Runlevels

Some Unix runlevel descriptions, here because I can never remember them.
If you brick a host because these descriptions are wrong, then that's your problem. Tell me, though: when I stop laughing, I'll fix the description.

Linux

0
Shutdown.

1
Single user mode.

2 / 3 / 4
Multi user modes. 3 is normal for TTY on RedHat.

5
Multi user mode with X (usually).

6
Reboot.

a / b / c
Pseudo runlevels. Runs scripts for those levels but doesn't change the current runlevel.

Q / q
Reload /etc/inittab.

S / s
Single user mode (not generally used).

Solaris

0
Drop to firmware (OK prompt).

1
Single user mode with local filesystems mounted.

2
Multi user mode.

3
Multi user mode. Export local resources.

4
Alternate multiuser mode (not generally used).

5
Shutdown.

6
Reboot.

a / b / c
Pseudo runlevels. Runs scripts for those levels but doesn't change the current runlevel.

Q / q
Reload /etc/inittab.

S / s
Single user mode. Minimal.

HP-UX

0
Shutdown.

1
Minimal / essential configuration.

2
Multi user mode.

3
Multi user mode. Export local resources.

4
Multi user mode. Export local resources. GUI started.

S
Single user mode.

1 Comments

Ravi said:

Good for new users
thanks for maintaining multiburn

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