grep [-E|-F] [-c|-l|-q] [-insvx] -e pattern_list [-e pattern_list]... [-f pattern_file]... [file...]
grep [-E|-F] [-c|-l|-q] [-insvx] [-e pattern_list]... -f pattern_file [-f pattern_file]... [file...]
grep [-E|-F] [-c|-l|-q] [-insvx] pattern_list [file...]