If you are doing this as root, don't use the 'sudo' command.

To add a user to the system:

1. Issue the useradd command to create a locked user account:

sudo useradd <username>

1. Unlock the account by issuing the passwd command to assign a password and set password aging guidelines:

sudo passwd <username>

If you get the following error:

bash: useradd: command not found

Try

sudo /sbin/useradd <username>

Or

sudo /usr/sbin/useradd <username>

See what groups the user is in:<br /> id -nG {user-name} <br /> Add user and specify home directory while adding to groups:<br /> sudo useradd -d /home/testuser -m testuser -G adm,dialout,cdrom,plugdev,lpadmin,sambashare,admin <br /> Add user to a group: <br /> sudo useradd -a -G admin testuser <br /> To modify (or remove from) group membership, just specify explicitly: <br /> sudo useradd -G adm,dialout,cdrom,plugdev testuser <br />

• http://www.cyberciti.biz/faq/howto-linux-remove-user-from-group/
• http://www.ubuntuka.com/add-user-to-existing-group-ubuntu/
• http://www.howtogeek.com/howto/ubuntu/add-a-user-on-ubuntu-server/

– Main.FredPettis - 02 Jun 2009