rds stop start script

rds-stop-start-instance.sh

#!/bin/bash

function start-stopRDSInstance {
  case ${1} in
    stop)
      action=stop
    ;;
    start)
      action=start
    ;;
    *)
      echo "No such action exiting"
      exit -1
  esac

  databases=$(aws rds describe-db-instances --query 'DBInstances[*].DBInstanceIdentifier' --output text)
  arn="arn:aws:rds:us-east-1:291674496808:db"

  for db in ${databases[@]};
  do 
    db_env_tag=$(aws rds list-tags-for-resource --resource-name ${arn}:${db} | jq -r '.[][]|select(.Key=="Environment") | .Value')
    if [[ "${env}" == "${db_env_tag}" ]]; 
    then
      echo aws rds ${action}-db-instance --db-instance-identifier $db
      if [[ $? -ne 0 ]]; 
      then
        echo "fatal error shutting down instance ${db}"
      fi
    fi
  done
}

function main {
  action=$1
  env=$2
  start-stopRDSInstance ${action} ${env}
}

main ${@}

script is not working