Linux + Windows dual-booting (grub-reboot)

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1. Change ‘GRUB_DEFAULT=0’ to ‘GRUB_DEFAULT=saved’ in /etc/default/grub

vi /etc/default/grub

2. Type the following cmd lines

sudo update-grub
sudo grub-set-default 0

3. Check your windows number (starts from 0)

grep -Ei 'submenu|menuentry ' /boot/grub/grub.cfg | sed -re "s/(.? )'([^']+)'.*/\1 \2/"

4. Type the following cmd lines with windows number (e.g. 2)

sudo grub-reboot 2
sudo reboot

5. If you want to make a command, type the following code in ~/.bashrc or ~/.zshrc

function windows {
	NEXT_OS=`grep 'Windows' /boot/grub/grub.cfg|cut -d \' -f 2`
	sudo grub-reboot "$NEXT_OS"
	sudo reboot
}