The following conventions are used in this book:

Italic: Used for file, directory, user, and group names. It is also used for URLs and to emphasize new terms and concepts when they are introduced.
Constant Width: Used for code examples, system output, parameters, directives, and attributes.
Constant Width Italic: Used in examples for variable input or output (e.g., a filename).
Constant Width Bold: Used in code examples for user input and for emphasis.

This icon designates a note, which is an important aside to the nearby text.

This icon designates a warning relating to the nearby text.