print lines matching a pattern
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-I Process a binary file as if it did not contain matching data; this is equivalent to the
--binary-files=without-match option.
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-R, -r, --recursive
Read all files under each directory, recursively; this is equivalent to the -d recurse option.
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-l, --files-with-matches
Suppress normal output; instead print the name of each input file from which output would normally
have been printed. The scanning will stop on the first match. (-l is specified by POSIX.)
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grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus
(-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints
the matching lines.
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