Conventions Used in This Book

The following is a list of the typographical conventions used in this book:

Italics

Used to indicate URLs, Unix utilities, filenames, filename extensions, and directory/folder names. For example, a path in the filesystem will appear as /Developer/Applications.

Constant width

Used to show code examples, the contents of files, and console output, as well as the names of variables, commands, and other code excerpts in the text.

Constant width bold

Used to indicate user input, such as commands to be entered by the user, and to highlight portions of code (typically new additions to old code).

Constant width italic

Used in code examples to show sample text to be replaced with your own values.

Gray type

Used to indicate a cross-reference within the text.

You should pay special attention to notes set apart from the text with the following icons:

This is a tip, suggestion, or general note. It contains useful supplementary information about the topic at hand.

This is a warning or note of caution, often indicating that your money or your privacy might be at risk.

The thermometer icons, found next to each hack, indicate the relative complexity of the hack:

beginner moderate expert