Check a specific EC2 Instance Type in All Availability Zones

instance-types.sh

#!/bin/bash                                                                        

check_instance_type="m5.large"
product_description="Linux/UNIX"

echo > instance-types.csv                                                                                   
echo "Getting list of Availability Zones"                                          
all_regions=$(aws ec2 describe-regions --region us-east-1 --output text --query 'Regions[*].[RegionName]' | sort)
all_az=()                                                                          
                                                                                   
while read -r region; do                                                           
  echo "Checking region $region"
  az_per_region=$(aws ec2 describe-availability-zones --region $region --query 'AvailabilityZones[*].[ZoneName]' --output text | sort)
                                                                                   
  while read -r az; do                                                             
    all_az+=($az)                                                                  
  done <<< "$az_per_region"                                                        
done <<< "$all_regions"                                                            
                                                                                   
counter=1                                                                          
num_az=${#all_az[@]}                                                               

for az in "${all_az[@]}"                                                           
do                                                                                 
  echo "Checking Availability Zone $az ($counter/$num_az)"                         
                                                                                   
  region=$(echo $az | rev | cut -c 2- | rev)                                       
  raw=$(aws ec2 describe-reserved-instances-offerings --instance-type $check_instance_type --region $region --availability-zone $az --no-include-marketplace --product-description $product_description)
  instance_types=$(echo $raw | jq '.ReservedInstancesOfferings[] | .InstanceType' | sort -u)
                                                                                   
  while read -r instance_type; do                                                  
    echo "$region;$az;$instance_type" >> instance-types.csv                        
  done <<< "$instance_types"                                                       
                                                                                   
  counter=$((counter+1))                                                           
done 
echo "See instance-types.csv"