For this document we use some common conventions.
| Bold | is used for options to commands. |
| Italic | is used to indicate files, directories, commands and program names when they appear in the body of a paragraph. |
| Constant Width | is used in examples to show the contents of files or the output from commands, and to indicate environment variables and keywords in the body of a paragraph. |
| Constant Bold | is used in examples to show input that is typed literally by the user. |
| [ ] | surrounds optional elements in a description of program syntax. (The brackets themselves should never be typed.) |