x86: How to Boot a System to Run Level S (Single-User State)

1. 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.

2. Type b -s to boot the system to run level S. Press Return.

   If you do not make a selection within 5 seconds, the system is automatically booted to run level 3.

3. Type the superuser password, if prompted.

4. Verify the system is at run level S by using the who -r command.

   # who -r . run-level S Nov 10 13:59 S 0 3

5. Perform the maintenance task that needed the run level change to S.

6. Press Control-d to bring the system back to run level 3.

x86: Example--Booting a System to Run Level S (Single-User State)

Type any key to reboot
            .
            .
            .
 
                     <<< Current Boot Parameters >>>
Boot path: /eisa/eha@1,4000/sd@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  Aug  4 13:11     S      0  3
(Perform some maintenance task)
# Press <Control-d>