fgrep - meaning and definition. What is fgrep
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What (who) is fgrep - definition

UNIX COMMAND LINE UTILITY
GREP; Fgrep; Egrep; Grep (Unix); Grepping; Rgrep; Globally search a regular expression and print; FGREP (command); FGREP; G/re/p; Pcregrep

fgrep         
<tool> A variant of the Unix grep command which searches for fixed (uninterpreted) strings rather than {regular expressions}. Surprisingly, this is not always faster. (1996-10-27)
FGREP         
Fixed Global Regular Expression Print (Reference: Unix, GREP)
EGREP         
Extended Global Regular Expression Print (Reference: Unix, GREP)

Wikipedia

Grep

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 for a regular expression and print matching lines), which has the same effect. grep was originally developed for the Unix operating system, but later available for all Unix-like systems and some others such as OS-9.