Question

Which of the following is a correct initialization of variables to null strings?

(a) x=

(b) x=’ ‘

(c) x=” “

(d) x=, x=’ ‘, x=” “

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

I want to ask this question from Command Substitution and Shell Variables topic in chapter The Shell of Unix

Answer 1

Correct option is (d) x=, x=’ ‘, x=” “

The best explanation: All shell variables are initialized to null strings by a string. While explicit assignment of null strings can be performed with x=’ ‘ or x=” “ or x=