=over

=item pop ARRAY

=item pop

Pops and returns the last value of the array, shortening the array by
1.  Has a similar effect to

    $tmp = $ARRAY[$#ARRAY--];

If there are no elements in the array, returns the undefined value.
If ARRAY is omitted, pops the
C<@ARGV> array in the main program, and the C<@_> array in subroutines, just
like C<shift()>.

=back