GNU Info

(grub.info)terminal

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Enter node , (file) or (file)node

terminal
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 - Command: terminal [`--dumb'] [`--timeout=secs'] [`console']
          [`serial'] [`hercules']
     Select a terminal for user interaction. The terminal is assumed to
     be VT100-compatible unless `--dumb' is specified. If both
     `console' and `serial' are specified, then GRUB will use the one
     where a key is entered first or the first when the timeout
     expires. If neither are specified, the current setting is
     reported. This command is only available if GRUB is compiled with
     serial support. See also Note: Serial terminal.

     This may not make sense for most users, but GRUB supports Hercules
     console as well. Hercules console is usable like the ordinary
     console, and the usage is quite similar to that for serial
     terminals: specify `hercules' as the argument.