bash script to resize an image to multiple sizes with one command using ImageMagick

resize_many.sh

#!/bin/bash

# Usage: ./resize_many.sh <filename> <sizes...>
# e.g. ./resize_many.sh myasset.png 10x10 20x20 30x30
#      produces 3 files, myasset10x10.png myasset20x20.png myasset30x30.png

fullname=$1
shift;
sizes=$*
extension="${fullname##*.}"
filename="${fullname%.*}"

for size in $*
do
convert $fullname -resize $size $filename$size.$extension
done