Stop an application in linux

Force quit an App on Linux With Commands

You can use multiple command lines in Linux to manage the system processes. Additionally, some commands such as xkill , killall , and htop make it very easy to terminate the process in a go. We will go through some of these CLI tools you can use in Linux to force quit an app.

Before using the commands for the force stop, it is necessary to know about the process id. Each running process on Linux has an id you can use while terminating it. In order to determine the process id, you can use the pidof command. Use the syntax with the following format, along with its use case and output as shown in the screenshot.
pidof

If you are unaware of the exact process name, use the ps command to determine it.
ps aux | grep -i

Using Xkill

If you use the xkill feature, it will change the mouse cursor to X, which you can place over an application window and click on it to end its processes. Earlier, we mentioned a process to map the keyboard to activate the xkill command. However, you can also use this command from the terminal. Follow these steps to use it.

1. Press Ctrl + Alt + T to launch the terminal.
2. Type xkill and hit enter. The mouse cursor will now change to X.
3. Take the cursor over any point of the application window you want to force quit and click on it.
4. Finally, the application process will stop in the system.

Note: The xkill command is not installed by default on Linux and only works on Xorg sessions. You would have to install it using the package manager. Use this command to install it. sudo apt-get install xorg-xkill

Using Kill command

Kill command is a useful tool to terminate the system processes or applications running on Linux. The kill command uses the process id of the application and signals it to terminate the processes from the system.

Here is the syntax for the command, along with its use case in the screenshot.
sudo kill -9

If you have multiple processes to close, you can enter their process id into the single kill command line to force stop them at once. Here is the syntax for it.
sudo kill -9 < processid3>

Using Killall

If you know the application’s process name, you can directly use the killall command to terminate the application from the system. Use this syntax for it.
killall

Using Htop

htop is the command line that lets users monitor the terminal’s system processes and manage them. The latest alternative to the top command allows you to force quit the application and processes in the Linux OS quite efficiently. To use the htop command line, follow these steps;

1. First of all, install the htop using the package manager if it isn’t already installed.
   sudo apt-get install htop

1. Now, execute the command htop
2. Select the process you want to stop the process.
3. Then press F9. You will get options for sending the kill signals.
4. Select SIGKILL and press enter.

   Nishant is an enthusiast who loves writing about technology. He also is heavily invested in keeping himself updated about the latest happenings in the tech world. At Tech News Today, he covers Operating Systems, how-to-topics, and Fixes.

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   How to Stop a Program in Linux Terminal

   It’s amusing how the simplest of the things like stopping a running program could be overwhelming when you are new to the Linux command line.

   It’s amusing how the simplest of things could be complicated when you are new to something. The other day, I found my friend could not figure out how to exit the top command. Instead of stopping the command, he closed the entire terminal application. That’s not only unnecessary, but it is also a not good thing to do.

   Stopping programs in Linux

   

   In Linux, you can use the Ctrl+C keys to stop a running program in the terminal. This works for Ubuntu as well as any other Linux distribution. Take the ping command for example. If you do not stop it, it will keep on displaying the result. Hold the Ctrl button and press the C key at the same time. It sends the SIGKILL signal to the running program to force quit the command. Do you see the ^C? The caret (^) means Ctrl. So basically, the terminal shows the Ctrl+C keystrokes as ^C. The Ctrl+C works very well for the commands designed to keep running until interrupted. You feel like you have to cancel the command, use Ctrl+C. You can find the process ID and kill a running process in a more complicated method. That’s more advanced stuff and used only when the process is running in the background or by another user or in another terminal window. Apart from that, some other commands and command line tools have their own exit commands. Let me briefly mention some of them here.

   How to exit Vim editor

   

   Existing Vim editor has made so many jokes in the Linux world. It is difficult to figure out when you are new to this powerful command line based text editor. Among several ways of quitting vim, the most common is to press the Esc key and then type a colon (:) and then type q! for force quit without save or wq for save and quit.

   How to exit Nano editor

   

   Quitting the Nano editor is a bit simpler than exiting Vim. Why? Because Nano mentions the shortcut at the bottom. You may not understand it if you are new to it but at least you’ll be able to figure it out the next time. To exit Nano, press Ctrl+X. It will ask if you want to save the changes made to the file or not. You can enter your choice.

   How to exit less command

   The less is an excellent command that lets you view without cluttering your terminal screen like the cat command. If you are inside the less command view, use the key q to exit less.

   How to exit the terminal

   To exit the terminal itself, instead of closing the terminal, either use Ctrl+D keyboard shortcut or type the exit command:

   This actually exists you from the current shell. When you open a terminal in Ubuntu or any other Linux distribution, it runs the default shell. When you exit from this shell, terminal ends as well. Ctrl+D is the shortcut to do the same and quit the terminal. I hope you find this quick tutorial helpful. I highly recommend learning these Linux command tips.

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