什么是.pid文件，它包含什么? [英] What is a .pid file and what does it contain?

问题描述

我最近遇到了一个扩展名为.pid的文件，并在文件内部进行了浏览，但没有找到太多.该文档说:

I recently come across a file with the extension .pid and explored inside it but didn't find much. The documentation says:

Pid-File是一个包含进程标识号(pid)的文件，该文件存储在文件系统的明确定义的位置，因此允许其他程序找出正在运行的脚本的pid.

A Pid-File is a file containing the process identification number (pid) that is stored in a well-defined location of the filesystem thus allowing other programs to find out the pid of a running script.

任何人都可以对此进行更多说明，或指导我了解pid文件中包含的内容的详细信息吗?

Can anyone shed more light on this, or guide me to details of what's contained in the pid file?

推荐答案

pid文件包含给定程序的进程ID(数字).例如，Apache HTTPD可以将其主进程号写入pid文件(这是一个常规文本文件，仅此而已)，然后使用其中包含的信息停止自身.您还可以使用该信息使用cat filename.pid | xargs kill

The pid files contains the process id (a number) of a given program. For example, Apache HTTPD may write its main process number to a pid file - which is a regular text file, nothing more than that - and later use the information there contained to stop itself. You can also use that information to kill the process yourself, using cat filename.pid | xargs kill

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