This book uses conventions to make its explanations shorter and clearer. The following paragraphs describe these conventions.
Mac OS X versions
References to Mac OS X refer to version 10.8 (Mountain Lion). Because the book focuses on the underlying operating system, which changes little from one release of OS X to the next, the text will remain relevant through several future releases. The author’s Web site (www.sobell.com) provides corrections and updates as appropriate.
Text and examples
The text is set in this type, whereas examples are shown in a
monospaced font (also called a fixed-width font):
$ cat practiceThis is a small file I createdwith a text editor.
Items you enter
Everything you enter at the keyboard ...