command.sh

aws ec2 describe-account-attributes --region eu-west-1 | jq '.["AccountAttributes"] | reduce .[] as $item ( {}; (. + {"\($item.AttributeName)": $item.AttributeValues[].AttributeValue}))'

describe-account-attributes.json

{
    "AccountAttributes": [
        {
            "AttributeName": "vpc-max-security-groups-per-interface", 
            "AttributeValues": [
                {
                    "AttributeValue": "5"
                }
            ]
        }, 
        {
            "AttributeName": "max-instances", 
            "AttributeValues": [
                {
                    "AttributeValue": "20"
                }
            ]
        }, 
        {
            "AttributeName": "supported-platforms", 
            "AttributeValues": [
                {
                    "AttributeValue": "VPC"
                }
            ]
        }, 
        {
            "AttributeName": "default-vpc", 
            "AttributeValues": [
                {
                    "AttributeValue": "vpc-49cc3c2c"
                }
            ]
        }, 
        {
            "AttributeName": "max-elastic-ips", 
            "AttributeValues": [
                {
                    "AttributeValue": "5"
                }
            ]
        }, 
        {
            "AttributeName": "vpc-max-elastic-ips", 
            "AttributeValues": [
                {
                    "AttributeValue": "5"
                }
            ]
        }
    ]
}

output.json

{
  "vpc-max-elastic-ips": "5",
  "max-elastic-ips": "5",
  "default-vpc": "vpc-49cc3c2c",
  "supported-platforms": "VPC",
  "max-instances": "20",
  "vpc-max-security-groups-per-interface": "5"
}

region-attributes.zsh

#!/bin/zsh
regions=(ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2)

for region in $regions; do
  echo $region
  aws ec2 describe-account-attributes --region $region | jq '.["AccountAttributes"] | reduce .[] as $item ( {}; (. + {"\($item.AttributeName)": $item.AttributeValues[].AttributeValue}))'
  echo
done