aws_list_all_ec2

#!/usr/bin/env bash
# description: lists EC2 instances in ALL regions.
# credit: https://github.com/aws/aws-cli/issues/1777

for region in `aws ec2 describe-regions --query Regions[*].[RegionName] --output text`
do
     echo -e "\nListing Instances in region:'$region'..."
     aws ec2 describe-instances --region $region
done