Question

Which one of the following option is used for AND operation in test command?

(a) -o

(b) -a

(c) -e

(d) -an

I got this question by my college director while I was bunking the class.

This is a very interesting question from Using test and [ ] to Evaluate Expressions in division Essential Shell Programming of Unix

Answer 1

The correct answer is (b) -a

The explanation is: test also permits the checking of more than one condition in the same line using -a (AND) operator. For example,