Question

To suppress the behavior of ‘p’ command of sed, we use ____ option.

(a) -q

(b) -n

(c) -i

(d) -v

The question was posed to me by my college professor while I was bunking the class.

Origin of the question is sed command topic in division Filters using Regular Expressions of Unix

Answer 1

The correct choice is (b) -n

For explanation: When we use ‘p’, it behaves in a strange manner i.e. it both displays and prints the selected lines.  So the selected lines will appear twice. To suppress this behavior, we use the -n option whenever we use the p command. For example,