move-if-change revision 1.3
1 1.1 mrg #!/bin/sh 2 1.1 mrg # Like mv $1 $2, but if the files are the same, just delete $1. 3 1.1 mrg # Status is zero if successful, nonzero otherwise. 4 1.1 mrg 5 1.3 mrg VERSION='2011-01-28 20:09'; # UTC 6 1.3 mrg # The definition above must lie within the first 8 lines in order 7 1.3 mrg # for the Emacs time-stamp write hook (at end) to update it. 8 1.3 mrg # If you change this file with Emacs, please let the write hook 9 1.3 mrg # do its job. Otherwise, update this string manually. 10 1.1 mrg 11 1.3 mrg # Copyright (C) 2002-2007, 2009-2011 Free Software Foundation, Inc. 12 1.1 mrg 13 1.3 mrg # This program is free software: you can redistribute it and/or modify 14 1.3 mrg # it under the terms of the GNU General Public License as published by 15 1.3 mrg # the Free Software Foundation, either version 3 of the License, or 16 1.3 mrg # (at your option) any later version. 17 1.3 mrg 18 1.3 mrg # This program is distributed in the hope that it will be useful, 19 1.3 mrg # but WITHOUT ANY WARRANTY; without even the implied warranty of 20 1.3 mrg # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 1.3 mrg # GNU General Public License for more details. 22 1.3 mrg 23 1.3 mrg # You should have received a copy of the GNU General Public License 24 1.3 mrg # along with this program. If not, see <http://www.gnu.org/licenses/>. 25 1.3 mrg 26 1.3 mrg usage="usage: $0 SOURCE DEST" 27 1.3 mrg 28 1.3 mrg help="$usage 29 1.3 mrg or: $0 OPTION 30 1.3 mrg If SOURCE is different than DEST, then move it to DEST; else remove SOURCE. 31 1.3 mrg 32 1.3 mrg --help display this help and exit 33 1.3 mrg --version output version information and exit 34 1.3 mrg 35 1.3 mrg The variable CMPPROG can be used to specify an alternative to \`cmp'. 36 1.3 mrg 37 1.3 mrg Report bugs to <bug-gnulib (at] gnu.org>." 38 1.3 mrg 39 1.3 mrg version=`expr "$VERSION" : '\([^ ]*\)'` 40 1.3 mrg version="move-if-change (gnulib) $version 41 1.3 mrg Copyright (C) 2011 Free Software Foundation, Inc. 42 1.3 mrg License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 43 1.3 mrg This is free software: you are free to change and redistribute it. 44 1.3 mrg There is NO WARRANTY, to the extent permitted by law." 45 1.3 mrg 46 1.3 mrg cmpprog=${CMPPROG-cmp} 47 1.3 mrg 48 1.3 mrg for arg 49 1.3 mrg do 50 1.1 mrg case $arg in 51 1.3 mrg --help | --hel | --he | --h) 52 1.3 mrg exec echo "$help" ;; 53 1.3 mrg --version | --versio | --versi | --vers | --ver | --ve | --v) 54 1.3 mrg exec echo "$version" ;; 55 1.3 mrg --) 56 1.3 mrg shift 57 1.3 mrg break ;; 58 1.3 mrg -*) 59 1.3 mrg echo "$0: invalid option: $arg" >&2 60 1.3 mrg exit 1 ;; 61 1.3 mrg *) 62 1.3 mrg break ;; 63 1.1 mrg esac 64 1.1 mrg done 65 1.1 mrg 66 1.3 mrg test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; } 67 1.3 mrg 68 1.3 mrg if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then 69 1.3 mrg rm -f -- "$1" 70 1.1 mrg else 71 1.3 mrg if mv -f -- "$1" "$2"; then :; else 72 1.3 mrg # Ignore failure due to a concurrent move-if-change. 73 1.3 mrg test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null && rm -f -- "$1" 74 1.3 mrg fi 75 1.1 mrg fi 76 1.3 mrg 77 1.3 mrg ## Local Variables: 78 1.3 mrg ## eval: (add-hook 'write-file-hooks 'time-stamp) 79 1.3 mrg ## time-stamp-start: "VERSION='" 80 1.3 mrg ## time-stamp-format: "%:y-%02m-%02d %02H:%02M" 81 1.3 mrg ## time-stamp-time-zone: "UTC" 82 1.3 mrg ## time-stamp-end: "'; # UTC" 83 1.3 mrg ## End: 84
Indexes created Tue May 26 00:24:38 UTC 2026