Users, sudo and SSH access
Create accounts, grant privileges with sudo, and secure SSH with keys — without ever locking yourself out.
A production server never belongs to one person, and nobody works on it as root. This course covers who can do what on a Linux system, how to grant exactly enough, and how to close the most attacked front door on the internet.
What you will be able to do
- Know who you are on a system and which groups you belong to
- Create and remove accounts cleanly, with or without their data
- Grant privileges with sudo without opening a back door
- Move SSH to key authentication and turn passwords off
Before this course
Taken from the learning path this course belongs to: the course placed just before it. A suggested order, not a lock — nothing here closes until you have finished it.
Outline
- 01
Accounts and groups
Who exists on the machine, and how the system knows.
- 02
Privileges and remote access
Raising your rights without becoming root, and closing the front door.
- 03
Sharing the machine
Where default permissions come from, a shared directory without 777, and becoming another account without the wrong shell.
Technical content last reviewed on 2 August 2026