Interpret the functions of Linux PS command

Linux operating system is a commonly used operating system that is widely used in servers and personal computers. In Linux systems, there are many commands that can be used to manage system status and monitor processes, one of which is the PS command. The PS command is a very powerful command that can be used to view detailed information about processes or programs running in the system, including process ID, CPU usage, memory usage, etc. This article will analyze the purpose of the PS command and provide some specific code examples.

1. Basic usage of PS command

The basic syntax of PS command is as follows:

ps [options]

PS command is a simple command without any parameters, and its default behavior is to list Exit all processes of the currently logged in user. The behavior of the PS command can be modified by adding different options. Some commonly used options and their uses are introduced below.

2. PS command common options

1. -e: List all processes in the system.
2. -f: Display complete process information.
3. -l: Display process information in long format.
4. -h: Do not display the title line.
5. -u: Displays the user name and other details of the process owner.

3. PS command example

3.1 List all processes in the system

ps -e

This command will list all processes in the system, including those of other users process.

3.2 Display complete process information

ps -f

This command will display complete process information, including process ID, parent process ID, CPU usage, memory usage and other detailed information.

3.3 Display process information in long format

ps -l

This command will display process information in long format, including process details and status.

3.4 Display the process information of the specified user

ps -u username

This command will display all the process information of the specified user. You can view the user's process information by replacing username with a specific user name. process.

4. Conclusion

PS command is a very practical process management tool in Linux systems, which can help users monitor system status and manage processes. Through the introduction of this article, readers can become more familiar with the basic usage and common options of PS commands, and can deepen their understanding through specific code examples. Hope this article is helpful to readers!

The above is the detailed content of Interpret the functions of Linux PS command. For more information, please follow other related articles on the PHP Chinese website!