Hum, I see. I was expecting an equivalent to the "previously" condition in a common-lisp loop structure. A chunk of code that happens only once before the main body of the function starts iterating. I understand that if I need to do something within each subdirectory (check if something happens inside each subdir first), I would need then to traverse the tree two times using two different find functions. One for directories only, and a second for all files. Right? can't be done in one take?