Question

The _____ function extracts a substring from a string.

(a) length

(b) index

(c) size

(d) substr

The question was posed to me in an internship interview.

This question is from Various Operations using Awk Command in chapter Awk – An Advanced Filter & Perl – The Master Manipulator of Unix

Answer 1

The correct choice is (d) substr

To explain: The substr function is used for extracting a substring from a string. The syntax for using this function is substr (str,m,n) where str is the string from which extraction is done. m represents the starting point of extraction and n indicates the number of characters to be extracted.