Question

Which of the following is performed by expr string handling’s function?

(a) determine the length of string

(b) extract a substring

(c) locate the position of a character in a string

(d) determine the length of string, extract and locate the position of the string

I have been asked this question in an interview for job.

My doubt is from Case and Expr Command in section Essential Shell Programming of Unix

Answer 1

Correct answer is (d) determine the length of string, extract and locate the position of the string

To explain I would say: Though expr’s string handling features are not that elegant, bourne shell users hardly have any choice. For evaluating strings expr uses two expressions separated by a colon.