Question

Which one of the following is the correct syntax for performing substitution using sed?

(a) sed [address]s  /expr1/ expr2

(b) sed [address]s  /expr1 expr2

(c) sed [address]s  /expr1/ expr2/ flags

(d) sed [address]s

I had been asked this question in an interview.

This question is from sed command in portion Filters using Regular Expressions of Unix

Answer 1

Right answer is (c) sed [address]s  /expr1/ expr2/ flags

Best explanation: Substitution is one of the most important features of sed as it allows us to replace a pattern in its input with some other pattern. The correct syntax for performing substitution is :