Linux File Permissions: chmod, umask & ACLs Explained | Linux Basics

Linux file permissions are a fundamental part of working with any Linux system, but they can often feel confusing at first. In this video, we break down Linux file permissions in a clear and beginner-friendly way, covering everything from basic concepts to practical usage without unnecessary complexity. You'll learn how permissions work, how to manage them using tools like chmod, chown and umask and how to handle more advanced topics such as special permission bits and Access Control Lists (ACLs). We also explore how Linux evaluates permissions, common mistakes to avoid and best practices for keeping your system secure and organized. This video is designed for beginners, students, system administrators and anyone working with Linux who wants a solid understanding of file permissions. Whether you're learning Linux, refreshing your system administration knowledge or improving your CLI skills, this guide will give you the confidence to manage permissions effectively. 📌 Chapters Covered: - What are Linux file permissions? - Understanding read, write and execute (r, w, x) - Viewing permissions using ls -l - Numeric (octal) permissions & chmod - File ownership & groups - Special permission bits (SUID, GUID, Sticky Bit) - Default permissions & umask - Access Control Lists (ACLs) - How Linux evaluates permissions - Common mistakes to avoid - Best practices for managing permissions 🔗 Our other videos that you might find interesting: - Linux CLI basics: https://youtu.be/eafVBUh5-pQ - Linux File System: https://youtu.be/ISJ44S5sZu8 🎓 Join our growing community of tech enthusiasts and start learning today! ▶️ Subscribe now: https://www.youtube.com/@WhiteboardDoodles24 📌 Follow us for updates: - Facebook: https://www.facebook.com/WhiteboardDoodles24/ - Instagram: https://www.instagram.com/whiteboarddoodles24/ Timestamps: 00:00 - Intro 00:39 - How Linux decides who can do what? 02:04 - Numeric permissions & chmod 05:01 - Ownership & groups 06:36 - Special permission bits 08:40 - Default permissions & umask 10:37 - Access Control Lists (ACLs) 12:37 - How Linux evaluates permissions? 13:56 - Common mistakes 15:13 - Best practices 16:31 - Conclusions 17:29 - Outro