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Which command does not terminates unless we log out of the system?

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Which command does not terminates unless we log out of the system?

(a) history

(b) shell

(c) echo

(d) login

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

My question is based upon Shell Basics in section The Shell of Unix

1 Answer

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Correct choice is (b) shell

Explanation: When we log on to a UNIX system, we first see a prompt. This prompt remains there until we key in something. Even when we think the system is idling, a UNIX command is always running at the terminal. This command is known as the shell. The shell is with us all the time and doesn’t terminates unless we log out.

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