How to kill applications
I have been playing around with Ubuntu installing new themes and and docks. Sometimes during the installation, whole screen just hangs. What is the best way in Ubuntu to Kill a process/application? Anything similar to Ctrl + Alt + Del of windows?
In System->Admin you have an application called System Monitor, this is the equivalent of the windows task manager.
Edit: for later versions of Ubuntu (writing this on a PC running
13.10), you will find the system monitor through the dash (top left). Just type
system monitor or parts of it in the dash and look for the System Monitor application..
Not quite like CtrlAltDel of Windows, but you can also kill with
xkill. Just go to the “run” dialog (Alt+F2), type in
xkill and your mouse pointer will change to an “x”. Point on the application that you want to kill and click, and it’ll be killed. Can sometimes be much quicker than loading the System Monitor.
Firstly you should know the PID of the application you want to kill.
you can use
ps to get this.
ps aux | grep "$appName" | grep -v 'grep'
kill.(Ensure you have the privilege to kill it.)
If your screen hangs, you can switch to virtual console (Alt-Ctrl-F1), login with your user, type top, detect CPU eating process, and then run skill process_name. If it is system (root) process, use sudo skill process_name
You can also restart X.Type Ctrl+Alt+Backspace
In ubuntu 10.04 these keys will be disabled by default.To enable it,
Select the Layouts tab and click on the Options button.
Select Key sequence to kill the X server and enable Control + Alt + Backspace.
You can use tty by pressing Ctrl+ Alt+ F2 and then login and run following command:-
kill -9 -1
kill -9 -1 Kill all processes you can kill.
This will return to login screen and after login all process works freshly.
This is my personal list of killing:
kill 8888effect: kill application that has PID 8888.
kill -9 <pid_number>example:
kill -9 8888effect: same with above but more extreme and forceful.
killall firefoxeffect: kill application or application instance that has name firefox. You don’t have to know PID number, and this is my most favorite.
kill -9 -1effect: kill all processes including X Server so you can go back to display manager (LightDM, GDM, or KDM). Another name for this command is relogin. And this command is a substution for clicking Log Out button.
Alt+Printscreen+REISUBeffect: force restart; same with Ctrl+Alt+Del in Windows. It is very useful to avoid HDD damage.
Alt+Printscreen+REISUOeffect: force shutdown, like Ctrl+Alt+Del but do shutdown instead of restart. Only differ 1 last char (O and B).
xkilleffect: change your pointer to skull. If you click a GUI Windows with that, the Window will definitely be die.
You can see PID of a process by commands
top, htop, or graphically by GNOME System Monitor.
Also a quick hot key combination using GUI method works with my Ubuntu 14.04 (xfce) just press Ctrl+Alt+Esc and an
xkill cursor should appear, just click on an application to kill.
Open the terminal and type:
<application_name> is replaced by the name of the application in the command which is used to start the application from the terminal. If you don’t know the process name of an application you can look it up in the System Monitor.