The following table describes the typographic changes that are used in this book.
Table P–1 Typographic Conventions| Typeface or Symbol | Meaning | Example | 
|---|---|---|
| AaBbCc123 | The names of commands, files, and directories, and onscreen computer output | Edit your .login file. Use ls -a to list all files. machine_name% you have mail. | 
| AaBbCc123 | What you type, contrasted with onscreen computer output | machine_name% su Password: | 
| AaBbCc123 | Command-line placeholder: replace with a real name or value | The command to remove a file is rm filename. | 
| AaBbCc123 | Book titles, new terms, and terms to be emphasized | Read Chapter 6 in the User's Guide. These are called class options. Do not save the file. (Emphasis sometimes appears in bold online.) |