The following typographical conventions are used in this book:
Indicates menu titles, options, and buttons.
Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities.
Indicates command-line options, variables and other code elements, HTML tags, macros, the contents of files, and the output from commands.
Constant width bold
Shows commands or other text that should be typed literally by the user; also occasionally used for emphasis.
Constant width italic
Shows text that should be replaced with user-supplied values.
This icon signifies a tip, suggestion, or general note.
This icon indicates a warning or caution.