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First appearing in Version 4 Unix, grep was created by Ken Thompson as a standalone application adapted from the regular expression parser he had written for ed (which he also created). In ed, the command g/re/p would print all lines matching a previously defined pattern.
This enables users to type a short series of characters and meta characters into a grep command to have the computer show us what lines in which files match. The standard grep command looks like: grep <flags> '<regular expression>' <filename> grep prints the search results to the screen (stdout) and returns the following exit values: