print lines matching a pattern

-v, --invert-match
       Invert the sense of matching, to select non-matching lines.  (-v is specified by POSIX.)

-f FILE, --file=FILE
       Obtain patterns from FILE, one per line.  The empty file contains  zero  patterns,  and  therefore
       matches nothing.  (-f is specified by POSIX.)

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.