Single user mode in HP UX

[Sunny Anthony]

How to go into single user mode in HP UX

[Luk Vandenbussche]

Hi,

Interrupt the boot sequence

BO Pri

Interact with IPL : Y

> HPUX -is (at boot prompt)

[Alex Georgiev]

Or just use the shutdown command with no arguments.

That will take you from a fully running system to single user mode.

[Arunvijai_4]

Login to GSP or MP prompt

GSL or MP > hpux -iS will get into to single user mode.

-Arun

[Sivakumar TS · Accepted solution]

Dear Sunny,

the ways...

1. execute #shutdown -y 0

(by default goes to sinle user mode )

2. execute #init s



During bootime...

interact with ISL

and at ISL> prompt

3. execute hpux -is

With Regards,

Siva.

[Senthil Prabu.S_1]

Hi,

[A]. Loging to the machine,
# init S or init s
will bring it to single-userm mode.

[B], while bootup

Press ESC to stop the auto-boot.
When the list of boot devices is presented:

b PX ISL (where X is your root disc)

And at the ISL> prompt:

HP-UX9.x: ISL> hpux -iS disc(;0)/hp-ux
HP-UX-10.x: ISL> hpux -iS disc(;0)/stand/vmunix

The '-iS' are the flags to init which says come up single user. The rest
of the command is what the bootprocess does automatically.

HTH,
Prabu.S

[Muthukumar_5]

Simply init S or init s will send you to single user mode. Else stop at prompt and give as,

boot>hpux -is

will lead to single user mode.

-Muthu

[Cem Tugrul]

http://docs.hp.com/en/5991-1237/ch05s09.html#aes-npar-329a

[Bill Hassell]

Just a note about shutdown with no -r or -h option: under several circumstances, this will not be a clean single user mode. And init s will never enter single user mode despite the man pages. shutdown 0 or shutdown -y 0 is a quick way to bypass (sometimes very long) processor selftests but occasionally you'll find network daemons still running and some filesystems like /var and /usr still mounted. True single user mode is defined as no filesystems mounted except / and /stand, and the absolute minimum kernel processes running. This is only consistently reached with a complete reboot and intgeracting with ISL using the hpux -is command.