Personally, I avoid ever doing a require 'Something.pl'. If I have a subroutine in a script which I need to use in another script, I put it in a module and use it. The only time I use require to include code is when I need to dynamically include something at run time.
As I understand it, use is a compile time directive, and will have the same effect whether it is inside a subroutine that is called repeatedly, or at the top of the script or file.
May the Force be with you
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