reload shell from bash and continue

reload_bash_shell.sh

if [ -f /var/run/rebooting-for-updates ]; then
  # start from where we left off on reboot
  sed -i '/bash/d' ~/.zshrc
  sudo rm -f /var/run/rebooting-for-updates

  echo "continuing after shell reload.."
else 
  echo "running script for the first time"

  # Preparation for reboot
  script="bash /reload_bash_shell.sh"
  echo "$script" >> ~/.zshrc
  sudo touch /var/run/rebooting-for-updates
  exec zsh
fi