Press any key to reboot the system if the system displays the Type any key to reboot prompt. You can also use the reset button at this prompt. If the system is shut down, turn the system on with the power (on/off) switch.
The Current Boot Parameters menu is displayed after a few minutes.
If you do not make a selection within five seconds, the system is automatically booted to run level 3.
Type the superuser password, if prompted.
Verify the system is at run level S by using the who -r command.
# who -r . run-level S Jul 19 14:37 S 0 3
Perform the maintenance task that needed the run level change to S.
Press Control-d to bring the system back to run level 3.
Type any key to reboot . . . <<< Current Boot Parameters >>> Boot path: /pci@0,0/pci-ide@7,1/ide@0/cmdk@0,0:a Boot args: Type b [file-name] [boot-flags] <ENTER> to boot with options or i <ENTER> to enter boot interpreter or <ENTER> to boot with defaults <<< timeout in 5 seconds >>> Select (b)oot or (i)nterpreter: b -s . . . INIT: SINGLE USER MODE Type Ctrl-d to proceed with normal startup, (or give root password for system maintenance): xxx Entering System Maintenance Mode . . . # who -r . run-level S Jul 19 14:37 S 0 3 (Perform some maintenance task) # Press <Control-d>