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How can I kill the currently active window with a command or keyboard shortcut?

Alt+F4 closes a window, but first it will wait for the program to respond. Depending on the application, this may take several minutes. I am specifically interested in a solution with no waiting period -- that is, a solution that takes effect instantly.

I want to immediately kill the currently focused window with a shortcut.

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up vote 4 down vote accepted

Use xdotool to kill the currently active window:

xdotool getwindowfocus windowkill

On Ubuntu, make a keyboard shortcut:

  1. Open Keyboard settings (shown below).
  2. Create a shortcut with the command: xdotool getwindowfocus windowkill

I chose: Ctrl+Alt+x

This shortcut will kill the currently active window immediately. It will not wait for the application to respond, terminate, save, close files, finish up, etc.

Keyboard Settings

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I think you are looking for xkill.

Start it in a shell, then click on the offending window.

Alternatively, you can do Alt-F4 and wait - then you will be asked

the program is not responding - terminate it? (you will lose unsaved work)
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Thanks for the answer! I would prefer to use a keyboard shortcut instead of opening a shell, typing a command, and then using my mouse to find the window. When I open a shell, it might overlap or hide the offending window. I think it's much easier to use a shortcut. – Kamil Slowikowski May 22 '14 at 15:33
In that case you should use Alt-F4 or click on the "x" in the upper right(or left) corner. After a while, you will be asked the "terminate it?" question. – sds May 22 '14 at 15:40
In theory, you're right. In practice, I don't have time to wait for the application to respond. Sometimes it takes minutes before such a "terminate it?" question pops up. After clicking "terminate it" then I have to wait even longer. I'm looking specifically for a solution that avoids waiting. – Kamil Slowikowski May 22 '14 at 20:25
It is far too easy to "mis-click", so such a dangerous action as killing an application will never be easy. – sds May 22 '14 at 20:55
what about ctrl+q? That closes the active window (i guess with signal SIGTERM). On Windows is ctrl+w. – erm3nda May 22 '15 at 8:35

The default kill-window shortcut for me in KDE is Ctrl+Alt+Esc

enter image description here

(There's a separate Alt+F4 "close window" entry)

System Settings -> Shortcuts and Gestures -> Global Keyboard Shortcuts -> KWin

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