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?

Aprender Linux es valioso para muchas profesiones de TI. Para administradores de sistemas, ingenieros DevOps y desarrolladores backend, permite una gestión eficiente de servidores, automatización del desarrollo y despliegue de software, así como el desarrollo y administración de aplicaciones del lado del servidor. Para administradores de redes, profesionales de ciberseguridad y analistas de datos, el conocimiento de Linux ayuda a gestionar redes de manera efectiva, garantizar la seguridad y analizar datos.

Aprenda qué es Linux, explore sus principales ventajas y comprenda por qué es una opción preferida entre los desarrolladores. Seleccione una distribución de Linux para utilizar durante el curso.

Configuración de un entorno virtual e instalación de Linux en el ordenador para practicar comandos de forma segura sin afectar el sistema principal.

Adquisición de habilidades esenciales en Linux, como el uso de la terminal, la navegación de archivos, la instalación de programas y el mantenimiento actualizado del sistema.

Descubra cómo gestionar usuarios y grupos, configurar permisos de archivos y controlar los derechos de acceso dentro del entorno Linux.

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?