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grep


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. To rapidly scan a file or set of
   files looking for a particular string or pattern (when browsing
   through a large set of files, one may speak of `grepping
   around').  By extension, to look for something by pattern.  "Grep
   the bulletin board for the system backup schedule, would you?"
   See also vgrep.