FOC/L4RE: Upstream revision 40

kernel/fiasco/tool/move-if-change

@@ -0,0 +1,19 @@
+#!/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.
+quiet=
+if test $1 = "-q"; then
+  quiet=1
+  shift
+fi
+if test -r $2; then
+  if cmp -s $1 $2; then
+    test $quiet || echo $2 is unchanged
+    rm -f $1
+    exit 1
+  else
+    mv -f $1 $2
+  fi
+else
+  mv -f $1 $2
+fi