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binutils-gdb/move-if-change
Ben Elliston 2016dfccf9 Import from Autoconf sources:
2005-09-06  Paul Eggert  <eggert@cs.ucla.edu>
	* move-if-change: Don't output "$2 is unchanged"; suggested by Ben
	Elliston.  Handle weird characters correctly.
2005-09-07 00:42:19 +00:00

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#!/bin/sh
# Like mv $1 $2, but if the files are the same, just delete $1.
# Status is zero if successful, nonzero otherwise.
usage="$0: usage: $0 SOURCE DEST"
case $# in
2) ;;
*) echo "$usage" >&2; exit 1;;
esac
for arg in "$1" "$2"; do
case $arg in
-*) echo "$usage" >&2; exit 1;;
esac
done
if test -r "$2" && cmp -s "$1" "$2"; then
rm -f "$1"
else
mv -f "$1" "$2"
fi