Conventions

The following typographical conventions are used in this book:

Constant width

Is used to indicate command-line computer output, computer-generated messages, and code examples. It is also used when referring to parameters in text.

Constant width italic

Is used to indicate variables in examples and text, and comments in examples.

Constant width bold

Is used to indicate user input in examples.

Italic

Is used to introduce new terms and to indicate URLs, variables or files and directories, commands, file extensions, filenames, and directory names.

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