Users and rights

• https://help.ubuntu.com/10.04/serverguide/user-management.html

Enable the root account by specifying a password for it:

sudo passwd

Disable the root account:

sudo passwd -l root

Add a user account and home folder, delete user:

sudo adduser username
sudo deluser username

Lock (l) or unlock (u) a user account:

sudo passwd -l username
sudo passwd -u username

Add or delete a personalized group:

sudo addgroup groupname
sudo delgroup groupname

Add a user to a group:

sudo adduser username groupname

• http://www.cyberciti.biz/tips/unix-or-linux-commands-for-changing-user-rights.html

sudo chmod

• http://www.cyberciti.biz/faq/how-to-use-chmod-and-chown-command/

sudo chown