[root@ip-10-10-100-4 cron.d]# aws ec2 describe-tags \

        --filters "Name=resource-id,Values=$INSTANCE_ID" "Name=key,Values=$IAM_AUTHORIZED_GROUPS_TAG" \
        --query "Tags[0].Value" \
        --output text \

You must specify a region. You can also configure your region by running "aws configure".