Not setting prefix in grub?

Question

linux

I change prefix
set prefix=(hd0, msdos7)/boot/grub
As a result, after the set command, I see the following
prefix=(hd0,
Well, and, accordingly, various errors

Answer 1

Editing the grub config with your hands is bad manners.
Use grub-mkconfig -o /boot/grub/grub.cfg
if you want to do multiboot, then first install os-prober.