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If the process is yours, you can use either kill (ie kill -signal PID) or pkill (ie pkill -signal pname). Try to send as nice a signal as possible. Some people like to jump right to -9, but this may not be appropriate in all circumstances. If the process is not yours, you will need to get proper access via su or sudo.
if you are running a process from console or terminal you can obtain the list of PID by typing:
jobs -l
or if you are using kde u can kill an running application by pressing
Ctrl + Alt + Esc
a skull is gonna appear instead of the normal cursor, just click on top of the application you want to kill. A rude way but thats the only way i found to kill apps (im sure there must be a better way, i just dont know how, lol)
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