Well no. Of course you don't need a module to do it. You don't need a module to do anything in Perl. But if you want to reuse the code in a number of programs then it makes sense to put it a module. Which is what I did. And then I put it on CPAN in the hope that it would save people time as they wouldn't need to write those functions themselves.

But, obviously, feel free to not use it :-)