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How to use the rescue mode,
Nico Schottelius 2005-06-13 (Last Modified: 2005-06-13)
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cinit knows of a so called "rescue mode" (other init systems also
name it "Single user").

In this rescue mode you have a shell. Exactly one shell.

No getty, no daemon, nothing will be alive, not even cinit.

You start the rescue mode either by
   a) sending SIGUSR2 to cinit (kill -USR2 1)
   b) using cservice (cservice -s thilo)

You can do maintaining then. When you finished, you can either
   a) hard-reboot/poweroff/halt
   b) restart cinit and restart the system without needing to reboot

In the later case, you simply have to replace your shell with
cinit. In most shells you can do that by entering the following:

shell # exec /sbin/cinit

This assumes that you left the system in a clean state: Exactly as
the kernel would start (Well, cinit may ignore if some things are there,
but do not wonder if some services will fail, if their job is already done.).

Oh, and yes, you could even update cinit this way ;-)