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    Wow! More info than I possibly could have hoped for. Thank you many times for your answer; I really appreciate all the effort you put into this! You've just shown me that I really, really have a lot to learn. I'm off to buy a book on bash :P. Commented Jul 4, 2011 at 0:10
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    That's what I would call the definitive answer! :) Commented Jul 4, 2011 at 6:19