[Gretl-users] working directory

I would like to change working directory dynamically in a script, to the location of the script (*without* knowing where that is). Is there an easy way (for students)? I realize they can change working directory in a shell and set the gretl option to follow this. That's not what Perhaps I'm looking for something like __file__ in Python (e.g., a gretl string `scriptdir` that gretl would set when running a script). Thanks, Alan Isaac