Audience for This Book

This book should be of interest to Unix users and Unix programmers, as well as to anyone (such as a system administrator) who might offer direct support to users and programmers. The presentation is geared mainly toward people who are already familiar with the Unix system; that is, you know what you want to do, and you even have some idea how to do it. You just need a reminder about the details. For example, if you want to remove the third field from a database, you might think, "I know I can use the cut command, but what are the options?" In many cases, this book provides specific examples to show how a command is used.

This reference might also help people who are familiar with some aspects of Unix but not with others. Many chapters include an overview of the particular topic. While this isn't meant to be comprehensive, it's usually sufficient to get you started in unfamiliar territory.

Finally, if you're new to the Unix side of Mac OS X, and you're feeling bold, you might appreciate this book as a quick tour of what Unix has to offer. Chapter 1 can point you to the most useful commands, and you'll find brief examples of how to use them, but take note: this book should not be used in place of a good beginner's tutorial on Unix. For that, you might try O'Reilly's Learning Unix for Mac OS X Tiger . This reference should be a supplement, not a substitute. (There are references throughout the text to other relevant O'Reilly books that will help you learn the subject matter under discussion; in some cases, you may be better off detouring to those books first.)