Commands usable anywhere in the menu and in the command-line.

serial

Command: serial [--unit=unit] [--port=port] [--speed=speed] [--word=word] [--parity=parity] [--stop=stop]

Initialize a serial device. unit is a number in the range 0-3 specifying which serial port to use; default is 0, which corresponds to the port often called COM1. port is the I/O port where the UART is to be found; if specified it takes precedence over unit. speed is the transmission speed; default is 9600. word and stop are the number of data bits and stop bits. Data bits must be in the range 5-8 and stop bits must be 1 or 2. Default is 8 data bits and one stop bit. parity is one of ‘no’, ‘odd’, ‘even’ and defaults to ‘no’.

The serial port is not used as a communication channel unless the terminal_input or terminal_output command is used (see terminal_input, see terminal_output).

See also Serial terminal.

terminal_input

Command: terminal_input [--append|--remove] [terminal1] [terminal2] …

List or select an input terminal.

With no arguments, list the active and available input terminals.

With --append, add the named terminals to the list of active input terminals; any of these may be used to provide input to GRUB.

With --remove, remove the named terminals from the active list.

With no options but a list of terminal names, make only the listed terminal names active.

terminal_output

Command: terminal_output [--append|--remove] [terminal1] [terminal2] …

List or select an output terminal.

With no arguments, list the active and available output terminals.

With --append, add the named terminals to the list of active output terminals; all of these will receive output from GRUB.

With --remove, remove the named terminals from the active list.

With no options but a list of terminal names, make only the listed terminal names active.

terminfo

Command: terminfo [-a|-u|-v] [-g WxH] [term] [type]

Define the capabilities of your terminal by giving the name of an entry in the terminfo database, which should correspond roughly to a ‘TERM’ environment variable in Unix.

The currently available terminal types are ‘vt100’, ‘vt100-color’, ‘ieee1275’, and ‘dumb’. If you need other terminal types, please contact us to discuss the best way to include support for these in GRUB.

The -a (--ascii), -u (--utf8), and -v (--visual-utf8) options control how non-ASCII text is displayed. -a specifies an ASCII-only terminal; -u specifies logically-ordered UTF-8; and -v specifies "visually-ordered UTF-8" (in other words, arranged such that a terminal emulator without bidirectional text support will display right-to-left text in the proper order; this is not really proper UTF-8, but a workaround).

The -g (--geometry) can be used to specify terminal geometry.

If no option or terminal type is specified, the current terminal type is printed.