unlocking a file

[jtownsen]

I have a hierarchy of folders that I'd like to delete. Normally I'd use "rm 
-r". However, there folders contain at least one file that is locked. I'm 
familiar with using chmod to change permissions. However a locked file on a 
Mac, as I understand it, is a not a permission thing, but a Mac OS thing.

I've heard that their is an Apple-provided tool to unlock files (e.g. in 
terminal). Anyone know what the tool is called? Or any other approach?

Thanks