I've a question about restart / shutdown my Fedora system using the terminal.

when I'm not using X, i can simply type "shutdown -r now" to restart my computer
but when i'm using X and typed the same thing under the terminal...
it said "bash: shutdown: command not found" Why ???

Also, the command "Service" seem not to work under the terminal
For example, when I'm not using X, i can type "Service iptables start" to start firewall
but when i'm using X and typed the same thing
it said "bash: service: command not found"


What exactly is "bash" ?

Problem is /sbin and /usr/sbin is not in the path when you 'su', there's several solutions
execute the commands using absolute paths, eg
use 'su -' instead of 'su'

or add the paths to /root/.bashrc

thx for the link, but i need some quick solution (no time to read all those text)
is there a way to restart my system using command ?
like what should i type in the terminal ?

thx a lot

Demonbane, thx for the quick and accurate answer
no proprietary support can be as fast as our open source community.
amazing!