The format utility provides a help facility that you can use whenever the format utility is expecting input. You can request help about what input is expected by entering a question mark (?). The format utility displays a brief description of what type of input is needed.
If you enter a ? at a menu prompt, a list of available commands is displayed.
The man pages associated with the format utility include the following:
format(1M) - Describes the basic format utility capabilities and provides descriptions of all command-line variables.
format.dat(4) - Describes disk drive configuration information for the format utility.