Prof. Douglas Comer, author of the Network & OS Books and Creator
of Xinu OS. URL: http://www.cs.purdue.edu/people/comer

One Day One Command
===================

halt — Stop the System.

Summary:

Halt notes that the system is being brought down in the /var/log/wtmp,
file and then either tells the kernel to halt, reboot or poweroff the
system. Halt invoke shutdown, if the system is not in runlevel 0 or 6.

Examples:

# halt — Halt the system.

# halt -f — Force the Halt.

# halt -i — Shutdown the Network interface before Halt.

# halt -p — When Halting the system, Do a Power off.

# poweroff — Same as above.

Read: man halt