User

Abstract

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• Person authorised to use the system

Linux User

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• Based on Unix & POSIX

  
  

• Obtain information of all User session in the OS

who

• Obtain UID of a user and User Group information that the user is in

id <USER_NAME>

• List All Users in the system

cut -d: -f1 /etc/passwd

• Create user with administrative privileges

sudo useradd -m -G wheel <USERNAME>
sudo passwd johndoe # Set the password for new user
 
sudo usermod -aG <GROUPNAME> <USERNAME> # Add new user to other groups

• Delete user

sudo userdel <USERNAME>

Terminologies

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UID

• Stands for User IDentification
• A number that is assigned to each User by System Administrator
• One is assigned to Superuser (UNIX)

User Group

• Assigned a Group IDentification (GID)
• User can be members of the group