For changing computer name
check this out-------------->
http://www.liberiangeek.net/2011/03/...u-11-04-natty/
And this ------------------->
http://askubuntu.com/questions/87665...hout-a-restart
To add a user you must use the sudo command. Here are the commands:
To add a user
Code:
$ sudo adduser <username>
To see the options for adding a user try the man command.
Here is a useful example of the useradd command. Why use useradd? It gives a few more options for special cases. To add a user, give her a standard home directory in the /home folder and specify the shell she accesses by default do this:
Code:
$ sudo useradd username -m -s /bin/bash
then
Code:
$ sudo passwd username
type the new password
Groups
You might also wish to create a new group for your users.
Code:
# sudo addgroup <groupname>
To add a new user to a existing group you would do this:
Code:
# sudo adduser <username> audio
To add an existing user to an existing group you can use the same command:
Code:
# sudo adduser <username> <groupname>
or
Code:
# sudo usermod -aG <groupname> <username>
Make sure you add your new users to the same groups of your existing user so you can execute commands at the same admin levels
see this ---------------->
http://www.howtogeek.com/howto/ubunt...er-belongs-to/
Good luck to you!