in reply to verifying user input with Find::File
I guess you missed that well-written introduction into File::Find written by a Perl Monk. Most of your questions are answered in the code samples there.
And regarding the "Camel book" you mentioned... it's more like an presentation of Perl than a complete documentation. I like to read it when taking a bath. When at work, I'd suggest to instead read the more detailed Perl documentation.
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