The following typographical conventions are used in this book:
Indicates menu titles, menu options, menu buttons, and keyboard accelerators (such as Alt and Ctrl).
Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities.
Indicates commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, methods, modules, properties, parameters, values, objects, macros, the contents of files, or the output from commands.
Constant width bold
Indicates commands or other text that should be typed literally by the user.
Constant width italic
Indicates text that should be replaced with user-supplied values.