@mdf , thank you. I read your guide. The whole thing.
Lots of good stuff there.
Thanks so much.
My duck.log just has OK in it.
Does the duck.log file only contain the latest result of the script?
Its set to run every 5 minutes, but is there any way of knowing if that is actually happening?
EDIT : I think I worked out a way.
If I use WinSCP I can see the timestamp of duck.log, and it does change roughly every 5 minutes.
Life is too short to remove USB safely.