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Which one of the following command is used for killing the last background job?

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in Unix by (67.2k points)
Which one of the following command is used for killing the last background job?

(a) kill $

(b) kill $$

(c) kill $!

(d) kill !

I got this question in examination.

My question is from Process Handling Commands in section The Process of Unix

1 Answer

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The correct choice is (c) kill $!

Explanation: For most shells, the system variable $! Stores the PID of the last background job. So we can kill any process by using kill command. The PID of the job can be seen when & is affixed to a command. For example,

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