The presence of a parent PID (PPID) implies that one process is created by another process.

父 PID (PPID) 的存在意味着这是一个由别的进程创建的进程。

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Fork creates a child process that differs from the parent process only in its PID and PPID; in fact, the resource utilizations are set to 0.

fork会创建一个子进程，与父进程相比只是PID和PPID不同；实际上，资源利用设为0。

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Notice that the parent process id (PPID) in the first output of ps is 8619, which is the process id (PID) of the script.

注意：ps的第一个输出中的父进程id (PPID)为8619，这是脚本的进程id (PID)。

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