With dbmcli utility, you can retireve the server configuration details, metric information and configure SMTP server details, start / stop the server etc.

For more details, read the Oracle documentation: https://docs.oracle.com/cd/E80920_01/DBMMN/exadata-dbmcli.htm#DBMMN22063 

Read the complete post at jaffardba.blogspot.com/.../dbmcli-utility.html