Even if you're already familiar with the printf command, if you got your information via "man printf" you may be missing a couple of useful features that are provided by bash's built-in version of the ...

That really is all there is to make your own classes work with printf. Whenever you want to display them, be sure to use a properly configured %s setting within the formatting string.

Basically, use <B>open</B> to create a filehandle (in the appropriate mode -- e.g. read, write, append, whatever) and then pass that as the first argument to printf, then close the filehandle.