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.
Indicate the text of the original licenses and separate them from the commentary.
This icon signifies a tip, suggestion, or general note.
This icon indicates a warning or caution.