#!/bin/sh # zforce: force a gz extension on all gzip files so that gzip will not # compress them twice. # # This can be useful for files with names truncated after a file transfer. # 12345678901234 is renamed to 12345678901.gz # Copyright (C) 2002, 2007, 2010-2018 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. version="zforce (gzip) 1.10 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 [FILE]... Force a .gz extension on all compressed FILEs so that gzip will not compress them twice. Report bugs to <bug-gzip@gnu.org>." if test $# = 0; then printf >&2 '%s\n' "$0: invalid number of operands; try \`$0 --help' for help" exit 1 fi res=0 for i do case "$i" in --h*) printf '%s\n' "$usage" || exit 1; exit;; --v*) printf '%s\n' "$version" || exit 1; exit;; *[-.]z | *[-.]gz | *.t[ag]z) continue;; esac if test ! -f "$i" ; then printf '%s\n' "zforce: $i not a file" res=1 continue fi if gzip -lv < "$i" 2>/dev/null | grep '^defl' > /dev/null; then new="$i.gz" mv "$i" "$new" && printf '%s\n' "$i -- replaced with $new" || res=1 fi done exit $res