If I  remember correctly in MAndrake you need to be root to execute 
this  command. You need to use shutdown now -h as root.

Brett Conrad wrote:

>Hello!
>
>How do I shut down and/or reboot Mandrake 10.1 Community Edition? I'm
>running KDE 3.2. 
>
>The Linux book I am reading says there is a "shutdown" command, but it
>doesn't work in the terminal window. "Command not found" When I log out,
>there is a Reboot button, but it is greyed out. Same with the Halt
>button.
>
>I've learned a lot since installing Linux four days ago, but I haven't
>solved this one yet.
>
>Thank you in advance.
>
>Regards,
>
>Brett
>
>
>--
>"It is the mark of an educated mind to be able to entertain a thought without accepting it."
>-Aristotle
>
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