Summary  
This chapter explains the Linux file permission model by defining three user roles—owner, group, and others—and how to assign read, write, and execute access rights to control file and folder security.  

General domain of usage  
System administration

In **Windows or MacOS**, when you create a file or folder, you can set permissions only for **yourself** or for **all users** on your computer. In **Linux**, there's a bit more control. When you create a file or folder, you can set permissions for three groups of people:

- **Owner**: that's **you**, the one who created the file or folder. You can decide what can and cannot be done with this file or folder, like who can read, write, or delete it;

- **Group**: you can also create a special **group of people** who have access to this file or folder. These could be your **friends or colleagues**. You can set permissions for this group separately from the ones you set for yourself;

- **Others**: these are **all the other people** who use this computer but aren't the owners or part of the group. You can also set permissions for them, determining what they can or cannot do with your file or folder.

This allows you to **control who has access** to your file or folder and **what actions** they can perform. It's an important **security aspect** in Linux that helps protect your data from unwanted changes.


Up to this point, you’ve been performing all actions as **root user**.  The **root user** in Linux has the **highest access rights** and **full control** over the system. They can perform any **system-level operations**.  You’ll learn how to create and manage **new users**, **user groups**, and their **access rights**.

Study More

Who is considered the owner of a file or folder in Linux?

What are the three groups of people you can set permissions for when creating a file or folder in Linux?

Å lære Linux er verdifullt for mange IT-yrker. For systemadministratorer, DevOps-ingeniører og backend-utviklere muliggjør det effektiv serveradministrasjon, automatisering av programvareutvikling og -distribusjon, samt utvikling og administrasjon av serverbaserte applikasjoner. For nettverksadministratorer, cybersikkerhetseksperter og dataanalytikere bidrar Linux-kunnskap til effektiv nettverksadministrasjon, sikring av sikkerhet og dataanalyse.

Lær hva Linux er, utforsk dets viktigste fordeler, og forstå hvorfor det er et foretrukket valg blant utviklere. Velg en Linux-distribusjon å bruke gjennom kurset.

Konfigurasjon av et virtuelt miljø og installasjon av Linux på datamaskinen for å trygt kunne øve på kommandoer uten å påvirke hovedsystemet.

Tilegn deg grunnleggende Linux-ferdigheter som bruk av terminal, filnavigasjon, programvareinstallasjon og systemoppdatering.

Lær hvordan du administrerer brukere og grupper, konfigurerer filtillatelser og kontrollerer tilgangsrettigheter i Linux-miljøet.

Understanding User Roles Concepts

1. Who is considered the owner of a file or folder in Linux?

2. What are the three groups of people you can set permissions for when creating a file or folder in Linux?