list all AWS AZs with aws-cli

list_aws_az.sh

$ aws ec2 describe-regions --query 'Regions[*].RegionName' --output table | awk '$2 ~/-/{print $2}' | while read region; do aws ec2 describe-availability-zones --region $region --query AvailabilityZones[*].ZoneName --output table; done | awk '$2 ~/-/{print $2}'
ap-south-1a
ap-south-1b
eu-west-1a
eu-west-1b
eu-west-1c
ap-southeast-1a
ap-southeast-1b
ap-southeast-2a
ap-southeast-2b
ap-southeast-2c
eu-central-1a
eu-central-1b
ap-northeast-2a
ap-northeast-2c
ap-northeast-1a
ap-northeast-1b
ap-northeast-1c
us-east-1a
us-east-1b
us-east-1c
us-east-1d
us-east-1e
sa-east-1a
sa-east-1b
sa-east-1c
us-west-1a
us-west-1b
us-west-1c
us-west-2a
us-west-2b
us-west-2c