I'm looking for an auto shutdown app that will forcefully shut down the computer at an appointed time.
The most important part of this is that the shutdown should not be cancelable (unless the process is extremely onerous).
Ok, so further to my previous answer, I can walk you through getting cron (a built in UNIX schedule service) to run a scheduled shutdown command for you.
It will run as root and will be forced.
sudo crontab -e
You'll need to enter your login password and then press enter.
You'll now be in a text editor (vim). Carefully input the following keystrokes.
Let's say you want the machine to shutdown at 2am every day, we'd now enter:
* 2 * * * /sbin/shutdown -h now
If you wanted the machine to shutdown at 2:30am every day, you'd enter:
30 2 * * * /sbin/shutdown -h now
You should now be dropped back to the command line where you started.
It can be canceled though:
shutdown -h 1109211555
Halt in 4 minutes:
shutdown -h +4
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>me.lri.forceshutdown</string> <key>ProgramArguments</key> <array> <string>shutdown</string> <string>-h</string> <string>now</string> </array> <key>StartCalendarInterval</key> <dict> <key>Hour</key> <integer>23</integer> <key>Minute</key> <integer>0</integer> </dict> </dict> </plist>
If the plist was owned by a normal user, trying to load it would result in the error
launchctl: Dubious ownership on file (skipping):
sudo chown root /Library/LaunchAgents/me.lri.forceshutdown.plist
The agent can be loaded by logging out and back in, or with:
sudo launchctl load /Library/LaunchAgents/me.lri.forceshutdown.plist
sudo crontab -e
`08 16 * * * /sbin/shutdown -h now`
This would perform a normal non-forced shut down:
osascript -e 'tell app "System Events" to shut down'
This can be scheduled in System Preferences > Energy Saver > Schedule. I'm not certain that this will initiate a forced shutdown, you'd have to try it out. But that's a built in option to automate scheduled power down/up.
You can also forcibly shutdown the system with a terminal command (requires root):
shutdown -h now
You could put that command into a launchd or cron scheduled task. Check out this article for far more info on those two services.
You may also want to check out an application like the aptly named iWannaSleep (not sure if this forces shutdown).
You can use
shutdown directly to schedule a shutdown at any given time in the future:
shutdown -h time
where time specifies a future time in one of two formats: +number, or yymmddhhmm, where the year, month, and day may be defaulted to the current system values. The first form brings the system down in number minutes and the second at the absolute time specified.
cd ~/Downloads/ curl --remote-name http://dl.dropbox.com/u/18414/ase/com.tjluoma.forceshutdown.plist
# see note below
sudo mv com.tjluoma.forceshutdown.plist /Library/LaunchAgents sudo chown root:wheel /Library/LaunchAgents/com.tjluoma.forceshutdown.plist sudo launchctl load /Library/LaunchAgents/com.tjluoma.forceshutdown.plist
As written, the plist will cause the computer to be shutdown at 11pm (local time) every day.
If you want to change the time, edit the script in any text editor. Change the Hour and Minute keys, excerpted here:
<dict> <key>Hour</key> <integer>23</integer> <key>Minute</key> <integer>0</integer> </dict>
(note the use of 24-hour time)
It is very difficult for a rogue application or process to block these steps.
shutdown will force quit all processes on your Mac, including graphical applications. For many applications this is aggressive behaviour and does not provide the application with much opportunity to save state or data.
Power Manager includes a Schedule Assistant task for shutting down to a schedule.
Disclosure: I work with the company who make Power Manager.
I'd take a look at this tech note by Apple