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On a UNIX system, there can be ____ shells running simultaneously.

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On a UNIX system, there can be ____ shells running simultaneously.

(a) 1

(b) 2

(c) many

(d) 4

This question was addressed to me in an online interview.

This intriguing question comes from Shell Basics topic in chapter The Shell of Unix

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Best answer
Right answer is (c) many

Easiest explanation: Even though there is only one kernel running on our system, there can be multiple shells running in action –one for each user who is logged in. As we know that computers don’t have any inherent capability of translating commands into actions, this piece of a task is performed by the command interpreter –known as the shell.

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