ii IntroductionUpdated Users and Groups ChapterThe Users and Groups chapter has been updated.Before reading this guide, you should be familiar with the contents of the Red Hat Enterprise LinuxInstallation Guide concerning installation issues, the Red Hat Enterprise Linux Introduction to SystemAdministration for basic administration concepts, the Red Hat Enterprise Linux System AdministrationGuide for general customization instructions, and the Red Hat Enterprise Linux Security Guide forsecurity related instructions. The Red Hat Enterprise Linux Reference Guide contains informationabout topics for advanced users.HTML, PDF, and RPM versions of the manuals are available on the Red Hat Enterprise Linux Docu-mentation CD and online at http://www.redhat.com/docs/.NoteAlthough this manual reflects the most current information possible, read the Red Hat EnterpriseLinux Release Notes for information that may not have been available prior to our documenta-tion being finalized. They can be found on the Red Hat Enterprise Linux CD #1 and online athttp://www.redhat.com/docs/.2. Finding Appropriate DocumentationYou need documentation that is appropriate to your level of Linux expertise. Otherwise, you mightfeel overwhelmed or may not find the necessary information to answer any questions. The Red HatEnterprise Linux Reference Guide deals with the more technical aspects and options of a Red HatEnterprise Linux system. This section helps you decide whether to look in this manual for the infor-mation you need or consider other Red Hat Enterprise Linux manuals, including online sources, inyour search.Three different categories of people use Red Hat Enterprise Linux, and each of these categories requiredifferent sets of documentation and informative sources. To help you figure out where you should start,determine your own experience level:New to LinuxThis type of user has never used any Linux (or Linux-like) operating system before or has hadonly limited exposure to Linux. They may or may not have experience using other operatingsystems (such as Windows). Is this you? If so, skip ahead to Section 2.1 Documentation ForFirst-Time Linux Users.Some Linux ExperienceThis type of user has installed and successfully used Linux (but not Red Hat Enterprise Linux)before or may have equivalent experience with other Linux-like operating systems. Does thisdescribe you? If so, turn to Section 2.2 For the More Experienced.Experienced UserThis type of user has installed and successfully used Red Hat Enterprise Linux before. If thisdescribes you, turn to Section 2.3 Documentation for Linux Gurus.