delete instances

#!/bin/bash

arr=($(aws ec2 describe-instances --filters "Name=tag-key,Values=Purge" --output table  | grep  InstanceId | awk '{print $4}'))

for index in "${!arr[@]}"
do
  purge_time=$(aws ec2 describe-instances --instance-ids ${!arr[index]})
  if $purge_time = 24h; then
    printf "got one"    
  fi

  printf "deleting server %s\n" ${arr[index]}
  aws ec2 terminate-instances --instance-ids ${arr[index]}
done