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6.1.7.4 grep Procedure

Search the file called filename (a fully specified path) for lines that contain a match for regular expression regexp. The result is a list of all the lines that match. If no lines match, the result is an empty string. Specify regexp using the standard regular expression style used by the Unix utility program grep.

Use the optional third argument line to start lines in the result with the line number in filename. (This argument is simply an option flag; type it just as shown --line.)

grep{filename regexp –line}

filename

The file to search.

regexp

The Unix style regular expression (as used by the grep Unix utility) to search for.

--line

Prefix the line number to each line where the regexp matches.