Expansion of the acronym "grep"

[Andrew Hume]

i know i ought not add to the cloud of confusion but i'm in a bad mood.
as some people have observed, grep comes from the ed idiom
	g/re/p

al aho coined egrep for an extended grep which handled alternation amongst other things
he also coind fgrep for the special case of looking for fixed strings.
it has never NEVER NEVER NEVER NEVER stood for fast grep
(as anyone with a clock could tell).
if you don't believe me, mail ava at research.att.com and ask al aho yourself.