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The original idea was to make a little program that would find text that matches target patterns from a stream of incoming text. This rather simple idea has suffered from feature creep and the result is egrep. As you can see from the above command line arguments list, there's an awful lot that it can do. To paraphrase a famous man, "Ignore those arguments behind the current." Most of the capabilities of egrep are of no practical the vast majority of the time. If you want to know the all of the sordid little details, go Google egrep.
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