Index: Tools/scripts/bump-revision.sh
===================================================================
--- Tools/scripts/bump-revision.sh	(revision 466223)
+++ Tools/scripts/bump-revision.sh	(working copy)
@@ -48,6 +48,12 @@
 while [ $# -gt 0 ]
 do
     if [ -f "$1/Makefile" ]; then
+        # See what the port thinks its PORTREVISION is and save that.
+        startdir=`pwd`
+        cd "$1"
+        pre=$(make -V PORTREVISION)
+        cd "$startdir"
+
         # If the Makefile exists, continue and empty the tempfile, set up variables
 	echo -n > $tempfile
         revision_str=`grep "^PORTREVISION?\?=" "$1/Makefile"`
@@ -92,6 +98,15 @@
             if ! grep -q "^PORTREVISION?\?=" $1/Makefile; then
                     printc "ERROR: $1 PORTREVISION not found and failed to add it!" "red"
             fi
+
+            # See what the port now has for PORTREVISION.
+            cd "$1"
+            post=$(make -V PORTREVISION)
+            cd "$startdir"
+
+            if [ "$post" -le "$pre" ]; then
+                printc "ERROR: $1 PORTREVISION went backwards from $pre to $post!" "red"
+            fi
             ;;
         *)
             printc "ERROR: PORTREVISION grep for $1 exited with error!" "red"