Linux Users, Groups and sudo for Beginners

This guide is for learning. Run these commands only on your own lab or servers.

Work as a normal user and use sudo only when you need it. This limits the damage from a mistake.

Create and inspect

sudo adduser labuser
id labuser

Groups

sudo groupadd students
sudo usermod -aG students labuser

Give sudo

sudo usermod -aG sudo labuser

Lock an account

sudo passwd -l labuser

Use a strong, unique password. ChangeMe123 style examples are only placeholders.