The Red Hat Linux Reference Guide contains useful information about the Red Hat Linux system

From fundamental concepts, such as the structure of the Red Hat Linux file system, to the finer points

of system security and authentication control, we hope you will find this book to be a valuable resource

This guide is for you if you want to learn a bit more about how the Red Hat Linux system works.
Topics that you can explore within this manual include the following:
    The file system structure
    The boot process
    The X Window System
    Security tools
    Network services