Grep is a powerful utility for Unix-based systems that searches the input files for lines containing a match to a given pattern list. When it finds a match in a line, it copies the line to standard output (by default), or does whatever other sort of output you have requested with options. Grep expects to do the matching on text.

Grep Searching for a Pattern is a printed version of the full Grep manual, as provided online by the Free Software Foundation.

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