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What Is grep?

grep is a command line text search utility originally written for Unix. The name is taken from the first letters in global / regular expression / print, ...

http://en.wikipedia.org/wiki/Grep

Grep is a tool that originated from the UNIX world during the 1970's. It can search through files and folders (directories in UNIX) and check which lines in those files match a given regular expression. Grep will output the filenames and the line numbers or the actual lines that matched the regular expression. All in all a very useful tool for locating information stored anywhere on your computer, even (or especially) if you do not really know where to look.


http://www.regular-expressions.info/grep.html

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