move-if-change

   1 #!/bin/sh
   2 # Like mv $1 $2, but if the files are the same, just delete $1.
   3 # Status is zero if successful, nonzero otherwise.
   4
   5 VERSION='2007-09-28 23:10'; # UTC
   6 # The definition above must lie within the first 8 lines in order
   7 # for the Emacs time-stamp write hook (at end) to update it.
   8 # If you change this file with Emacs, please let the write hook
   9 # do its job.  Otherwise, update this string manually.
  10
  11 # Copyright (C) 2002-2007, 2009-2011 Free Software Foundation, Inc.
  12
  13 # This program is free software: you can redistribute it and/or modify
  14 # it under the terms of the GNU General Public License as published by
  15 # the Free Software Foundation, either version 3 of the License, or
  16 # (at your option) any later version.
  17
  18 # This program is distributed in the hope that it will be useful,
  19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 # GNU General Public License for more details.
  22
  23 # You should have received a copy of the GNU General Public License
  24 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 usage="usage: $0 SOURCE DEST"
  27
  28 help="$usage
  29   or:  $0 OPTION
  30 If SOURCE is different than DEST, then move it to DEST; else remove SOURCE.
  31
  32   --help     display this help and exit
  33   --version  output version information and exit
  34
  35 Report bugs to <bug-gnulib@gnu.org>."
  36
  37 version=`expr "$VERSION" : '\([^ ]*\)'`
  38 version="move-if-change (gnulib) $version
  39 Copyright (C) 2007 Free Software Foundation, Inc.
  40 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  41 This is free software: you are free to change and redistribute it.
  42 There is NO WARRANTY, to the extent permitted by law."
  43
  44
  45 for arg
  46 do
  47   case $arg in
  48     --help | --hel | --he | --h)
  49       exec echo "$help" ;;
  50     --version | --versio | --versi | --vers | --ver | --ve | --v)
  51       exec echo "$version" ;;
  52     --)
  53       shift
  54       break ;;
  55     -*)
  56       echo "$0: invalid option: $arg" >&2
  57       exit 1 ;;
  58     *)
  59       break ;;
  60   esac
  61 done
  62
  63 test $# = 2 || { echo "$0: $usage" >&2; exit 1; }
  64
  65 if test -r "$2" && cmp -s -- "$1" "$2"; then
  66   rm -f -- "$1"
  67 else
  68   mv -f -- "$1" "$2"
  69 fi
  70
  71 ## Local Variables:
  72 ## eval: (add-hook 'write-file-hooks 'time-stamp)
  73 ## time-stamp-start: "VERSION='"
  74 ## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
  75 ## time-stamp-time-zone: "UTC"
  76 ## time-stamp-end: "'; # UTC"
  77 ## End: