shutdown [shutdown parameter]

[root@sylixos:/root]# help shutdown       
shutdown this computer.
-r    shutdown & reboot
-f    force shutdown & reboot
-h    shutdown this computer
no parameter means shutdown only
shutdown [shutdown parameter]
[root@sylixos:/root]# 

[root@sylixos:/root]# shutdown
[shutdown]Shutdown...
kernel rebooting...
kernel rebooting down.

[root@sylixos:/root]# shutdown -r
[shutdown]Shutdown & reboot...
kernel rebooting...
kernel rebooting down.