Liquibase can read paramaters for its execution from standard Java Property files. A simple liquibase.properties file would look like this:
driver: oracle.jdbc.OracleDriver classpath: ../ojdbc14.jar url: jdbc:oracle:thin:@localhost:1521:XE username: tbd password: tbd
Note that paths are relative to the current directory.
For each property defined in the file that matches a property in the goal being invoked that property of the goal will be set.