2014-10-17 Marc Glisse <marc.glisse@inria.fr>
[official-gcc.git] / move-if-change
blobe7ba25e3127c458890bc5a900d44ed43931ff023
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.
5 VERSION='2011-01-28 20:09'; # 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.
11 # Copyright (C) 2002-2007, 2009-2011 Free Software Foundation, Inc.
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.
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.
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/>.
26 usage="usage: $0 SOURCE DEST"
28 help="$usage
29 or: $0 OPTION
30 If SOURCE is different than DEST, then move it to DEST; else remove SOURCE.
32 --help display this help and exit
33 --version output version information and exit
35 The variable CMPPROG can be used to specify an alternative to \`cmp'.
37 Report bugs to <bug-gnulib@gnu.org>."
39 version=`expr "$VERSION" : '\([^ ]*\)'`
40 version="move-if-change (gnulib) $version
41 Copyright (C) 2011 Free Software Foundation, Inc.
42 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
43 This is free software: you are free to change and redistribute it.
44 There is NO WARRANTY, to the extent permitted by law."
46 cmpprog=${CMPPROG-cmp}
48 for arg
50 case $arg in
51 --help | --hel | --he | --h)
52 exec echo "$help" ;;
53 --version | --versio | --versi | --vers | --ver | --ve | --v)
54 exec echo "$version" ;;
55 --)
56 shift
57 break ;;
58 -*)
59 echo "$0: invalid option: $arg" >&2
60 exit 1 ;;
62 break ;;
63 esac
64 done
66 test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; }
68 if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then
69 rm -f -- "$1"
70 else
71 if mv -f -- "$1" "$2"; then :; else
72 # Ignore failure due to a concurrent move-if-change.
73 test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null && rm -f -- "$1"
77 ## Local Variables:
78 ## eval: (add-hook 'write-file-hooks 'time-stamp)
79 ## time-stamp-start: "VERSION='"
80 ## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
81 ## time-stamp-time-zone: "UTC"
82 ## time-stamp-end: "'; # UTC"
83 ## End: