zforce.in

   1 #!/bin/sh
   2 # zforce: force a gz extension on all gzip files so that gzip will not
   3 # compress them twice.
   4 #
   5 # This can be useful for files with names truncated after a file transfer.
   6 # 12345678901234 is renamed to 12345678901.gz
   7
   8
   9 # Copyright (C) 2002, 2007, 2010-2024 Free Software Foundation, Inc.
  10 # Copyright (C) 1993 Jean-loup Gailly
  11
  12 # This program is free software; you can redistribute it and/or modify
  13 # it under the terms of the GNU General Public License as published by
  14 # the Free Software Foundation; either version 3 of the License, or
  15 # (at your option) any later version.
  16
  17 # This program is distributed in the hope that it will be useful,
  18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 # GNU General Public License for more details.
  21
  22 # You should have received a copy of the GNU General Public License
  23 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  24
  25 version="zforce (gzip) @VERSION@
  26 Copyright (C) 2024 Free Software Foundation, Inc.
  27 This is free software.  You may redistribute copies of it under the terms of
  28 the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
  29 There is NO WARRANTY, to the extent permitted by law.
  30
  31 Written by Jean-loup Gailly."
  32
  33 usage="Usage: $0 [FILE]...
  34 Force a .gz extension on all compressed FILEs so that gzip will
  35 not compress them twice.
  36
  37 Report bugs to <bug-gzip@gnu.org>."
  38
  39 if test $# = 0; then
  40   printf >&2 '%s\n' "$0: invalid number of operands; try \`$0 --help' for help"
  41   exit 1
  42 fi
  43
  44 res=0
  45 for i do
  46   case "$i" in
  47   --h*) printf '%s\n' "$usage"   || exit 1; exit;;
  48   --v*) printf '%s\n' "$version" || exit 1; exit;;
  49   *[-.]z | *[-.]gz | *.t[ag]z) continue;;
  50   esac
  51
  52   if test ! -f "$i" ; then
  53     printf '%s\n' "zforce: $i not a file"
  54     res=1
  55     continue
  56   fi
  57
  58   if 'gzip' -lv < "$i" 2>/dev/null | grep '^defl' > /dev/null; then
  59
  60     new="$i.gz"
  61     mv "$i" "$new" && printf '%s\n' "$i -- replaced with $new" || res=1
  62   fi
  63 done
  64 exit $res