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