topic Re: single user mode in Operating System - HP-UX

single user mode

Radhakrishnan Venkatara — Tue, 27 Nov 2001 05:38:33 GMT

hai all,

i have a query what does single user mode (init 1,S,s) denotes.
the above 3 are denotes single user mode only.As i know some of them init 1 denotes single usermode with all filesystems getting mounted.
IN init s only root get mounted and only sysinit processes of inittab gets excuted.
in init S is same as init s but the difference is your terminal will become the system console (here how does my terminal becomes system console ? what does it mean ? If connected from network ,I will get disconnected while going to single user mode ( there is no networking in single user mode ))
please explain me about this

radhakrishnan

Re: single user mode

Steven Sim Kok Leong — Tue, 27 Nov 2001 05:58:04 GMT

Hi,

One use of single-user modem is when you are performing full system backup such as using HP-UX fbackup, it is preferable to shut the system down to single-user mode so that there are minimal file changes or unflushed files during your backup. This is to preserve file consistency in your backups.

Often, this mode is used for maintenance and troubleshooting since it effectively bars connections from remote users.

Hope this helps. Regards.

Steven Sim Kok Leong
Brainbench MVP for Unix Admin
http://www.brainbench.com

Re: single user mode

Printaporn_1 — Tue, 27 Nov 2001 07:49:15 GMT

just copy form init manpage
If you enter S, boot
init operates as previously described in single-user mode with the
additional result that /dev/syscon is linked to the user's terminal
line, thus making it the logical system console