Hey
I wanted to get able to shutdown the computer without having to enter my password
so i entered this in /etc/sudoers.de using visudo like on this tutorial http://ubuntuforums.org/showthread.php?t=1132821

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max ALL=(ALL) NOPASSWD:/sbin/shutdown

However I still need to enter my password... Anyone an idea why?

how do call the shutdown command? should be sudo shutdown not shutdown

what is result of command sudo -l ?

Oh okay that works now. I thought that I do not anymore have to write sudo before it since i don't need the password anymore.
I effectively have :

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max@ubuntu:~$ sudo -l
Matching Defaults entries for max on this host:
    env_reset

User max may run the following commands on this host:
    (ALL) ALL
    (ALL) NOPASSWD: /sbin/shutdown

Maybe this will clarify what sudo and su are and how they should be used:
https://wiki.ubuntu.com/RootSudo