## 0.5. Conventions Used in This Book

The following typographical conventions are used in this book:

Italic
  Used to indicate new terms, URLs, filenames, file extensions, directories, commands and options, Unix utilities, and to highlight comments in examples. For example, a path in the filesystem will appear in the text as /Applications/Utilities.
`Constant width`
  Used to show functions, variables, keys, attributes, the contents of files, or the output from commands.
Constant width bold
  Used in examples and tables to show commands or other text that should be typed literally by the user.
``Constant width italic``
  Used in examples and tables to show text that should be replaced with user-supplied values.
Menus/Navigation
  Menus and their options are referred to in the text as File Open, Edit Copy, etc. Arrows will also be used to signify a navigation path when using window options; for example: System Preferences Accounts Users means that you would launch System Preferences, click the icon for the Accounts control panel, and select the Users pane within that panel.
Pathnames
  Pathnames are used to show the location of a file or application in the filesystem. Directories (or folders for Mac and Windows users) are separated by a forward slash. For example, if you see something like, "...launch the Terminal application (/Applications/Utilities)" in the text, that means the Terminal application can be found in the Utilities subfolder of the Application folder.
`%`, `#`
  The percent sign (`%`) is used in some examples to show the user prompt for the tcsh shell; the hash mark (`#`) is the prompt for the root user.

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