rsync list of files specified within a file
1. Make a back-up in case any problems arise so you can revert back to the start.
2. Ensure that the file permissions on the files directory give permission for the products image files to be deleted.
cd /var/www/html/drupal/shop/sites/default/
chown -Rv mreid.mreid files
chmod -Rv 777 files
3. Remove all existing products from the shop