delete-default-vpcs.sh

#!/bin/bash

set -eou pipefail

regions=$(aws ec2 describe-regions --query="Regions[].RegionName" --output=text)
for region in $regions
do
  vpc_id=$(aws ec2 describe-vpcs --region=$region --filter="Name=is-default,Values=true" --query="Vpcs[].VpcId" --output=text)
  if ! [ -z $vpc_id ]
  then
    echo "Deleting $vpc_id in $region"

    subnet_ids=$(aws ec2 describe-subnets --region=$region --filter="Name=vpc-id,Values=$vpc_id" --query="Subnets[].SubnetId" --output=text)
    for subnet_id in $subnet_ids
    do
      echo "Deleting subnet $subnet_id in $region"
      aws ec2 delete-subnet --region=$region --subnet-id="$subnet_id"
    done

    igw_ids=$(aws ec2 describe-internet-gateways --region="$region" --filter="Name=attachment.vpc-id,Values=$vpc_id" --query="InternetGateways[].InternetGatewayId" --output=text)
    for igw_id in $igw_ids
    do
      echo "Deleting igw $igw_id in $region"

      aws ec2 detach-internet-gateway --region="$region" --internet-gateway-id="$igw_id" --vpc-id="$vpc_id"
      aws ec2 delete-internet-gateway --region="$region" --internet-gateway-id="$igw_id"
    done

    aws ec2 delete-vpc --region="$region" --vpc-id="$vpc_id"
  fi
done