CHAPTER 6 Startup and Shutdown

6.2 Run Levels (SunOS 5.X, IRIX 5.X)

Solaris 2 and IRIX 5.X have eight run levels, 0-6,s or S. The following table identifies the modes for these run levels.

System Run Levels
Run Level Function Command
0 PROM monitor level (power-down) init 0, shutdown -i0, halt
1,S,s Single-user mode init 1, shutdown -i1
2 Multi-user mode, NO resources shared init 2, shutdown -i2
3 Multi-user mode, resources shared init 3, shutdown -i3
4 Alternative multi-user mode (not currently used)
5 Halt and software Poweroff the system init 5, shutdown -i5
6 Halt and reboot to default state init 6, shutdown -i6, reboot

System Run Levels
Run Level	Function	Command
0	PROM monitor level (power-down)	init 0, shutdown -i0, halt
1,S,s	Single-user mode	init 1, shutdown -i1
2	Multi-user mode, NO resources shared	init 2, shutdown -i2
3	Multi-user mode, resources shared	init 3, shutdown -i3
4	Alternative multi-user mode (not currently used)
5	Halt and software Poweroff the system	init 5, shutdown -i5
6	Halt and reboot to default state	init 6, shutdown -i6, reboot

You can determine the current run state with the command

# who -r

. run-level 3 Feb 22 08:54 3 0 S

Additionally, init responds to the q or Q run levels, which cause init to reread /etc/inittab.

Digital UNIX has run levels 0,2,3,q,s.

Unix System Administration - 8 AUG 1996

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