This little bash script is useful to manage and sort photo in bulk, once you deleted all the unwanted JPEG image, run the script in the folder to delete all the corresponding raw file

photo_raw_jpeg_file_keeper.sh

#!/bin/bash
mkdir unwanted #create a directory to store unwanted file
for file in *.NEF; do #for each .NEF find a .JPG file that as the same name
  jpg_file="${file%.*}.JPG"
  if [ ! -e "$jpg_file" ]; then #if a .NEF does not have a corresponding .JPEG file, move the .NEF file in the folder
    mv "$file" ./unwanted/"$file"
  fi
done