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grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. 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. Grep was originally developed for the Unix operating system, but later available for all Unix-like systems.
The fgrep variant searches for any of a list of fixed strings using the AhoâCorasick string matching algorithm. Binaries of these variants persist in most modern systems, however their explicit usage has been deprecated and the functionalities of these variants are included in grep as the command-line switches -E and -F; the use of the switches is therefore the recommended method of use.