File and Directory Permissions - Part I

This lesson covers the security features that you can use in order to secure your files and directories on Linux. We look at permissions, data sharing, special modes, file attributes, ACLs, and rootkits. You will also have the chance to follow along with guided demonstrations which will give you a practical understanding of the concepts covered.

Learning Objectives

• Learn how Linux file and directory permissions work and how to apply the proper permissions to files and directories
• Learn how to share data securely with groups and multiple users on a Linux system
• Understand how special modes add extra security to file systems
• Learn how to make files unchangeable even by the root user and how to secure the log files on a Linux system by making them append-only
• Learn how to secure files and directories using ACLs
• Learn about rootkits and how to discover and remove them

Intended Audience

This lesson is intended for anyone who wants to understand how to secure their Linux systems.

Prerequisites

To get the most out of this lesson, you should already have a good working knowledge of Linux. If you want to brush up on your Linux skills, consider taking our Learn Linux in 5 Days course first.