list all the AWS instances that are missing the SSM agent

ssmdescribe.sh

#!/bin/bash
for instance in $(aws ec2 describe-instances --query 'Reservations[*].Instances[*].[InstanceId]' --output text )
do
  managed=$(aws ssm describe-instance-information  --filters "Key=InstanceIds,Values=$instance" --query 'InstanceInformationList[*].[AssociationStatus]' --output text)
  if [[ "$managed" != "Success" ]]; then 
  managed=" Not Managed"; 
fi
aws ec2 describe-instances --instance-id $instance --output text --query 'Reservations[*].Instances[*].[InstanceId, Placement.AvailabilityZone, [Tags[?Key==`Name`].Value] [0][0], [Tags[?Key==`App`].Value] [0][0], [Tags[?Key==`Product`].Value] [0][0], [Tags[?Key==`Team`].Value] [0][0] ]' 
echo "  $managed"
done