fork(2)系统调用创建一个新进程。

The fork(2) system call creates a new process.

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prefork模型会为每个请求创建一个新进程。

In the prefork model, a new process is created per request.

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为了运行ps，bash 会分叉，创建一个新进程；新进程通过使用执行，使其本身得以重生，转化为 ps的一个新的实例。

To run ps, bash forks to create a new process; the new process reincarnates itself using execution, turning into a new instance of ps.

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而且，这两个脚本都要小心地使用exec外壳命令，这个命令用一个程序替代另一个程序，但是没有创建新进程。

Also, both scripts are careful to use the exec shell command, which replaces one program with another but does not create new processes.

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这是因为在fork调用中创建了一个新进程。

This is because a new process is created within the call to fork.

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这是因为在fork调用中创建了一个新进程。

This is because a new process is created within the call to fork.

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