AWS: CLI for deleting vpc with dependencies

#!/bin/bash

[ -z "$1" ] && echo "delete-vpc VPC_NAME" && exit

vpcs=$(aws ec2 describe-vpcs --query Vpcs[].[VpcId] --filters "Name=tag:Name,Values=$1" --output text)

[ -z "$vpcs" ] && exit

while read -r vpcID; do
    echo "Deleting dependencies for vpc (${vpcID})"

	instances=$(aws ec2 describe-instances --filters "Name=vpc-id,Values=$vpcID" --query  Reservations[].Instances[].[InstanceId] --output text)
	echo **$instances**
	[ ! -z "$instances" ] && echo "...instances detected on vpc $vpcID, skipping." && continue

	aws ec2 describe-subnets --query Subnets[].[SubnetId] --filters "Name=vpc-id,Values=$vpcID" --output text |
      while read subnetID; do
        echo "...deleting subnet (${subnetID}) ..."
        aws ec2 delete-subnet --subnet-id ${subnetID}
      done

    aws ec2 describe-security-groups --filter "Name=vpc-id,Values=$vpcID" --query SecurityGroups[].[GroupId] --output text |
      while read sgID; do
        echo "...deleting security group (${sgID}) ..."

        aws ec2 delete-security-group --group-id ${sgID}
      done

    aws ec2 describe-internet-gateways --filter "Name=attachment.vpc-id,Values=$vpcID" --query InternetGateways[].[InternetGatewayId] --output text |
      while read igwID; do
        echo "...deleting internet gateway (${igwID}) ..."

        aws ec2 detach-internet-gateway --internet-gateway-id=${igwID} --vpc-id=${vpcID}
        aws ec2 delete-internet-gateway --internet-gateway-id=${igwID}
      done

    aws ec2 describe-route-tables --filter "Name=vpc-id,Values=$vpcID" --query RouteTables[].[RouteTableId] --output text |
      while read routeID; do
        echo "...deleting route table (${routeID}) ..."

        aws ec2 delete-route-table --route-table-id ${routeID}      &>/dev/null
      done

    echo "Deleting vpc (${vpcID})"
    aws ec2 delete-vpc --vpc-id ${vpcID}

done <<< "$vpcs"