To execute a script with oak-run perform following steps
java -jar target/oak-run.jar console --quiet /path/to/segmentstore ":load /path/to/fixAsync.groovy"
You would need to use trunk build of oak-run for this.
$ svn checkout http://svn.apache.org/viewvc/jackrabbit/oak/trunk/
$ cd oak-run
$ mvn clean install