The following operations can be performed on "grep":
Searches files or output for lines containing a match to the specified
grep [-c] [-E] [-i] [-v] [-w] [-x]
c Suppress normal output. Instead print a count of matching lines. With the -v option, count non-matching lines.
i Ignore case distinctions.
v Invert the sense of matching, to select non-matching lines.
w Select only those lines containing matches that form whole words.
x Select only those matches that exactly match the whole line.
pattern The pattern (regular expression or text string) for which to search.
show ns info | grep off -i