Batch image resize and watermarking shell script

#!/bin/bash

WATERMARK="watermark700.png"
resize=2000

#Choices include: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast.
WATERMARKPOS=SouthEast

OPACITY=60
QUALITY=85

DIR="."

# "*****************************************"
# "* Image Resize and Watermarking Script  *"
# "*         By Krutant.com                *"
# "*        With some tweaks...            *"
# "*****************************************"

clear

echo
echo "This script will OVERWRITE the source files, so work on a copy!"
echo

if [ $# -eq 1 ]
then

    #-----if there is a parameter----
    DIR="$1"
    echo "Target directory: $DIR"

    else

    echo -n "No parameter, current directory is: "
    pwd
    echo

fi

read -p "Watermark with file \""$WATERMARK"\" & resize all images to width "$resize"? (y/n)  " prompt

if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]

then

 echo ""

 shopt -s nullglob

 for each in $DIR/*{.jpg,.jpeg,.JPG,.JPEG}

 do

  echo -n "Working on "$each" ..."

  convert -resize $resize "$each" "$each" >> /dev/null

  composite -gravity $WATERMARKPOS -quality $QUALITY -dissolve $OPACITY $WATERMARK "$each" "$each" >> /dev/null

  echo "[Done]"

 done

# ---

  echo ""

  read -p "Press Enter to exit ..."

else

 exit 0

fi