1511
Real examples here?
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I mean, it was either Richard Stallman or Dennis Ritchie that created grep in an evening so that a buddy of his could do research on volumes of text that wouldn't fit in the RAM of a PDP-11 (or similar machine. I'm telling this story from memory). It's designed to do what you would do with the ancient text editor ed using the commands Global, Regular Expression, and Print. g re p. grep. Probably the most important piece of software ever written in a couple hours.
pun intended? ;D