[olug] user management

[Jake Churchill]

When adding users using 'useradd' it pulls the default information from 
the /etc/default/useradd file.  Mine is as follows:

GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=/bin/bash
SKEL=/etc/skel
GROUPS=video,dialout

My issue is that when I create a user, it adds them with the default 
group as users, which is GID 100.  What do I need to change to ensure 
that when I add a user, it specifies them with the group that is equal 
to their user name.  For example, user john needs to be added and his 
primary group must be john, rather than users.  Is there a way to alter 
this file so that it does that and so that it automatically sets the 
home directory to /home/john.
I'm trying to figure out how to do this dynamically rather than specify 
everything manually.

thanks