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252b5132 | 1 | #!/bin/sh |
2016dfcc BE |
2 | # Like mv $1 $2, but if the files are the same, just delete $1. |
3 | # Status is zero if successful, nonzero otherwise. | |
252b5132 | 4 | |
37e77caf | 5 | VERSION='2012-01-06 07:23'; # UTC |
dcb5e506 RW |
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. | |
252b5132 | 10 | |
37e77caf | 11 | # Copyright (C) 2002-2014 Free Software Foundation, Inc. |
2016dfcc | 12 | |
dcb5e506 RW |
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: $0 OPTION | |
30 | If SOURCE is different than DEST, then move it to DEST; else remove SOURCE. | |
31 | ||
32 | --help display this help and exit | |
33 | --version output version information and exit | |
34 | ||
37e77caf | 35 | The variable CMPPROG can be used to specify an alternative to 'cmp'. |
dcb5e506 RW |
36 | |
37 | Report bugs to <bug-gnulib@gnu.org>." | |
38 | ||
39 | version=`expr "$VERSION" : '\([^ ]*\)'` | |
40 | version="move-if-change (gnulib) $version | |
41 | Copyright (C) 2011 Free Software Foundation, Inc. | |
42 | License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> | |
43 | This is free software: you are free to change and redistribute it. | |
44 | There is NO WARRANTY, to the extent permitted by law." | |
45 | ||
46 | cmpprog=${CMPPROG-cmp} | |
47 | ||
48 | for arg | |
49 | do | |
2016dfcc | 50 | case $arg in |
dcb5e506 RW |
51 | --help | --hel | --he | --h) |
52 | exec echo "$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 ;; | |
61 | *) | |
62 | break ;; | |
2016dfcc BE |
63 | esac |
64 | done | |
65 | ||
dcb5e506 RW |
66 | test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; } |
67 | ||
68 | if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then | |
69 | rm -f -- "$1" | |
252b5132 | 70 | else |
dcb5e506 RW |
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" | |
74 | fi | |
252b5132 | 75 | fi |
dcb5e506 RW |
76 | |
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: |