grub.info: Invoking the grub shell

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Invoking the grub shell

   This chapter documents the grub shell `grub'. Note that the grub
shell is an emulator; it doesn't run under the native environment, so it
sometimes does something wrong. Therefore, you shouldn't trust it too
much. If there is anything wrong with it, don't hesitate to try the
native GRUB environment, especially when it guesses a wrong map between
BIOS drives and OS devices.