This pocket reference follows certain typographic conventions, outlined here:
Constant Width
Used for code examples, commands, directory names, and options.
Constant Width Italic
Used in syntax and command summaries to show replaceable text; this text should be replaced with user-supplied values.
Constant Width Bold
Used in code examples to show commands or other text that should be typed literally by the user.
Used to show generic arguments and options; these should be replaced with user-supplied values. Italic is also used to highlight comments in examples, to introduce new terms, and to indicate filenames.
$
Used in some examples as the Bourne shell or Korn shell prompt.
[ ]
Surround optional elements in a description of syntax. (The brackets themselves should never be typed.)