Introduction

Our goal in writing this second edition has been to provide an up-to-date comprehensive treatment of UNIX for users of all of its major variants, including Linux, HP-UX, Solaris, AIX, and Mac OS X. (People new to the UNIX world should be aware that for all practical purposes Linux is really just a variant of UNIX, differing from other UNIX variants only deep within its kernel.) From the overwhelming success of the first edition of this book, we know that many people have found this first edition invaluable for getting started with UNIX while more advanced users have found this book an important resource for learning about new topics. The previous edition of this book and its predecessor, UNIX System V Release 4: An Introduction

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