Raspberry Pi rootfs ROM control function

rsfsrom.sh

# Raspberry Pi rootfs ROM control function
function rsfsrom() {
  case $1 in
    "status" )
      raspi-config nonint get_overlay_now && echo "enable" || echo "disabled"
    ;;
    "enable" )
      sudo raspi-config nonint enable_overlayfs &&
      echo -e "rootfs ROM is enable. system reboot required.\n> sudo systemctl reboot"
    ;;
    "disable" )
      sudo raspi-config nonint disable_overlayfs &&
      echo -e "rootfs ROM is disable. system reboot required.\n> sudo systemctl reboot"
    ;;
    * )
cat << EOS
Raspberry Pi rootfs ROM control
usage: rsfsrom [OPTION]

[OPTION]
  status      :show rootfs rom status. [enable/disable]
  enable      :rootfs rom enable,
               must be user can "sudo raspi-config",
               system reboot required.
  disable     :rootfs rom disable,
               must be user can "sudo raspi-config",
               system reboot required.
EOS
    ;;
  esac
}