Conventions Used in This Book

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The following typographical conventions are used in this book:

Italic

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

Constant width

Used for examples and event names and to show the contents of files and the output of commands.

  Constant width bold  

Indicates user input in examples showing an interaction. It is also used to emphasize parts of constant width text, such as output listings.

[RETURN]

Indicates a carriage return at the end of a line.

Indicates a tip, suggestion, or general note.

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

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