Summary
The OpenBoot is firmware used to perform basic system operations such as booting the system, running hardware diagnostics, and storing boot-related parameters in NVRAM.
OpenBoot commands such as banner and printenv are used to display NVRAM parameters. The setenv, set-default parameter, and set-defaults commands are used to set NVRAM parameters.
The eight run levels are 0 (power down), s (single user), 1 (administrative), 2 (multiuser without NFS server (NFS client only)), 3 (multiuser with NFS server), 4 (not used), 5 (power down), and 6 (reboot). The init command supports changing to any run level, whereas the shutdown command can be used change to run levels 0, 1, 5, 6, and s.
The /etc/inittab file contains information on which programs ...
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