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What (who) is egrep - 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
EGREP
Extended Global Regular Expression Print (Reference: Unix, GREP)
egrep
<tool> An extended version of the Unix grep command.
Egrep accepts extended regular expressions (REs) including
"*" following multi-character REs; "+" (one or more matches);
"?" (zero or one matches); "|" separating two REs matches
either. REs may be bracketed with (). Despite its additional
complexity, egrep is usually faster than fgrep or grep.
(2004-07-20)
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.
