[CentOS] User Details

[John Doe]

From: James Bensley <jwbensley at gmail.com>

>-How to add a new user?
> $ useradd
> -bash: useradd: command not  found
> (This is the same for my normal user and when logged in as  root)

First, normal user not finding useradd is normal.
And it would not be able to use it for obvious security reasons...
Second: use 'su -' instead of 'su'.
locate 'x' finds 'x' on your filesystem...
Third: http://www.google.fr/search?q=unix+tutorial

JD