grub: ls

 
 16.3.45 ls
 ----------
 
  -- Command: ls [arg ...]
      List devices or files.
 
      With no arguments, print all devices known to GRUB.
 
      If the argument is a device name enclosed in parentheses (⇒
      Device syntax), then print the name of the filesystem of that
      device.
 
      If the argument is a directory given as an absolute file name
      (⇒File name syntax), then list the contents of that
      directory.