Thanks for your answer, I got it working now :D

For future reference, this is how I ended up doing it:

import net.sourceforge.tuned.TeePrintStream

// Open log file
scriptlog = new FileOutputStream(new File("logfile.log"),true)

// Stream output to log file
System.setOut(new TeePrintStream ...

Hello

First off, thanks for making such an awesome program! I've been working on automating my media workflow using filebot and it's groovy scripts, I've made a lot of small custom scripts and now I would like to combine them in a postproccesing script.

In my scripts I use different logging levels ...