当我使用时：
aws ecs describe-services --services xxxx --region eu-west-1 --cluster yyyyy --query 'services[*].events' --output text
我得到的结果：
2021-11-27T18:32:26.536000+05:00 e5e8d86b-51b3-482e-aa2a-d98aa494a541 (service xxxx) has reached a steady state. 2021-11-27T18:32:26.535000+05:00 e0032964-9976-4f72-b332-1b88475cd13d (service xxxx) (deployment ecs-svc/0725454708180105402) deployment completed. 2021-11-27T18:20:12.797000+05:00 e2cffc87-9ceb-4d7b-9d74-e509d4c416ea (service xxxx) registered 2 targets in (****) ... ...
如何只获取最新消息？像这样：
2021-11-27T18:32:26.536000+05:00 e5e8d86b-51b3-482e-aa2a-d98aa494a541 (service xxxx) has reached a steady state.
events是一个数组，可以进行索引：
aws ecs describe-services --services xxxx --region eu-west-1 --cluster yyyyy --query 'services[*].events[0]' --output text
有关JMSPath中数组切片表达式的更多信息，请参阅此处。