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authorBen Elliston <bje@au.ibm.com>2005-09-07 00:42:19 +0000
committerBen Elliston <bje@au.ibm.com>2005-09-07 00:42:19 +0000
commit2016dfccf9e58f56dd244634a89b308a816e91bf (patch)
treefb4e99beda1e86ec38f4dc16cfec28f794c3806c /move-if-change
parentcf1f553f85055488c53dba6956aa9ddc19e19cc5 (diff)
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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.
Diffstat (limited to 'move-if-change')
-rwxr-xr-xmove-if-change44
1 files changed, 17 insertions, 27 deletions
diff --git a/move-if-change b/move-if-change
index d267e72..ff74a55 100755
--- a/move-if-change
+++ b/move-if-change
@@ -1,32 +1,22 @@
#!/bin/sh
+# Like mv $1 $2, but if the files are the same, just delete $1.
+# Status is zero if successful, nonzero otherwise.
-# Copyright (C) 1996 Free Software Foundation, Inc.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+usage="$0: usage: $0 SOURCE DEST"
-if
-test -r $2
-then
-if
-cmp $1 $2 > /dev/null
-then
-echo $2 is unchanged
-rm -f $1
-else
-mv -f $1 $2
-fi
+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
+ mv -f "$1" "$2"
fi