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(grub.info)Basic usage

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Introduction into the grub shell
================================

   You can use the command `grub' for installing GRUB under your
operating systems and for a testbed when you add a new feature into GRUB
or when fix a bug. `grub' is almost the same as the Stage 2, and, in
fact, it shares the source code with the Stage 2 and you can use the
same commands (Note: Commands) in `grub'. It is emulated by replacing
BIOS calls with UNIX system calls and libc functions.

   The command `grub' accepts the following options:

`--help'
     Print a summary of the command-line options and exit.

`--version'
     Print the version number of GRUB and exit.

`--verbose'
     Print some verbose messages for debugging purpose.

`--device-map=FILE'
     Use the device map file FILE. The format is described in Note:
     Device map.

`--no-floppy'
     Do not probe any floppy drive. This option has no effect if the
     option `--device-map' is specified (Note: Device map).

`--probe-second-floppy'
     Probe the second floppy drive. If this option is not specified,
     the grub shell does not probe it, as that sometimes takes a long
     time. If you specify the device map file (Note: Device map), the
     grub shell just ignores this option.

`--config-file=FILE'
     Read the configuration file FILE instead of `/boot/grub/menu.lst'.
     The format is the same as the normal GRUB syntax. See Note:
     Filesystem, for more information.

`--boot-drive=DRIVE'
     Set the stage2 BOOT_DRIVE to DRIVE. This argument should be an
     integer (decimal, octal or hexadecimal).

`--install-partition=PAR'
     Set the stage2 INSTALL_PARTITION to PAR. This argument should be
     an integer (decimal, octal or hexadecimal).

`--no-config-file'
     Do not use the configuration file even if it can be read.

`--no-curses'
     Do not use the curses interface even if it is available.

`--batch'
     This option has the same meaning as `--no-config-file --no-curses'.

`--read-only'
     Disable writing to any disk.

`--hold'
     Wait until a debugger will attach. This option is useful when you
     want to debug the startup code.