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This book is about Linux, a clone of the UNIX operating system that runs on machines with an Intel 80386 processor or better, as well as Intel-compatible CPUs, such as AMD and Cyrix.
This first chapter introduces you to the major features of Linux and helps get you acquainted with them. It does not go into great detail or cover any advanced topics, as this is done in later chapters. Instead, it is intended to give you a head start in understanding what Linux is, what Linux offers you, and what you need to run it.
Don't be afraid to experiment. The system won't bite you. You can't destroy anything by working on it. UNIX has some amount of security built in, to prevent "normal" users (the role you will now assume) from damaging files that are essential to the system. The absolute worst thing that can happen is that you'll delete all of your files and have to go back and reinstall the system. So, at this point, you have nothing to lose.
One word of caution when reading this chapter: At times it will delve into topics that may seem very alien to you, especially if you are new to UNIX and Linux. Don't despair. As you go through this book, you will become more and more familiar with the topics introduced here. Linux is not an easy system to pick up in one day, so don't try to do it. There is no substitute for experience, so relax and learn Linux at your own pace.