Doh, check for links, not for files

update_exercism.sh

@@ -2,14 +2,13 @@
 
 exercism fetch
 cd `exercism debug | grep "Exercises Directory" | cut -d: -f2`
-
 for D in *; do
   if [ -d "${D}" ] ; then
     cd ${D} 
 
     new=$(ls -tr|tail -n 1)
     if [ ${new} != "current" ] ; then
-      if [ -f current ] ; then
+      if [ -L current ] ; then
         rm current
       fi
       ln -s ${new} current