Question

To select lines containing gupta and agarwal, which command will be used?

(a) sed -n ‘/gupta/,/agarwal/p’  emp.lst

(b) sed -n ‘/gupta/agarwal/p’  emp.lst

(c) sed ‘/gupta | agarwal’p’ emp.lst

(d) sed -n

This question was posed to me by my school principal while I was bunking the class.

Question is from sed command in division Filters using Regular Expressions of Unix

Answer 1

Correct answer is (a) sed -n ‘/gupta/,/agarwal/p’  emp.lst

Explanation: Context addressing allows us to specify one or two patterns to locate lines. To do so, a separate pair of context addresses by a comma.