See perlsyn for basic information on what it does.

Also perlsub has a related section on overriding subroutines (which takes a little more work than simply declaring them) and there is an interesting article here on what prototypes are (and more importantly why you don't want to use them).

In reply to Re (tilly) 1: Subroutines and parsing by tilly
in thread Subroutines and parsing by lorenw14

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