<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>com.github.genthaler</groupId>
        <artifactId>beanshell-maven-plugin</artifactId>
        <version>1.4</version>

        <configuration>
         <script><![CDATA[
          import org.codehaus.plexus.util.FileUtils;
          FileUtils.fileWrite( "touched.txt", "This is a Beanshell Maven Plugin POM test" );
         ]]></script>
        </configuration>

      </plugin>
      [...]
    </plugins>
    [...]
  </build>
  [...]
</project>