examples/misc/cshtobash

   1 #! /bin/bash
   2 #
   3 # cshtobash - convert csh aliases, environment variables, and variables to
   4 #             bash equivalents
   5 #
   6 # usage: cshtobash [filename]
   7 #
   8 # If filename is given, that file is sourced.  Note that csh always
   9 # sources .cshrc.  To recreate your csh login environment, run
  10 # `cshtobash ~/.login'.
  11 #
  12 # Inspired by (and some borrowed from) a similar program distributed with
  13 # zsh-3.0.
  14 #
  15 # Chet Ramey
  16 # chet@po.cwru.edu
  17 #
  18 trap 'rm -f $TMPFILE1 $TMPFILEa $TMPFILEe $TMPFILEv $TMPFILEco $TMPFILEci' 0 1 2 3 6 15
  19
  20 { TMPFILE1=$(mktemp -t cb.1.XXXXXX) &&
  21   TMPFILEa=$(mktemp -t cb.a.XXXXXX) &&
  22   TMPFILEe=$(mktemp -t cb.e.XXXXXX) &&
  23   TMPFILEv=$(mktemp -t cb.v.XXXXXX) &&
  24   TMPFILEco=$(mktemp -t cshout.XXXXXX) &&
  25   TMPFILEci=$(mktemp -t cshin.XXXXXX)
  26 } || exit 1
  27
  28
  29 T=$'\t'
  30
  31 SOURCE="${1:+source $1}"
  32
  33 cat << EOF >$TMPFILEci
  34 $SOURCE
  35 alias >! $TMPFILEa
  36 setenv >! $TMPFILEe
  37 set >! $TMPFILEv
  38 EOF
  39
  40 # give csh a minimal environment, similar to what login would provide
  41 /usr/bin/env - USER=$USER HOME=$HOME PATH=/usr/bin:/bin:/usr/ucb:. TERM=$TERM SHELL=$SHELL /bin/csh -i < $TMPFILEci > $TMPFILEco 2>&1
  42
  43 # First convert aliases
  44
  45 cat << \EOF >$TMPFILE1
  46 mkalias ()
  47 {
  48         case $2 in
  49         '')     echo alias ${1}="''" ;;
  50         *[#\!]*)
  51                 comm=$(echo $2 | sed  's/\!\*/"$\@"/g
  52                                        s/\!:\([1-9]\)/"$\1"/g
  53                                        s/#/\#/g')
  54                 echo $1 \(\) "{" command "$comm"  "; }"
  55                 ;;
  56         *)      echo alias ${1}=\'$(echo "${2}" | sed "s:':'\\\\'':")\' ;;
  57         esac
  58 }
  59 EOF
  60
  61 sed "s/^\([a-zA-Z0-9_]*\)$T\(.*\)$/mkalias \1 '\2'/" < $TMPFILEa >>$TMPFILE1
  62
  63 echo '# csh aliases'
  64 echo
  65
  66 $BASH $TMPFILE1 | sed -e 's/\$cwd/\$PWD/g' \
  67                    -e 's/\$term/\$TERM/g' \
  68                    -e 's/\$home/\$HOME/g' \
  69                    -e 's/\$user/\$USER/g' \
  70                    -e 's/\$prompt/\$PS1/g'
  71
  72 # Next, convert environment variables
  73 echo
  74 echo '# csh environment variables'
  75 echo
  76
  77 # Would be nice to deal with embedded newlines, e.g. in TERMCAP, but ...
  78 sed -e '/^SHLVL/d' \
  79     -e '/^PWD/d' \
  80     -e "s/'/'"\\\\"''"/g \
  81     -e "s/^\([A-Za-z0-9_]*=\)/export \1'/" \
  82     -e "s/$/'/" < $TMPFILEe
  83
  84 # Finally, convert local variables
  85 echo
  86 echo '# csh variables'
  87 echo
  88
  89 sed -e 's/'"$T"'/=/' \
  90     -e "s/'/'"\\\\"''"/g \
  91     -e '/^[A-Za-z0-9_]*=[^(]/{
  92         s/=/='"'/"'
  93         s/$/'"'/"'
  94         }' < $TMPFILEv |
  95 sed -e '/^argv=/d' -e '/^cwd=/d' -e '/^filec=/d' -e '/^status=/d' \
  96          -e '/^verbose=/d' \
  97          -e '/^term=/d' \
  98          -e '/^home=/d' \
  99          -e '/^path=/d' \
 100          -e '/^user=/d' \
 101          -e '/^shell=/d' \
 102          -e '/^cdpath=/d' \
 103          -e '/^mail=/d' \
 104          -e '/^home=/s//HOME=/' \
 105          -e '/^prompt=/s//PS1=/' \
 106          -e '/^histfile=/s//HISTFILE=/' \
 107          -e '/^history=/s//HISTSIZE=/' \
 108          -e '/^savehist=$/s//HISTFILESIZE=${HISTSIZE-500}/' \
 109          -e '/^savehist=/s//HISTFILESIZE=/' \
 110          -e '/^ignoreeof=$/s/^.*$/set -o ignoreeof # ignoreeof/' \
 111          -e '/^ignoreeof=/s//IGNOREEOF=/' \
 112          -e '/^noclobber=/s/^.*$/set -C # noclobber/' \
 113          -e '/^notify=/s/^.*$/set -b # notify/' \
 114          -e '/^noglob=/s/^.*$/set -f # noglob/' \
 115
 116
 117 # now some special csh variables converted to bash equivalents
 118 echo
 119 echo '# special csh variables converted to bash equivalents'
 120 echo
 121
 122 sed -e 's/'"$T"'/=/' < $TMPFILEv |
 123 grep "^cdpath=" |
 124 sed 's/(//
 125      s/ /:/g
 126      s/)//
 127      s/cdpath=/CDPATH=/'
 128
 129
 130 sed -e 's/'"$T"'/=/' < $TMPFILEv |
 131 grep "^mail=" |
 132 sed 's/(//
 133      s/ /:/g
 134      s/)//
 135      s/mail=/MAILPATH=/' |
 136 sed -e 's/MAILPATH=\([0-9][0-9][^:]*\)$/MAILCHECK=\1/' \
 137     -e 's/MAILPATH=\([0-9][0-9][^:]*\):\(.*\)/MAILCHECK=\1 MAILPATH=\2/'
 138
 139 exit 0