Command lines to create new ubuntu users?

[Charlie Zender]

Hi,

How do I create fully Ubuntu user accounts with a traditional UNIX
'useradd' command? When I add new users via the Kubuntu
system/users&groups menu-driven interface, the users have, by default,
full access to the system hardware such as the sound interface.
But new users whom I add with the command-line 'useradd' command,
e.g.,

sudo useradd -c 'User' -d /home/user -g group -m -u userid user

do not have access to, e.g., the computer sound chip.
For example, they cannot start the audio mixer kmix.

I think there should be a command line equivalent to all GUI actions,
so what command-line programs and switches (e.g., useradd) will create
the same 'user priveleges' (sound devices, CD access, etc.) for new
users as the menu-driven interface?.

Thanks,
Charlie
-- 
Charlie Zender, Department of Earth System Science, UC Irvine
Sab. at CNRS/LGGE-Grenoble until 20080715 :) 011+33+476+824236
Laboratoire de Glaciologie et Géophysique de l'Environnement
54 rue Molière BP 96, 38402 Saint Martin d'Hères Cedex, France