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plan9-grep.1
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egrep(1)
fgrep(1)
grep(1)
rgrep(1)
grep(1posix)
-oP %27%5Cd%2B%5C.%5Cd%2B%5C.%5Cd%2B%5C.%5Cd%2B%28%5C%2F.%5Cd%2B%7C%29%27 file_with_ips
search a file for a pattern
source manpages:
plan9-grep