Xkill is a utility program distributed with the X Window System that instructs the X server to forcefully terminate its connection to a client, thus "killing" the client. When run with no command-line arguments, the program displays a special cursor (usually a crosshair or a skull and crossbones) and displays a message such as Select the window whose client you wish to kill with button 1 ...
Xkill is a utility program distributed with the X Window System that instructs the X server to forcefully terminate its connection to a client, thus "killing" the client. When run with no command-line arguments, the program displays a special cursor (usually a crosshair or a skull and crossbones) and displays a message such as Select the window whose client you wish to kill with button 1 ...
Source: Wikipedia "Xkill" · CC BY-SA 4.0
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