The following typographic conventions are used in this book:
- Italic
is used for filenames and command names. It is also used to highlight comments in command examples, and to define new terms when they first appear in the text.
-
Constant Width
is used in examples to show the text that you enter literally, and in regular text to show operators, variables, and the output from commands or programs.
-
Constant Bold
is used in examples to show the user’s actual input at the terminal.
-
Constant Italic
is used in examples to show variables for which a context-specific substitution should be made. The variable
filename
, for example, would be replaced by some actual filename.- Footnotes
are used to attach parenthetical notes which you should not read on your first reading of this book. Sometimes, lies are presented to simplify the discussion, and a footnote restores the lie to truth. Often, the material in the footnote will be advanced information that is not discussed anywhere else in the book.
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