| The following typographical conventions are used in this book: - Italic
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Used for filenames, directory names , and URLs. It is also used for emphasis and for the first use of a technical term . - Constant width
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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. | | |