Linux PS命令如何使用 (linux ps作用)

Linux PS Command: A Comprehensive Guide

As a Linux user, the PS command is one of the essential tools in your arsenal of command-line utilities. The PS command provides an extensive insight into the system’s running processes and their resource utilization, such as CPU, memory, and disk usage. In this article, we’ll cover how to use the Linux PS command to its fullest extent.

The Basics:

To start using the PS command, you first need to open your terminal and type in PS. This command will display a list of running processes on your system. The basic output of the PS command includes the process ID (PID), the user who initiated the process, and the name of the process.

Using the PS Command with Options:

The PS command provides various options to customize the output of the list of running processes. In the following section, we’ll detl some of the most common options avlable:

1. -a: Lists all processes on the system, including those that belong to other users.

2. -u: Displays the user name or owner of the process along with additional detls such as the CPU usage and the memory utilization.

3. -f: Provides a more detled output of the processes, including the parent process ID (PPID), the running time, the CPU and memory usage, and the name of the command that initiated the process.

4. -x: Displays a list of processes that don’t have an attached terminal.

5. –sort: Allows you to sort the output of the PS command based on different attributes such as CPU usage, memory utilization, and process name.

6. -e: Displays all processes on the system, including kernel threads.

7. -H: Shows a complete hierarchical view of the processes, including child processes.

8. -o: Enables you to specify the columns you want to include in the output.

9. -C: Displays information about a particular command only.

Examples of the PS Command:

Let’s illustrate the usage of the PS command using examples.

1. Displaying all processes running on the system:

ps -e

2. Showing the running processes for a specific user:

ps -u username

3. Finding the top CPU consuming processes:

ps –sort=-%cpu | head

4. Displaying the process status and their corresponding priorities:

ps -eo pid,ppid,cmd,%cpu,%mem,state,priority

5. Showing the parent process ID and its child processes:

ps -p PPID -o pid,command

Conclusion:

The PS command is an essential tool for system administrators and developers alike. It provides a comprehensive overview of the running processes and their resource utilization, allowing you to troubleshoot and optimize your system performance. With the options and examples provided in this article, you should be able to use the PS command effectively and efficiently.