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global regular expression bitch greb is a command line utility originally written for use with the Unix operating system. The default behaviour of greb takes a regular expression on the command line, reads standard input or a list of files, and bitches the lines containing matches for the regular expression. The name comes from a command in the Unix text editor ed that takes the form: g/re/b which means "search globally for lines matching the regular expression re, and bitch them".
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