Introducing the usage of PS command in Linux

Title: In-depth understanding of Linux PS command: function introduction and code examples

In the Linux operating system, the PS command is a very practical tool that can help users view Process information running in the system and monitor the operation of the system. This article will introduce the basic functions and common options of the PS command, and demonstrate how to use the PS command to view and manage processes through specific code examples.

1. Introduction to PS command

PS command is the abbreviation of Process Status, which is used to display the process information currently running in the system. Through the PS command, users can view the PID (process ID), CPU usage, memory usage and other information of the process to help users monitor the operation of the system.

2. Basic usage of PS command

1. Display all process information

ps -ef

This command will list all processes in the system Detailed information about the process, including the user, PID, CPU usage, etc. of the process.

2. Display the process information of the specified user

ps -u username

Use this command to view the process information of the specified user, and only display the process list of the user.

3. Display detailed information of the specified process

ps -p PID

This command can display detailed information of a specific process, where PID is the ID number of the process.

3. PS command common options

1. -e: Display all process information.
2. -f: Display complete process information.
3. -u: Display the process information of the specified user.
4. -p: Display detailed information of the specified process.
5. -l: Display process information in detailed format.
6. -aux: Display information about all processes, including processes without a controlling terminal.

4. PS command example

1. Display all process information in the system:

ps -ef

Output result example:

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 11:25 ?        00:00:06 /sbin/init
root         2     0  0 11:25 ?        00:00:00 [kthreadd]
root         3     2  0 11:25 ?        00:00:00 [ksoftirqd/0]

2. Display the process information of the specified user:

ps -u root

Output result example:

PID TTY          TIME CMD
1   ?        00:00:06 init
2   ?        00:00:00 kthreadd
3   ?        00:00:00 ksoftirqd/0

5. Summary

Through the above introduction to the functions of the PS command and From the code example, we can see that the PS command is a powerful process management tool and is widely used in Linux systems. Users can select different options to view process information in the system according to their own needs, helping to monitor the operation of the system and achieve better system management. I hope this article will help you understand the PS command under Linux.

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