如何获取后台进程的进程ID? [英] How to get process ID of background process?

问题描述

我从shell脚本启动了一个后台进程，我想在脚本结束后终止该进程.

I start a background process from my shell script, and I would like to kill this process when my script finishes.

如何从我的shell脚本中获取此过程的PID?据我所知，变量$!包含当前脚本的PID，而不是后台进程.

How to get the PID of this process from my shell script? As far as I can see variable $! contains the PID of the current script, not the background process.

推荐答案

您需要在启动时保存后台进程的PID:

You need to save the PID of the background process at the time you start it:

foo &
FOO_PID=$!
# do other stuff
kill $FOO_PID

您不能使用作业控制，因为它是一种交互式功能，并且与控制终端绑定在一起.脚本不一定要附加终端，因此作业控制不一定可用.

You cannot use job control, since that is an interactive feature and tied to a controlling terminal. A script will not necessarily have a terminal attached at all so job control will not necessarily be available.

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