Script to batch resize non 9patch images

resize.sh

#!/bin/bash
SRC_DIR=$1; # e.g. res/drawable-xhdpi/
DEST_DIR=$2; # e.g. res/drawable-mdpi/
RESIZE_BY=$3; # e.g. 50%
echo "From $SRC_DIR to $DEST_DIR resize by $RESIZE_BY";
for item in $( ls $SRC_DIR | grep -v '\.9.png$' ); do
    echo Resizing: $item
    convert $SRC_DIR$item  -resize $RESIZE_BY  $DEST_DIR$item
done