## 0.5. Conventions Used in This Book

The following conventions are used in this book:

`Constant width`

  Used for anything that might appear in a program, including keywords, function names, SQL commands, and variable names. This font is also used for code examples, output displayed by commands, and system configuration files.

`Constant width bold`

  Used for user input.

`Constant width italic`

  Indicates an element (e.g., a filename or variable) that you supply.

Italic

  Used for directory names, filenames, program names, Unix commands, and URLs. This font is also used to introduce new terms and for emphasis.

> #### NOTE

> This is used to indicate a tip, suggestion, or general note.

> #### WARNING

> This is used to indicate a warning.

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