Description

   The DIRECTORY command provides a directory listing of the
   available files. The listing is returned to you as a mail
   message.

   The file-spec parameter is optional and, if omitted, defaults
   to "*". If you are unsure of what to use, omit the parameter and
   send simply the command

   DIRECTORY

   This will provide you with a list of the files and directories
   in the top-level directory of the mail server. You can then
   this information to refine your queries; e.g., investigate the
   contents of an intriguing directory,

   DIRECTORY [GAMES...]