Change Grub2 default menu entry

chgrub2env.sh

#!/bin/bash
if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi
echo "=================================="
echo "Grub2 selected menu entry changer"
echo "=================================="
cenvraw=$(grub2-editenv list)
cenv=${cenvraw#*=}
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
echo "Please choose one of the entries above [$cenv]: "
read nenv
if [[ -z "$nenv" ]]; then
    printf '%s\n' "No new entry chosen!"
    exit 1
else
    grub2-set-default $nenv
    echo "grub2 default entry now \"$nenv\""
fi