A small project containing some demonstration liquibase scripts. There is an Ant build file showing how to run Liquibase from Ant, and a Groovy script showing how to wrap Liquibase as a command-line tool. Run liquify --options for a list of commands.
The project also contains a SQL script suitable for creating a demo schema to refactor.
You should use these materials as a template only. For a more sophisticated approach, see the Liquibase Workshop files, which contain patterns for Gradle-based Liquibase invocation.