code: func (agent *ecsAgent) printECSAttributes() int {
  	capabilities, err := agent.capabilities()
  	if err != nil {
  		seelog.Warnf("Unable to obtain capabilities: %v", err)
  		return exitcodes.ExitError
  	}
  	for _, attr := range capabilities {
  		fmt.Printf("%s\t%s\n", aws.StringValue(attr.Name), aws.StringValue(attr.Value))
  	}
  	return exitcodes.ExitSuccess
  }
docs: // printECSAttributes prints the Agent's ECS Attributes based on its
  // environment