1. grep information science> A Unix command for searching files for lines matching a given regular expression RE. Named after the qed/ed editor subcommand "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. There are two other variants, fgrep which searches only for fixed strings and egrep which accepts extended REs but is usually the fastest of the three. Used by extension to mean "to look for something by pattern". When browsing through a large set of files, one may speak of "grepping around". "Grep the bulletin board for the system backup schedule, would you?" See also vgrep. [Jargon File] grey-scale US "gray-scale" 1. Composed of discrete shades of grey. If the pixels of a grey-scale image have N bits, they may take values from zero, representing black up to 2^N-1, representing white with intermediate values representing increasingly light shades of grey. If N=1 the image is not called grey-scale but could be called monochrome. 2. A range of acurately known shades of grey printed out for use in calibrating those shades on a display or printer.
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