bzdiff

   1 #!/bin/sh
   2 # sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh
   3
   4 # Bzcmp/diff wrapped for bzip2,
   5 # adapted from zdiff by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.
   6
   7 # Bzcmp and bzdiff are used to invoke the cmp or the  diff  pro-
   8 # gram  on compressed files.  All options specified are passed
   9 # directly to cmp or diff.  If only 1 file is specified,  then
  10 # the  files  compared  are file1 and an uncompressed file1.gz.
  11 # If two files are specified, then they are  uncompressed  (if
  12 # necessary) and fed to cmp or diff.  The exit status from cmp
  13 # or diff is preserved.
  14
  15 PATH="/usr/bin:/bin:$PATH"; export PATH
  16 prog=`echo $0 | sed 's|.*/||'`
  17 case "$prog" in
  18   *cmp) comp=${CMP-cmp}   ;;
  19   *)    comp=${DIFF-diff} ;;
  20 esac
  21
  22 OPTIONS=
  23 FILES=
  24 for ARG
  25 do
  26     case "$ARG" in
  27     -*) OPTIONS="$OPTIONS $ARG";;
  28      *) if test -f "$ARG"; then
  29             FILES="$FILES $ARG"
  30         else
  31             echo "${prog}: $ARG not found or not a regular file"
  32             exit 1
  33         fi ;;
  34     esac
  35 done
  36 if test -z "$FILES"; then
  37         echo "Usage: $prog [${comp}_options] file [file]"
  38         exit 1
  39 fi
  40 set $FILES
  41 if test $# -eq 1; then
  42         FILE=`echo "$1" | sed 's/.bz2$//'`
  43         bzip2 -cd "$FILE.bz2" | $comp $OPTIONS - "$FILE"
  44         STAT="$?"
  45
  46 elif test $# -eq 2; then
  47         case "$1" in
  48         *.bz2)
  49                 case "$2" in
  50                 *.bz2)
  51                         F=`echo "$2" | sed 's|.*/||;s|.bz2$||'`
  52                         tmp=`mktemp "${TMPDIR:-/tmp}"/bzdiff.XXXXXXXXXX` || {
  53                               echo 'cannot create a temporary file' >&2
  54                               exit 1
  55                         }
  56                         bzip2 -cdfq "$2" > "$tmp"
  57                         bzip2 -cdfq "$1" | $comp $OPTIONS - "$tmp"
  58                         STAT="$?"
  59                         /bin/rm -f "$tmp";;
  60
  61                 *)      bzip2 -cdfq "$1" | $comp $OPTIONS - "$2"
  62                         STAT="$?";;
  63                 esac;;
  64         *)      case "$2" in
  65                 *.bz2)
  66                         bzip2 -cdfq "$2" | $comp $OPTIONS "$1" -
  67                         STAT="$?";;
  68                 *)      $comp $OPTIONS "$1" "$2"
  69                         STAT="$?";;
  70                 esac;;
  71         esac
  72 else
  73         echo "Usage: $prog [${comp}_options] file [file]"
  74         exit 1
  75 fi
  76 exit "$STAT"