Bash script to deleted wordpress attachments that have a bad URL (WIP)

verify_attachment_url.sh

#!/usr/bin/bash

BASE_URL="https://myourdomain.com/files/"

# We need to be able to trap breakouts
trap exit_script INT

function exit_script() {
  end=`date +%s.%N`
  runtime=$( echo "$end - $start" | bc -l )
  echo " "
  echo $MESSAGE
  echo "Last Record Processed: "$LAST_PROCESSED
  echo "Elapsed Time: "$runtime
  echo "Processed: "$PROCESSED
  echo "Deleted: "$DELETED
  exit 1
}

start=`date +%s.%N`
LOW=$1
HIGH=$2
PROCESSED=0
DELETED=0
LAST_PROCESSED=0
MESSAGE=""

if [ $LOW -gt $HIGH ]; then
  MESSAGE="Inverted range: $LOW > $HIGH"
  exit_script
fi

for ID in $(wp post list --order=ASC --post_type='attachment' --format=ids);
do
#echo $ID

  # Exit script if $ID is 0, meaning no return values
  if (( $ID == 0 )); then
    MESSAGE="No records found."
    exit_script
  fi

  # We only want to process $IDs within a range if range given
  # We must be greater or equal to $LOW
  if [ ! -z $LOW ]; then
    #echo "Low has value"
    if [ $ID -lt $LOW ]; then
      #echo "$ID LESS THAN $LOW"
      continue
    fi
  fi
    # We must be lower or equal to $HIGH
  if [ ! -z $HIGH ]; then
    #echo "High has value"
    if [ $ID -gt $HIGH ]; then
      #echo "$ID GREATER THAN $HIGH"
      MESSAGE="Upper limit of range reached"
      exit_script
    fi
  fi

  # Get the url for the attachments file
  LAST_PROCESSED=$ID
  PROCESSED=$((PROCESSED+1))
  IMAGE_URL=$(wp post meta get $ID _wp_attached_file)

  # We want to check remote access through the CND
  # so prepend the cdn
  IMAGE_URL=$BASE_URL$IMAGE_URL

  # run the url through curl and return the http code
  CODE=$(curl -s -o /dev/null -I -w "%{http_code}" $IMAGE_URL)
  # if the http code is a 404
  if [ $CODE == "404" ]; then
    # Delete the attachment
    DELETED_RESPONSE=$(wp post delete $ID --force --defer-term-counting)
    echo $DELETED_RESPONSE
    DELETED=$((DELETED+1))
  fi
done
wait
exit_script