systemctl status mssql-server

● mssql-server.service - Microsoft SQL Server Database Engine
   Loaded: loaded (/lib/systemd/system/mssql-server.service; enabled; vendor pre
  Drop-In: /etc/systemd/system/mssql-server.service.d
           └─override.conf
   Active: active (running) since jue 2019-07-25 12:46:02 CEST; 3min 28s ago
     Docs: https://docs.microsoft.com/en-us/sql/linux
 Main PID: 1188 (sqlservr)
   CGroup: /system.slice/mssql-server.service
           ├─1188 /opt/mssql/bin/sqlservr
           └─1513 /opt/mssql/bin/sqlservr