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The parent id of a child is called ______

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in Unix by (67.2k points)
The parent id of a child is called ______

(a) PID

(b) PPID

(c) TID

(d) PTID

This question was posed to me during an online exam.

The origin of the question is Process Basics in chapter The Process of Unix

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The correct option is (b) PPID

To explain I would say: The parent ID of a child process is called  PPID (parent process ID) and is available as a process attribute. It is common that several processes have the same parent. When several processes have the same parent, it often makes sense to kill the parent process rather than killing each child separately.

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