command_name;
-extern char *command_execution_string;
-extern time_t shell_start_time;
-extern int assigning_in_environment;
-extern int executing_builtin;
-extern int funcnest_max;
-
-#if defined (READLINE)
-extern int no_line_editing;
-extern int perform_hostname_completion;
-#endif
-
-/* The list of shell variables that the user has created at the global
- scope, or that came from the environment. */
-VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL;
-
-/* The current list of shell variables, including function scopes */
-VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL;
-
-/* The list of shell functions that the user has created, or that came from
- the environment. */
-HASH_TABLE *shell_functions = (HASH_TABLE *)NULL;
-
-#if defined (DEBUGGER)
-/* The table of shell function definitions that the user defined or that
- came from the environment. */
-HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL;
-#endif
-
-/* The current variable context. This is really a count of how deep into
- executing functions we are. */
-int variable_context = 0;
-
-/* The set of shell assignments which are made only in the environment
- for a single command. */
-HASH_TABLE *temporary_env = (HASH_TABLE *)NULL;
-
-/* Set to non-zero if an assignment error occurs while putting variables
- into the temporary environment. */
-int tempenv_assign_error;
-
-/* Some funky variables which are known about specially. Here is where
- "$*", "$1", and all the cruft is kept. */
-char *dollar_vars[10];
-WORD_LIST *rest_of_args = (WORD_LIST *)NULL;
-
-/* The value of $$. */
-pid_t dollar_dollar_pid;
-
-/* Non-zero means that we have to remake EXPORT_ENV. */
-int array_needs_making = 1;
-
-/* The number of times BASH has been executed. This is set
- by initialize_variables (). */
-int shell_level = 0;
-
-/* An array which is passed to commands as their environment. It is
- manufactured from the union of the initial environment and the
- shell variables that are marked for export. */
-char **export_env = (char **)NULL;
-static int export_env_index;
-static int export_env_size;
-
-#if defined (READLINE)
-static int winsize_assignment; /* currently assigning to LINES or COLUMNS */
-#endif
-
-static HASH_TABLE *last_table_searched; /* hash_lookup sets this */
-
-/* Some forward declarations. */
-static void create_variable_tables __P((void));
-
-static void set_machine_vars __P((void));
-static void set_home_var __P((void));
-static void set_shell_var __P((void));
-static char *get_bash_name __P((void));
-static void initialize_shell_level __P((void));
-static void uidset __P((void));
-#if defined (ARRAY_VARS)
-static void make_vers_array __P((void));
-#endif
-
-static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
-#if defined (ARRAY_VARS)
-static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
-#endif
-static SHELL_VAR *get_self __P((SHELL_VAR *));
-
-#if defined (ARRAY_VARS)
-static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
-static SHELL_VAR *init_dynamic_assoc_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
-#endif
-
-static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t, char *));
-static SHELL_VAR *get_seconds __P((SHELL_VAR *));
-static SHELL_VAR *init_seconds_var __P((void));
-
-static int brand __P((void));
-static void sbrand __P((unsigned long)); /* set bash random number generator. */
-static void seedrand __P((void)); /* seed generator randomly */
-static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t, char *));
-static SHELL_VAR *get_random __P((SHELL_VAR *));
-
-static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t, char *));
-static SHELL_VAR *get_lineno __P((SHELL_VAR *));
-
-static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t, char *));
-static SHELL_VAR *get_subshell __P((SHELL_VAR *));
-
-static SHELL_VAR *get_bashpid __P((SHELL_VAR *));
-
-#if defined (HISTORY)
-static SHELL_VAR *get_histcmd __P((SHELL_VAR *));
-#endif
-
-#if defined (READLINE)
-static SHELL_VAR *get_comp_wordbreaks __P((SHELL_VAR *));
-static SHELL_VAR *assign_comp_wordbreaks __P((SHELL_VAR *, char *, arrayind_t, char *));
-#endif
-
-#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
-static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t, char *));
-static SHELL_VAR *get_dirstack __P((SHELL_VAR *));
-#endif
-
-#if defined (ARRAY_VARS)
-static SHELL_VAR *get_groupset __P((SHELL_VAR *));
-
-static SHELL_VAR *build_hashcmd __P((SHELL_VAR *));
-static SHELL_VAR *get_hashcmd __P((SHELL_VAR *));
-static SHELL_VAR *assign_hashcmd __P((SHELL_VAR *, char *, arrayind_t, char *));
-# if defined (ALIAS)
-static SHELL_VAR *build_aliasvar __P((SHELL_VAR *));
-static SHELL_VAR *get_aliasvar __P((SHELL_VAR *));
-static SHELL_VAR *assign_aliasvar __P((SHELL_VAR *, char *, arrayind_t, char *));
-# endif
-#endif
-
-static SHELL_VAR *get_funcname __P((SHELL_VAR *));
-static SHELL_VAR *init_funcname_var __P((void));
-
-static void initialize_dynamic_variables __P((void));
-
-static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *));
-static SHELL_VAR *new_shell_variable __P((const char *));
-static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *));
-static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int));
-
-static void dispose_variable_value __P((SHELL_VAR *));
-static void free_variable_hash_data __P((PTR_T));
-
-static VARLIST *vlist_alloc __P((int));
-static VARLIST *vlist_realloc __P((VARLIST *, int));
-static void vlist_add __P((VARLIST *, SHELL_VAR *, int));
-
-static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
-
-static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **));
-
-static SHELL_VAR **vapply __P((sh_var_map_func_t *));
-static SHELL_VAR **fapply __P((sh_var_map_func_t *));
-
-static int visible_var __P((SHELL_VAR *));
-static int visible_and_exported __P((SHELL_VAR *));
-static int export_environment_candidate __P((SHELL_VAR *));
-static int local_and_exported __P((SHELL_VAR *));
-static int variable_in_context __P((SHELL_VAR *));
-#if defined (ARRAY_VARS)
-static int visible_array_vars __P((SHELL_VAR *));
-#endif
-
-static SHELL_VAR *find_nameref_at_context __P((SHELL_VAR *, VAR_CONTEXT *));
-static SHELL_VAR *find_variable_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
-static SHELL_VAR *find_variable_last_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
-
-static SHELL_VAR *bind_tempenv_variable __P((const char *, char *));
-static void push_temp_var __P((PTR_T));
-static void propagate_temp_var __P((PTR_T));
-static void dispose_temporary_env __P((sh_free_func_t *));
-
-static inline char *mk_env_string __P((const char *, const char *));
-static char **make_env_array_from_var_list __P((SHELL_VAR **));
-static char **make_var_export_array __P((VAR_CONTEXT *));
-static char **make_func_export_array __P((void));
-static void add_temp_array_to_env __P((char **, int, int));
-
-static int n_shell_variables __P((void));
-static int set_context __P((SHELL_VAR *));
-
-static void push_func_var __P((PTR_T));
-static void push_exported_var __P((PTR_T));
-
-static inline int find_special_var __P((const char *));
-
-static void
-create_variable_tables ()
-{
- if (shell_variables == 0)
- {
- shell_variables = global_variables = new_var_context ((char *)NULL, 0);
- shell_variables->scope = 0;
- shell_variables->table = hash_create (0);
- }
-
- if (shell_functions == 0)
- shell_functions = hash_create (0);
-
-#if defined (DEBUGGER)
- if (shell_function_defs == 0)
- shell_function_defs = hash_create (0);
-#endif
-}
-
-/* Initialize the shell variables from the current environment.
- If PRIVMODE is nonzero, don't import functions from ENV or
- parse $SHELLOPTS. */
-void
-initialize_shell_variables (env, privmode)
- char **env;
- int privmode;
-{
- char *name, *string, *temp_string;
- int c, char_index, string_index, string_length, ro;
- SHELL_VAR *temp_var;
-
- create_variable_tables ();
-
- for (string_index = 0; string = env[string_index++]; )
- {
- char_index = 0;
- name = string;
- while ((c = *string++) && c != '=')
- ;
- if (string[-1] == '=')
- char_index = string - name - 1;
-
- /* If there are weird things in the environment, like `=xxx' or a
- string without an `=', just skip them. */
- if (char_index == 0)
- continue;
-
- /* ASSERT(name[char_index] == '=') */
- name[char_index] = '\0';
- /* Now, name = env variable name, string = env variable value, and
- char_index == strlen (name) */
-
- temp_var = (SHELL_VAR *)NULL;
-
- /* If exported function, define it now. Don't import functions from
- the environment in privileged mode. */
- if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4))
- {
- string_length = strlen (string);
- temp_string = (char *)xmalloc (3 + string_length + char_index);
-
- strcpy (temp_string, name);
- temp_string[char_index] = ' ';
- strcpy (temp_string + char_index + 1, string);
-
- /* Don't import function names that are invalid identifiers from the
- environment, though we still allow them to be defined. */
- if (legal_identifier (name))
- parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
-
- if (temp_var = find_function (name))
- {
- VSETATTR (temp_var, (att_exported|att_imported));
- array_needs_making = 1;
- }
- else
- {
- if (temp_var = bind_variable (name, string, 0))
- {
- VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
- array_needs_making = 1;
- }
- last_command_exit_value = 1;
- report_error (_("error importing function definition for `%s'"), name);
- }
- }
-#if defined (ARRAY_VARS)
-# if ARRAY_EXPORT
- /* Array variables may not yet be exported. */
- else if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')')
- {
- string_length = 1;
- temp_string = extract_array_assignment_list (string, &string_length);
- temp_var = assign_array_from_string (name, temp_string);
- FREE (temp_string);
- VSETATTR (temp_var, (att_exported | att_imported));
- array_needs_making = 1;
- }
-# endif /* ARRAY_EXPORT */
-#endif
-#if 0
- else if (legal_identifier (name))
-#else
- else
-#endif
- {
- ro = 0;
- if (posixly_correct && STREQ (name, "SHELLOPTS"))
- {
- temp_var = find_variable ("SHELLOPTS");
- ro = temp_var && readonly_p (temp_var);
- if (temp_var)
- VUNSETATTR (temp_var, att_readonly);
- }
- temp_var = bind_variable (name, string, 0);
- if (temp_var)
- {
- if (legal_identifier (name))
- VSETATTR (temp_var, (att_exported | att_imported));
- else
- VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
- if (ro)
- VSETATTR (temp_var, att_readonly);
- array_needs_making = 1;
- }
- }
-
- name[char_index] = '=';
- /* temp_var can be NULL if it was an exported function with a syntax
- error (a different bug, but it still shouldn't dump core). */
- if (temp_var && function_p (temp_var) == 0) /* XXX not yet */
- {
- CACHE_IMPORTSTR (temp_var, name);
- }
- }
-
- set_pwd ();
-
- /* Set up initial value of $_ */
- temp_var = set_if_not ("_", dollar_vars[0]);
-
- /* Remember this pid. */
- dollar_dollar_pid = getpid ();
-
- /* Now make our own defaults in case the vars that we think are
- important are missing. */
- temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);
-#if 0
- set_auto_export (temp_var); /* XXX */
-#endif
-
- temp_var = set_if_not ("TERM", "dumb");
-#if 0
- set_auto_export (temp_var); /* XXX */
-#endif
-
-#if defined (__QNX__)
- /* set node id -- don't import it from the environment */
- {
- char node_name[22];
-# if defined (__QNXNTO__)
- netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name));
-# else
- qnx_nidtostr (getnid (), node_name, sizeof (node_name));
-# endif
- temp_var = bind_variable ("NODE", node_name, 0);
- set_auto_export (temp_var);
- }
-#endif
-
- /* set up the prompts. */
- if (interactive_shell)
- {
-#if defined (PROMPT_STRING_DECODE)
- set_if_not ("PS1", primary_prompt);
-#else
- if (current_user.uid == -1)
- get_current_user_info ();
- set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt);
-#endif
- set_if_not ("PS2", secondary_prompt);
- }
- set_if_not ("PS4", "+ ");
-
- /* Don't allow IFS to be imported from the environment. */
- temp_var = bind_variable ("IFS", " \t\n", 0);
- setifs (temp_var);
-
- /* Magic machine types. Pretty convenient. */
- set_machine_vars ();
-
- /* Default MAILCHECK for interactive shells. Defer the creation of a
- default MAILPATH until the startup files are read, because MAIL
- names a mail file if MAILPATH is not set, and we should provide a
- default only if neither is set. */
- if (interactive_shell)
- {
- temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60");
- VSETATTR (temp_var, att_integer);
- }
-
- /* Do some things with shell level. */
- initialize_shell_level ();
-
- set_ppid ();
-
- /* Initialize the `getopts' stuff. */
- temp_var = bind_variable ("OPTIND", "1", 0);
- VSETATTR (temp_var, att_integer);
- getopts_reset (0);
- bind_variable ("OPTERR", "1", 0);
- sh_opterr = 1;
-
- if (login_shell == 1 && posixly_correct == 0)
- set_home_var ();
-
- /* Get the full pathname to THIS shell, and set the BASH variable
- to it. */
- name = get_bash_name ();
- temp_var = bind_variable ("BASH", name, 0);
- free (name);
-
- /* Make the exported environment variable SHELL be the user's login
- shell. Note that the `tset' command looks at this variable
- to determine what style of commands to output; if it ends in "csh",
- then C-shell commands are output, else Bourne shell commands. */
- set_shell_var ();
-
- /* Make a variable called BASH_VERSION which contains the version info. */
- bind_variable ("BASH_VERSION", shell_version_string (), 0);
-#if defined (ARRAY_VARS)
- make_vers_array ();
-#endif
-
- if (command_execution_string)
- bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0);
-
- /* Find out if we're supposed to be in Posix.2 mode via an
- environment variable. */
- temp_var = find_variable ("POSIXLY_CORRECT");
- if (!temp_var)
- temp_var = find_variable ("POSIX_PEDANTIC");
- if (temp_var && imported_p (temp_var))
- sv_strict_posix (temp_var->name);
-
-#if defined (HISTORY)
- /* Set history variables to defaults, and then do whatever we would
- do if the variable had just been set. Do this only in the case
- that we are remembering commands on the history list. */
- if (remember_on_history)
- {
- name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0);
-
- set_if_not ("HISTFILE", name);
- free (name);
- }
-#endif /* HISTORY */
-
- /* Seed the random number generator. */
- seedrand ();
-
- /* Handle some "special" variables that we may have inherited from a
- parent shell. */
- if (interactive_shell)
- {
- temp_var = find_variable ("IGNOREEOF");
- if (!temp_var)
- temp_var = find_variable ("ignoreeof");
- if (temp_var && imported_p (temp_var))
- sv_ignoreeof (temp_var->name);
- }
-
-#if defined (HISTORY)
- if (interactive_shell && remember_on_history)
- {
- sv_history_control ("HISTCONTROL");
- sv_histignore ("HISTIGNORE");
- sv_histtimefmt ("HISTTIMEFORMAT");
- }
-#endif /* HISTORY */
-
-#if defined (READLINE) && defined (STRICT_POSIX)
- /* POSIXLY_CORRECT will only be 1 here if the shell was compiled
- -DSTRICT_POSIX */
- if (interactive_shell && posixly_correct && no_line_editing == 0)
- rl_prefer_env_winsize = 1;
-#endif /* READLINE && STRICT_POSIX */
-
- /*
- * 24 October 2001
- *
- * I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT
- * and SSH2_CLIENT alone. I'm going to rely on the shell_level check in
- * isnetconn() to avoid running the startup files more often than wanted.
- * That will, of course, only work if the user's login shell is bash, so
- * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined
- * in config-top.h.
- */
-#if 0
- temp_var = find_variable ("SSH_CLIENT");
- if (temp_var && imported_p (temp_var))
- {
- VUNSETATTR (temp_var, att_exported);
- array_needs_making = 1;
- }
- temp_var = find_variable ("SSH2_CLIENT");
- if (temp_var && imported_p (temp_var))
- {
- VUNSETATTR (temp_var, att_exported);
- array_needs_making = 1;
- }
-#endif
-
- /* Get the user's real and effective user ids. */
- uidset ();
-
- temp_var = find_variable ("BASH_XTRACEFD");
- if (temp_var && imported_p (temp_var))
- sv_xtracefd (temp_var->name);
-
- /* Initialize the dynamic variables, and seed their values. */
- initialize_dynamic_variables ();
-}
-
-/* **************************************************************** */
-/* */
-/* Setting values for special shell variables */
-/* */
-/* **************************************************************** */
-
-static void
-set_machine_vars ()
-{
- SHELL_VAR *temp_var;
-
- temp_var = set_if_not ("HOSTTYPE", HOSTTYPE);
- temp_var = set_if_not ("OSTYPE", OSTYPE);
- temp_var = set_if_not ("MACHTYPE", MACHTYPE);
-
- temp_var = set_if_not ("HOSTNAME", current_host_name);
-}
-
-/* Set $HOME to the information in the password file if we didn't get
- it from the environment. */
-
-/* This function is not static so the tilde and readline libraries can
- use it. */
-char *
-sh_get_home_dir ()
-{
- if (current_user.home_dir == 0)
- get_current_user_info ();
- return current_user.home_dir;
-}
-
-static void
-set_home_var ()
-{
- SHELL_VAR *temp_var;
-
- temp_var = find_variable ("HOME");
- if (temp_var == 0)
- temp_var = bind_variable ("HOME", sh_get_home_dir (), 0);
-#if 0
- VSETATTR (temp_var, att_exported);
-#endif
-}
-
-/* Set $SHELL to the user's login shell if it is not already set. Call
- get_current_user_info if we haven't already fetched the shell. */
-static void
-set_shell_var ()
-{
- SHELL_VAR *temp_var;
-
- temp_var = find_variable ("SHELL");
- if (temp_var == 0)
- {
- if (current_user.shell == 0)
- get_current_user_info ();
- temp_var = bind_variable ("SHELL", current_user.shell, 0);
- }
-#if 0
- VSETATTR (temp_var, att_exported);
-#endif
-}
-
-static char *
-get_bash_name ()
-{
- char *name;
-
- if ((login_shell == 1) && RELPATH(shell_name))
- {
- if (current_user.shell == 0)
- get_current_user_info ();
- name = savestring (current_user.shell);
- }
- else if (ABSPATH(shell_name))
- name = savestring (shell_name);
- else if (shell_name[0] == '.' && shell_name[1] == '/')
- {
- /* Fast path for common case. */
- char *cdir;
- int len;
-
- cdir = get_string_value ("PWD");
- if (cdir)
- {
- len = strlen (cdir);
- name = (char *)xmalloc (len + strlen (shell_name) + 1);
- strcpy (name, cdir);
- strcpy (name + len, shell_name + 1);
- }
- else
- name = savestring (shell_name);
- }
- else
- {
- char *tname;
- int s;
-
- tname = find_user_command (shell_name);
-
- if (tname == 0)
- {
- /* Try the current directory. If there is not an executable
- there, just punt and use the login shell. */
- s = file_status (shell_name);
- if (s & FS_EXECABLE)
- {
- tname = make_absolute (shell_name, get_string_value ("PWD"));
- if (*shell_name == '.')
- {
- name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
- if (name == 0)
- name = tname;
- else
- free (tname);
- }
- else
- name = tname;
- }
- else
- {
- if (current_user.shell == 0)
- get_current_user_info ();
- name = savestring (current_user.shell);
- }
- }
- else
- {
- name = full_pathname (tname);
- free (tname);
- }
- }
-
- return (name);
-}
-
-void
-adjust_shell_level (change)
- int change;
-{
- char new_level[5], *old_SHLVL;
- intmax_t old_level;
- SHELL_VAR *temp_var;
-
- old_SHLVL = get_string_value ("SHLVL");
- if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0)
- old_level = 0;
-
- shell_level = old_level + change;
- if (shell_level < 0)
- shell_level = 0;
- else if (shell_level > 1000)
- {
- internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level);
- shell_level = 1;
- }
-
- /* We don't need the full generality of itos here. */
- if (shell_level < 10)
- {
- new_level[0] = shell_level + '0';
- new_level[1] = '\0';
- }
- else if (shell_level < 100)
- {
- new_level[0] = (shell_level / 10) + '0';
- new_level[1] = (shell_level % 10) + '0';
- new_level[2] = '\0';
- }
- else if (shell_level < 1000)
- {
- new_level[0] = (shell_level / 100) + '0';
- old_level = shell_level % 100;
- new_level[1] = (old_level / 10) + '0';
- new_level[2] = (old_level % 10) + '0';
- new_level[3] = '\0';
- }
-
- temp_var = bind_variable ("SHLVL", new_level, 0);
- set_auto_export (temp_var);
-}
-
-static void
-initialize_shell_level ()
-{
- adjust_shell_level (1);
-}
-
-/* If we got PWD from the environment, update our idea of the current
- working directory. In any case, make sure that PWD exists before
- checking it. It is possible for getcwd () to fail on shell startup,
- and in that case, PWD would be undefined. If this is an interactive
- login shell, see if $HOME is the current working directory, and if
- that's not the same string as $PWD, set PWD=$HOME. */
-
-void
-set_pwd ()
-{
- SHELL_VAR *temp_var, *home_var;
- char *temp_string, *home_string;
-
- home_var = find_variable ("HOME");
- home_string = home_var ? value_cell (home_var) : (char *)NULL;
-
- temp_var = find_variable ("PWD");
- if (temp_var && imported_p (temp_var) &&
- (temp_string = value_cell (temp_var)) &&
- same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL))
- set_working_directory (temp_string);
- else if (home_string && interactive_shell && login_shell &&
- same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL))
- {
- set_working_directory (home_string);
- temp_var = bind_variable ("PWD", home_string, 0);
- set_auto_export (temp_var);
- }
- else
- {
- temp_string = get_working_directory ("shell-init");
- if (temp_string)
- {
- temp_var = bind_variable ("PWD", temp_string, 0);
- set_auto_export (temp_var);
- free (temp_string);
- }
- }
-
- /* According to the Single Unix Specification, v2, $OLDPWD is an
- `environment variable' and therefore should be auto-exported.
- Make a dummy invisible variable for OLDPWD, and mark it as exported. */
- temp_var = bind_variable ("OLDPWD", (char *)NULL, 0);
- VSETATTR (temp_var, (att_exported | att_invisible));
-}
-
-/* Make a variable $PPID, which holds the pid of the shell's parent. */
-void
-set_ppid ()
-{
- char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name;
- SHELL_VAR *temp_var;
-
- name = inttostr (getppid (), namebuf, sizeof(namebuf));
- temp_var = find_variable ("PPID");
- if (temp_var)
- VUNSETATTR (temp_var, (att_readonly | att_exported));
- temp_var = bind_variable ("PPID", name, 0);
- VSETATTR (temp_var, (att_readonly | att_integer));
-}
-
-static void
-uidset ()
-{
- char buff[INT_STRLEN_BOUND(uid_t) + 1], *b;
- register SHELL_VAR *v;
-
- b = inttostr (current_user.uid, buff, sizeof (buff));
- v = find_variable ("UID");
- if (v == 0)
- {
- v = bind_variable ("UID", b, 0);
- VSETATTR (v, (att_readonly | att_integer));
- }
-
- if (current_user.euid != current_user.uid)
- b = inttostr (current_user.euid, buff, sizeof (buff));
-
- v = find_variable ("EUID");
- if (v == 0)
- {
- v = bind_variable ("EUID", b, 0);
- VSETATTR (v, (att_readonly | att_integer));
- }
-}
-
-#if defined (ARRAY_VARS)
-static void
-make_vers_array ()
-{
- SHELL_VAR *vv;
- ARRAY *av;
- char *s, d[32], b[INT_STRLEN_BOUND(int) + 1];
-
- unbind_variable ("BASH_VERSINFO");
-
- vv = make_new_array_variable ("BASH_VERSINFO");
- av = array_cell (vv);
- strcpy (d, dist_version);
- s = strchr (d, '.');
- if (s)
- *s++ = '\0';
- array_insert (av, 0, d);
- array_insert (av, 1, s);
- s = inttostr (patch_level, b, sizeof (b));
- array_insert (av, 2, s);
- s = inttostr (build_version, b, sizeof (b));
- array_insert (av, 3, s);
- array_insert (av, 4, release_status);
- array_insert (av, 5, MACHTYPE);
-
- VSETATTR (vv, att_readonly);
-}
-#endif /* ARRAY_VARS */
-
-/* Set the environment variables $LINES and $COLUMNS in response to
- a window size change. */
-void
-sh_set_lines_and_columns (lines, cols)
- int lines, cols;
-{
- char val[INT_STRLEN_BOUND(int) + 1], *v;
-
-#if defined (READLINE)
- /* If we are currently assigning to LINES or COLUMNS, don't do anything. */
- if (winsize_assignment)
- return;
-#endif
-
- v = inttostr (lines, val, sizeof (val));
- bind_variable ("LINES", v, 0);
-
- v = inttostr (cols, val, sizeof (val));
- bind_variable ("COLUMNS", v, 0);
-}
-
-/* **************************************************************** */
-/* */
-/* Printing variables and values */
-/* */
-/* **************************************************************** */
-
-/* Print LIST (a list of shell variables) to stdout in such a way that
- they can be read back in. */
-void
-print_var_list (list)
- register SHELL_VAR **list;
-{
- register int i;
- register SHELL_VAR *var;
-
- for (i = 0; list && (var = list[i]); i++)
- if (invisible_p (var) == 0)
- print_assignment (var);
-}
-
-/* Print LIST (a list of shell functions) to stdout in such a way that
- they can be read back in. */
-void
-print_func_list (list)
- register SHELL_VAR **list;
-{
- register int i;
- register SHELL_VAR *var;
-
- for (i = 0; list && (var = list[i]); i++)
- {
- printf ("%s ", var->name);
- print_var_function (var);
- printf ("\n");
- }
-}
-
-/* Print the value of a single SHELL_VAR. No newline is
- output, but the variable is printed in such a way that
- it can be read back in. */
-void
-print_assignment (var)
- SHELL_VAR *var;
-{
- if (var_isset (var) == 0)
- return;
-
- if (function_p (var))
- {
- printf ("%s", var->name);
- print_var_function (var);
- printf ("\n");
- }
-#if defined (ARRAY_VARS)
- else if (array_p (var))
- print_array_assignment (var, 0);
- else if (assoc_p (var))
- print_assoc_assignment (var, 0);
-#endif /* ARRAY_VARS */
- else
- {
- printf ("%s=", var->name);
- print_var_value (var, 1);
- printf ("\n");
- }
-}
-
-/* Print the value cell of VAR, a shell variable. Do not print
- the name, nor leading/trailing newline. If QUOTE is non-zero,
- and the value contains shell metacharacters, quote the value
- in such a way that it can be read back in. */
-void
-print_var_value (var, quote)
- SHELL_VAR *var;
- int quote;
-{
- char *t;
-
- if (var_isset (var) == 0)
- return;
-
- if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var)))
- {
- t = ansic_quote (value_cell (var), 0, (int *)0);
- printf ("%s", t);
- free (t);
- }
- else if (quote && sh_contains_shell_metas (value_cell (var)))
- {
- t = sh_single_quote (value_cell (var));
- printf ("%s", t);
- free (t);
- }
- else
- printf ("%s", value_cell (var));
-}
-
-/* Print the function cell of VAR, a shell variable. Do not
- print the name, nor leading/trailing newline. */
-void
-print_var_function (var)
- SHELL_VAR *var;
-{
- char *x;
-
- if (function_p (var) && var_isset (var))
- {
- x = named_function_string ((char *)NULL, function_cell(var), FUNC_MULTILINE|FUNC_EXTERNAL);
- printf ("%s", x);
- }
-}
-
-/* **************************************************************** */
-/* */
-/* Dynamic Variables */
-/* */
-/* **************************************************************** */
-
-/* DYNAMIC VARIABLES
-
- These are variables whose values are generated anew each time they are
- referenced. These are implemented using a pair of function pointers
- in the struct variable: assign_func, which is called from bind_variable
- and, if arrays are compiled into the shell, some of the functions in
- arrayfunc.c, and dynamic_value, which is called from find_variable.
-
- assign_func is called from bind_variable_internal, if
- bind_variable_internal discovers that the variable being assigned to
- has such a function. The function is called as
- SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind)
- and the (SHELL_VAR *)temp is returned as the value of bind_variable. It
- is usually ENTRY (self). IND is an index for an array variable, and
- unused otherwise.
-
- dynamic_value is called from find_variable_internal to return a `new'
- value for the specified dynamic varible. If this function is NULL,
- the variable is treated as a `normal' shell variable. If it is not,
- however, then this function is called like this:
- tempvar = (*(var->dynamic_value)) (var);
-
- Sometimes `tempvar' will replace the value of `var'. Other times, the
- shell will simply use the string value. Pretty object-oriented, huh?
-
- Be warned, though: if you `unset' a special variable, it loses its
- special meaning, even if you subsequently set it.
-
- The special assignment code would probably have been better put in
- subst.c: do_assignment_internal, in the same style as
- stupidly_hack_special_variables, but I wanted the changes as
- localized as possible. */
-
-#define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \
- do \
- { \
- v = bind_variable (var, (val), 0); \
- v->dynamic_value = gfunc; \
- v->assign_func = afunc; \
- } \
- while (0)
-
-#define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \
- do \
- { \
- v = make_new_array_variable (var); \
- v->dynamic_value = gfunc; \
- v->assign_func = afunc; \
- } \
- while (0)
-
-#define INIT_DYNAMIC_ASSOC_VAR(var, gfunc, afunc) \
- do \
- { \
- v = make_new_assoc_variable (var); \
- v->dynamic_value = gfunc; \
- v->assign_func = afunc; \
- } \
- while (0)
-
-static SHELL_VAR *
-null_assign (self, value, unused, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t unused;
- char *key;
-{
- return (self);
-}
-
-#if defined (ARRAY_VARS)
-static SHELL_VAR *
-null_array_assign (self, value, ind, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t ind;
- char *key;
-{
- return (self);
-}
-#endif
-
-/* Degenerate `dynamic_value' function; just returns what's passed without
- manipulation. */
-static SHELL_VAR *
-get_self (self)
- SHELL_VAR *self;
-{
- return (self);
-}
-
-#if defined (ARRAY_VARS)
-/* A generic dynamic array variable initializer. Initialize array variable
- NAME with dynamic value function GETFUNC and assignment function SETFUNC. */
-static SHELL_VAR *
-init_dynamic_array_var (name, getfunc, setfunc, attrs)
- char *name;
- sh_var_value_func_t *getfunc;
- sh_var_assign_func_t *setfunc;
- int attrs;
-{
- SHELL_VAR *v;
-
- v = find_variable (name);
- if (v)
- return (v);
- INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc);
- if (attrs)
- VSETATTR (v, attrs);
- return v;
-}
-
-static SHELL_VAR *
-init_dynamic_assoc_var (name, getfunc, setfunc, attrs)
- char *name;
- sh_var_value_func_t *getfunc;
- sh_var_assign_func_t *setfunc;
- int attrs;
-{
- SHELL_VAR *v;
-
- v = find_variable (name);
- if (v)
- return (v);
- INIT_DYNAMIC_ASSOC_VAR (name, getfunc, setfunc);
- if (attrs)
- VSETATTR (v, attrs);
- return v;
-}
-#endif
-
-/* The value of $SECONDS. This is the number of seconds since shell
- invocation, or, the number of seconds since the last assignment + the
- value of the last assignment. */
-static intmax_t seconds_value_assigned;
-
-static SHELL_VAR *
-assign_seconds (self, value, unused, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t unused;
- char *key;
-{
- if (legal_number (value, &seconds_value_assigned) == 0)
- seconds_value_assigned = 0;
- shell_start_time = NOW;
- return (self);
-}
-
-static SHELL_VAR *
-get_seconds (var)
- SHELL_VAR *var;
-{
- time_t time_since_start;
- char *p;
-
- time_since_start = NOW - shell_start_time;
- p = itos(seconds_value_assigned + time_since_start);
-
- FREE (value_cell (var));
-
- VSETATTR (var, att_integer);
- var_setvalue (var, p);
- return (var);
-}
-
-static SHELL_VAR *
-init_seconds_var ()
-{
- SHELL_VAR *v;
-
- v = find_variable ("SECONDS");
- if (v)
- {
- if (legal_number (value_cell(v), &seconds_value_assigned) == 0)
- seconds_value_assigned = 0;
- }
- INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds);
- return v;
-}
-
-/* The random number seed. You can change this by setting RANDOM. */
-static unsigned long rseed = 1;
-static int last_random_value;
-static int seeded_subshell = 0;
-
-/* A linear congruential random number generator based on the example
- one in the ANSI C standard. This one isn't very good, but a more
- complicated one is overkill. */
-
-/* Returns a pseudo-random number between 0 and 32767. */
-static int
-brand ()
-{
- /* From "Random number generators: good ones are hard to find",
- Park and Miller, Communications of the ACM, vol. 31, no. 10,
- October 1988, p. 1195. filtered through FreeBSD */
- long h, l;
-
- /* Can't seed with 0. */
- if (rseed == 0)
- rseed = 123459876;
- h = rseed / 127773;
- l = rseed % 127773;
- rseed = 16807 * l - 2836 * h;
-#if 0
- if (rseed < 0)
- rseed += 0x7fffffff;
-#endif
- return ((unsigned int)(rseed & 32767)); /* was % 32768 */
-}
-
-/* Set the random number generator seed to SEED. */
-static void
-sbrand (seed)
- unsigned long seed;
-{
- rseed = seed;
- last_random_value = 0;
-}
-
-static void
-seedrand ()
-{
- struct timeval tv;
-
- gettimeofday (&tv, NULL);
- sbrand (tv.tv_sec ^ tv.tv_usec ^ getpid ());
-}
-
-static SHELL_VAR *
-assign_random (self, value, unused, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t unused;
- char *key;
-{
- sbrand (strtoul (value, (char **)NULL, 10));
- if (subshell_environment)
- seeded_subshell = getpid ();
- return (self);
-}
-
-int
-get_random_number ()
-{
- int rv, pid;
-
- /* Reset for command and process substitution. */
- pid = getpid ();
- if (subshell_environment && seeded_subshell != pid)
- {
- seedrand ();
- seeded_subshell = pid;
- }
-
- do
- rv = brand ();
- while (rv == last_random_value);
- return rv;
-}
-
-static SHELL_VAR *
-get_random (var)
- SHELL_VAR *var;
-{
- int rv;
- char *p;
-
- rv = get_random_number ();
- last_random_value = rv;
- p = itos (rv);
-
- FREE (value_cell (var));
-
- VSETATTR (var, att_integer);
- var_setvalue (var, p);
- return (var);
-}
-
-static SHELL_VAR *
-assign_lineno (var, value, unused, key)
- SHELL_VAR *var;
- char *value;
- arrayind_t unused;
- char *key;
-{
- intmax_t new_value;
-
- if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
- new_value = 0;
- line_number = line_number_base = new_value;
- return var;
-}
-
-/* Function which returns the current line number. */
-static SHELL_VAR *
-get_lineno (var)
- SHELL_VAR *var;
-{
- char *p;
- int ln;
-
- ln = executing_line_number ();
- p = itos (ln);
- FREE (value_cell (var));
- var_setvalue (var, p);
- return (var);
-}
-
-static SHELL_VAR *
-assign_subshell (var, value, unused, key)
- SHELL_VAR *var;
- char *value;
- arrayind_t unused;
- char *key;
-{
- intmax_t new_value;
-
- if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
- new_value = 0;
- subshell_level = new_value;
- return var;
-}
-
-static SHELL_VAR *
-get_subshell (var)
- SHELL_VAR *var;
-{
- char *p;
-
- p = itos (subshell_level);
- FREE (value_cell (var));
- var_setvalue (var, p);
- return (var);
-}
-
-static SHELL_VAR *
-get_bashpid (var)
- SHELL_VAR *var;
-{
- int pid;
- char *p;
-
- pid = getpid ();
- p = itos (pid);
-
- FREE (value_cell (var));
- VSETATTR (var, att_integer|att_readonly);
- var_setvalue (var, p);
- return (var);
-}
-
-static SHELL_VAR *
-get_bash_command (var)
- SHELL_VAR *var;
-{
- char *p;
-
- if (the_printed_command_except_trap)
- p = savestring (the_printed_command_except_trap);
- else
- {
- p = (char *)xmalloc (1);
- p[0] = '\0';
- }
- FREE (value_cell (var));
- var_setvalue (var, p);
- return (var);
-}
-
-#if defined (HISTORY)
-static SHELL_VAR *
-get_histcmd (var)
- SHELL_VAR *var;
-{
- char *p;
-
- p = itos (history_number ());
- FREE (value_cell (var));
- var_setvalue (var, p);
- return (var);
-}
-#endif
-
-#if defined (READLINE)
-/* When this function returns, VAR->value points to malloced memory. */
-static SHELL_VAR *
-get_comp_wordbreaks (var)
- SHELL_VAR *var;
-{
- /* If we don't have anything yet, assign a default value. */
- if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0)
- enable_hostname_completion (perform_hostname_completion);
-
- FREE (value_cell (var));
- var_setvalue (var, savestring (rl_completer_word_break_characters));
-
- return (var);
-}
-
-/* When this function returns, rl_completer_word_break_characters points to
- malloced memory. */
-static SHELL_VAR *
-assign_comp_wordbreaks (self, value, unused, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t unused;
- char *key;
-{
- if (rl_completer_word_break_characters &&
- rl_completer_word_break_characters != rl_basic_word_break_characters)
- free (rl_completer_word_break_characters);
-
- rl_completer_word_break_characters = savestring (value);
- return self;
-}
-#endif /* READLINE */
-
-#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
-static SHELL_VAR *
-assign_dirstack (self, value, ind, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t ind;
- char *key;
-{
- set_dirstack_element (ind, 1, value);
- return self;
-}
-
-static SHELL_VAR *
-get_dirstack (self)
- SHELL_VAR *self;
-{
- ARRAY *a;
- WORD_LIST *l;
-
- l = get_directory_stack (0);
- a = array_from_word_list (l);
- array_dispose (array_cell (self));
- dispose_words (l);
- var_setarray (self, a);
- return self;
-}
-#endif /* PUSHD AND POPD && ARRAY_VARS */
-
-#if defined (ARRAY_VARS)
-/* We don't want to initialize the group set with a call to getgroups()
- unless we're asked to, but we only want to do it once. */
-static SHELL_VAR *
-get_groupset (self)
- SHELL_VAR *self;
-{
- register int i;
- int ng;
- ARRAY *a;
- static char **group_set = (char **)NULL;
-
- if (group_set == 0)
- {
- group_set = get_group_list (&ng);
- a = array_cell (self);
- for (i = 0; i < ng; i++)
- array_insert (a, i, group_set[i]);
- }
- return (self);
-}
-
-static SHELL_VAR *
-build_hashcmd (self)
- SHELL_VAR *self;
-{
- HASH_TABLE *h;
- int i;
- char *k, *v;
- BUCKET_CONTENTS *item;
-
- h = assoc_cell (self);
- if (h)
- assoc_dispose (h);
-
- if (hashed_filenames == 0 || HASH_ENTRIES (hashed_filenames) == 0)
- {
- var_setvalue (self, (char *)NULL);
- return self;
- }
-
- h = assoc_create (hashed_filenames->nbuckets);
- for (i = 0; i < hashed_filenames->nbuckets; i++)
- {
- for (item = hash_items (i, hashed_filenames); item; item = item->next)
- {
- k = savestring (item->key);
- v = pathdata(item)->path;
- assoc_insert (h, k, v);
- }
- }
-
- var_setvalue (self, (char *)h);
- return self;
-}
-
-static SHELL_VAR *
-get_hashcmd (self)
- SHELL_VAR *self;
-{
- build_hashcmd (self);
- return (self);
-}
-
-static SHELL_VAR *
-assign_hashcmd (self, value, ind, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t ind;
- char *key;
-{
- phash_insert (key, value, 0, 0);
- return (build_hashcmd (self));
-}
-
-#if defined (ALIAS)
-static SHELL_VAR *
-build_aliasvar (self)
- SHELL_VAR *self;
-{
- HASH_TABLE *h;
- int i;
- char *k, *v;
- BUCKET_CONTENTS *item;
-
- h = assoc_cell (self);
- if (h)
- assoc_dispose (h);
-
- if (aliases == 0 || HASH_ENTRIES (aliases) == 0)
- {
- var_setvalue (self, (char *)NULL);
- return self;
- }
-
- h = assoc_create (aliases->nbuckets);
- for (i = 0; i < aliases->nbuckets; i++)
- {
- for (item = hash_items (i, aliases); item; item = item->next)
- {
- k = savestring (item->key);
- v = ((alias_t *)(item->data))->value;
- assoc_insert (h, k, v);
- }
- }
-
- var_setvalue (self, (char *)h);
- return self;
-}
-
-static SHELL_VAR *
-get_aliasvar (self)
- SHELL_VAR *self;
-{
- build_aliasvar (self);
- return (self);
-}
-
-static SHELL_VAR *
-assign_aliasvar (self, value, ind, key)
- SHELL_VAR *self;
- char *value;
- arrayind_t ind;
- char *key;
-{
- add_alias (key, value);
- return (build_aliasvar (self));
-}
-#endif /* ALIAS */
-
-#endif /* ARRAY_VARS */
-
-/* If ARRAY_VARS is not defined, this just returns the name of any
- currently-executing function. If we have arrays, it's a call stack. */
-static SHELL_VAR *
-get_funcname (self)
- SHELL_VAR *self;
-{
-#if ! defined (ARRAY_VARS)
- char *t;
- if (variable_context && this_shell_function)
- {
- FREE (value_cell (self));
- t = savestring (this_shell_function->name);
- var_setvalue (self, t);
- }
-#endif
- return (self);
-}
-
-void
-make_funcname_visible (on_or_off)
- int on_or_off;
-{
- SHELL_VAR *v;
-
- v = find_variable ("FUNCNAME");
- if (v == 0 || v->dynamic_value == 0)
- return;
-
- if (on_or_off)
- VUNSETATTR (v, att_invisible);
- else
- VSETATTR (v, att_invisible);
-}
-
-static SHELL_VAR *
-init_funcname_var ()
-{
- SHELL_VAR *v;
-
- v = find_variable ("FUNCNAME");
- if (v)
- return v;
-#if defined (ARRAY_VARS)
- INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign);
-#else
- INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign);
-#endif
- VSETATTR (v, att_invisible|att_noassign);
- return v;
-}
-
-static void
-initialize_dynamic_variables ()
-{
- SHELL_VAR *v;
-
- v = init_seconds_var ();
-
- INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL);
- INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell);
-
- INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random);
- VSETATTR (v, att_integer);
- INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno);
- VSETATTR (v, att_integer);
-
- INIT_DYNAMIC_VAR ("BASHPID", (char *)NULL, get_bashpid, null_assign);
- VSETATTR (v, att_integer|att_readonly);
-
-#if defined (HISTORY)
- INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL);
- VSETATTR (v, att_integer);
-#endif
-
-#if defined (READLINE)
- INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks);
-#endif
-
-#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
- v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0);
-#endif /* PUSHD_AND_POPD && ARRAY_VARS */
-
-#if defined (ARRAY_VARS)
- v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign);
-
-# if defined (DEBUGGER)
- v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset);
- v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset);
-# endif /* DEBUGGER */
- v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset);
- v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset);
-
- v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_nofree);
-# if defined (ALIAS)
- v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_nofree);
-# endif
-#endif
-
- v = init_funcname_var ();
-}
-
-/* **************************************************************** */
-/* */
-/* Retrieving variables and values */
-/* */
-/* **************************************************************** */
-
-/* How to get a pointer to the shell variable or function named NAME.
- HASHED_VARS is a pointer to the hash table containing the list
- of interest (either variables or functions). */
-
-static SHELL_VAR *
-hash_lookup (name, hashed_vars)
- const char *name;
- HASH_TABLE *hashed_vars;
-{
- BUCKET_CONTENTS *bucket;
-
- bucket = hash_search (name, hashed_vars, 0);
- /* If we find the name in HASHED_VARS, set LAST_TABLE_SEARCHED to that
- table. */
- if (bucket)
- last_table_searched = hashed_vars;
- return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL);
-}
-
-SHELL_VAR *
-var_lookup (name, vcontext)
- const char *name;
- VAR_CONTEXT *vcontext;
-{
- VAR_CONTEXT *vc;
- SHELL_VAR *v;
-
- v = (SHELL_VAR *)NULL;
- for (vc = vcontext; vc; vc = vc->down)
- if (v = hash_lookup (name, vc->table))
- break;
-
- return v;
-}
-
-/* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero,
- then also search the temporarily built list of exported variables.
- The lookup order is:
- temporary_env
- shell_variables list
-*/
-
-SHELL_VAR *
-find_variable_internal (name, flags)
- const char *name;
- int flags;
-{
- SHELL_VAR *var;
- int search_tempenv, force_tempenv;
- VAR_CONTEXT *vc;
-
- var = (SHELL_VAR *)NULL;
-
- force_tempenv = (flags & FV_FORCETEMPENV);
-
- /* If explicitly requested, first look in the temporary environment for
- the variable. This allows constructs such as "foo=x eval 'echo $foo'"
- to get the `exported' value of $foo. This happens if we are executing
- a function or builtin, or if we are looking up a variable in a
- "subshell environment". */
- search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment);
-
- if (search_tempenv && temporary_env)
- var = hash_lookup (name, temporary_env);
-
- if (var == 0)
- {
- if ((flags & FV_SKIPINVISIBLE) == 0)
- var = var_lookup (name, shell_variables);
- else
- {
- /* essentially var_lookup expanded inline so we can check for
- att_invisible */
- for (vc = shell_variables; vc; vc = vc->down)
- {
- var = hash_lookup (name, vc->table);
- if (var && invisible_p (var))
- var = 0;
- if (var)
- break;
- }
- }
- }
-
- if (var == 0)
- return ((SHELL_VAR *)NULL);
-
- return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
-}
-
-/* Look up and resolve the chain of nameref variables starting at V all the
- way to NULL or non-nameref. */
-SHELL_VAR *
-find_variable_nameref (v)
- SHELL_VAR *v;
-{
- int level, flags;
- char *newname;
- SHELL_VAR *orig, *oldv;
-
- level = 0;
- orig = v;
- while (v && nameref_p (v))
- {
- level++;
- if (level > NAMEREF_MAX)
- return ((SHELL_VAR *)0); /* error message here? */
- newname = nameref_cell (v);
- if (newname == 0 || *newname == '\0')
- return ((SHELL_VAR *)0);
- oldv = v;
- flags = 0;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (newname, flags);
- if (v == orig || v == oldv)
- {
- internal_warning (_("%s: circular name reference"), orig->name);
- return ((SHELL_VAR *)0);
- }
- }
- return v;
-}
-
-/* Resolve the chain of nameref variables for NAME. XXX - could change later */
-SHELL_VAR *
-find_variable_last_nameref (name)
- const char *name;
-{
- SHELL_VAR *v, *nv;
- char *newname;
- int level, flags;
-
- nv = v = find_variable_noref (name);
- level = 0;
- while (v && nameref_p (v))
- {
- level++;
- if (level > NAMEREF_MAX)
- return ((SHELL_VAR *)0); /* error message here? */
- newname = nameref_cell (v);
- if (newname == 0 || *newname == '\0')
- return ((SHELL_VAR *)0);
- nv = v;
- flags = 0;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (newname, flags);
- }
- return nv;
-}
-
-/* Resolve the chain of nameref variables for NAME. XXX - could change later */
-SHELL_VAR *
-find_global_variable_last_nameref (name)
- const char *name;
-{
- SHELL_VAR *v, *nv;
- char *newname;
- int level;
-
- nv = v = find_global_variable_noref (name);
- level = 0;
- while (v && nameref_p (v))
- {
- level++;
- if (level > NAMEREF_MAX)
- return ((SHELL_VAR *)0); /* error message here? */
- newname = nameref_cell (v);
- if (newname == 0 || *newname == '\0')
- return ((SHELL_VAR *)0);
- nv = v;
- v = find_global_variable_noref (newname);
- }
- return nv;
-}
-
-static SHELL_VAR *
-find_nameref_at_context (v, vc)
- SHELL_VAR *v;
- VAR_CONTEXT *vc;
-{
- SHELL_VAR *nv, *nv2;
- VAR_CONTEXT *nvc;
- char *newname;
- int level;
-
- nv = v;
- level = 1;
- while (nv && nameref_p (nv))
- {
- level++;
- if (level > NAMEREF_MAX)
- return ((SHELL_VAR *)NULL);
- newname = nameref_cell (nv);
- if (newname == 0 || *newname == '\0')
- return ((SHELL_VAR *)NULL);
- nv2 = hash_lookup (newname, vc->table);
- if (nv2 == 0)
- break;
- nv = nv2;
- }
- return nv;
-}
-
-/* Do nameref resolution from the VC, which is the local context for some
- function or builtin, `up' the chain to the global variables context. If
- NVCP is not NULL, return the variable context where we finally ended the
- nameref resolution (so the bind_variable_internal can use the correct
- variable context and hash table). */
-static SHELL_VAR *
-find_variable_nameref_context (v, vc, nvcp)
- SHELL_VAR *v;
- VAR_CONTEXT *vc;
- VAR_CONTEXT **nvcp;
-{
- SHELL_VAR *nv, *nv2;
- VAR_CONTEXT *nvc;
-
- /* Look starting at the current context all the way `up' */
- for (nv = v, nvc = vc; nvc; nvc = nvc->down)
- {
- nv2 = find_nameref_at_context (nv, nvc);
- if (nv2 == 0)
- continue;
- nv = nv2;
- if (*nvcp)
- *nvcp = nvc;
- if (nameref_p (nv) == 0)
- break;
- }
- return (nameref_p (nv) ? (SHELL_VAR *)NULL : nv);
-}
-
-/* Do nameref resolution from the VC, which is the local context for some
- function or builtin, `up' the chain to the global variables context. If
- NVCP is not NULL, return the variable context where we finally ended the
- nameref resolution (so the bind_variable_internal can use the correct
- variable context and hash table). */
-static SHELL_VAR *
-find_variable_last_nameref_context (v, vc, nvcp)
- SHELL_VAR *v;
- VAR_CONTEXT *vc;
- VAR_CONTEXT **nvcp;
-{
- SHELL_VAR *nv, *nv2;
- VAR_CONTEXT *nvc;
-
- /* Look starting at the current context all the way `up' */
- for (nv = v, nvc = vc; nvc; nvc = nvc->down)
- {
- nv2 = find_nameref_at_context (nv, nvc);
- if (nv2 == 0)
- continue;
- nv = nv2;
- if (*nvcp)
- *nvcp = nvc;
- }
- return (nameref_p (nv) ? nv : (SHELL_VAR *)NULL);
-}
-
-/* Find a variable, forcing a search of the temporary environment first */
-SHELL_VAR *
-find_variable_tempenv (name)
- const char *name;
-{
- SHELL_VAR *var;
-
- var = find_variable_internal (name, FV_FORCETEMPENV);
- if (var && nameref_p (var))
- var = find_variable_nameref (var);
- return (var);
-}
-
-/* Find a variable, not forcing a search of the temporary environment first */
-SHELL_VAR *
-find_variable_notempenv (name)
- const char *name;
-{
- SHELL_VAR *var;
-
- var = find_variable_internal (name, 0);
- if (var && nameref_p (var))
- var = find_variable_nameref (var);
- return (var);
-}
-
-SHELL_VAR *
-find_global_variable (name)
- const char *name;
-{
- SHELL_VAR *var;
-
- var = var_lookup (name, global_variables);
- if (var && nameref_p (var))
- var = find_variable_nameref (var);
-
- if (var == 0)
- return ((SHELL_VAR *)NULL);
-
- return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
-}
-
-SHELL_VAR *
-find_global_variable_noref (name)
- const char *name;
-{
- SHELL_VAR *var;
-
- var = var_lookup (name, global_variables);
-
- if (var == 0)
- return ((SHELL_VAR *)NULL);
-
- return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
-}
-
-SHELL_VAR *
-find_shell_variable (name)
- const char *name;
-{
- SHELL_VAR *var;
-
- var = var_lookup (name, shell_variables);
- if (var && nameref_p (var))
- var = find_variable_nameref (var);
-
- if (var == 0)
- return ((SHELL_VAR *)NULL);
-
- return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
-}
-
-/* Look up the variable entry named NAME. Returns the entry or NULL. */
-SHELL_VAR *
-find_variable (name)
- const char *name;
-{
- SHELL_VAR *v;
- int flags;
-
- last_table_searched = 0;
- flags = 0;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (name, flags);
- if (v && nameref_p (v))
- v = find_variable_nameref (v);
- return v;
-}
-
-/* Find the first instance of NAME in the variable context chain; return first
- one found without att_invisible set; return 0 if no non-invisible instances
- found. */
-SHELL_VAR *
-find_variable_no_invisible (name)
- const char *name;
-{
- SHELL_VAR *v;
- int flags;
-
- last_table_searched = 0;
- flags = FV_SKIPINVISIBLE;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (name, flags);
- if (v && nameref_p (v))
- v = find_variable_nameref (v);
- return v;
-}
-
-/* Find the first instance of NAME in the variable context chain; return first
- one found even if att_invisible set. */
-SHELL_VAR *
-find_variable_for_assignment (name)
- const char *name;
-{
- SHELL_VAR *v;
- int flags;
-
- last_table_searched = 0;
- flags = 0;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (name, flags);
- if (v && nameref_p (v))
- v = find_variable_nameref (v);
- return v;
-}
-
-SHELL_VAR *
-find_variable_noref (name)
- const char *name;
-{
- SHELL_VAR *v;
- int flags;
-
- flags = 0;
- if (expanding_redir == 0 && (assigning_in_environment || executing_builtin))
- flags |= FV_FORCETEMPENV;
- v = find_variable_internal (name, flags);
- return v;
-}
-
-/* Look up the function entry whose name matches STRING.
- Returns the entry or NULL. */
-SHELL_VAR *
-find_function (name)
- const char *name;
-{
- return (hash_lookup (name, shell_functions));
-}
-
-/* Find the function definition for the shell function named NAME. Returns
- the entry or NULL. */
-FUNCTION_DEF *
-find_function_def (name)
- const char *name;
-{
-#if defined (DEBUGGER)
- return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs));
-#else
- return ((FUNCTION_DEF *)0);
-#endif
-}
-
-/* Return the value of VAR. VAR is assumed to have been the result of a
- lookup without any subscript, if arrays are compiled into the shell. */
-char *
-get_variable_value (var)
- SHELL_VAR *var;
-{
- if (var == 0)
- return ((char *)NULL);
-#if defined (ARRAY_VARS)
- else if (array_p (var))
- return (array_reference (array_cell (var), 0));
- else if (assoc_p (var))
- return (assoc_reference (assoc_cell (var), "0"));
-#endif
- else
- return (value_cell (var));
-}
-
-/* Return the string value of a variable. Return NULL if the variable
- doesn't exist. Don't cons a new string. This is a potential memory
- leak if the variable is found in the temporary environment. Since
- functions and variables have separate name spaces, returns NULL if
- var_name is a shell function only. */
-char *
-get_string_value (var_name)
- const char *var_name;
-{
- SHELL_VAR *var;
-
- var = find_variable (var_name);
- return ((var) ? get_variable_value (var) : (char *)NULL);
-}
-
-/* This is present for use by the tilde and readline libraries. */
-char *
-sh_get_env_value (v)
- const char *v;
-{
- return get_string_value (v);
-}
-
-/* **************************************************************** */
-/* */
-/* Creating and setting variables */
-/* */
-/* **************************************************************** */
-
-/* Set NAME to VALUE if NAME has no value. */
-SHELL_VAR *
-set_if_not (name, value)
- char *name, *value;
-{
- SHELL_VAR *v;
-
- if (shell_variables == 0)
- create_variable_tables ();
-
- v = find_variable (name);
- if (v == 0)
- v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0);
- return (v);
-}
-
-/* Create a local variable referenced by NAME. */
-SHELL_VAR *
-make_local_variable (name)
- const char *name;
-{
- SHELL_VAR *new_var, *old_var;
- VAR_CONTEXT *vc;
- int was_tmpvar;
- char *tmp_value;
-
- /* local foo; local foo; is a no-op. */
- old_var = find_variable (name);
- if (old_var && local_p (old_var) && old_var->context == variable_context)
- return (old_var);
-
- was_tmpvar = old_var && tempvar_p (old_var);
- /* If we're making a local variable in a shell function, the temporary env
- has already been merged into the function's variable context stack. We
- can assume that a temporary var in the same context appears in the same
- VAR_CONTEXT and can safely be returned without creating a new variable
- (which results in duplicate names in the same VAR_CONTEXT->table */
- /* We can't just test tmpvar_p because variables in the temporary env given
- to a shell function appear in the function's local variable VAR_CONTEXT
- but retain their tempvar attribute. We want temporary variables that are
- found in temporary_env, hence the test for last_table_searched, which is
- set in hash_lookup and only (so far) checked here. */
- if (was_tmpvar && old_var->context == variable_context && last_table_searched != temporary_env)
- {
- VUNSETATTR (old_var, att_invisible); /* XXX */
- return (old_var);
- }
- if (was_tmpvar)
- tmp_value = value_cell (old_var);
-
- for (vc = shell_variables; vc; vc = vc->down)
- if (vc_isfuncenv (vc) && vc->scope == variable_context)
- break;
-
- if (vc == 0)
- {
- internal_error (_("make_local_variable: no function context at current scope"));
- return ((SHELL_VAR *)NULL);
- }
- else if (vc->table == 0)
- vc->table = hash_create (TEMPENV_HASH_BUCKETS);
-
- /* Since this is called only from the local/declare/typeset code, we can
- call builtin_error here without worry (of course, it will also work
- for anything that sets this_command_name). Variables with the `noassign'
- attribute may not be made local. The test against old_var's context
- level is to disallow local copies of readonly global variables (since I
- believe that this could be a security hole). Readonly copies of calling
- function local variables are OK. */
- if (old_var && (noassign_p (old_var) ||
- (readonly_p (old_var) && old_var->context == 0)))
- {
- if (readonly_p (old_var))
- sh_readonly (name);
- else if (noassign_p (old_var))
- builtin_error (_("%s: variable may not be assigned value"), name);
-#if 0
- /* Let noassign variables through with a warning */
- if (readonly_p (old_var))
-#endif
- return ((SHELL_VAR *)NULL);
- }
-
- if (old_var == 0)
- new_var = make_new_variable (name, vc->table);
- else
- {
- new_var = make_new_variable (name, vc->table);
-
- /* If we found this variable in one of the temporary environments,
- inherit its value. Watch to see if this causes problems with
- things like `x=4 local x'. XXX - see above for temporary env
- variables with the same context level as variable_context */
- /* XXX - we should only do this if the variable is not an array. */
- if (was_tmpvar)
- var_setvalue (new_var, savestring (tmp_value));
-
- new_var->attributes = exported_p (old_var) ? att_exported : 0;
- }
-
- vc->flags |= VC_HASLOCAL;
-
- new_var->context = variable_context;
- VSETATTR (new_var, att_local);
-
- if (ifsname (name))
- setifs (new_var);
-
- if (was_tmpvar == 0 && no_invisible_vars == 0)
- VSETATTR (new_var, att_invisible); /* XXX */
- return (new_var);
-}
-
-/* Create a new shell variable with name NAME. */
-static SHELL_VAR *
-new_shell_variable (name)
- const char *name;
-{
- SHELL_VAR *entry;
-
- entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
-
- entry->name = savestring (name);
- var_setvalue (entry, (char *)NULL);
- CLEAR_EXPORTSTR (entry);
-
- entry->dynamic_value = (sh_var_value_func_t *)NULL;
- entry->assign_func = (sh_var_assign_func_t *)NULL;
-
- entry->attributes = 0;
-
- /* Always assume variables are to be made at toplevel!
- make_local_variable has the responsibility of changing the
- variable context. */
- entry->context = 0;
-
- return (entry);
-}
-
-/* Create a new shell variable with name NAME and add it to the hash table
- TABLE. */
-static SHELL_VAR *
-make_new_variable (name, table)
- const char *name;
- HASH_TABLE *table;
-{
- SHELL_VAR *entry;
- BUCKET_CONTENTS *elt;
-
- entry = new_shell_variable (name);
-
- /* Make sure we have a shell_variables hash table to add to. */
- if (shell_variables == 0)
- create_variable_tables ();
-
- elt = hash_insert (savestring (name), table, HASH_NOSRCH);
- elt->data = (PTR_T)entry;
-
- return entry;
-}
-
-#if defined (ARRAY_VARS)
-SHELL_VAR *
-make_new_array_variable (name)
- char *name;
-{
- SHELL_VAR *entry;
- ARRAY *array;
-
- entry = make_new_variable (name, global_variables->table);
- array = array_create ();
-
- var_setarray (entry, array);
- VSETATTR (entry, att_array);
- return entry;
-}
-
-SHELL_VAR *
-make_local_array_variable (name, assoc_ok)
- char *name;
- int assoc_ok;
-{
- SHELL_VAR *var;
- ARRAY *array;
-
- var = make_local_variable (name);
- if (var == 0 || array_p (var) || (assoc_ok && assoc_p (var)))
- return var;
-
- array = array_create ();
-
- dispose_variable_value (var);
- var_setarray (var, array);
- VSETATTR (var, att_array);
- return var;
-}
-
-SHELL_VAR *
-make_new_assoc_variable (name)
- char *name;
-{
- SHELL_VAR *entry;
- HASH_TABLE *hash;
-
- entry = make_new_variable (name, global_variables->table);
- hash = assoc_create (0);
-
- var_setassoc (entry, hash);
- VSETATTR (entry, att_assoc);
- return entry;
-}
-
-SHELL_VAR *
-make_local_assoc_variable (name)
- char *name;
-{
- SHELL_VAR *var;
- HASH_TABLE *hash;
-
- var = make_local_variable (name);
- if (var == 0 || assoc_p (var))
- return var;
-
- dispose_variable_value (var);
- hash = assoc_create (0);
-
- var_setassoc (var, hash);
- VSETATTR (var, att_assoc);
- return var;
-}
-#endif
-
-char *
-make_variable_value (var, value, flags)
- SHELL_VAR *var;
- char *value;
- int flags;
-{
- char *retval, *oval;
- intmax_t lval, rval;
- int expok, olen, op;
-
- /* If this variable has had its type set to integer (via `declare -i'),
- then do expression evaluation on it and store the result. The
- functions in expr.c (evalexp()) and bind_int_variable() are responsible
- for turning off the integer flag if they don't want further
- evaluation done. */
- if (integer_p (var))
- {
- if (flags & ASS_APPEND)
- {
- oval = value_cell (var);
- lval = evalexp (oval, &expok); /* ksh93 seems to do this */
- if (expok == 0)
- {
- top_level_cleanup ();
- jump_to_top_level (DISCARD);
- }
- }
- rval = evalexp (value, &expok);
- if (expok == 0)
- {
- top_level_cleanup ();
- jump_to_top_level (DISCARD);
- }
- /* This can be fooled if the variable's value changes while evaluating
- `rval'. We can change it if we move the evaluation of lval to here. */
- if (flags & ASS_APPEND)
- rval += lval;
- retval = itos (rval);
- }
-#if defined (CASEMOD_ATTRS)
- else if (capcase_p (var) || uppercase_p (var) || lowercase_p (var))
- {
- if (flags & ASS_APPEND)
- {
- oval = get_variable_value (var);
- if (oval == 0) /* paranoia */
- oval = "";
- olen = STRLEN (oval);
- retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
- strcpy (retval, oval);
- if (value)
- strcpy (retval+olen, value);
- }
- else if (*value)
- retval = savestring (value);
- else
- {
- retval = (char *)xmalloc (1);
- retval[0] = '\0';
- }
- op = capcase_p (var) ? CASE_CAPITALIZE
- : (uppercase_p (var) ? CASE_UPPER : CASE_LOWER);
- oval = sh_modcase (retval, (char *)0, op);
- free (retval);
- retval = oval;
- }
-#endif /* CASEMOD_ATTRS */
- else if (value)
- {
- if (flags & ASS_APPEND)
- {
- oval = get_variable_value (var);
- if (oval == 0) /* paranoia */
- oval = "";
- olen = STRLEN (oval);
- retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
- strcpy (retval, oval);
- if (value)
- strcpy (retval+olen, value);
- }
- else if (*value)
- retval = savestring (value);
- else
- {
- retval = (char *)xmalloc (1);
- retval[0] = '\0';
- }
- }
- else
- retval = (char *)NULL;
-
- return retval;
-}
-
-/* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the
- temporary environment (but usually is not). */
-static SHELL_VAR *
-bind_variable_internal (name, value, table, hflags, aflags)
- const char *name;
- char *value;
- HASH_TABLE *table;
- int hflags, aflags;
-{
- char *newval;
- SHELL_VAR *entry;
-
- entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table);
- /* Follow the nameref chain here if this is the global variables table */
- if (entry && nameref_p (entry) && (invisible_p (entry) == 0) && table == global_variables->table)
- {
- entry = find_global_variable (entry->name);
- /* Let's see if we have a nameref referencing a variable that hasn't yet
- been created. */
- if (entry == 0)
- entry = find_variable_last_nameref (name); /* XXX */
- if (entry == 0) /* just in case */
- return (entry);
- }
-
- /* The first clause handles `declare -n ref; ref=x;' */
- if (entry && invisible_p (entry) && nameref_p (entry))
- goto assign_value;
- else if (entry && nameref_p (entry))
- {
- newval = nameref_cell (entry);
-#if defined (ARRAY_VARS)
- /* declare -n foo=x[2] */
- if (valid_array_reference (newval))
- /* XXX - should it be aflags? */
- entry = assign_array_element (newval, make_variable_value (entry, value, 0), aflags);
- else
-#endif
- {
- entry = make_new_variable (newval, table);
- var_setvalue (entry, make_variable_value (entry, value, 0));
- }
- }
- else if (entry == 0)
- {
- entry = make_new_variable (name, table);
- var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */
- }
- else if (entry->assign_func) /* array vars have assign functions now */
- {
- INVALIDATE_EXPORTSTR (entry);
- newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value;
- if (assoc_p (entry))
- entry = (*(entry->assign_func)) (entry, newval, -1, savestring ("0"));
- else if (array_p (entry))
- entry = (*(entry->assign_func)) (entry, newval, 0, 0);
- else
- entry = (*(entry->assign_func)) (entry, newval, -1, 0);
- if (newval != value)
- free (newval);
- return (entry);
- }
- else
- {
-assign_value:
- if (readonly_p (entry) || noassign_p (entry))
- {
- if (readonly_p (entry))
- err_readonly (name);
- return (entry);
- }
-
- /* Variables which are bound are visible. */
- VUNSETATTR (entry, att_invisible);
-
-#if defined (ARRAY_VARS)
- if (assoc_p (entry) || array_p (entry))
- newval = make_array_variable_value (entry, 0, "0", value, aflags);
- else
-#endif
-
- newval = make_variable_value (entry, value, aflags); /* XXX */
-
- /* Invalidate any cached export string */
- INVALIDATE_EXPORTSTR (entry);
-
-#if defined (ARRAY_VARS)
- /* XXX -- this bears looking at again -- XXX */
- /* If an existing array variable x is being assigned to with x=b or
- `read x' or something of that nature, silently convert it to
- x[0]=b or `read x[0]'. */
- if (assoc_p (entry))
- {
- assoc_insert (assoc_cell (entry), savestring ("0"), newval);
- free (newval);
- }
- else if (array_p (entry))
- {
- array_insert (array_cell (entry), 0, newval);
- free (newval);
- }
- else
-#endif
- {
- FREE (value_cell (entry));
- var_setvalue (entry, newval);
- }
- }
-
- if (mark_modified_vars)
- VSETATTR (entry, att_exported);
-
- if (exported_p (entry))
- array_needs_making = 1;
-
- return (entry);
-}
-
-/* Bind a variable NAME to VALUE. This conses up the name
- and value strings. If we have a temporary environment, we bind there
- first, then we bind into shell_variables. */
-
-SHELL_VAR *
-bind_variable (name, value, flags)
- const char *name;
- char *value;
- int flags;
-{
- SHELL_VAR *v, *nv;
- VAR_CONTEXT *vc, *nvc;
- int level;
-
- if (shell_variables == 0)
- create_variable_tables ();
-
- /* If we have a temporary environment, look there first for the variable,
- and, if found, modify the value there before modifying it in the
- shell_variables table. This allows sourced scripts to modify values
- given to them in a temporary environment while modifying the variable
- value that the caller sees. */
- if (temporary_env)
- bind_tempenv_variable (name, value);
-
- /* XXX -- handle local variables here. */
- for (vc = shell_variables; vc; vc = vc->down)
- {
- if (vc_isfuncenv (vc) || vc_isbltnenv (vc))
- {
- v = hash_lookup (name, vc->table);
- nvc = vc;
- if (v && nameref_p (v))
- {
- nv = find_variable_nameref_context (v, vc, &nvc);
- if (nv == 0)
- {
- nv = find_variable_last_nameref_context (v, vc, &nvc);
- if (nv && nameref_p (nv))
- {
- /* If this nameref variable doesn't have a value yet,
- set the value. Otherwise, assign using the value as
- normal. */
- if (nameref_cell (nv) == 0)
- return (bind_variable_internal (nv->name, value, nvc->table, 0, flags));
-#if defined (ARRAY_VARS)
- else if (valid_array_reference (nameref_cell (nv)))
- return (assign_array_element (nameref_cell (nv), value, flags));
- else
-#endif
- return (bind_variable_internal (nameref_cell (nv), value, nvc->table, 0, flags));
- }
- else
- v = nv;
- }
- else
- v = nv;
- }
- if (v)
- return (bind_variable_internal (v->name, value, nvc->table, 0, flags));
- }
- }
- /* bind_variable_internal will handle nameref resolution in this case */
- return (bind_variable_internal (name, value, global_variables->table, 0, flags));
-}
-
-SHELL_VAR *
-bind_global_variable (name, value, flags)
- const char *name;
- char *value;
- int flags;
-{
- SHELL_VAR *v, *nv;
- VAR_CONTEXT *vc, *nvc;
- int level;
-
- if (shell_variables == 0)
- create_variable_tables ();
-
- /* bind_variable_internal will handle nameref resolution in this case */
- return (bind_variable_internal (name, value, global_variables->table, 0, flags));
-}
-
-/* Make VAR, a simple shell variable, have value VALUE. Once assigned a
- value, variables are no longer invisible. This is a duplicate of part
- of the internals of bind_variable. If the variable is exported, or
- all modified variables should be exported, mark the variable for export
- and note that the export environment needs to be recreated. */
-SHELL_VAR *
-bind_variable_value (var, value, aflags)
- SHELL_VAR *var;
- char *value;
- int aflags;
-{
- char *t;
- int invis;
-
- invis = invisible_p (var);
- VUNSETATTR (var, att_invisible);
-
- if (var->assign_func)
- {
- /* If we're appending, we need the old value, so use
- make_variable_value */
- t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value;
- (*(var->assign_func)) (var, t, -1, 0);
- if (t != value && t)
- free (t);
- }
- else
- {
- t = make_variable_value (var, value, aflags);
-#if defined (ARRAY_VARS)
- if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || (legal_identifier (t) == 0 && valid_array_reference (t) == 0)))
-#else
- if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || legal_identifier (t) == 0))
-#endif
- {
- free (t);
- if (invis)
- VSETATTR (var, att_invisible); /* XXX */
- return ((SHELL_VAR *)NULL);
- }
- FREE (value_cell (var));
- var_setvalue (var, t);
- }
-
- INVALIDATE_EXPORTSTR (var);
-
- if (mark_modified_vars)
- VSETATTR (var, att_exported);
-
- if (exported_p (var))
- array_needs_making = 1;
-
- return (var);
-}
-
-/* Bind/create a shell variable with the name LHS to the RHS.
- This creates or modifies a variable such that it is an integer.
-
- This used to be in expr.c, but it is here so that all of the
- variable binding stuff is localized. Since we don't want any
- recursive evaluation from bind_variable() (possible without this code,
- since bind_variable() calls the evaluator for variables with the integer
- attribute set), we temporarily turn off the integer attribute for each
- variable we set here, then turn it back on after binding as necessary. */
-
-SHELL_VAR *
-bind_int_variable (lhs, rhs)
- char *lhs, *rhs;
-{
- register SHELL_VAR *v;
- int isint, isarr, implicitarray;
-
- isint = isarr = implicitarray = 0;
-#if defined (ARRAY_VARS)
- if (valid_array_reference (lhs))
- {
- isarr = 1;
- v = array_variable_part (lhs, (char **)0, (int *)0);
- }
- else
-#endif
- v = find_variable (lhs);
-
- if (v)
- {
- isint = integer_p (v);
- VUNSETATTR (v, att_integer);
-#if defined (ARRAY_VARS)
- if (array_p (v) && isarr == 0)
- implicitarray = 1;
-#endif
- }
-
-#if defined (ARRAY_VARS)
- if (isarr)
- v = assign_array_element (lhs, rhs, 0);
- else if (implicitarray)
- v = bind_array_variable (lhs, 0, rhs, 0);
- else
-#endif
- v = bind_variable (lhs, rhs, 0);
-
- if (v && isint)
- VSETATTR (v, att_integer);
-
- VUNSETATTR (v, att_invisible);
-
- return (v);
-}
-
-SHELL_VAR *
-bind_var_to_int (var, val)
- char *var;
- intmax_t val;
-{
- char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p;
-
- p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0);
- return (bind_int_variable (var, p));
-}
-
-/* Do a function binding to a variable. You pass the name and
- the command to bind to. This conses the name and command. */
-SHELL_VAR *
-bind_function (name, value)
- const char *name;
- COMMAND *value;
-{
- SHELL_VAR *entry;
-
- entry = find_function (name);
- if (entry == 0)
- {
- BUCKET_CONTENTS *elt;
-
- elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH);
- entry = new_shell_variable (name);
- elt->data = (PTR_T)entry;
- }
- else
- INVALIDATE_EXPORTSTR (entry);
-
- if (var_isset (entry))
- dispose_command (function_cell (entry));
-
- if (value)
- var_setfunc (entry, copy_command (value));
- else
- var_setfunc (entry, 0);
-
- VSETATTR (entry, att_function);
-
- if (mark_modified_vars)
- VSETATTR (entry, att_exported);
-
- VUNSETATTR (entry, att_invisible); /* Just to be sure */
-
- if (exported_p (entry))
- array_needs_making = 1;
-
-#if defined (PROGRAMMABLE_COMPLETION)
- set_itemlist_dirty (&it_functions);
-#endif
-
- return (entry);
-}
-
-#if defined (DEBUGGER)
-/* Bind a function definition, which includes source file and line number
- information in addition to the command, into the FUNCTION_DEF hash table.*/
-void
-bind_function_def (name, value)
- const char *name;
- FUNCTION_DEF *value;
-{
- FUNCTION_DEF *entry;
- BUCKET_CONTENTS *elt;
- COMMAND *cmd;
-
- entry = find_function_def (name);
- if (entry)
- {
- dispose_function_def_contents (entry);
- entry = copy_function_def_contents (value, entry);
- }
- else
- {
- cmd = value->command;
- value->command = 0;
- entry = copy_function_def (value);
- value->command = cmd;
-
- elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH);
- elt->data = (PTR_T *)entry;
- }
-}
-#endif /* DEBUGGER */
-
-/* Add STRING, which is of the form foo=bar, to the temporary environment
- HASH_TABLE (temporary_env). The functions in execute_cmd.c are
- responsible for moving the main temporary env to one of the other
- temporary environments. The expansion code in subst.c calls this. */
-int
-assign_in_env (word, flags)
- WORD_DESC *word;
- int flags;
-{
- int offset, aflags;
- char *name, *temp, *value;
- SHELL_VAR *var;
- const char *string;
-
- string = word->word;
-
- aflags = 0;
- offset = assignment (string, 0);
- name = savestring (string);
- value = (char *)NULL;
-
- if (name[offset] == '=')
- {
- name[offset] = 0;
-
- /* don't ignore the `+' when assigning temporary environment */
- if (name[offset - 1] == '+')
- {
- name[offset - 1] = '\0';
- aflags |= ASS_APPEND;
- }
-
- var = find_variable (name);
- if (var && (readonly_p (var) || noassign_p (var)))
- {
- if (readonly_p (var))
- err_readonly (name);
- free (name);
- return (0);
- }
-
- temp = name + offset + 1;
- value = expand_assignment_string_to_string (temp, 0);
-
- if (var && (aflags & ASS_APPEND))
- {
- temp = make_variable_value (var, value, aflags);
- FREE (value);
- value = temp;
- }
- }
-
- if (temporary_env == 0)
- temporary_env = hash_create (TEMPENV_HASH_BUCKETS);
-
- var = hash_lookup (name, temporary_env);
- if (var == 0)
- var = make_new_variable (name, temporary_env);
- else
- FREE (value_cell (var));
-
- if (value == 0)
- {
- value = (char *)xmalloc (1); /* like do_assignment_internal */
- value[0] = '\0';
- }
-
- var_setvalue (var, value);
- var->attributes |= (att_exported|att_tempvar);
- var->context = variable_context; /* XXX */
-
- INVALIDATE_EXPORTSTR (var);
- var->exportstr = mk_env_string (name, value);
-
- array_needs_making = 1;
-
- if (flags)
- stupidly_hack_special_variables (name);
-
- if (echo_command_at_execute)
- /* The Korn shell prints the `+ ' in front of assignment statements,
- so we do too. */
- xtrace_print_assignment (name, value, 0, 1);
-
- free (name);
- return 1;
-}
-
-/* **************************************************************** */
-/* */
-/* Copying variables */
-/* */
-/* **************************************************************** */
-
-#ifdef INCLUDE_UNUSED
-/* Copy VAR to a new data structure and return that structure. */
-SHELL_VAR *
-copy_variable (var)
- SHELL_VAR *var;
-{
- SHELL_VAR *copy = (SHELL_VAR *)NULL;
-
- if (var)
- {
- copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
-
- copy->attributes = var->attributes;
- copy->name = savestring (var->name);
-
- if (function_p (var))
- var_setfunc (copy, copy_command (function_cell (var)));
-#if defined (ARRAY_VARS)
- else if (array_p (var))
- var_setarray (copy, array_copy (array_cell (var)));
- else if (assoc_p (var))
- var_setassoc (copy, assoc_copy (assoc_cell (var)));
-#endif
- else if (nameref_cell (var)) /* XXX - nameref */
- var_setref (copy, savestring (nameref_cell (var)));
- else if (value_cell (var)) /* XXX - nameref */
- var_setvalue (copy, savestring (value_cell (var)));
- else
- var_setvalue (copy, (char *)NULL);
-
- copy->dynamic_value = var->dynamic_value;
- copy->assign_func = var->assign_func;
-
- copy->exportstr = COPY_EXPORTSTR (var);
-
- copy->context = var->context;
- }
- return (copy);
-}
-#endif
-
-/* **************************************************************** */
-/* */
-/* Deleting and unsetting variables */
-/* */
-/* **************************************************************** */
-
-/* Dispose of the information attached to VAR. */
-static void
-dispose_variable_value (var)
- SHELL_VAR *var;
-{
- if (function_p (var))
- dispose_command (function_cell (var));
-#if defined (ARRAY_VARS)
- else if (array_p (var))
- array_dispose (array_cell (var));
- else if (assoc_p (var))
- assoc_dispose (assoc_cell (var));
-#endif
- else if (nameref_p (var))
- FREE (nameref_cell (var));
- else
- FREE (value_cell (var));
-}
-
-void
-dispose_variable (var)
- SHELL_VAR *var;
-{
- if (var == 0)
- return;
-
- if (nofree_p (var) == 0)
- dispose_variable_value (var);
-
- FREE_EXPORTSTR (var);
-
- free (var->name);
-
- if (exported_p (var))
- array_needs_making = 1;
-
- free (var);
-}
-
-/* Unset the shell variable referenced by NAME. Unsetting a nameref variable
- unsets the variable it resolves to but leaves the nameref alone. */
-int
-unbind_variable (name)
- const char *name;
-{
- SHELL_VAR *v, *nv;
- int r;
-
- v = var_lookup (name, shell_variables);
- nv = (v && nameref_p (v)) ? find_variable_nameref (v) : (SHELL_VAR *)NULL;
-
- r = nv ? makunbound (nv->name, shell_variables) : makunbound (name, shell_variables);
- return r;
-}
-
-/* Unbind NAME, where NAME is assumed to be a nameref variable */
-int
-unbind_nameref (name)
- const char *name;
-{
- SHELL_VAR *v;
-
- v = var_lookup (name, shell_variables);
- if (v && nameref_p (v))
- return makunbound (name, shell_variables);
- return 0;
-}
-
-/* Unset the shell function named NAME. */
-int
-unbind_func (name)
- const char *name;
-{
- BUCKET_CONTENTS *elt;
- SHELL_VAR *func;
-
- elt = hash_remove (name, shell_functions, 0);
-
- if (elt == 0)
- return -1;
-
-#if defined (PROGRAMMABLE_COMPLETION)
- set_itemlist_dirty (&it_functions);
-#endif
-
- func = (SHELL_VAR *)elt->data;
- if (func)
- {
- if (exported_p (func))
- array_needs_making++;
- dispose_variable (func);
- }
-
- free (elt->key);
- free (elt);
-
- return 0;
-}
-
-#if defined (DEBUGGER)
-int
-unbind_function_def (name)
- const char *name;
-{
- BUCKET_CONTENTS *elt;
- FUNCTION_DEF *funcdef;
-
- elt = hash_remove (name, shell_function_defs, 0);
-
- if (elt == 0)
- return -1;
-
- funcdef = (FUNCTION_DEF *)elt->data;
- if (funcdef)
- dispose_function_def (funcdef);
-
- free (elt->key);
- free (elt);
-
- return 0;
-}
-#endif /* DEBUGGER */
-
-int
-delete_var (name, vc)
- const char *name;
- VAR_CONTEXT *vc;
-{
- BUCKET_CONTENTS *elt;
- SHELL_VAR *old_var;
- VAR_CONTEXT *v;
-
- for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
- if (elt = hash_remove (name, v->table, 0))
- break;
-
- if (elt == 0)
- return (-1);
-
- old_var = (SHELL_VAR *)elt->data;
- free (elt->key);
- free (elt);
-
- dispose_variable (old_var);
- return (0);
-}
-
-/* Make the variable associated with NAME go away. HASH_LIST is the
- hash table from which this variable should be deleted (either
- shell_variables or shell_functions).
- Returns non-zero if the variable couldn't be found. */
-int
-makunbound (name, vc)
- const char *name;
- VAR_CONTEXT *vc;
-{
- BUCKET_CONTENTS *elt, *new_elt;
- SHELL_VAR *old_var;
- VAR_CONTEXT *v;
- char *t;
-
- for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
- if (elt = hash_remove (name, v->table, 0))
- break;
-
- if (elt == 0)
- return (-1);
-
- old_var = (SHELL_VAR *)elt->data;
-
- if (old_var && exported_p (old_var))
- array_needs_making++;
-
- /* If we're unsetting a local variable and we're still executing inside
- the function, just mark the variable as invisible. The function
- eventually called by pop_var_context() will clean it up later. This
- must be done so that if the variable is subsequently assigned a new
- value inside the function, the `local' attribute is still present.
- We also need to add it back into the correct hash table. */
- if (old_var && local_p (old_var) && variable_context == old_var->context)
- {
- if (nofree_p (old_var))
- var_setvalue (old_var, (char *)NULL);
-#if defined (ARRAY_VARS)
- else if (array_p (old_var))
- array_dispose (array_cell (old_var));
- else if (assoc_p (old_var))
- assoc_dispose (assoc_cell (old_var));
-#endif
- else if (nameref_p (old_var))
- FREE (nameref_cell (old_var));
- else
- FREE (value_cell (old_var));
- /* Reset the attributes. Preserve the export attribute if the variable
- came from a temporary environment. Make sure it stays local, and
- make it invisible. */
- old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0;
- VSETATTR (old_var, att_local);
- VSETATTR (old_var, att_invisible);
- var_setvalue (old_var, (char *)NULL);
- INVALIDATE_EXPORTSTR (old_var);
-
- new_elt = hash_insert (savestring (old_var->name), v->table, 0);
- new_elt->data = (PTR_T)old_var;
- stupidly_hack_special_variables (old_var->name);
-
- free (elt->key);
- free (elt);
- return (0);
- }
-
- /* Have to save a copy of name here, because it might refer to
- old_var->name. If so, stupidly_hack_special_variables will
- reference freed memory. */
- t = savestring (name);
-
- free (elt->key);
- free (elt);
-
- dispose_variable (old_var);
- stupidly_hack_special_variables (t);
- free (t);
-
- return (0);
-}
-
-/* Get rid of all of the variables in the current context. */
-void
-kill_all_local_variables ()
-{
- VAR_CONTEXT *vc;
-
- for (vc = shell_variables; vc; vc = vc->down)
- if (vc_isfuncenv (vc) && vc->scope == variable_context)
- break;
- if (vc == 0)
- return; /* XXX */
-
- if (vc->table && vc_haslocals (vc))
- {
- delete_all_variables (vc->table);
- hash_dispose (vc->table);
- }
- vc->table = (HASH_TABLE *)NULL;
-}
-
-static void
-free_variable_hash_data (data)
- PTR_T data;
-{
- SHELL_VAR *var;
-
- var = (SHELL_VAR *)data;
- dispose_variable (var);
-}
-
-/* Delete the entire contents of the hash table. */
-void
-delete_all_variables (hashed_vars)
- HASH_TABLE *hashed_vars;
-{
- hash_flush (hashed_vars, free_variable_hash_data);
-}
-
-/* **************************************************************** */
-/* */
-/* Setting variable attributes */
-/* */
-/* **************************************************************** */
-
-#define FIND_OR_MAKE_VARIABLE(name, entry) \
- do \
- { \
- entry = find_variable (name); \
- if (!entry) \
- { \
- entry = bind_variable (name, "", 0); \
- if (!no_invisible_vars && entry) entry->attributes |= att_invisible; \
- } \
- } \
- while (0)
-
-/* Make the variable associated with NAME be readonly.
- If NAME does not exist yet, create it. */
-void
-set_var_read_only (name)
- char *name;
-{
- SHELL_VAR *entry;
-
- FIND_OR_MAKE_VARIABLE (name, entry);
- VSETATTR (entry, att_readonly);
-}
-
-#ifdef INCLUDE_UNUSED
-/* Make the function associated with NAME be readonly.
- If NAME does not exist, we just punt, like auto_export code below. */
-void
-set_func_read_only (name)
- const char *name;
-{
- SHELL_VAR *entry;
-
- entry = find_function (name);
- if (entry)
- VSETATTR (entry, att_readonly);
-}
-
-/* Make the variable associated with NAME be auto-exported.
- If NAME does not exist yet, create it. */
-void
-set_var_auto_export (name)
- char *name;
-{
- SHELL_VAR *entry;
-
- FIND_OR_MAKE_VARIABLE (name, entry);
- set_auto_export (entry);
-}
-
-/* Make the function associated with NAME be auto-exported. */
-void
-set_func_auto_export (name)
- const char *name;
-{
- SHELL_VAR *entry;
-
- entry = find_function (name);
- if (entry)
- set_auto_export (entry);
-}
-#endif
-
-/* **************************************************************** */
-/* */
-/* Creating lists of variables */
-/* */
-/* **************************************************************** */
-
-static VARLIST *
-vlist_alloc (nentries)
- int nentries;
-{
- VARLIST *vlist;
-
- vlist = (VARLIST *)xmalloc (sizeof (VARLIST));
- vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *));
- vlist->list_size = nentries;
- vlist->list_len = 0;
- vlist->list[0] = (SHELL_VAR *)NULL;
-
- return vlist;
-}
-
-static VARLIST *
-vlist_realloc (vlist, n)
- VARLIST *vlist;
- int n;
-{
- if (vlist == 0)
- return (vlist = vlist_alloc (n));
- if (n > vlist->list_size)
- {
- vlist->list_size = n;
- vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *));
- }
- return vlist;
-}
-
-static void
-vlist_add (vlist, var, flags)
- VARLIST *vlist;
- SHELL_VAR *var;
- int flags;
-{
- register int i;
-
- for (i = 0; i < vlist->list_len; i++)
- if (STREQ (var->name, vlist->list[i]->name))
- break;
- if (i < vlist->list_len)
- return;
-
- if (i >= vlist->list_size)
- vlist = vlist_realloc (vlist, vlist->list_size + 16);
-
- vlist->list[vlist->list_len++] = var;
- vlist->list[vlist->list_len] = (SHELL_VAR *)NULL;
-}
-
-/* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the
- variables for which FUNCTION returns a non-zero value. A NULL value
- for FUNCTION means to use all variables. */
-SHELL_VAR **
-map_over (function, vc)
- sh_var_map_func_t *function;
- VAR_CONTEXT *vc;
-{
- VAR_CONTEXT *v;
- VARLIST *vlist;
- SHELL_VAR **ret;
- int nentries;
-
- for (nentries = 0, v = vc; v; v = v->down)
- nentries += HASH_ENTRIES (v->table);
-
- if (nentries == 0)
- return (SHELL_VAR **)NULL;
-
- vlist = vlist_alloc (nentries);
-
- for (v = vc; v; v = v->down)
- flatten (v->table, function, vlist, 0);
-
- ret = vlist->list;
- free (vlist);
- return ret;
-}
-
-SHELL_VAR **
-map_over_funcs (function)
- sh_var_map_func_t *function;
-{
- VARLIST *vlist;
- SHELL_VAR **ret;
-
- if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0)
- return ((SHELL_VAR **)NULL);
-
- vlist = vlist_alloc (HASH_ENTRIES (shell_functions));
-
- flatten (shell_functions, function, vlist, 0);
-
- ret = vlist->list;
- free (vlist);
- return ret;
-}
-
-/* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those
- elements for which FUNC succeeds to VLIST->list. FLAGS is reserved
- for future use. Only unique names are added to VLIST. If FUNC is
- NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is
- NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST
- and FUNC are both NULL, nothing happens. */
-static void
-flatten (var_hash_table, func, vlist, flags)
- HASH_TABLE *var_hash_table;
- sh_var_map_func_t *func;
- VARLIST *vlist;
- int flags;
-{
- register int i;
- register BUCKET_CONTENTS *tlist;
- int r;
- SHELL_VAR *var;
-
- if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0))
- return;
-
- for (i = 0; i < var_hash_table->nbuckets; i++)
- {
- for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next)
- {
- var = (SHELL_VAR *)tlist->data;
-
- r = func ? (*func) (var) : 1;
- if (r && vlist)
- vlist_add (vlist, var, flags);
- }
- }
-}
-
-void
-sort_variables (array)
- SHELL_VAR **array;
-{
- qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp);
-}
-
-static int
-qsort_var_comp (var1, var2)
- SHELL_VAR **var1, **var2;
-{
- int result;
-
- if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0)
- result = strcmp ((*var1)->name, (*var2)->name);
-
- return (result);
-}
-
-/* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for
- which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
-static SHELL_VAR **
-vapply (func)
- sh_var_map_func_t *func;
-{
- SHELL_VAR **list;
-
- list = map_over (func, shell_variables);
- if (list /* && posixly_correct */)
- sort_variables (list);
- return (list);
-}
-
-/* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for
- which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
-static SHELL_VAR **
-fapply (func)
- sh_var_map_func_t *func;
-{
- SHELL_VAR **list;
-
- list = map_over_funcs (func);
- if (list /* && posixly_correct */)
- sort_variables (list);
- return (list);
-}
-
-/* Create a NULL terminated array of all the shell variables. */
-SHELL_VAR **
-all_shell_variables ()
-{
- return (vapply ((sh_var_map_func_t *)NULL));
-}
-
-/* Create a NULL terminated array of all the shell functions. */
-SHELL_VAR **
-all_shell_functions ()
-{
- return (fapply ((sh_var_map_func_t *)NULL));
-}
-
-static int
-visible_var (var)
- SHELL_VAR *var;
-{
- return (invisible_p (var) == 0);
-}
-
-SHELL_VAR **
-all_visible_functions ()
-{
- return (fapply (visible_var));
-}
-
-SHELL_VAR **
-all_visible_variables ()
-{
- return (vapply (visible_var));
-}
-
-/* Return non-zero if the variable VAR is visible and exported. Array
- variables cannot be exported. */
-static int
-visible_and_exported (var)
- SHELL_VAR *var;
-{
- return (invisible_p (var) == 0 && exported_p (var));
-}
-
-/* Candidate variables for the export environment are either valid variables
- with the export attribute or invalid variables inherited from the initial
- environment and simply passed through. */
-static int
-export_environment_candidate (var)
- SHELL_VAR *var;
-{
- return (exported_p (var) && (invisible_p (var) == 0 || imported_p (var)));
-}
-
-/* Return non-zero if VAR is a local variable in the current context and
- is exported. */
-static int
-local_and_exported (var)
- SHELL_VAR *var;
-{
- return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var));
-}
-
-SHELL_VAR **
-all_exported_variables ()
-{
- return (vapply (visible_and_exported));
-}
-
-SHELL_VAR **
-local_exported_variables ()
-{
- return (vapply (local_and_exported));
-}
-
-static int
-variable_in_context (var)
- SHELL_VAR *var;
-{
- return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context);
-}
-
-SHELL_VAR **
-all_local_variables ()
-{
- VARLIST *vlist;
- SHELL_VAR **ret;
- VAR_CONTEXT *vc;
-
- vc = shell_variables;
- for (vc = shell_variables; vc; vc = vc->down)
- if (vc_isfuncenv (vc) && vc->scope == variable_context)
- break;
-
- if (vc == 0)
- {
- internal_error (_("all_local_variables: no function context at current scope"));
- return (SHELL_VAR **)NULL;
- }
- if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0)
- return (SHELL_VAR **)NULL;
-
- vlist = vlist_alloc (HASH_ENTRIES (vc->table));
-
- flatten (vc->table, variable_in_context, vlist, 0);
-
- ret = vlist->list;
- free (vlist);
- if (ret)
- sort_variables (ret);
- return ret;
-}
-
-#if defined (ARRAY_VARS)
-/* Return non-zero if the variable VAR is visible and an array. */
-static int
-visible_array_vars (var)
- SHELL_VAR *var;
-{
- return (invisible_p (var) == 0 && array_p (var));
-}
-
-SHELL_VAR **
-all_array_variables ()
-{
- return (vapply (visible_array_vars));
-}
-#endif /* ARRAY_VARS */
-
-char **
-all_variables_matching_prefix (prefix)
- const char *prefix;
-{
- SHELL_VAR **varlist;
- char **rlist;
- int vind, rind, plen;
-
- plen = STRLEN (prefix);
- varlist = all_visible_variables ();
- for (vind = 0; varlist && varlist[vind]; vind++)
- ;
- if (varlist == 0 || vind == 0)
- return ((char **)NULL);
- rlist = strvec_create (vind + 1);
- for (vind = rind = 0; varlist[vind]; vind++)
- {
- if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen))
- rlist[rind++] = savestring (varlist[vind]->name);
- }
- rlist[rind] = (char *)0;
- free (varlist);
-
- return rlist;
-}
-
-/* **************************************************************** */
-/* */
-/* Managing temporary variable scopes */
-/* */
-/* **************************************************************** */
-
-/* Make variable NAME have VALUE in the temporary environment. */
-static SHELL_VAR *
-bind_tempenv_variable (name, value)
- const char *name;
- char *value;
-{
- SHELL_VAR *var;
-
- var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL;
-
- if (var)
- {
- FREE (value_cell (var));
- var_setvalue (var, savestring (value));
- INVALIDATE_EXPORTSTR (var);
- }
-
- return (var);
-}
-
-/* Find a variable in the temporary environment that is named NAME.
- Return the SHELL_VAR *, or NULL if not found. */
-SHELL_VAR *
-find_tempenv_variable (name)
- const char *name;
-{
- return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL);
-}
-
-char **tempvar_list;
-int tvlist_ind;
-
-/* Push the variable described by (SHELL_VAR *)DATA down to the next
- variable context from the temporary environment. */
-static void
-push_temp_var (data)
- PTR_T data;
-{
- SHELL_VAR *var, *v;
- HASH_TABLE *binding_table;
-
- var = (SHELL_VAR *)data;
-
- binding_table = shell_variables->table;
- if (binding_table == 0)
- {
- if (shell_variables == global_variables)
- /* shouldn't happen */
- binding_table = shell_variables->table = global_variables->table = hash_create (0);
- else
- binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS);
- }
-
- v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0);
-
- /* XXX - should we set the context here? It shouldn't matter because of how
- assign_in_env works, but might want to check. */
- if (binding_table == global_variables->table) /* XXX */
- var->attributes &= ~(att_tempvar|att_propagate);
- else
- {
- var->attributes |= att_propagate;
- if (binding_table == shell_variables->table)
- shell_variables->flags |= VC_HASTMPVAR;
- }
- v->attributes |= var->attributes;
-
- if (find_special_var (var->name) >= 0)
- tempvar_list[tvlist_ind++] = savestring (var->name);
-
- dispose_variable (var);
-}
-
-static void
-propagate_temp_var (data)
- PTR_T data;
-{
- SHELL_VAR *var;
-
- var = (SHELL_VAR *)data;
- if (tempvar_p (var) && (var->attributes & att_propagate))
- push_temp_var (data);
- else
- {
- if (find_special_var (var->name) >= 0)
- tempvar_list[tvlist_ind++] = savestring (var->name);
- dispose_variable (var);
- }
-}
-
-/* Free the storage used in the hash table for temporary
- environment variables. PUSHF is a function to be called
- to free each hash table entry. It takes care of pushing variables
- to previous scopes if appropriate. PUSHF stores names of variables
- that require special handling (e.g., IFS) on tempvar_list, so this
- function can call stupidly_hack_special_variables on all the
- variables in the list when the temporary hash table is destroyed. */
-static void
-dispose_temporary_env (pushf)
- sh_free_func_t *pushf;
-{
- int i;
-
- tempvar_list = strvec_create (HASH_ENTRIES (temporary_env) + 1);
- tempvar_list[tvlist_ind = 0] = 0;
-
- hash_flush (temporary_env, pushf);
- hash_dispose (temporary_env);
- temporary_env = (HASH_TABLE *)NULL;
-
- tempvar_list[tvlist_ind] = 0;
-
- array_needs_making = 1;
-
-#if 0
- sv_ifs ("IFS"); /* XXX here for now -- check setifs in assign_in_env */
-#endif
- for (i = 0; i < tvlist_ind; i++)
- stupidly_hack_special_variables (tempvar_list[i]);
-
- strvec_dispose (tempvar_list);
- tempvar_list = 0;
- tvlist_ind = 0;
-}
-
-void
-dispose_used_env_vars ()
-{
- if (temporary_env)
- {
- dispose_temporary_env (propagate_temp_var);
- maybe_make_export_env ();
- }
-}
-
-/* Take all of the shell variables in the temporary environment HASH_TABLE
- and make shell variables from them at the current variable context. */
-void
-merge_temporary_env ()
-{
- if (temporary_env)
- dispose_temporary_env (push_temp_var);
-}
-
-/* **************************************************************** */
-/* */
-/* Creating and manipulating the environment */
-/* */
-/* **************************************************************** */
-
-static inline char *
-mk_env_string (name, value)
- const char *name, *value;
-{
- int name_len, value_len;
- char *p;
-
- name_len = strlen (name);
- value_len = STRLEN (value);
- p = (char *)xmalloc (2 + name_len + value_len);
- strcpy (p, name);
- p[name_len] = '=';
- if (value && *value)
- strcpy (p + name_len + 1, value);
- else
- p[name_len + 1] = '\0';
- return (p);
-}
-
-#ifdef DEBUG
-/* Debugging */
-static int
-valid_exportstr (v)
- SHELL_VAR *v;
-{
- char *s;
-
- s = v->exportstr;
- if (s == 0)
- {
- internal_error (_("%s has null exportstr"), v->name);
- return (0);
- }
- if (legal_variable_starter ((unsigned char)*s) == 0)
- {
- internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
- return (0);
- }
- for (s = v->exportstr + 1; s && *s; s++)
- {
- if (*s == '=')
- break;
- if (legal_variable_char ((unsigned char)*s) == 0)
- {
- internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
- return (0);
- }
- }
- if (*s != '=')
- {
- internal_error (_("no `=' in exportstr for %s"), v->name);
- return (0);
- }
- return (1);
-}
-#endif
-
-static char **
-make_env_array_from_var_list (vars)
- SHELL_VAR **vars;
-{
- register int i, list_index;
- register SHELL_VAR *var;
- char **list, *value;
-
- list = strvec_create ((1 + strvec_len ((char **)vars)));
-
-#define USE_EXPORTSTR (value == var->exportstr)
-
- for (i = 0, list_index = 0; var = vars[i]; i++)
- {
-#if defined (__CYGWIN__)
- /* We don't use the exportstr stuff on Cygwin at all. */
- INVALIDATE_EXPORTSTR (var);
-#endif
- if (var->exportstr)
- value = var->exportstr;
- else if (function_p (var))
- value = named_function_string ((char *)NULL, function_cell (var), 0);
-#if defined (ARRAY_VARS)
- else if (array_p (var))
-# if ARRAY_EXPORT
- value = array_to_assignment_string (array_cell (var));
-# else
- continue; /* XXX array vars cannot yet be exported */
-# endif /* ARRAY_EXPORT */
- else if (assoc_p (var))
-# if 0
- value = assoc_to_assignment_string (assoc_cell (var));
-# else
- continue; /* XXX associative array vars cannot yet be exported */
-# endif
-#endif
- else
- value = value_cell (var);
-
- if (value)
- {
- /* Gee, I'd like to get away with not using savestring() if we're
- using the cached exportstr... */
- list[list_index] = USE_EXPORTSTR ? savestring (value)
- : mk_env_string (var->name, value);
-
- if (USE_EXPORTSTR == 0)
- SAVE_EXPORTSTR (var, list[list_index]);
-
- list_index++;
-#undef USE_EXPORTSTR
-
-#if 0 /* not yet */
-#if defined (ARRAY_VARS)
- if (array_p (var) || assoc_p (var))
- free (value);
-#endif
-#endif
- }
- }
-
- list[list_index] = (char *)NULL;
- return (list);
-}
-
-/* Make an array of assignment statements from the hash table
- HASHED_VARS which contains SHELL_VARs. Only visible, exported
- variables are eligible. */
-static char **
-make_var_export_array (vcxt)
- VAR_CONTEXT *vcxt;
-{
- char **list;
- SHELL_VAR **vars;
-
-#if 0
- vars = map_over (visible_and_exported, vcxt);
-#else
- vars = map_over (export_environment_candidate, vcxt);
-#endif
-
- if (vars == 0)
- return (char **)NULL;
-
- list = make_env_array_from_var_list (vars);
-
- free (vars);
- return (list);
-}
-
-static char **
-make_func_export_array ()
-{
- char **list;
- SHELL_VAR **vars;
-
- vars = map_over_funcs (visible_and_exported);
- if (vars == 0)
- return (char **)NULL;
-
- list = make_env_array_from_var_list (vars);
-
- free (vars);
- return (list);
-}
-
-/* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */
-#define add_to_export_env(envstr,do_alloc) \
-do \
- { \
- if (export_env_index >= (export_env_size - 1)) \
- { \
- export_env_size += 16; \
- export_env = strvec_resize (export_env, export_env_size); \
- environ = export_env; \
- } \
- export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \
- export_env[export_env_index] = (char *)NULL; \
- } while (0)
-
-/* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the
- array with the same left-hand side. Return the new EXPORT_ENV. */
-char **
-add_or_supercede_exported_var (assign, do_alloc)
- char *assign;
- int do_alloc;
-{
- register int i;
- int equal_offset;
-
- equal_offset = assignment (assign, 0);
- if (equal_offset == 0)
- return (export_env);
-
- /* If this is a function, then only supersede the function definition.
- We do this by including the `=() {' in the comparison, like
- initialize_shell_variables does. */
- if (assign[equal_offset + 1] == '(' &&
- strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */
- equal_offset += 4;
-
- for (i = 0; i < export_env_index; i++)
- {
- if (STREQN (assign, export_env[i], equal_offset + 1))
- {
- free (export_env[i]);
- export_env[i] = do_alloc ? savestring (assign) : assign;
- return (export_env);
- }
- }
- add_to_export_env (assign, do_alloc);
- return (export_env);
-}
-
-static void
-add_temp_array_to_env (temp_array, do_alloc, do_supercede)
- char **temp_array;
- int do_alloc, do_supercede;
-{
- register int i;
-
- if (temp_array == 0)
- return;
-
- for (i = 0; temp_array[i]; i++)
- {
- if (do_supercede)
- export_env = add_or_supercede_exported_var (temp_array[i], do_alloc);
- else
- add_to_export_env (temp_array[i], do_alloc);
- }
-
- free (temp_array);
-}
-
-/* Make the environment array for the command about to be executed, if the
- array needs making. Otherwise, do nothing. If a shell action could
- change the array that commands receive for their environment, then the
- code should `array_needs_making++'.
-
- The order to add to the array is:
- temporary_env
- list of var contexts whose head is shell_variables
- shell_functions
-
- This is the shell variable lookup order. We add only new variable
- names at each step, which allows local variables and variables in
- the temporary environments to shadow variables in the global (or
- any previous) scope.
-*/
-
-static int
-n_shell_variables ()
-{
- VAR_CONTEXT *vc;
- int n;
-
- for (n = 0, vc = shell_variables; vc; vc = vc->down)
- n += HASH_ENTRIES (vc->table);
- return n;
-}
-
-int
-chkexport (name)
- char *name;
-{
- SHELL_VAR *v;
-
- v = find_variable (name);
- if (v && exported_p (v))
- {
- array_needs_making = 1;
- maybe_make_export_env ();
- return 1;
- }
- return 0;
-}
-
-void
-maybe_make_export_env ()
-{
- register char **temp_array;
- int new_size;
- VAR_CONTEXT *tcxt;
-
- if (array_needs_making)
- {
- if (export_env)
- strvec_flush (export_env);
-
- /* Make a guess based on how many shell variables and functions we
- have. Since there will always be array variables, and array
- variables are not (yet) exported, this will always be big enough
- for the exported variables and functions. */
- new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 +
- HASH_ENTRIES (temporary_env);
- if (new_size > export_env_size)
- {
- export_env_size = new_size;
- export_env = strvec_resize (export_env, export_env_size);
- environ = export_env;
- }
- export_env[export_env_index = 0] = (char *)NULL;
-
- /* Make a dummy variable context from the temporary_env, stick it on
- the front of shell_variables, call make_var_export_array on the
- whole thing to flatten it, and convert the list of SHELL_VAR *s
- to the form needed by the environment. */
- if (temporary_env)
- {
- tcxt = new_var_context ((char *)NULL, 0);
- tcxt->table = temporary_env;
- tcxt->down = shell_variables;
- }
- else
- tcxt = shell_variables;
-
- temp_array = make_var_export_array (tcxt);
- if (temp_array)
- add_temp_array_to_env (temp_array, 0, 0);
-
- if (tcxt != shell_variables)
- free (tcxt);
-
-#if defined (RESTRICTED_SHELL)
- /* Restricted shells may not export shell functions. */
- temp_array = restricted ? (char **)0 : make_func_export_array ();
-#else
- temp_array = make_func_export_array ();
-#endif
- if (temp_array)
- add_temp_array_to_env (temp_array, 0, 0);
-
- array_needs_making = 0;
- }
-}
-
-/* This is an efficiency hack. PWD and OLDPWD are auto-exported, so
- we will need to remake the exported environment every time we
- change directories. `_' is always put into the environment for
- every external command, so without special treatment it will always
- cause the environment to be remade.
-
- If there is no other reason to make the exported environment, we can
- just update the variables in place and mark the exported environment
- as no longer needing a remake. */
-void
-update_export_env_inplace (env_prefix, preflen, value)
- char *env_prefix;
- int preflen;
- char *value;
-{
- char *evar;
-
- evar = (char *)xmalloc (STRLEN (value) + preflen + 1);
- strcpy (evar, env_prefix);
- if (value)
- strcpy (evar + preflen, value);
- export_env = add_or_supercede_exported_var (evar, 0);
-}
-
-/* We always put _ in the environment as the name of this command. */
-void
-put_command_name_into_env (command_name)
- char *command_name;
-{
- update_export_env_inplace ("_=", 2, command_name);
-}
-
-/* **************************************************************** */
-/* */
-/* Managing variable contexts */
-/* */
-/* **************************************************************** */
-
-/* Allocate and return a new variable context with NAME and FLAGS.
- NAME can be NULL. */
-
-VAR_CONTEXT *
-new_var_context (name, flags)
- char *name;
- int flags;
-{
- VAR_CONTEXT *vc;
-
- vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT));
- vc->name = name ? savestring (name) : (char *)NULL;
- vc->scope = variable_context;
- vc->flags = flags;
-
- vc->up = vc->down = (VAR_CONTEXT *)NULL;
- vc->table = (HASH_TABLE *)NULL;
-
- return vc;
-}
-
-/* Free a variable context and its data, including the hash table. Dispose
- all of the variables. */
-void
-dispose_var_context (vc)
- VAR_CONTEXT *vc;
-{
- FREE (vc->name);
-
- if (vc->table)
- {
- delete_all_variables (vc->table);
- hash_dispose (vc->table);
- }
-
- free (vc);
-}
-
-/* Set VAR's scope level to the current variable context. */
-static int
-set_context (var)
- SHELL_VAR *var;
-{
- return (var->context = variable_context);
-}
-
-/* Make a new variable context with NAME and FLAGS and a HASH_TABLE of
- temporary variables, and push it onto shell_variables. This is
- for shell functions. */
-VAR_CONTEXT *
-push_var_context (name, flags, tempvars)
- char *name;
- int flags;
- HASH_TABLE *tempvars;
-{
- VAR_CONTEXT *vc;
-
- vc = new_var_context (name, flags);
- vc->table = tempvars;
- if (tempvars)
- {
- /* Have to do this because the temp environment was created before
- variable_context was incremented. */
- flatten (tempvars, set_context, (VARLIST *)NULL, 0);
- vc->flags |= VC_HASTMPVAR;
- }
- vc->down = shell_variables;
- shell_variables->up = vc;
-
- return (shell_variables = vc);
-}
-
-static void
-push_func_var (data)
- PTR_T data;
-{
- SHELL_VAR *var, *v;
-
- var = (SHELL_VAR *)data;
-
- if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate)))
- {
- /* Make sure we have a hash table to store the variable in while it is
- being propagated down to the global variables table. Create one if
- we have to */
- if ((vc_isfuncenv (shell_variables) || vc_istempenv (shell_variables)) && shell_variables->table == 0)
- shell_variables->table = hash_create (0);
- /* XXX - should we set v->context here? */
- v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
- if (shell_variables == global_variables)
- var->attributes &= ~(att_tempvar|att_propagate);
- else
- shell_variables->flags |= VC_HASTMPVAR;
- v->attributes |= var->attributes;
- }
- else
- stupidly_hack_special_variables (var->name); /* XXX */
-
- dispose_variable (var);
-}
-
-/* Pop the top context off of VCXT and dispose of it, returning the rest of
- the stack. */
-void
-pop_var_context ()
-{
- VAR_CONTEXT *ret, *vcxt;
-
- vcxt = shell_variables;
- if (vc_isfuncenv (vcxt) == 0)
- {
- internal_error (_("pop_var_context: head of shell_variables not a function context"));
- return;
- }
-
- if (ret = vcxt->down)
- {
- ret->up = (VAR_CONTEXT *)NULL;
- shell_variables = ret;
- if (vcxt->table)
- hash_flush (vcxt->table, push_func_var);
- dispose_var_context (vcxt);
- }
- else
- internal_error (_("pop_var_context: no global_variables context"));
-}
-
-/* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and
- all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */
-void
-delete_all_contexts (vcxt)
- VAR_CONTEXT *vcxt;
-{
- VAR_CONTEXT *v, *t;
-
- for (v = vcxt; v != global_variables; v = t)
- {
- t = v->down;
- dispose_var_context (v);
- }
-
- delete_all_variables (global_variables->table);
- shell_variables = global_variables;
-}
-
-/* **************************************************************** */
-/* */
-/* Pushing and Popping temporary variable scopes */
-/* */
-/* **************************************************************** */
-
-VAR_CONTEXT *
-push_scope (flags, tmpvars)
- int flags;
- HASH_TABLE *tmpvars;
-{
- return (push_var_context ((char *)NULL, flags, tmpvars));
-}
-
-static void
-push_exported_var (data)
- PTR_T data;
-{
- SHELL_VAR *var, *v;
-
- var = (SHELL_VAR *)data;
-
- /* If a temp var had its export attribute set, or it's marked to be
- propagated, bind it in the previous scope before disposing it. */
- /* XXX - This isn't exactly right, because all tempenv variables have the
- export attribute set. */
-#if 0
- if (exported_p (var) || (var->attributes & att_propagate))
-#else
- if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate))
-#endif
- {
- var->attributes &= ~att_tempvar; /* XXX */
- v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
- if (shell_variables == global_variables)
- var->attributes &= ~att_propagate;
- v->attributes |= var->attributes;
- }
- else
- stupidly_hack_special_variables (var->name); /* XXX */
-
- dispose_variable (var);
-}
-
-void
-pop_scope (is_special)
- int is_special;
-{
- VAR_CONTEXT *vcxt, *ret;
-
- vcxt = shell_variables;
- if (vc_istempscope (vcxt) == 0)
- {
- internal_error (_("pop_scope: head of shell_variables not a temporary environment scope"));
- return;
- }
-
- ret = vcxt->down;
- if (ret)
- ret->up = (VAR_CONTEXT *)NULL;
-
- shell_variables = ret;
-
- /* Now we can take care of merging variables in VCXT into set of scopes
- whose head is RET (shell_variables). */
- FREE (vcxt->name);
- if (vcxt->table)
- {
- if (is_special)
- hash_flush (vcxt->table, push_func_var);
- else
- hash_flush (vcxt->table, push_exported_var);
- hash_dispose (vcxt->table);
- }
- free (vcxt);
-
- sv_ifs ("IFS"); /* XXX here for now */
-}
-
-/* **************************************************************** */
-/* */
-/* Pushing and Popping function contexts */
-/* */
-/* **************************************************************** */
-
-static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL;
-static int dollar_arg_stack_slots;
-static int dollar_arg_stack_index;
-
-/* XXX - we might want to consider pushing and popping the `getopts' state
- when we modify the positional parameters. */
-void
-push_context (name, is_subshell, tempvars)
- char *name; /* function name */
- int is_subshell;
- HASH_TABLE *tempvars;
-{
- if (is_subshell == 0)
- push_dollar_vars ();
- variable_context++;
- push_var_context (name, VC_FUNCENV, tempvars);
-}
-
-/* Only called when subshell == 0, so we don't need to check, and can
- unconditionally pop the dollar vars off the stack. */
-void
-pop_context ()
-{
- pop_dollar_vars ();
- variable_context--;
- pop_var_context ();
-
- sv_ifs ("IFS"); /* XXX here for now */
-}
-
-/* Save the existing positional parameters on a stack. */
-void
-push_dollar_vars ()
-{
- if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots)
- {
- dollar_arg_stack = (WORD_LIST **)
- xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10)
- * sizeof (WORD_LIST *));
- }
- dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args ();
- dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
-}
-
-/* Restore the positional parameters from our stack. */
-void
-pop_dollar_vars ()
-{
- if (!dollar_arg_stack || dollar_arg_stack_index == 0)
- return;
-
- remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1);
- dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
- dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
- set_dollar_vars_unchanged ();
-}
-
-void
-dispose_saved_dollar_vars ()
-{
- if (!dollar_arg_stack || dollar_arg_stack_index == 0)
- return;
-
- dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
- dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
-}
-
-/* Manipulate the special BASH_ARGV and BASH_ARGC variables. */
-
-void
-push_args (list)
- WORD_LIST *list;
-{
-#if defined (ARRAY_VARS) && defined (DEBUGGER)
- SHELL_VAR *bash_argv_v, *bash_argc_v;
- ARRAY *bash_argv_a, *bash_argc_a;
- WORD_LIST *l;
- arrayind_t i;
- char *t;
-
- GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
- GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
-
- for (l = list, i = 0; l; l = l->next, i++)
- array_push (bash_argv_a, l->word->word);
-
- t = itos (i);
- array_push (bash_argc_a, t);
- free (t);
-#endif /* ARRAY_VARS && DEBUGGER */
-}
-
-/* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC
- array and use that value as the count of elements to remove from
- BASH_ARGV. */
-void
-pop_args ()
-{
-#if defined (ARRAY_VARS) && defined (DEBUGGER)
- SHELL_VAR *bash_argv_v, *bash_argc_v;
- ARRAY *bash_argv_a, *bash_argc_a;
- ARRAY_ELEMENT *ce;
- intmax_t i;
-
- GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
- GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
-
- ce = array_shift (bash_argc_a, 1, 0);
- if (ce == 0 || legal_number (element_value (ce), &i) == 0)
- i = 0;
-
- for ( ; i > 0; i--)
- array_pop (bash_argv_a);
- array_dispose_element (ce);
-#endif /* ARRAY_VARS && DEBUGGER */
-}
-
-/*************************************************
- * *
- * Functions to manage special variables *
- * *
- *************************************************/
-
-/* Extern declarations for variables this code has to manage. */
-extern int eof_encountered, eof_encountered_limit, ignoreeof;
-
-#if defined (READLINE)
-extern int hostname_list_initialized;
-#endif
-
-/* An alist of name.function for each special variable. Most of the
- functions don't do much, and in fact, this would be faster with a
- switch statement, but by the end of this file, I am sick of switch
- statements. */
-
-#define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0
-
-/* This table will be sorted with qsort() the first time it's accessed. */
-struct name_and_function {
- char *name;
- sh_sv_func_t *function;
-};
-
-static struct name_and_function special_vars[] = {
- { "BASH_COMPAT", sv_shcompat },
- { "BASH_XTRACEFD", sv_xtracefd },
-
-#if defined (JOB_CONTROL)
- { "CHILD_MAX", sv_childmax },
-#endif
-
-#if defined (READLINE)
-# if defined (STRICT_POSIX)
- { "COLUMNS", sv_winsize },
-# endif
- { "COMP_WORDBREAKS", sv_comp_wordbreaks },
-#endif
-
- { "FUNCNEST", sv_funcnest },
-
- { "GLOBIGNORE", sv_globignore },
-
-#if defined (HISTORY)
- { "HISTCONTROL", sv_history_control },
- { "HISTFILESIZE", sv_histsize },
- { "HISTIGNORE", sv_histignore },
- { "HISTSIZE", sv_histsize },
- { "HISTTIMEFORMAT", sv_histtimefmt },
-#endif
-
-#if defined (__CYGWIN__)
- { "HOME", sv_home },
-#endif
-
-#if defined (READLINE)
- { "HOSTFILE", sv_hostfile },
-#endif
-
- { "IFS", sv_ifs },
- { "IGNOREEOF", sv_ignoreeof },
-
- { "LANG", sv_locale },
- { "LC_ALL", sv_locale },
- { "LC_COLLATE", sv_locale },
- { "LC_CTYPE", sv_locale },
- { "LC_MESSAGES", sv_locale },
- { "LC_NUMERIC", sv_locale },
- { "LC_TIME", sv_locale },
-
-#if defined (READLINE) && defined (STRICT_POSIX)
- { "LINES", sv_winsize },
-#endif
-
- { "MAIL", sv_mail },
- { "MAILCHECK", sv_mail },
- { "MAILPATH", sv_mail },
-
- { "OPTERR", sv_opterr },
- { "OPTIND", sv_optind },
-
- { "PATH", sv_path },
- { "POSIXLY_CORRECT", sv_strict_posix },
-
-#if defined (READLINE)
- { "TERM", sv_terminal },
- { "TERMCAP", sv_terminal },
- { "TERMINFO", sv_terminal },
-#endif /* READLINE */
-
- { "TEXTDOMAIN", sv_locale },
- { "TEXTDOMAINDIR", sv_locale },
-
-#if defined (HAVE_TZSET)
- { "TZ", sv_tz },
-#endif
-
-#if defined (HISTORY) && defined (BANG_HISTORY)
- { "histchars", sv_histchars },
-#endif /* HISTORY && BANG_HISTORY */
-
- { "ignoreeof", sv_ignoreeof },
-
- { (char *)0, (sh_sv_func_t *)0 }
-};
-
-#define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1)
-
-static int
-sv_compare (sv1, sv2)
- struct name_and_function *sv1, *sv2;
-{
- int r;
-
- if ((r = sv1->name[0] - sv2->name[0]) == 0)
- r = strcmp (sv1->name, sv2->name);
- return r;
-}
-
-static inline int
-find_special_var (name)
- const char *name;
-{
- register int i, r;
-
- for (i = 0; special_vars[i].name; i++)
- {
- r = special_vars[i].name[0] - name[0];
- if (r == 0)
- r = strcmp (special_vars[i].name, name);
- if (r == 0)
- return i;
- else if (r > 0)
- /* Can't match any of rest of elements in sorted list. Take this out
- if it causes problems in certain environments. */
- break;
- }
- return -1;
-}
-
-/* The variable in NAME has just had its state changed. Check to see if it
- is one of the special ones where something special happens. */
-void
-stupidly_hack_special_variables (name)
- char *name;
-{
- static int sv_sorted = 0;
- int i;
-
- if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */
- {
- qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]),
- (QSFUNC *)sv_compare);
- sv_sorted = 1;
- }
-
- i = find_special_var (name);
- if (i != -1)
- (*(special_vars[i].function)) (name);
-}
-
-/* Special variables that need hooks to be run when they are unset as part
- of shell reinitialization should have their sv_ functions run here. */
-void
-reinit_special_variables ()
-{
-#if defined (READLINE)
- sv_comp_wordbreaks ("COMP_WORDBREAKS");
-#endif
- sv_globignore ("GLOBIGNORE");
- sv_opterr ("OPTERR");
-}
-
-void
-sv_ifs (name)
- char *name;
-{
- SHELL_VAR *v;
-
- v = find_variable ("IFS");
- setifs (v);
-}
-
-/* What to do just after the PATH variable has changed. */
-void
-sv_path (name)
- char *name;
-{
- /* hash -r */
- phash_flush ();
-}
-
-/* What to do just after one of the MAILxxxx variables has changed. NAME
- is the name of the variable. This is called with NAME set to one of
- MAIL, MAILCHECK, or MAILPATH. */
-void
-sv_mail (name)
- char *name;
-{
- /* If the time interval for checking the files has changed, then
- reset the mail timer. Otherwise, one of the pathname vars
- to the users mailbox has changed, so rebuild the array of
- filenames. */
- if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */
- reset_mail_timer ();
- else
- {
- free_mail_files ();
- remember_mail_dates ();
- }
-}
-
-void
-sv_funcnest (name)
- char *name;
-{
- SHELL_VAR *v;
- intmax_t num;
-
- v = find_variable (name);
- if (v == 0)
- funcnest_max = 0;
- else if (legal_number (value_cell (v), &num) == 0)
- funcnest_max = 0;
- else
- funcnest_max = num;
-}
-
-/* What to do when GLOBIGNORE changes. */
-void
-sv_globignore (name)
- char *name;
-{
- if (privileged_mode == 0)
- setup_glob_ignore (name);
-}
-
-#if defined (READLINE)
-void
-sv_comp_wordbreaks (name)
- char *name;
-{
- SHELL_VAR *sv;
-
- sv = find_variable (name);
- if (sv == 0)
- reset_completer_word_break_chars ();
-}
-
-/* What to do just after one of the TERMxxx variables has changed.
- If we are an interactive shell, then try to reset the terminal
- information in readline. */
-void
-sv_terminal (name)
- char *name;
-{
- if (interactive_shell && no_line_editing == 0)
- rl_reset_terminal (get_string_value ("TERM"));
-}
-
-void
-sv_hostfile (name)
- char *name;
-{
- SHELL_VAR *v;
-
- v = find_variable (name);
- if (v == 0)
- clear_hostname_list ();
- else
- hostname_list_initialized = 0;
-}
-
-#if defined (STRICT_POSIX)
-/* In strict posix mode, we allow assignments to LINES and COLUMNS (and values
- found in the initial environment) to override the terminal size reported by
- the kernel. */
-void
-sv_winsize (name)
- char *name;
-{
- SHELL_VAR *v;
- intmax_t xd;
- int d;
-
- if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing)
- return;
-
- v = find_variable (name);
- if (v == 0 || var_isnull (v))
- rl_reset_screen_size ();
- else
- {
- if (legal_number (value_cell (v), &xd) == 0)
- return;
- winsize_assignment = 1;
- d = xd; /* truncate */
- if (name[0] == 'L') /* LINES */
- rl_set_screen_size (d, -1);
- else /* COLUMNS */
- rl_set_screen_size (-1, d);
- winsize_assignment = 0;
- }
-}
-#endif /* STRICT_POSIX */
-#endif /* READLINE */
-
-/* Update the value of HOME in the export environment so tilde expansion will
- work on cygwin. */
-#if defined (__CYGWIN__)
-sv_home (name)
- char *name;
-{
- array_needs_making = 1;
- maybe_make_export_env ();
-}
-#endif
-
-#if defined (HISTORY)
-/* What to do after the HISTSIZE or HISTFILESIZE variables change.
- If there is a value for this HISTSIZE (and it is numeric), then stifle
- the history. Otherwise, if there is NO value for this variable,
- unstifle the history. If name is HISTFILESIZE, and its value is
- numeric, truncate the history file to hold no more than that many
- lines. */
-void
-sv_histsize (name)
- char *name;
-{
- char *temp;
- intmax_t num;
- int hmax;
-
- temp = get_string_value (name);
-
- if (temp && *temp)
- {
- if (legal_number (temp, &num))
- {
- hmax = num;
- if (hmax < 0 && name[4] == 'S')
- unstifle_history (); /* unstifle history if HISTSIZE < 0 */
- else if (name[4] == 'S')
- {
- stifle_history (hmax);
- hmax = where_history ();
- if (history_lines_this_session > hmax)
- history_lines_this_session = hmax;
- }
- else if (hmax >= 0) /* truncate HISTFILE if HISTFILESIZE >= 0 */
- {
- history_truncate_file (get_string_value ("HISTFILE"), hmax);
- if (hmax <= history_lines_in_file)
- history_lines_in_file = hmax;
- }
- }
- }
- else if (name[4] == 'S')
- unstifle_history ();
-}
-
-/* What to do after the HISTIGNORE variable changes. */
-void
-sv_histignore (name)
- char *name;
-{
- setup_history_ignore (name);
-}
-
-/* What to do after the HISTCONTROL variable changes. */
-void
-sv_history_control (name)
- char *name;
-{
- char *temp;
- char *val;
- int tptr;
-
- history_control = 0;
- temp = get_string_value (name);
-
- if (temp == 0 || *temp == 0)
- return;
-
- tptr = 0;
- while (val = extract_colon_unit (temp, &tptr))
- {
- if (STREQ (val, "ignorespace"))
- history_control |= HC_IGNSPACE;
- else if (STREQ (val, "ignoredups"))
- history_control |= HC_IGNDUPS;
- else if (STREQ (val, "ignoreboth"))
- history_control |= HC_IGNBOTH;
- else if (STREQ (val, "erasedups"))
- history_control |= HC_ERASEDUPS;
-
- free (val);
- }
-}
-
-#if defined (BANG_HISTORY)
-/* Setting/unsetting of the history expansion character. */
-void
-sv_histchars (name)
- char *name;
-{
- char *temp;
-
- temp = get_string_value (name);
- if (temp)
- {
- history_expansion_char = *temp;
- if (temp[0] && temp[1])
- {
- history_subst_char = temp[1];
- if (temp[2])
- history_comment_char = temp[2];
- }
- }
- else
- {
- history_expansion_char = '!';
- history_subst_char = '^';
- history_comment_char = '#';
- }
-}
-#endif /* BANG_HISTORY */
-
-void
-sv_histtimefmt (name)
- char *name;
-{
- SHELL_VAR *v;
-
- if (v = find_variable (name))
- {
- if (history_comment_char == 0)
- history_comment_char = '#';
- }
- history_write_timestamps = (v != 0);
-}
-#endif /* HISTORY */
-
-#if defined (HAVE_TZSET)
-void
-sv_tz (name)
- char *name;
-{
- if (chkexport (name))
- tzset ();
-}
-#endif
-
-/* If the variable exists, then the value of it can be the number
- of times we actually ignore the EOF. The default is small,
- (smaller than csh, anyway). */
-void
-sv_ignoreeof (name)
- char *name;
-{
- SHELL_VAR *tmp_var;
- char *temp;
-
- eof_encountered = 0;
-
- tmp_var = find_variable (name);
- ignoreeof = tmp_var != 0;
- temp = tmp_var ? value_cell (tmp_var) : (char *)NULL;
- if (temp)
- eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10;
- set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */
-}
-
-void
-sv_optind (name)
- char *name;
-{
- char *tt;
- int s;
-
- tt = get_string_value ("OPTIND");
- if (tt && *tt)
- {
- s = atoi (tt);
-
- /* According to POSIX, setting OPTIND=1 resets the internal state
- of getopt (). */
- if (s < 0 || s == 1)
- s = 0;
- }
- else
- s = 0;
- getopts_reset (s);
-}
-
-void
-sv_opterr (name)
- char *name;
-{
- char *tt;
-
- tt = get_string_value ("OPTERR");
- sh_opterr = (tt && *tt) ? atoi (tt) : 1;
-}
-
-void
-sv_strict_posix (name)
- char *name;
-{
- SET_INT_VAR (name, posixly_correct);
- posix_initialize (posixly_correct);
-#if defined (READLINE)
- if (interactive_shell)
- posix_readline_initialize (posixly_correct);
-#endif /* READLINE */
- set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */
-}
-
-void
-sv_locale (name)
- char *name;
-{
- char *v;
- int r;
-
- v = get_string_value (name);
- if (name[0] == 'L' && name[1] == 'A') /* LANG */
- r = set_lang (name, v);
- else
- r = set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */
-
-#if 1
- if (r == 0 && posixly_correct)
- last_command_exit_value = 1;
-#endif
-}
-
-#if defined (ARRAY_VARS)
-void
-set_pipestatus_array (ps, nproc)
- int *ps;
- int nproc;
-{
- SHELL_VAR *v;
- ARRAY *a;
- ARRAY_ELEMENT *ae;
- register int i;
- char *t, tbuf[INT_STRLEN_BOUND(int) + 1];
-
- v = find_variable ("PIPESTATUS");
- if (v == 0)
- v = make_new_array_variable ("PIPESTATUS");
- if (array_p (v) == 0)
- return; /* Do nothing if not an array variable. */
- a = array_cell (v);
-
- if (a == 0 || array_num_elements (a) == 0)
- {
- for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */
- {
- t = inttostr (ps[i], tbuf, sizeof (tbuf));
- array_insert (a, i, t);
- }
- return;
- }
-
- /* Fast case */
- if (array_num_elements (a) == nproc && nproc == 1)
- {
- ae = element_forw (a->head);
- free (element_value (ae));
- ae->value = itos (ps[0]);
- }
- else if (array_num_elements (a) <= nproc)
- {
- /* modify in array_num_elements members in place, then add */
- ae = a->head;
- for (i = 0; i < array_num_elements (a); i++)
- {
- ae = element_forw (ae);
- free (element_value (ae));
- ae->value = itos (ps[i]);
- }
- /* add any more */
- for ( ; i < nproc; i++)
- {
- t = inttostr (ps[i], tbuf, sizeof (tbuf));
- array_insert (a, i, t);
- }
- }
- else
- {
- /* deleting elements. it's faster to rebuild the array. */
- array_flush (a);
- for (i = 0; ps[i] != -1; i++)
- {
- t = inttostr (ps[i], tbuf, sizeof (tbuf));
- array_insert (a, i, t);
- }
- }
-}
-
-ARRAY *
-save_pipestatus_array ()
-{
- SHELL_VAR *v;
- ARRAY *a, *a2;
-
- v = find_variable ("PIPESTATUS");
- if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
- return ((ARRAY *)NULL);
-
- a = array_cell (v);
- a2 = array_copy (array_cell (v));
-
- return a2;
-}
-
-void
-restore_pipestatus_array (a)
- ARRAY *a;
-{
- SHELL_VAR *v;
- ARRAY *a2;
-
- v = find_variable ("PIPESTATUS");
- /* XXX - should we still assign even if existing value is NULL? */
- if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
- return;
-
- a2 = array_cell (v);
- var_setarray (v, a);
-
- array_dispose (a2);
-}
-#endif
-
-void
-set_pipestatus_from_exit (s)
- int s;
-{
-#if defined (ARRAY_VARS)
- static int v[2] = { 0, -1 };
-
- v[0] = s;
- set_pipestatus_array (v, 1);
-#endif
-}
-
-void
-sv_xtracefd (name)
- char *name;
-{
- SHELL_VAR *v;
- char *t, *e;
- int fd;
- FILE *fp;
-
- v = find_variable (name);
- if (v == 0)
- {
- xtrace_reset ();
- return;
- }
-
- t = value_cell (v);
- if (t == 0 || *t == 0)
- xtrace_reset ();
- else
- {
- fd = (int)strtol (t, &e, 10);
- if (e != t && *e == '\0' && sh_validfd (fd))
- {
- fp = fdopen (fd, "w");
- if (fp == 0)
- internal_error (_("%s: %s: cannot open as FILE"), name, value_cell (v));
- else
- xtrace_set (fd, fp);
- }
- else
- internal_error (_("%s: %s: invalid value for trace file descriptor"), name, value_cell (v));
- }
-}
-
-#define MIN_COMPAT_LEVEL 31
-
-void
-sv_shcompat (name)
- char *name;
-{
- SHELL_VAR *v;
- char *val;
- int tens, ones, compatval;
-
- v = find_variable (name);
- if (v == 0)
- {
- shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
- set_compatibility_opts ();
- return;
- }
- val = value_cell (v);
- if (val == 0 || *val == '\0')
- {
- shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
- set_compatibility_opts ();
- return;
- }
- /* Handle decimal-like compatibility version specifications: 4.2 */
- if (isdigit (val[0]) && val[1] == '.' && isdigit (val[2]) && val[3] == 0)
- {
- tens = val[0] - '0';
- ones = val[2] - '0';
- compatval = tens*10 + ones;
- }
- /* Handle integer-like compatibility version specifications: 42 */
- else if (isdigit (val[0]) && isdigit (val[1]) && val[2] == 0)
- {
- tens = val[0] - '0';
- ones = val[1] - '0';
- compatval = tens*10 + ones;
- }
- else
- {
-compat_error:
- internal_error (_("%s: %s: compatibility value out of range"), name, val);
- shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
- set_compatibility_opts ();
- return;
- }
-
- if (compatval < MIN_COMPAT_LEVEL || compatval > DEFAULT_COMPAT_LEVEL)
- goto compat_error;
-
- shell_compatibility_level = compatval;
- set_compatibility_opts ();
-}
-
-#if defined (JOB_CONTROL)
-void
-sv_childmax (name)
- char *name;
-{
- char *tt;
- int s;
-
- tt = get_string_value (name);
- s = (tt && *tt) ? atoi (tt) : 0;
- set_maxchild (s);
-}
-#endif
projects / thirdparty / bash.git / commitdiff
