Conventions

Following are examples of the typographical and graphic conventions used in this guide:

• Functions, utility program names, standard names, and classes.
• Option flags
• File names, ‘button names’, and ‘field names’.
• Variables, environment variables, and metasyntactic variables.
• Emphasis.
• [optional information or parameters]
• Examples are described by text

            and then shown this way.
  

Commands that are entered by the user are preceded in this manual by the characters ‘$ ’ (dollar sign followed by space). If your system uses this sequence as a prompt, then the commands will appear exactly as you see them in the manual. If your system uses some other prompt, then the command will appear with the ‘$’ replaced by whatever prompt character you are using.