Terminal: Use image information from sips for renaming files - bash

Question

The command sips has a great option to read information from files. The following command loops through all images and shows information on the width or height:
for i in *.jpg; do sips -g pixelWidth $i;done
for i in *.jpg; do sips -g pixelHeight $i;done
Now I would like to read this information and use it with mv to rename the images like so:
image-widthxheight.jpg
image-1600x900.jpg
The final thing I want accomplish is, to use sips to resize images and write the new information directly into the filename.
Has anybody an idea, how I can extract the information from width and height and use it together with mv?

Answer 1

I found it out myself. It's a nice bash script now. Maybe not so elegant, but it works – It's also available as a gist on GitHub.
NEW VERSION THANKS TO THE ADVICE – SEE COMMENTS
#!/bin/bash
#
# 1. This script copies all *.jpg-files to a new folder
# 2. Jumps into folder and resizes all files with sips
# 3. Renames all files and uses information from sips
#
folder="resized_and_renamed"
mkdir -p "$folder"
cp *.jpg "$folder"
cd "$folder"
# RESIZE ALL IMAGES TO MAXIMUM WIDTH/HEIGHT OF 360
sips -Z 360 *.jpg
# RENAME FILES WITH INFORMATION FROM SIPS
for i in *.jpg
do
pixelWidth=$(sips -g pixelWidth "$i" | awk '/pixelWidth:/{print $2}')
pixelHeight=$(sips -g pixelHeight "$i" | awk '/pixelHeight:/{print $2}')
# REMOVE EXTENSION
filename=${i%.jpg}
# NOW RENAME
mv $i ${filename##*/}-${pixelWidth}x${pixelHeight}.jpg
done