#!/bin/sh
# Copyright (C) 1998, 2002, 2004, 2007, 2010-2022 Free Software Foundation,
# Inc.
# Copyright (C) 1993 Jean-loup Gailly
# This program 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.
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
LC_ALL=C
export LC_ALL
version="znew (gzip) 1.12
Copyright (C) 2010-2018 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of
the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
Written by Jean-loup Gailly."
usage="Usage: $0 [OPTION]... [FILE]...
Recompress files from .Z (compress) format to .gz (gzip) format.
Options:
-f Force recompression even if a .gz file already exists.
-t Test the new files before deleting originals.
-v Verbose; display name and statistics for each file compressed.
-9 Use the slowest compression method (optimal compression).
-P Use pipes for the conversion to reduce disk space usage.
-K Keep a .Z file when it is smaller than the .gz file; implies -t.
--help display this help and exit
--version output version information and exit
Report bugs to <bug-gzip@gnu.org>."
check=0
pipe=0
opt=
files=
keep=0
res=0
old=0
new=0
block=1024
# block is the disk block size (best guess, need not be exact)
# Beware -s or --suffix in $GZIP.
unset GZIP
ext=.gz
for arg
do
case "$arg" in
--help) printf '%s\n' "$usage" || exit 1; exit;;
--version) printf '%s\n' "$version" || exit 1; exit;;
-*) opt="$opt $arg"; shift;;
*) break;;
esac
done
if test $# -eq 0; then
echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
exit 1
fi
opt=`printf '%s\n' "$opt" | sed -e 's/ //g' -e 's/-//g'`
case "$opt" in
*t*) check=1; opt=`printf '%s\n' "$opt" | sed 's/t//g'`
esac
case "$opt" in
*K*) keep=1; check=1; opt=`printf '%s\n' "$opt" | sed 's/K//g'`
esac
case "$opt" in
*P*) pipe=1; opt=`printf '%s\n' "$opt" | sed 's/P//g'`
esac
if test -n "$opt"; then
opt="-$opt"
fi
for i do
n=`printf '%s\n' "$i" | sed 's/.Z$//'`
if test ! -f "$n.Z" ; then
printf '%s\n' "$n.Z not found"
res=1; continue
fi
test $keep -eq 1 && old=`wc -c < "$n.Z"`
if test $pipe -eq 1; then
if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then
# Copy file attributes from old file to new one, if possible.
touch -r"$n.Z" -- "$n$ext" 2>/dev/null
chmod --reference="$n.Z" -- "$n$ext" 2>/dev/null
else
printf '%s\n' "error while recompressing $n.Z"
res=1; continue
fi
else
if test $check -eq 1; then
if cp -p "$n.Z" "$n.$$"; then
:
else
printf '%s\n' "cannot backup $n.Z"
res=1; continue
fi
fi
if gzip -d "$n.Z"; then
:
else
test $check -eq 1 && mv "$n.$$" "$n.Z"
printf '%s\n' "error while uncompressing $n.Z"
res=1; continue
fi
if gzip $opt "$n"; then
:
else
if test $check -eq 1; then
mv "$n.$$" "$n.Z" && rm -f "$n"
printf '%s\n' "error while recompressing $n"
else
# compress $n (might be dangerous if disk full)
printf '%s\n' "error while recompressing $n, left uncompressed"
fi
res=1; continue
fi
fi
test $keep -eq 1 && new=`wc -c < "$n$ext"`
if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \
`expr \( $new + $block - 1 \) / $block`; then
if test $pipe -eq 1; then
rm -f "$n$ext"
else
mv "$n.$$" "$n.Z" && rm -f "$n$ext"
fi
printf '%s\n' "$n.Z smaller than $n$ext -- unchanged"
elif test $check -eq 1; then
if gzip -t "$n$ext" ; then
rm -f "$n.$$" "$n.Z"
else
test $pipe -eq 0 && mv "$n.$$" "$n.Z"
rm -f "$n$ext"
printf '%s\n' "error while testing $n$ext, $n.Z unchanged"
res=1; continue
fi
elif test $pipe -eq 1; then
rm -f "$n.Z"
fi
done
exit $res
Mini Shell