bash function to delete ec2 instances based on private DNS names

ec2_terminate.sh

ec2_terminate() {
  local private_dns_name=$1
  local instance_ids=$(aws ec2 describe-instances \
    --filters "Name=private-dns-name,Values=$private_dns_name" | \
    jq '.Reservations | .[] | .Instances | .[] | .InstanceId' -r | tr '\n' ' ')

  if [ -z $instance_ids ]; then
    echo "instances not found for $private_dns_name"
    exit 1
  fi

  echo "Terminating EC2 Instances:$instance_ids\n"
  local cmd="aws ec2 terminate-instances --instance-ids $instance_ids"
  echo $cmd
  bash -c $cmd
}