System Shutdown and Restart

Although it's not often necessary, you may find a reason to occasionally restart or shut down your server. Table A.15 contains these commands.

Table A.15. Commands for Changing the State of the System

COMMAND	GENERAL USAGE	DESCRIPTION
halt	halt	Shuts down the computer.
init	init [RUNLEVEL]	Changes the current runlevel to the specified runlevel. Possible runlevels are
		0	System halt
		1,S,s	Single-user mode
		2	Local multiuser, minimal networking
		3	Full multiuser with networking
		4	Not used
		5	Full multiuser with networking and graphical environment
		6	System reboot
reboot	reboot	Restarts the computer.
runlevel	runlevel	Displays previous and current runlevel. (If the previous runlevel is N, runlevel has not been switched since startup.)
shutdown	shutdown [OPTIONS] time	Used to shut down or restart a Linux machine. Common options include -h Halt, or shut down computer -r Reboot computer For example: shutdown -h now