Adjust Whether a Mac Restarts Automatically on System Freeze
sudo systemsetup -getrestartfreezeYou’ll either see one of two reports, indicating the status of the feature:
Restart After Freeze: On
or:
Restart After Freeze: Off
Again, the default Mac setting now is to be “On” – it is highly recommended to leave that setting enabled as is and not adjust it.
Adjusting the Automatic Mac Restart Upon Freeze Feature
If you’re advanced user and you wish to toggle the auto-restart on freeze feature, the following command syntax will do so. Adjust the ‘on’ or ‘off’ component of the command to achieve the desired effect:
Turn automatic restarting upon freeze on:
sudo systemsetup -setrestartfreeze on
Turn automatic restarting upon freeze off:
sudo systemsetup -setrestartfreeze off
Keep in mind if you turn this feature off, an unattended frozen Mac will stay frozen at whatever is on screen for however long it takes a user to come an force the computer to reboot, if not for some other power event taking place. This is one of many reasons why the average user should leave the setting turned on.
Even with the automatic restart on freeze feature left enabled, sometimes, a frozen Mac can be so stuck that it requires forcibly rebooting to get the computer to behave again.
Note this setting was actually contained in the System Preferences for a while in earlier versions of OS X, but newer versions of Mac OS X removed the option and instead simply default to having the feature on.
systemsetup Help Information
-------------------------------------
Usage: systemsetup -getdate
Display current date.
Usage: systemsetup -setdate <mm:dd:yy>
Set current date to <mm:dd:yy>.
Usage: systemsetup -gettime
Display current time.
Usage: systemsetup -settime <hh:mm:ss>
Set current time to <hh:mm:ss>.
Usage: systemsetup -gettimezone
Display current time zone.
Usage: systemsetup -settimezone <timezone>
Set current time zone to <timezone>. Use "-listtimezones" to list time zones.
Usage: systemsetup -listtimezones
List time zones supported by this machine.
Usage: systemsetup -getusingnetworktime
Display whether network time is on or off.
Usage: systemsetup -setusingnetworktime <on off>
Set using network time to either <on> or <off>.
Usage: systemsetup -getnetworktimeserver
Display network time server.
Usage: systemsetup -setnetworktimeserver <timeserver>
Set network time server to <timeserver>.
Usage: systemsetup -getsleep
Display amount of idle time until computer, display and hard disk sleep.
Usage: systemsetup -setsleep <minutes>
Set amount of idle time until computer, display and hard disk sleep to <minutes>.
Specify "Never" or "Off" for never.
Usage: systemsetup -getcomputersleep
Display amount of idle time until computer sleeps.
Usage: systemsetup -setcomputersleep <minutes>
Set amount of idle time until compputer sleeps to <minutes>.
Specify "Never" or "Off" for never.
Usage: systemsetup -getdisplaysleep
Display amount of idle time until display sleeps.
Usage: systemsetup -setdisplaysleep <minutes>
Set amount of idle time until display sleeps to <minutes>.
Specify "Never" or "Off" for never.
Usage: systemsetup -getharddisksleep
Display amount of idle time until hard disk sleeps.
Usage: systemsetup -setharddisksleep <minutes>
Set amount of idle time until hard disk sleeps to <minutes>.
Specify "Never" or "Off" for never.
Usage: systemsetup -getwakeonmodem
Display whether wake on modem is on or off.
Usage: systemsetup -setwakeonmodem <on off>
Set wake on modem to either <on> or <off>.
Usage: systemsetup -getwakeonnetworkaccess
Display whether wake on network access is on or off.
Usage: systemsetup -setwakeonnetworkaccess <on off>
Set wake on network access to either <on> or <off>.
Usage: systemsetup -getrestartpowerfailure
Display whether restart on power failure is on or off.
Usage: systemsetup -setrestartpowerfailure <on off>
Set restart on power failure to either <on> or <off>.
Usage: systemsetup -getrestartfreeze
Display whether restart on freeze is on or off.
Usage: systemsetup -setrestartfreeze <on off>
Set restart on freeze to either <on> or <off>.
Usage: systemsetup -getallowpowerbuttontosleepcomputer
Display whether the power button is able to sleep the computer.
Usage: systemsetup -setallowpowerbuttontosleepcomputer <on off>
Enable or disable whether the power button can sleep the computer.
Usage: systemsetup -getremotelogin
Display whether remote login is on or off.
Usage: systemsetup -setremotelogin <on off>
Set remote login to either <on> or <off>. Use "systemsetup -f -setremotelogin off" to suppress prompting when turning remote login off. Requires Full Disk Access privileges.
Usage: systemsetup -getremoteappleevents
Display whether remote apple events are on or off.
Usage: systemsetup -setremoteappleevents <on off>
Set remote apple events to either <on> or <off>. Requires Full Disk Access privileges.
Usage: systemsetup -getcomputername
Display computer name.
Usage: systemsetup -setcomputername <computername>
Set computer name to <computername>.
Usage: systemsetup -getlocalsubnetname
Display local subnet name.
Usage: systemsetup -setlocalsubnetname <name>
Set local subnet name to <name>.
Usage: systemsetup -getstartupdisk
Display current startup disk.
Usage: systemsetup -setstartupdisk <disk>
Set current startup disk to <disk>.
Usage: systemsetup -liststartupdisks
List startup disks on this machine.
Usage: systemsetup -getwaitforstartupafterpowerfailure
Get the number of seconds after which the computer will start up after a power failure.
Usage: systemsetup -setwaitforstartupafterpowerfailure <seconds>
Set the number of seconds after which the computer will start up after a power failure. The <seconds> value must be a multiple of 30 seconds.
Usage: systemsetup -getdisablekeyboardwhenenclosurelockisengaged
Get whether or not the keyboard should be disabled when the X Serve enclosure lock is engaged.
Usage: systemsetup -setdisablekeyboardwhenenclosurelockisengaged <yes no>
Set whether or not the keyboard should be disabled when the X Serve enclosure lock is engaged.
Usage: systemsetup -version
Display version of systemsetup tool.
Usage: systemsetup -help
Display help.
Usage: systemsetup -printCommands
Display commands.
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