FreeBSD shutdown restart command

The author is now self-study freebsd system, has successfully installed the freebsd system in the computer VM virtual, but many are not very familiar, that is, even the most basic freebsd system shutdown or restart command is anything I don't know, I finally found out that his centos system is somewhat similar.
Demo System Notes

Demonstration System: FreeBSD9.1

Note: Freebsd shutdown or restart command can only be successfully executed by using the root user to log in. The normal user in SSH fails to execute. When the reboot or shutdown is performed, it will prompt “Shutdown: Permission denied”, which means that the shutdown permission is rejected by the system.
freebsd shutdown command

Step 1: Log in to the FreeBSD system using the root administrator on this machine.

Step 2: After successful login, directly “shutdown -p now” command and make sure that the FreeBSD system can be shut down.

Computer Repair Technology Network Note: The shutdown -p now command shuts down FreeBSD and turns off the power.

There is also a command for “shutdown -h now” is also FreeBSD shutdown, but does not turn off the power.
freebsd restart command

Step 1: Log in to the FreeBSD system using the root administrator on this machine.

Step 2: After successful login, execute “shutdown -r now” and make sure that the FreeBSD system can be restarted.