Documentation made easier
grub-emu − GRUB emulator
grub-emu [OPTION...]
GRUB emulator.
−d, −−directory=DIR
use GRUB files in the directory DIR [default=/boot/grub2]
−H, −−hold[=SECS]
wait until a debugger will attach
−−memdisk=FILE
use FILE as memdisk
−m, −−device−map=FILE
use FILE as the device map [default=/boot/grub2/device.map]
−r, −−root=DEVICE_NAME
Set root device.
−v, −−verbose
print verbose messages.
−X, −−kexec
use kexec to boot Linux kernels via systemctl (pass twice to enable dangerous fallback to non−systemctl).
−?, −−help
give this help list
−−usage
give a short usage message
−V, −−version
print program version
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
Report bugs to <bug−grub@gnu.org>.
If you are trying to install GRUB, then you should use grub-install(8) rather than this program.
The full documentation for grub-emu is maintained as a Texinfo manual. If the info and grub-emu programs are properly installed at your site, the command
info grub-emu
should give you access to the complete manual.