-c, --count # print the count of matching lines. suppresses normal output
--color[=WHEN] # applies color to the matches. WHEN is never, always, or auto
-m, --max-count=NUM # stop reading after max count is reached
-o, --only-matching # only print the matched part of a line
-q, --quiet, --silent
-s, --no-messages # suppress error messages about nonexistent or unreadable files