In Ubuntu we use below command to update grub :
But how do I update grub version 2.00 in Arch Linux ? `
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update-grub command is just a script which runs the
grub-mkconfig tool to generate a grub.cfg file. See the Archlinux GRUB documentation. It refers to the following:
# grub-mkconfig -o /boot/grub/grub.cfg
You can install the same update-grub command on arch linux with this aur package: https://aur.archlinux.org/packages/update-grub/
The real solution is for pacman to automatically update grub, which is accomplished by installing
grub-hook from AUR.
There is also the graphical tool grub-customizer that automatically runs
os-prober and lets you customize the GRUB prompt in many ways.