-m NUM, --max-count=NUM
	      Stop reading a file after NUM matching lines.  If the  input  is
	      standard	input  from a regular file, and NUM matching lines are
	      output, grep ensures that the standard input  is	positioned  to
	      just  after the last matching line before exiting, regardless of
	      the presence of trailing context lines.  This enables a  calling
	      process  to resume a search.  When grep stops after NUM matching
	      lines, it outputs any trailing context lines.  When  the	-c  or
	      --count  option  is  also	 used,	grep  does  not output a count
	      greater than NUM.	 When the -v or --invert-match option is  also
	      used, grep stops after outputting NUM non-matching lines.