uadmin

Commands you should never run unless all else fails!

uadmin 2 0 – sync the filesystems and drops system to ok prompt
uadmin 2 1 – sync the filesystems and reboots to multi-user mode
uadmin 2 2 – sync the filesystems and reboots interactively
uadmin 2 3 – sync the filesystems and reboots to single-user mode
uadmin 2 6 – sync the filesystems and powers off the system

uadmin 1 0 – do not sync filesystems and drops system to ok promptĀ 
uadmin 1 1 – do not sync filesystems and reboots to multi-user mode
uadmin 1 2 – do not sync filesystems and reboots interactively
uadmin 1 3 – do not sync filesystems and reboots to single-user mode
uadmin 1 6 – do not sync filesystems and powers off the system