The following is a list of the typographical conventions used in this book:
Used to indicate new terms, URLs, filenames, file extensions,
directories, commands and options, and program names, and to
highlight comments in examples. For example, a path in the filesystem
will appear as
Used to show code examples, the contents of files, or the output from commands.
Constant width bold
Used for emphasis and user input in code.
Constant width italic
Used in examples and tables to show text that should be replaced with user-supplied values.
The second color is used to indicate a cross reference within the text.
[RETURN] (in square brackets, bold and all-caps) at the end of a line of code is used to denote an unnatural line break; that is, you should not enter these as two lines of code, but as one continuous line. Multiple lines are used in these cases due to page-width constraints.
You should pay special attention to notes set apart from the text with the following icons:
This is a tip, suggestion, or general note. It contains useful supplementary information about the topic at hand.
The thermometer icons, found next to each hack, indicate the relative complexity of the hack: