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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.
相關(guān)問題拓展閱讀：
- Linux里面ps -aux ｜grep sshd命令作用是什么？
Linux里面ps -aux ｜grep sshd命令作用是什么？
l題主你好,
ps-aux簡單來說就是回顯所有進(jìn)程的信息;
grep sshd 表示使用grep查找包含sshd的行;
將這兩個(gè)命令用管道敬碧符連起來表示:
在ps -aux回顯的所有進(jìn)程信息中查找包含sshd的行并顯示在終端里.
linux系統(tǒng)
中, 正常情況下, 每個(gè)程序啟動(dòng)后, 在進(jìn)程列表中都能看到相對(duì)應(yīng)的信息, 而對(duì)系統(tǒng)中進(jìn)程信息的查看就是通過ps命令: 下面是我系統(tǒng)中ps -aux顯示的進(jìn)程信息的一部分帶衫:
可以看到進(jìn)程信息很多, 如果系統(tǒng)里面運(yùn)行的程序多了,可能會(huì)有上百行, 甚至更多, 此時(shí)我們只想看包含
字符串
sshd的行,則可以直接使用, ps -aux | grep sshd, 我系統(tǒng)上恰好就有sshd這個(gè)進(jìn)程, 看下測(cè)試截圖:
寫在最后, 說簡單些, grep命令就相同于一個(gè)過濾器, 從眾多行中將符合條件的行給挑出來.
希望可以幫到題主蠢稿腔, 歡迎追問
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名稱欄目：Linux PS命令如何使用 (linux ps作用)
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