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I found xkill on dashboard accidentally and my pointer turned into an x sign on clicking it. It doesn't change back when I press esc.

What does this x sign stand for and what does it do?

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    @Melebius I didn't even find one similarity, how can I tell different are both question. There is not a single word about xkill. – M.A.K. Ripon Oct 13 '18 at 3:57
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    Please let's not close clear specific questions against very generic ones that don't cover the topic... – Zanna Oct 13 '18 at 15:33
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xkill is a utility used for force-quitting GUI apps. It is handy when some app isn't responding or is causing your system to work abnormally.

NAME

xkill - kill a client by its X resource

DESCRIPTION

Xkill is a utility for forcing the X server to close connections to clients. This program is very dangerous, but is useful for aborting programs that have displayed undesired windows on a user's screen. If no resource identifier is given with -id, xkill will display a special cursor as a prompt for the user to select a window to be killed. If a pointer button is pressed over a non-root window, the server will close its connection to the client that created the window.

To use it quickly you can use Alt+F2 and enter xkill and hit Enter. Alternatively, you can also type the same in Terminal. You can also define a keyboard shortcut in Settings → Devices → Keyboard to use xkill.

Your cursor will turn into cross sign and forcefully terminate (finishes the game (what I think) of) the app.

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    I have it assigned to a shortcut. Handy for killing unresponsive app windows – Sergiy Kolodyazhnyy Oct 6 '18 at 20:16
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    @SergiyKolodyazhnyy Added about that also :-) – Kulfy Oct 6 '18 at 20:24

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