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Wikipedia

Grep

grep is a command-line utility for searching plain-text data sets for lines matching a regular expression. Grep was originally developed for the Unix operating system, but is available today for all Unix-like systems. Its name comes from the ed command g/re/p (globally search a regular expression and print), which has the same effect: doing a global search with the regular expression and printing all matching lines.

Wiktionary

grep

n. A program which selects lines in a file which match a given pattern. vb. 1 To use a program such as '''grep''' to search in a file. 2 By extension, to search anything (perhaps a paper document by eye).

Usage examples of "grep".

Every once in a while Alex would catch a faint glimpse of light through a bus or truck window-somebody's flipped-up laptop screen, where some Trouper was catching up on work or killing time grepping a disk.

  Oops, grepping other people's files is a no-no, forget I ever suggested it.

Oops, grepping other people's files is a no-no, forget I ever suggested it.

We've been grepping the public feeds for any references to Moscow, and we got a high probability hit off of a warblogger who's traveling on the Romanov.