| AaBbCc123 | The names of commands, files, and directories; on-screen computer output | Edit your .login file. Use ls -a to list all files. machine_name% You have mail . |
| AaBbCc123 | What you type, contrasted with on-screen computer output | machine_name% su Password: |
| AaBbCc123 | Command-line placeholder: replace with a real name or value | To delete a file, type rm filename. |
| AaBbCc123 | Book titles, new words or terms, or words to be emphasized | Read Chapter 6 in User's Guide . These are called class options. You must be root to do this. |