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。
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。
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)。
A kind of predictive PID PPID controller for several types of unstable plus time delay processes is proposed.
针对几种不稳定滞后过程，给出一种预测PID控制器的结构形式。
A kind of predictive PID PPID controller for several types of unstable plus time delay processes is proposed.
针对几种不稳定滞后过程，给出一种预测PID控制器的结构形式。
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