This script will delete all Canon RAW (CR2) files in a folder when the corresponding JPG is unrated. The purpose is to keep only Raw files for photos which are worth it (assuming you have gone through the effort of rating the JPG). I'm using this script with Digikam in my photo workflow.

keepRawForRatedPhotos.sh

#!/bin/bash
#
# This script will delete all Canon RAW (CR2) files in a folder when the corresponding JPG is unrated.
# The purpose is to keep only Raw files for photos which are worth it
# (assuming you have gone through the effort of rating the JPG)
#
# It requires a filename as argument. It is meant to be called through a "context menu"
# (right-click) on a CR2 file.
#
# Example .desktop file for KDE (to be placed in ~/.local/share/applications/myRawCleaner.desktop)
#  [Desktop Entry]
#  Name=Keep CR2 for rathed photos
#  Exec=/usr/bin/konsole -e /bin/bash ~/Scripts/keepRawForRatedPhotos.sh %F   # <-- adjust the script location here
#  Type=Application
#  MimeType=image/x-canon-cr2
#  Terminal=false
#
# **WARNING**
# Make sure to be in the right folder before running this script,
# because it will trash all Raw files with no matching rated JPG
#
# Requires:
#   exiftool
#   trash-cli

# Check that first argument is a file, then extract folder name
if [ -e "$1" ]; then
  ALBUM=$(dirname "$1")
else
  # Otherwise exit
  exit 1
fi

# Check requirements
hash exiftool 2>/dev/null || { echo >&2 "I require exiftool but it's not installed.  Aborting."; exit 1; }
hash trash-put 2>/dev/null || { echo >&2 "I require trash-put but it's not installed.  Aborting."; exit 1; }

# List all rated JPG file in the folder
cd "$ALBUM"
RATED_JPG=`exiftool -m -if '$Rating' *.JPG -q -p '$FileName'`

if [[ -z "$RATED_JPG" ]]; then
  echo "No rated photos"
else

  # Create 'Raw' sub-folder if it doesn't exist
  if [ ! -d Raw ]; then
    mkdir Raw
  fi

  # Set line break as field separator and loop throuh all rated JPG files
  IFS=$'\n'
  for JPG in $RATED_JPG
  do
    CR2=${JPG::-4}'.CR2'

    if [ -f "$CR2" ]; then
      echo 'Moving '$CR2
      mv $CR2 Raw
    fi
  done

fi

# Trash remaining Raw files in current folder (needs trash-cli package)
trash-put *.CR2

# Wait for a key press before exiting
read -n 1 -s -r -p "Press any key to continue"