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Perl in a Nutshell

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Function Reference
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pop @array

Treats an array like a stack, popping and returning the last value of the array, shortening the array by one element. If array is omitted, the function pops @ARGV (in the main program), or @_ (in subroutines).

If there are no elements in the array, pop returns the undefined value. See also push and shift. If you want to pop more than one element, use splice.

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