A stack is First In Last Out. (Think the tray or plate stack in a cafeteria. The last one put on the stack is the first one removed.) Example from either the Programming Perl 3rd Ed or Perl Cookbook... don't remember which. You 'push' onto a stack and 'pop' off of it.

A list is First In First Out. You 'unshift' into a list and 'shift' out of it.

*** NOTE: of course you are free to do as you like. So you could push and shift, or unshift and pop or whatever you want...

Updated: Okay, I looked it up and I was on the right track: "When you push and pop (or shift and unshift) an array, it's a stack; when you push and shift (or unshift and pop) an array, it's a queue." -- Programming Perl, 3rd Edition; Chapter 9 Data Structures, Pg. 268

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Matthew Musgrove
Who says that programmers can work in the Marketing Department?
Or is that who says that Marketing people can't program?