Conventions Used in This Book

The following typographical conventions are used in this book:


Is used for filenames, directory names, and URLs. It is also used for emphasis and for the first use of a technical term.

Constant width

Is used for code examples. It is also used for functions, arguments, structures, environment variables, data types, and values.

Indicates a tip, suggestion, or general note.

Indicates a warning or caution.