Reboot Grup to the specific OS you specify #grub #bash

rebootgrub2os.sh

#!/bin/bash

if ! grep "GRUB_DEFAULT=saved" /etc/default/grub > /dev/null; then
    sudo sed -i 's/^GRUB_DEFAULT=.*/GRUB_DEFAULT=saved/' /etc/default/grub
fi

echo
echo "== SELECT WHICH OS TO BOOT =="
echo
sudo cat /boot/grub/grub.cfg | grep -oE "^menuentry '[^']+'" | awk -F\" '{print N++,$(NF-1)}'
echo
read -p "Enter number (q to abort) and press ENTER: " CHOICE
if [ "$CHOICE" != "q" ] ; then
  sudo grub-reboot $CHOICE
  sudo shutdown -r now
fi