In addition to what Corion said, I already answered that question. In the case of the find, File::Find is a core module. And in the case of the Perl script, you can modify it so that it is directly callable from your Perl script, or at the very least, you can modify it so that it supports input and output via files (if it doesn't already), that is very easy to do in Perl, then you can call it with a multi-argument system as I describe in the node I linked to.