Mac OS X can experience difficulty deleting certain files due to the following (and other) reasons: The file is in use by an application or system process The file is locked. Option + Right Click on an apps icon in the Dock to bring up the “Force Quit” option, selecting this will kill the app without any confirmation. 4) Force Quit an App from the Apple Menu Hold the Shift Key and click on the Apple menu to find “Force Quit Application Name”. I have strange problem, my Preview app is not responding and can't kill it. Leo-mac: leo$ sudo killall Preview No matching processes were found Force Quit button also doesn't give any result. Ps (and Activity Monitor) is empty: leo-mac: leo$ ps -ax grep -i preview 24793 ttys000 0:00.00 grep -i preview.
You can use Activity Monitor to quit a process, even if it’s in a loop or not responding. You can also send a signal to a process to terminate it. If you attempt to quit a process you don’t own, you may be required to authenticate as an administrator.
In the Activity Monitor app on your Mac, under the Process Name list, select the app or process you want to quit. An unresponsive process is marked with (Not Responding).
Note: The Process Name list is not available in the Cache page.
Click the Force Quit button in the upper-left corner of the Activity Monitor window (or use the Touch Bar).
Choose one of the following options:
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Quit: This is the same as choosing File > Quit within an app. The process quits when it’s safe to do so. If quitting the process could cause data loss or interfere with another app, the process doesn’t quit.
Force Quit: The process quits immediately. If the process has files open, you may lose data. If the process is used by other apps or processes, those apps or processes could experience problems.
To see if a process is used by another process, choose View > All Processes, Hierarchically.
To send a signal to a process, select it in the process list, choose View > Send Signal to Process, choose a signal from the pop-up menu, then click Send.