This book uses the following typographical conventions:
Used for commands, programs, and options. Italic also indicates new terms, URLs, filenames and file extensions, and directories.
Constant Width
Used to show the contents of files or the output from commands. Constant width is also used to indicate domains, types, roles, macros, processes, policy elements, aliases, rules, and operations.
Constant Width Bold
Used in examples and tables to show commands or other text that should be typed literally by the user.
Constant Width Italic
Used in examples and tables to show text that should be replaced with user-supplied values.
A final word about syntax: in many cases, the space between an option and its argument can be omitted. In other cases, the spacing (or lack of spacing) must be followed strictly. For example, -wn (no intervening space) might be interpreted differently from -w n. It’s important to notice the spacing used in option syntax.
In a keyboard accelerator (such as Ctrl-Alt-Del), a dash indicates that the keys should be held down simultaneously, whereas a space means that the keys should be pressed sequentially. For example, Ctrl-Esc indicates that the Control and Escape keys should be held down simultaneously, whereas Ctrl Esc means that the Control and Escape keys should be pressed sequentially.
IF a keyboard accelerator contains an uppercase letter, you should not type the Shift key unless it’s given explicitly. For example, Ctrl-C indicates that you should press the Control and C keys; Ctrl-Shift-C indicates that you should press the Control, Shift, and C keys.