Index: trunk/ippTasks/diff.pro
===================================================================
--- trunk/ippTasks/diff.pro	(revision 14681)
+++ trunk/ippTasks/diff.pro	(revision 14693)
@@ -145,6 +145,6 @@
       $outroot = `ipp_datapath.pl $WORKDIR`
     end
-    $outroot = $outroot/diff$DIFF_ID
-    $logfile = $outroot/skycell.log
+    sprintf outroot "%s/diff.%s" $outroot $DIFF_ID
+    sprintf logfile "%s/skycell.log" $outroot
     stdout $logfile
     stderr $logfile