Installation guide

on these entries before it continues with the normal processing of the
inittab file. The init process next scans the file for other entries with
processes that are allowed to run at the new run level, and then acts on
these entries.
3.5.2 Changing Run Levels from Multiuser Mode
When the system is running at one of the two multiuser run levels, you can
use the init command to change run levels. To use the command, log in as
root and use the following syntax:
init
[ 0| s| 2 |3| q]
The init command invokes the following run levels:
0
Specifies the halt state
s
Specifies the single-user run level
2
Specifies a multiuser run level with local processes and daemons
3
Specifies a multiuser run level with remote processes and daemons
q
Specifies that init should reexamine the inittab file
3.5.2.1 Changing to a Different Multiuser Run Level
To change from the current multiuser run level to a different multiuser run
level, enter the init command with the argument that corresponds to the
run level that you want to enter. For example, to change from run level 2 to
run level 3, enter the following command:
# init 3
In response to your entry, init reads the inittab file and follows the
instructions that correspond to the change in run level.
3.5.2.2 Changing to Single-User Mode
The init command provides a way to change from the current multiuser
mode to single-user mode by using the s run level argument. For example,
to change from the current run level to single-user mode, enter:
# init s
To change from a multiuser mode to single-user mode, giving users a
10-minute warning, enter:
# /usr/sbin/shutdown +10 Bringing system down to single-user for testing
3–12 Starting Up and Shutting Down the System