shift ARRAY
shift
Shifts the first value of the array off and returns it, shortening the
array by 1 and moving everything down. If there are no elements in the
array, returns the undefined value. If ARRAY is omitted, shifts the
@ARGV array in the main program, and the @_ array in subroutines.
(This is determined lexically.) See also unshift(), push(), and pop().
Shift() and unshift() do the same thing to the left end of an array
that push() and pop() do to the right end.
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