print lines matching a pattern
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-o, --only-matching
Print only the matched (non-empty) parts of a matching line, with each such part on a separate
output line.
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-P, --perl-regexp
Interpret PATTERN as a Perl regular expression (PCRE, see below). This is highly experimental and
grep -P may warn of unimplemented features.
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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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