Ubuntu User Management

Root Users

• If for some reason you wish to enable the root account, simply give it a password:
  
  

  sudo passwd 

  Sudo will prompt you for your password, and then ask you to supply a new password for root as shown below:
  
  

  [sudo] password for username: (enter your own password)
  Enter new UNIX password: (enter a new password for root)
  Retype new UNIX password: (repeat new password for root)
  passwd: password updated successfully 

• To disable the root account, use the following passwd syntax:
  
  

  sudo passwd -l root 

• You should read more on Sudo by checking out it's man page:
  
  

  man sudo
  

Adding and Deleting Users

• To add a user account, use the following syntax, and follow the prompts to give the account a password and identifiable characteristics such as a full name, phone number, etc.
  
  

  sudo adduser username 

• To delete a user account and its primary group, use the following syntax:
  
  

  sudo deluser username
  

• To temporarily lock or unlock a user account, use the following syntax, respectively:
  
  

  sudo passwd -l username
  sudo passwd -u username 

• To add or delete a personalized group, use the following syntax, respectively:
  
  

  sudo addgroup groupname
  sudo delgroup groupname 

• To add a user to a group, use the following syntax:
  
  

  sudo adduser username groupname

TBD