Index: mttroot/mtt/bin/trans/mtt_prepend.sh
==================================================================
--- mttroot/mtt/bin/trans/mtt_prepend.sh
+++ mttroot/mtt/bin/trans/mtt_prepend.sh
@@ -14,11 +14,11 @@
 
 EOF
 }
 
 preserve=''
-while [ "`echo $1 | grep '^-'`" ]; do
+while [ -n "`echo $1 | grep '^-'`" ]; do
     case $1 in
 	-p)
 	    preserve='-p'
 	    ;;
 	-h)