-o option is not working

jar -tf my-ejb-interceptors.jar && java -jar jandex-1.1.0.Final.jar -o jandex.idx my-ejb-interceptors.jar && ls
META-INF/
META-INF/MANIFEST.MF
com/
com/jboss/
com/jboss/examples/
com/jboss/examples/ejb3/
com/jboss/examples/ejb3/interceptors/
com/jboss/examples/ejb3/interceptors/AroundInvokeInterceptor.class
com/jboss/examples/ejb3/interceptors/AroundTimeoutInterceptor.class

Wrote /home/bmaxwell/work/source/git/jandex/target/bmaxwell-jandex-tests/test/my-ejb-interceptors-jar.idx in 0.0180 seconds (2 classes, 2 annotations, 2 instances, 283 bytes)

1. ls shows the idx file was not named jandex.idx as specified in the -o
   jandex-1.1.0.Final.jar my-ejb-interceptors.jar my-ejb-interceptors-jar.idx