I'm curious about is there grub has command in operator system can do modified bootmanger / boot sector once like efibootmgr -n {the bootnumber}.

The efibootmgr -n command will switch uefi boot sector in next time boot.

What I want is switch on dual OS once in windows/linux with select via grub's menuentry number by command but not in grub menu mode.(Not change the grub default)

So I think can use grub command both in legacy bios/uefi other boot firmware if it's possible.

  • There's grub-reboot.
    – Tom Yan
    Jul 29 at 8:13

If your version of GRUB is modern enough, there should be a grub-reboot command that works essentially the same as efibootmgr -n.

For the grub-reboot command to work, you may need to set GRUB_DEFAULT=saved in /etc/default/grub if it is not already set that way.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.