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Okay, so here's a quick
command review. What have you seen?

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Well, grab your ultimate filtering utility,
awk, which is a nice utility that

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allows you to find files containing
text. It's like grab on steroids.

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Set is a stream editor. It allows
you to edit text in a programmatic way.

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TR is for translate. It
changes uppercase and lowercase. For instance,

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Cut is a simple utility
that allows you to filter text.

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And Sort is a utility that allows
you to sort text in many different ways.