One Linux server starts multiple data instances

A Linux server needs to start multiple data instances, such as DB1 and DB2.

Method:
Export Oracle_SID = DB1
Sqlplus '/as sysdba' <startup
Exit
!

Export ORACLE_SID = DB2
Sqlplus '/as sysdba' <startup
Exit
!

For different listening ports, the method for starting the listening port is lsnctl start listener1/linsterner2/
About listener? You can view the configuration file through lsnctl status, and then edit it.

If the port is the same, you only need to start lsnctl start.

You can change SID startup for web configuration startup.
Export ORACLE_SID = DB1
Emctl start dbconsole