例如

 

journalctl -u prometheus-webhook-dingtalk -n 20 --no-pager

journalctl -u prometheus-webhook-dingtalk -n 20 --no-pager --since today

journalctl -u prometheus-webhook-dingtalk -n 20 --no-pager --since "2020-08-26 05:25" --until "2020-08-26 05:30"

journalctl -u prometheus-webhook-dingtalk -n 20 --no-pager --since "5 minutes ago"

journalctl -u prometheus-webhook-dingtalk -n 20 --no-pager --since "2 hours ago"

 

-u是--unit的缩写

-n是行数，默认是10行

--no-pager 改为正常的标准输出