Shuting computer down in bash shell
 

Is there a bash command that shuts the computer down? like the command reboot for rebooting the system?

Take your pick. See man pages:
shutdown
halt
poweroff

shutdown -h now

zdravo zWaR oz Uroš jan tu :)). You can try also as super user this command /sbin/init 0

:)

You generally need to be root to execute the shutdown command, unless you change it's permissions/setup sudo.

the path is /sbin/shutdown

so as root /sbin/shutdown -r now - reboots
/sbin/shutdown -h now - shutsdown

or use sudo, the now switch can also be changed to give a timed reboot etc.