I suggest you give it a try. Post code that you've written when you run into a problem. You can look around on Perlmonks and gather snippets to do the job and practically not have to think at all.

This problem has been addressed by others many times, and as recently as two days ago, for instance in the thread file comparison using file open in binary mode.. There is no one perfect way. The rule in Perl is "There's More Than One Way To Do It".

However, the only way to learn to write code is to write code. Give it Old College Try.