bash loop through instance ids

      #!/bin/bash
      
      wget -O ~/.ssh/devops_id_rsa ${DEVOPS_SSH_PRIVATE_KEY} > /dev/null 2>&1 && chmod 0600 ~/.ssh/devops_id_rsa

      # get bastion IPs
      scratch_ip=$(aws ec2 describe-instances --region "us-west-2" --filters "Name=tag:Name,Values=reputedly-scratch" --query 'Reservations[*].Instances[*].[PrivateIpAddress]' --output text)
      orange_ip_list=$(aws ec2 describe-instances --region "us-west-2" --filters "Name=tag:Type,Values=orange" --query 'Reservations[*].Instances[*].[PrivateIpAddress]' --output text)

      SAVEIFS=$IFS   # Save current IFS
      IFS=$'\n'      # Change IFS to new line
      orange_ips=($orange_ip_list) # split to array $names
      IFS=$SAVEIFS   # Restore IFS

      printf "Converge scratch...\n"
      ssh -t devops@${scratch_ip} "sudo chef-client"

      printf "Converge orange workers...\n"
      for i in "${orange_ips[@]}"
      do
        ssh -t devops@${i} "sudo chef-client"
      done