(Quick Reference) # 4.1.1 Options for the YML format Config Version: 3.2.8 ## 4.1.1 Options for the YML format Config `application.yml` was introduced in Grails 3.0 for an alternative format for the configuration tasks. ### Using system properties / command line arguments Suppose you are using the `JDBC_CONNECTION_STRING` command line argument and you want to access the same in the yml file then it can be done in the following manner:
    production:
        dataSource:
            url: '${JDBC_CONNECTION_STRING}'
Similarly system arguments can be accessed. You will need to have this in `build.gradle` to modify the `bootRun` target if `grails run-app` is used to start the application
    bootRun {
        systemProperties = System.properties
    }
For testing the following will need to change the `test` task as follows
    test {
        systemProperties = System.properties
    }
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