Gzip 1.1

[unix-history] / gnu / usr.bin / gzip / zcmp

#!/bin/sh

# Zcmp and zdiff are used to invoke the cmp or the  diff  pro-
# gram  on compressed files.  All options specified are passed
# directly to cmp or diff.  If only 1 file is specified,  then
# the  files  compared  are file1 and an uncompressed file1.gz.
# If two files are specified, then they are  uncompressed  (if
# necessary) and fed to cmp or diff.  The exit status from cmp
# or diff is preserved.

prog=`echo $0 | sed 's|.*/||'`
case "$prog" in
 *cmp) comp=${CMP-cmp}   ;;
 *)    comp=${DIFF-diff} ;;
esac

OPTIONS=
FILES=
for ARG
do
   case "$ARG" in
   -*) OPTIONS="$OPTIONS $ARG";;
    *) if test -f "$ARG"; then
           FILES="$FILES $ARG"
       else
           echo "${prog}: $ARG not found or not a regular file"
           exit 1
       fi ;;
   esac
done
if test -z "$FILES"; then
       echo "Usage: $prog [${comp}_options] file [file]"
       exit 1
fi
set $FILES
if test $# -eq 1; then
       FILE=`echo "$1" | sed 's/[-.][zZtga]*$//'`
       gzip -cd "$1" | $comp $OPTIONS - "$FILE"
       STAT="$?"

elif test $# -eq 2; then
       case "$1" in
       *[-.]gz | *[-.][zZ] | *.t[ga]z)
               case "$2" in
               *[-.]gz | *[-.][zZ] | *.t[ga]z)
                       F=`echo "$2" | sed 's|.*/||;s|[-.][zZtga]*$||'`
                       gzip -cd "$2" > /tmp/"$F".$$
                       gzip -cd "$1" | $comp $OPTIONS - /tmp/"$F".$$
                       STAT="$?"
                       /bin/rm -f /tmp/"$F".$$;;

               *)      gzip -cd "$1" | $comp $OPTIONS - "$2"
                       STAT="$?";;
               esac;;
       *)      case "$2" in
               *[-.]gz | *[-.][zZ] | *.t[ga]z)
                       gzip -cd "$2" | $comp $OPTIONS "$1" -
                       STAT="$?";;
               *)      $comp $OPTIONS "$1" "$2"
                       STAT="$?";;
               esac;;
       esac
       exit "$STAT"
else
       echo "Usage: $prog [${comp}_options] file [file]"
       exit 1
fi