:vgrep: /vee'grep/ v.,n. Visual grep. The operation of finding
patterns in a file optically rather than digitally (also called an
`optical grep'). See {grep}; compare {vdiff}.
-- The AI Hackers Dictionary
grep: /grep/ [from the qed/ed editor idiom 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,
via {{UNIX}} `grep(1)'] vt....