Bulk resize images in directories preserving modification date timestamps

bulk-resize-images.sh

#!/usr/bin/env bash

for directory in */ ; do
  dirTimestamp="$(GetFileInfo -d "$directory")"

  (
    cd "$directory"
    # In this case img files have no extensions
    for fileName in `find . -type f -maxdepth 1 ! -name "*.*"`; do
      fileTimestamp="$(GetFileInfo -d "$fileName")"

      sips --resampleWidth 800 "$fileName"

      SetFile -m "$fileTimestamp" -d "$fileTimestamp" "$fileName"
    done
  )

  SetFile -m "$dirTimestamp" -d "$dirTimestamp" "$directory"

  echo "$directory $dirTimestamp"
done

exit 0