The following typographical conventions are used in this book:
Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities
Constant width
Indicates commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, methods, modules, properties, parameters, values, objects, events, event handlers, XML tags, HTML tags, macros, the contents of files, and the output from commands
Constant width
bold
Shows commands and other text that should be typed literally by the user
Constant width italic
Shows text that should be replaced with user-supplied values
This icon signifies a tip, suggestion, or general note.
This icon signifies a caution or warning.