Index: trunk/ippTasks/warp.pro
===================================================================
--- trunk/ippTasks/warp.pro	(revision 12369)
+++ trunk/ippTasks/warp.pro	(revision 12370)
@@ -158,5 +158,5 @@
 
     ## generate output log based on filerule
-    if ($WORKDIR == NULL)
+    if ("$WORKDIR" == "NULL")
       $outroot = `pwd`
     else
@@ -170,5 +170,5 @@
 
     $run = warp_overlap.pl --warp_id $WARP_ID --camera $CAMERA $ARGS
-    if ($WORKDIR != NULL)
+    if ("$WORKDIR" != "NULL")
       $run = $run --workdir $WORKDIR
     end
@@ -281,5 +281,5 @@
 
     ## generate output log based on filerule
-    if ($WORKDIR == NULL)
+    if ("$WORKDIR" == "NULL")
       $outroot = `pwd`
     else
@@ -293,5 +293,5 @@
 
     $run = warp_skycell.pl --warp_id $WARP_ID --skycell_id $SKYCELL_ID --tess_id $TESS_ID --camera $CAMERA $ARGS
-    if ($WORKDIR != NULL)
+    if ("$WORKDIR" != "NULL")
       $run = $run --workdir $outroot
     end