systemctl status mysql

这个命令用于查看 MySQL 服务的状态，包括是否在运行、最近的启动时间、运行时间等信息。可以在终端中输入该命令进行查看。例如：

systemctl status mysql

如果 MySQL 服务正在运行，则会显示：

● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2021-10-08 15:38:32 CEST; 2 days ago
 Main PID: 1194 (mysqld)
    Tasks: 38 (limit: 4915)
   CGroup: /system.slice/mysql.service
           └─1194 /usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid

Oct 08 15:38:31 ubuntu systemd[1]: Starting MySQL Community Server...
Oct 08 15:38:32 ubuntu systemd[1]: Started MySQL Community Server.

如果 MySQL 服务没有运行，则会显示：

● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Fri 2021-10-08 15:38:32 CEST; 2 days ago
 Main PID: 1194 (code=exited, status=0/SUCCESS)

Oct 08 15:38:31 ubuntu systemd[1]: Starting MySQL Community Server...
Oct 08 15:38:32 ubuntu systemd[1]: Started MySQL Community Server.

可以根据这些信息来判断 MySQL 服务是否正常运行。