Linux MCQ Questions and Answers - Set 4

This is set 4 in the ongoing series of MCQ. Hope you have enjoyed the other parts of the series. Like other sets this set also contains some Linux questions with their answers.
1In Linux which of following command do you use to know the purpose of a command?

which

whatis

what

purpose

AnswerOption B is correct, whatis display the purpose of a command.
$ whatis ls
ls (1) - list