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Possibly recover from a freeze without a reboot
This sort of this has happened to me a few times, thankfully its very infrequent. I log in to the locked up machine via another of my Macs using ssh (enabled on all my Macs via System Preferences -> Sharing -> Services, the check "Remote Login").
Possibly recover from a freeze without a reboot
Why would shutdown -r from a remote machine be preferable to rebooting with the power key?
Possibly recover from a freeze without a reboot
Because it would be a "safe" restart instead of a "hard" restart (holding power button).
Possibly recover from a freeze without a reboot
Good question. From the man pages for
It doesn't mention anything about cleanly shutting down. But if you look at the man pages for
Whether or not this informs the WindowServer process, isn't directly alluded to. But I'm sure it gets the message.
Possibly recover from a freeze without a reboot
I have used ssh to get into a frozen mac but often you do not have to do a reboot. If you run the unix command "top" you can see which applications are running. If one is causing the freeze-up it will often show a huge cpu usage. Killing that process will often free up the computer.
Here are the commands:
Possibly recover from a freeze without a reboot
Most people won't need to get the pid's, but can just use killall. For example to kill the Finder, do
This could cause trouble on a multi user machine, so be careful if other people are logged in. On the other hand if your desktop is frozen, odds are all other processes are frozen too...
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