This book uses the following typographical conventions:
Indicates menu titles, menu options, and menu buttons.
Indicates new terms, URLs, email addresses, filenames, pathnames, and directories.
Constant width
Indicates commands, options, switches, variables, attributes, keys, functions, file extensions, utilities, the contents of files, and the output from commands.
Constant width bold
Shows commands or other text that you should type literally.
Constant width italic
Shows text that you should replace with user-supplied values.
The thermometer icons, found next to each hack, indicate the relative complexity of the hack: