lib/Tools/mkdir

--- a/lib/Tools/mkdir	Sat Feb 05 16:59:50 2000 +0100
+++ b/lib/Tools/mkdir	Sat Feb 05 17:06:27 2000 +0100
@@ -21,7 +21,7 @@
   echo "    -p           include parent logic target"
   echo
   echo "  Prepare session directory, including IsaMakefile, document etc."
-  echo "  with parent LOGIC (default \$ISABELLE_LOGIC=$ISABELLE_LOGIC)"
+  echo "  with parent LOGIC (default ISABELLE_LOGIC=$ISABELLE_LOGIC)"
   echo
   exit 1
 }