How to Understand Linux File and Directory Permissions: Linux Server Training 101
http://www.soundtraining.net/linux-se... In this video, you'll gain a fundamental understanding of the basics of Linux (and Unix) file and directory permissions including read, write, and execute for the user, group, and world. You'll also gain an understanding of special permissions including the sticky bit, setuid, and setgid. Permissions are explained in both the alphabetic format and using the octal (or numeric) format. This is a companion video to the book The Accidental Administrator: Linux Server Step-by-Step Configuration Guide.