1 files changed, 17 insertions, 0 deletions
diff --git a/move-if-change b/move-if-change
new file mode 100755
index 0000000000..66d8b8adc7
--- /dev/null
+++ b/move-if-change
@@ -0,0 +1,17 @@
+#!/bin/sh
+# Like mv $1 $2, but if the files are the same, just delete $1.
+# Status is 0 if $2 is changed, 1 otherwise.
+if
+test -r $2
+then
+if
+cmp -s $1 $2
+then
+echo $2 is unchanged
+rm -f $1
+else
+mv -f $1 $2
+fi
+else
+mv -f $1 $2
+fi