Specify the password for the 'heat' MySQL user that the script will use to connect to the 'heat' MySQL database. By default, the password 'heat' will be used.
Specify the root MySQL password. If the script installs the MySQL server, it will set the root password to this value instead of prompting for a password. If the MySQL server is already installed, this password will be used to connect to the database instead of having to prompt for it.
In cases where the script would normally ask for confirmation before doing something, such as installing mysql-server, just assume yes. This is useful if you want to run the script non-interactively.