#2.sh
#! /bin/sh
echo "submenu 'All variants' {"

initrd=$(ls /boot | grep -E -o -e "^initrd.*$")
for i in $initrd; do
    version=$(echo $i | grep -E -o -e "-.*$")
    #version=${version/./\.}
    cores=$(ls /boot | grep -E -o -e ".*$version$")
    for j in $cores; do
        echo "menuentry '$j' {"
        echo "set root='hd0,msdos1'"
        echo "echo \"loading linux /boot/$j\""
        echo "linux /boot/$j -root=/dev/sda ro"
        echo "echo \"loading initrd /boot/$i\""
        echo "initrd /boot/$i"
        echo "}"
    done
done

echo "}"

#copytogrub.sh
sudo cp 2.sh /etc/grub.d/42_mygrub
sudo chmod +x /etc/grub.d/42_mygrub
sudo update-grub