Darktable batch export example

darktable-export.sh

# Some docs imly source can be a directory, but it does not work actually.
# Below is a workaround
for p in a-source-folder/*
do
  # Note that uppercase JPG suffix is not recognized so adding "jpg" to output file name.
  darktable-cli --width 3000 --height 3000 --hq true $p $(dirname $p)-export/$(basename ${p%.JPG}.jpg); 
done