This is a shellscript to be used with the Android-Sketch workflow as described in the following medium article: https://medium.com/@lmindler/using-sketch-3-and-a-bit-of-fairy-dust-for-a-better-android-workflow-f667d0048855#.wvtamf346

cleanup.sh

cd ../Desktop/res/; mkdir -p drawable-xxhdpi; mkdir -p drawable-xhdpi; mkdir -p drawable-hdpi; mkdir -p drawable-mdpi
  
for file in $(find . -type f -iname '*-xxhdpi*'); do
  mv "$file" "drawable-xxhdpi/${file/-xxhdpi/}";
done
for file in $(find . -type f -iname '*-xhdpi*'); do
  mv "$file" "drawable-xhdpi/${file/-xhdpi/}";
done
for file in $(find . -type f -iname '*-hdpi*'); do
  mv "$file" "drawable-hdpi/${file/-hdpi/}";
done
for file in $(find . -type f -iname '*-mdpi*'); do
  mv "$file" "drawable-mdpi/${file/-mdpi/}"
done