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Editor to share with you what commands you must know in Linux. I hope you will gain something after reading this article. Let's discuss it together.

Top

The top command is a commonly used command to view the usage of system resources and the processes that take up the most system resources. Top displays all processes as columns, and the processes that account for the most CPU resources are displayed at the top.

To exit top or htop, you can use the keyboard shortcut Ctrl-C. This keyboard shortcut usually terminates the process currently running on the terminal.

Htop

The htop command is an improved version of top. By default, most Linux distributions do not have htop-- installed on Ubuntu systems to run the following command:

Sudo apt-get install htop

The htop command displays the same information as top, but its interface is more user-friendly. You can use the keyboard arrow keys to select processes and take certain actions, such as killing processes or changing their priorities.

We have explained htop in detail in the past.

Ps

The ps command lists the running processes. The following command lists all commands running on your system:

Ps-A

This command may list too much information to read. You can use the less command to pipe the output so that you can scroll through it at your speed:

Ps-A | less

When you have finished reading, you can press Q to exit.

You can also use grep to pipe the output so that you can search for a process without using other commands. The following command searches for the Firefox process:

Ps-A | grep firefox

Pstree

The pstree command can also display process information. It displays the process in the form of a tree. For example, your x system and graphics environment will appear under the display manager that generates the tree process.

Kill

The kill command can kill a process based on its ID. You can use ps-A _ top, or the grep command to get the process ID.

Kill pid

Technically, the kill command can send any signal to a process. You can use kill-KILL or kill-9 to kill stubborn processes.

Pgrep

Given a search keyword, the pgrep command returns all processes ID that match that keyword. For example, you can use the following command to find the PID of Firefox:

Pgrep firefox

You can also combine this with the kill command to kill a specific process. However, it is easier to use pkill or killall.

Pkill & killall

The pkill and killall commands can kill a process based on its name. You can kill the Firefox process using any of the following methods:

Pkill firefox killall firefox

Renice

The renice command is used to change the nice value of the process. The nice value represents the priority of the process. The nice value of-19 is a very high priority, whereas 19 is a very low priority. 0 is the default priority.

Running the renice command requires the ID of the process. The following command allows a process to run at a very low priority.

Renice 19 pid

You can use pregrep and renice together, as shown in the figure above.

If you want to raise the priority of the process, then you need to use root permissions. On the Ubuntu system, use sudo to obtain root permissions:

Sudo renice-19 #

Xkill

The xkill command is a command that can easily kill the graphics level. After running it, your cursor will change to the x symbol. Click on the window of the corresponding graphics program to kill the program. If you want to give up the operation, you can click the right mouse button to cancel.

You don't have to run this command on the terminal-you can press Alt-F2 on the graphical desktop, type xkill, and then press enter to run it. We have bound xkill to hotkeys to make it easier to kill the process.

After reading this article, I believe you have a certain understanding of "what commands you must know in Linux". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!

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