Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

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

Constant width

Used for code examples.

  Constant width bold  

Used occasionally in code examples to highlight statements being discussed.

Indicates a tip, suggestion, or general note. For example, we'll tell you if a certain feature is version-specific.

Indicates a warning or caution. For example, we'll tell you if a certain operation has some kind of negative impact on the system.