#!/bin/sh
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#!/bin/sh
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# Like mv $1 $2, but if the files are the same, just delete $1.
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# Like mv $1 $2, but if the files are the same, just delete $1.
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# Status is zero if successful, nonzero otherwise.
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# Status is zero if successful, nonzero otherwise.
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VERSION='2011-01-28 20:09'; # UTC
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VERSION='2011-01-28 20:09'; # UTC
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# The definition above must lie within the first 8 lines in order
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# The definition above must lie within the first 8 lines in order
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# for the Emacs time-stamp write hook (at end) to update it.
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# for the Emacs time-stamp write hook (at end) to update it.
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# If you change this file with Emacs, please let the write hook
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# If you change this file with Emacs, please let the write hook
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# do its job. Otherwise, update this string manually.
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# do its job. Otherwise, update this string manually.
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# Copyright (C) 2002-2007, 2009-2011 Free Software Foundation, Inc.
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# Copyright (C) 2002-2007, 2009-2011 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see .
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# along with this program. If not, see .
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usage="usage: $0 SOURCE DEST"
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usage="usage: $0 SOURCE DEST"
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help="$usage
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help="$usage
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or: $0 OPTION
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or: $0 OPTION
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If SOURCE is different than DEST, then move it to DEST; else remove SOURCE.
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If SOURCE is different than DEST, then move it to DEST; else remove SOURCE.
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--help display this help and exit
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--help display this help and exit
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--version output version information and exit
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--version output version information and exit
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The variable CMPPROG can be used to specify an alternative to \`cmp'.
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The variable CMPPROG can be used to specify an alternative to \`cmp'.
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Report bugs to ."
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Report bugs to ."
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version=`expr "$VERSION" : '\([^ ]*\)'`
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version=`expr "$VERSION" : '\([^ ]*\)'`
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version="move-if-change (gnulib) $version
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version="move-if-change (gnulib) $version
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Copyright (C) 2011 Free Software Foundation, Inc.
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Copyright (C) 2011 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later
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License GPLv3+: GNU GPL version 3 or later
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This is free software: you are free to change and redistribute it.
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law."
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There is NO WARRANTY, to the extent permitted by law."
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cmpprog=${CMPPROG-cmp}
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cmpprog=${CMPPROG-cmp}
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for arg
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for arg
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do
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do
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case $arg in
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case $arg in
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--help | --hel | --he | --h)
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--help | --hel | --he | --h)
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exec echo "$help" ;;
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exec echo "$help" ;;
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--version | --versio | --versi | --vers | --ver | --ve | --v)
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--version | --versio | --versi | --vers | --ver | --ve | --v)
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exec echo "$version" ;;
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exec echo "$version" ;;
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--)
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--)
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shift
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shift
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break ;;
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break ;;
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-*)
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-*)
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echo "$0: invalid option: $arg" >&2
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echo "$0: invalid option: $arg" >&2
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exit 1 ;;
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exit 1 ;;
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*)
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*)
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break ;;
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break ;;
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esac
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esac
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done
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done
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test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; }
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test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; }
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if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then
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if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then
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rm -f -- "$1"
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rm -f -- "$1"
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else
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else
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if mv -f -- "$1" "$2"; then :; else
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if mv -f -- "$1" "$2"; then :; else
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# Ignore failure due to a concurrent move-if-change.
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# Ignore failure due to a concurrent move-if-change.
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test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null && rm -f -- "$1"
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test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null && rm -f -- "$1"
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fi
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fi
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fi
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fi
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## Local Variables:
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## Local Variables:
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## eval: (add-hook 'write-file-hooks 'time-stamp)
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## eval: (add-hook 'write-file-hooks 'time-stamp)
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## time-stamp-start: "VERSION='"
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## time-stamp-start: "VERSION='"
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## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
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## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
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## time-stamp-time-zone: "UTC"
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## time-stamp-time-zone: "UTC"
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## time-stamp-end: "'; # UTC"
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## time-stamp-end: "'; # UTC"
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## End:
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## End:
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