"Thank you for all the links! I am very glad. I do not have Linux, but I will try to install one to find the Perl scripts. :)"
If you're on Windows or Mac you should also be able to install modules. What issue do you have?
"But if we're going to read the entire file, then why not just compare every byte? It would be less work."
If there were only two matching files a direct comparison would be quicker, since you don't know that this is going to be the case a hash makes more sense from a performance perspective.
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