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Typographical conventions

The following typographical conventions are used in this book:


Denotes text that can be entered at the keyboard, such as commands, file and program names, and source code.


Denotes a permitted abbreviation for a command or option. The underlined text can be entered instead of the full command or option name.

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Denotes arguments to commands and functions where the argument is to be replaced by a specific value.


Highlights important notes, introduces special terminology, denotes internal cross-references, and citations.


Highlights interface elements, such as menu names and buttons. Also used for terms in descriptive lists, where appropriate.

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Denotes language keywords when used outside example code and ARM processor signal names.