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One of the nice things about writing a column every week is that I don't often have to tackle the really big issues -- such as why Unix is still the best OS or which big company is buying which other big company and how this is going to affect all of us. Instead, I can hone in on an issue as small and personal as how you loop through a sequence of values in a script. Speaking of looping, I've just learned (and then implemented) a new trick.