Configures grub to set last used entry as default automatically in each boot

grub-use-saved.sh

# @author: mmdemirbas@gmail.com

filename=/etc/default/grub

# Replace GRUB_DEFAULT value to 'saved'
echo :: Setting GRUB_DEFAULT=saved
sudo sed -i 's/GRUB_DEFAULT=.*/GRUB_DEFAULT=saved/g' $filename

# Append GRUB_SAVEDEFAULT=true after deleting old GRUB_SAVEDEFAULT's
echo :: Setting GRUB_SAVEDEFAULT=true
sudo sed -i '/GRUB_SAVEDEFAULT=.*/d' $filename
sudo sed -i '$aGRUB_SAVEDEFAULT=true' $filename

# Update config
echo :: Calling update-grub
sudo update-grub