gphoto2: {...rectory/camera-control} /store_00020001/DCIM/100CANON> get-thumbnail IMG_0001.JPG
Downloading 'IMG_0001.JPG' from folder '/store_00020001/DCIM/100CANON'...
Saving file as thumb_IMG_0001.jpg
It is not documented on the MAN page that this command has an argument, which is the file name on the camera.
i fixed the documentation
done