sorting the chars in a string

I've been trying to think of a simple way to alphabetically sort an
individual string

Say I have the string x="abdcf"
Is there a way to sort it and return a new string which is in correct
alphabetical order,
and/or reverse alphabetical order.

Maybe its obvious, but I havent worked with strings too much in IDL
and I cant seem to find
a way to do this (strsplit and stregex somehow??)

Thanks,
Elisha