Resources

perldoc perlsub is the authoritative reference about Perl subroutines.
perldoc perlfunc will help you with info about Perl's builtin functions.
perldoc -f <function> will help you with info about a specific builtin function.
If you're looking for a good tutorial in Hebrew about functions, read the beginning of chapter 5 of Semuel Fomberg's excellent Perl Tutorial.
Chapter 4, "Subroutines", from "Learning Perl" 3^rd edition, is available online from O'Reilly and is a good English tutorial about functions.

Offer Kaye. YAPC::Israel::2005.
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