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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
grep
A Unix command for
searching files for lines matching a given {regular
expression} (RE). Named after the qed/ed editor
subcommand "g/re/p", where re stands for a regular expression,
to Globally search for the Regular Expression and Print the
lines containing matches to it. There are two other variants,
fgrep which searches only for fixed strings and egrep which
accepts extended REs but is usually the fastest of the three.
Used by extension to mean "to look for something by pattern".
When browsing through a large set of files, one may speak of
"grepping around". "Grep the bulletin board for the system
backup schedule, would you?" See also vgrep.
[Jargon File]