http://www.linux.com/print.pl?sid=06/05/19/1920231

grep changes quick reference

-Cx prints context lines before and after matches and must have argument x.

--color outputs matches in color (default red).

-D action specifies an action to take on device files (the default is "read").

--exclude= filespec excludes files matching filespec.

--include= filespec only searches through files matching filespec.

--label= name makes name the new label for stdin.

--line-buffered turns on line buffering.

-m X stops searching input after finding X matched lines.

-o outputs only matched patterns, not entire lines.

-P uses Perl-style regular expressions.

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GNU grep's new features