push adds information at end of a list(array)
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push(@stack,$new); # is equivalent to @stack = (@stack, $new);
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One can also use a list for second argument(s) in push as in
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push(@stack,6,"next",@anotherlist);
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pop is inverse operator to push and removes the last element in argument as well as returning value of this last element
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Note chop(@stack) removes last character of each entry of list -- not like pop which removes last entry of list
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unshift is idential to push except works on left (lowest indices) of list -- not on end of list
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shift is idential to pop except works on left (lowest indices) of list -- not on end of list
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reverse(@list) leaves @list unaltered but returns reversed list
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sort(@list) leaves @list unaltered but returns sorted list
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