Initial class construction
This commit is contained in:
João Narciso
157
Git/usr/bin/znew
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157
Git/usr/bin/znew
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#!/bin/sh
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# Copyright (C) 1998, 2002, 2004, 2007, 2010-2018 Free Software Foundation,
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# Inc.
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# Copyright (C) 1993 Jean-loup Gailly
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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version="znew (gzip) 1.10
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Copyright (C) 2010-2018 Free Software Foundation, Inc.
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This is free software. You may redistribute copies of it under the terms of
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the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
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There is NO WARRANTY, to the extent permitted by law.
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Written by Jean-loup Gailly."
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usage="Usage: $0 [OPTION]... [FILE]...
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Recompress files from .Z (compress) format to .gz (gzip) format.
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Options:
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-f Force recompression even if a .gz file already exists.
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-t Test the new files before deleting originals.
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-v Verbose; display name and statistics for each file compressed.
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-9 Use the slowest compression method (optimal compression).
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-P Use pipes for the conversion to reduce disk space usage.
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-K Keep a .Z file when it is smaller than the .gz file; implies -t.
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--help display this help and exit
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--version output version information and exit
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Report bugs to <bug-gzip@gnu.org>."
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check=0
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pipe=0
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opt=
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files=
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keep=0
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res=0
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old=0
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new=0
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block=1024
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# block is the disk block size (best guess, need not be exact)
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# Beware -s or --suffix in $GZIP.
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unset GZIP
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ext=.gz
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for arg
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do
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case "$arg" in
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--help) printf '%s\n' "$usage" || exit 1; exit;;
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--version) printf '%s\n' "$version" || exit 1; exit;;
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-*) opt="$opt $arg"; shift;;
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*) break;;
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esac
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done
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if test $# -eq 0; then
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echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
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exit 1
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fi
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opt=`printf '%s\n' "$opt" | sed -e 's/ //g' -e 's/-//g'`
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case "$opt" in
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*t*) check=1; opt=`printf '%s\n' "$opt" | sed 's/t//g'`
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esac
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case "$opt" in
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*K*) keep=1; check=1; opt=`printf '%s\n' "$opt" | sed 's/K//g'`
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esac
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case "$opt" in
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*P*) pipe=1; opt=`printf '%s\n' "$opt" | sed 's/P//g'`
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esac
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if test -n "$opt"; then
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opt="-$opt"
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fi
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for i do
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n=`printf '%s\n' "$i" | sed 's/.Z$//'`
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if test ! -f "$n.Z" ; then
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printf '%s\n' "$n.Z not found"
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res=1; continue
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fi
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test $keep -eq 1 && old=`wc -c < "$n.Z"`
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if test $pipe -eq 1; then
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if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then
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# Copy file attributes from old file to new one, if possible.
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touch -r"$n.Z" -- "$n$ext" 2>/dev/null
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chmod --reference="$n.Z" -- "$n$ext" 2>/dev/null
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else
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printf '%s\n' "error while recompressing $n.Z"
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res=1; continue
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fi
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else
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if test $check -eq 1; then
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if cp -p "$n.Z" "$n.$$"; then
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:
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else
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printf '%s\n' "cannot backup $n.Z"
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res=1; continue
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fi
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fi
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if gzip -d "$n.Z"; then
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:
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else
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test $check -eq 1 && mv "$n.$$" "$n.Z"
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printf '%s\n' "error while uncompressing $n.Z"
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res=1; continue
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fi
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if gzip $opt "$n"; then
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:
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else
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if test $check -eq 1; then
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mv "$n.$$" "$n.Z" && rm -f "$n"
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printf '%s\n' "error while recompressing $n"
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else
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# compress $n (might be dangerous if disk full)
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printf '%s\n' "error while recompressing $n, left uncompressed"
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fi
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res=1; continue
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fi
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fi
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test $keep -eq 1 && new=`wc -c < "$n$ext"`
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if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \
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`expr \( $new + $block - 1 \) / $block`; then
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if test $pipe -eq 1; then
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rm -f "$n$ext"
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else
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mv "$n.$$" "$n.Z" && rm -f "$n$ext"
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fi
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printf '%s\n' "$n.Z smaller than $n$ext -- unchanged"
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elif test $check -eq 1; then
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if gzip -t "$n$ext" ; then
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rm -f "$n.$$" "$n.Z"
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else
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test $pipe -eq 0 && mv "$n.$$" "$n.Z"
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rm -f "$n$ext"
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printf '%s\n' "error while testing $n$ext, $n.Z unchanged"
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res=1; continue
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fi
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elif test $pipe -eq 1; then
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rm -f "$n.Z"
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fi
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done
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exit $res
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