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Perl in a Nutshell

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Function Reference
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sub name [proto] {block}
sub [proto] name

Declares and defines a subroutine. name is the name given to the subroutine; block is the code to be executed when the subroutine is called. Without block, this statement only declares a subroutine, which must be defined at some later point in your program. proto is a sequence of symbols that places constraints on the arguments that the subroutine will receive. See Section 4.7, "Subroutines" in Chapter 4.

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