print unique entries

# when adding values from $FROM to $T0
# print only those lines which are not found in $TO
# be carefull with partial match

FROM=$1
TO=$2
for x in `cat $FROM`;do 
  grep $x $TO > /dev/null;
  ret=$?;
  if [ $ret -ne 0 ];then
    echo $x;
  fi;
done

this is helpful if we can't sort both files