Welcome to the Red Hat Linux Reference Guide.

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:

1. Changes To This Manual

This manual has been reorganized for clarity and updated for the latest features of Red Hat Linux 9. Some of the changes include:

Updated The X Window System Chapter

The X Window System has been completely revised and reorganized for clarity. New font configuration instructions were added as well.

A New sysconfig Chapter

The sysconfig section of the Boot Process, Init, and Shutdown chapter has been expanded and converted into its own chapter.

Updated TCP Wrappers and xinetd Chapter

The newly updated TCP Wrappers and xinetd chapter has been completely overhauled and reorganized for clarity.

Updated Users and Groups Chapter

The Users and Groups chapter has been clarified, updated, and reorganized.

Updated Network Interfaces Chapter

The Network Interfaces chapter has been updated and reorganized.

An Updated Apache HTTP Server Chapter

The guide for migrating from version 1.3 to version 2.0 of the Apache HTTP Server has been updated. The list of server configuration options has been further updated and reorganized. Special thanks to Gary Benson and Joe Orton for their hard work on the Apache HTTP Server migration guide.

Before reading this guide, you should be familiar with the contents of the Red Hat Linux Installation Guide concerning installation issues, the Red Hat Linux Getting Started Guide for basic Linux concepts and the Red Hat Linux Customization Guide for general customization instructions. The Red Hat Linux Reference Guide contains information about topics for advanced users.

HTML and PDF versions of all the Red Hat Linux manuals are available online at:


Although this manual reflects the most current information possible, you should read the Red Hat Linux Release Notes for information that may not have been available prior to our documentation being finalized. The Release Notes can be found on the Red Hat Linux CD #1 and online at the following URL: