Conventions Used in This Book
The following typographical conventions are used in the text of this book:
Indicates emphasis, new terms, URLs, email addresses, filenames, paths, and Unix utilities.
Indicates commands, variables, attributes, functions, classes, namespaces, methods, modules, values, the contents of files, the output from commands, and code examples that break recommended practices.
Indicates commands and other text that should be typed literally by the user, and code examples that demonstrate recommended practices.
Indicates text that should be replaced with user-supplied values and comments within code examples.