gdal_fillnodata.py --version (return code: 0)
GDAL 2.2.1, released 2017/06/23
gdal_fillnodata.py -HELP (return code: 1)
gdal_fillnodata [-q] [-md max_distance] [-si smooth_iterations]
[-o name=value] [-b band]
srcfile [-nomask] [-mask filename] [-of format] [-co name=value]* [dstfile]