builtins/test.def

   1 This file is test.def, from which is created test.c.
   2 It implements the builtin "test" in Bash.
   3
   4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
   5
   6 This file is part of GNU Bash, the Bourne Again SHell.
   7
   8 Bash is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License along
  19 with Bash; see the file COPYING.  If not, write to the Free Software
  20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
  21
  22 $PRODUCES test.c
  23
  24 $BUILTIN test
  25 $FUNCTION test_builtin
  26 $SHORT_DOC test [expr]
  27 Exits with a status of 0 (trueness) or 1 (falseness) depending on
  28 the evaluation of EXPR.  Expressions may be unary or binary.  Unary
  29 expressions are often used to examine the status of a file.  There
  30 are string operators as well, and numeric comparison operators.
  31
  32 File operators:
  33
  34     -a FILE        True if file exists.
  35     -b FILE        True if file is block special.
  36     -c FILE        True if file is character special.
  37     -d FILE        True if file is a directory.
  38     -e FILE        True if file exists.
  39     -f FILE        True if file exists and is a regular file.
  40     -g FILE        True if file is set-group-id.
  41     -h FILE        True if file is a symbolic link.
  42     -L FILE        True if file is a symbolic link.
  43     -k FILE        True if file has its `sticky' bit set.
  44     -p FILE        True if file is a named pipe.
  45     -r FILE        True if file is readable by you.
  46     -s FILE        True if file exists and is not empty.
  47     -S FILE        True if file is a socket.
  48     -t FD          True if FD is opened on a terminal.
  49     -u FILE        True if the file is set-user-id.
  50     -w FILE        True if the file is writable by you.
  51     -x FILE        True if the file is executable by you.
  52     -O FILE        True if the file is effectively owned by you.
  53     -G FILE        True if the file is effectively owned by your group.
  54     -N FILE        True if the file has been modified since it was last read.
  55
  56   FILE1 -nt FILE2  True if file1 is newer than file2 (according to
  57                    modification date).
  58
  59   FILE1 -ot FILE2  True if file1 is older than file2.
  60
  61   FILE1 -ef FILE2  True if file1 is a hard link to file2.
  62
  63 String operators:
  64
  65     -z STRING      True if string is empty.
  66
  67     -n STRING
  68     STRING         True if string is not empty.
  69
  70     STRING1 = STRING2
  71                    True if the strings are equal.
  72     STRING1 != STRING2
  73                    True if the strings are not equal.
  74     STRING1 < STRING2
  75                    True if STRING1 sorts before STRING2 lexicographically.
  76     STRING1 > STRING2
  77                    True if STRING1 sorts after STRING2 lexicographically.
  78
  79 Other operators:
  80
  81     -o OPTION      True if the shell option OPTION is enabled.
  82     ! EXPR         True if expr is false.
  83     EXPR1 -a EXPR2 True if both expr1 AND expr2 are true.
  84     EXPR1 -o EXPR2 True if either expr1 OR expr2 is true.
  85
  86     arg1 OP arg2   Arithmetic tests.  OP is one of -eq, -ne,
  87                    -lt, -le, -gt, or -ge.
  88
  89 Arithmetic binary operators return true if ARG1 is equal, not-equal,
  90 less-than, less-than-or-equal, greater-than, or greater-than-or-equal
  91 than ARG2.
  92 $END
  93
  94 $BUILTIN [
  95 $DOCNAME test_bracket
  96 $FUNCTION test_builtin
  97 $SHORT_DOC [ arg... ]
  98 This is a synonym for the "test" builtin, but the last
  99 argument must be a literal `]', to match the opening `['.
 100 $END
 101
 102 #include <config.h>
 103
 104 #if defined (HAVE_UNISTD_H)
 105 #  ifdef _MINIX
 106 #    include <sys/types.h>
 107 #  endif
 108 #  include <unistd.h>
 109 #endif
 110
 111 #include "../bashansi.h"
 112
 113 #include "../shell.h"
 114 #include "../test.h"
 115 #include "common.h"
 116
 117 extern char *this_command_name;
 118
 119 /* TEST/[ builtin. */
 120 int
 121 test_builtin (list)
 122      WORD_LIST *list;
 123 {
 124   char **argv;
 125   int argc, result;
 126
 127   /* We let Matthew Bradburn and Kevin Braunsdorf's code do the
 128      actual test command.  So turn the list of args into an array
 129      of strings, since that is what their code wants. */
 130   if (list == 0)
 131     {
 132       if (this_command_name[0] == '[' && !this_command_name[1])
 133         {
 134           builtin_error ("missing `]'");
 135           return (EX_BADUSAGE);
 136         }
 137
 138       return (EXECUTION_FAILURE);
 139     }
 140
 141   argv = make_builtin_argv  (list, &argc);
 142   result = test_command (argc, argv);
 143   free ((char *)argv);
 144
 145   return (result);
 146 }