I too agree that we cannot do your homework for you.
An excellent tool for getting started with perl is: Perl for Dummies--They spell everything out in this book.
Did you try searching this site on commands such as dir(). Many people have snippets of code where they read directories. Also use google to search on specific perl commands. They are many examples out there.
Once you have a good idea, come on back and ask a more specific question. We want to help, but want to know that you really are trying to understand the language: you task is not a difficult one.
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