O_DIRECT means that it can search a large list of files without messing up your buffer cache.

Usage looks like:

Usage: /usr/local/bin/bcgrep
	-0                                        Read and write null separated lines
	--filenames file1 file2 ... filen         Search in specified filenames
	--pattern regex                           Search for regex
	--use-odirect                             Do not pollute the buffer cache - experimental
	--invert-match|-v                         List non-matches
	--files-with-matches|-l                   List filenames containing one or more matches - only
	--help                                    Output this help message

See also bgrep for another grep tool that can do binary searches.

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