This shell script will batch create image thumbnails, 100x100, preserving aspect ratio, for images in a directory of images. imagemagick is required! To run: bash ./batch_thumbnail_creator.sh

create_image_cache.sh

#!/bin/sh

for filename in *
do
	if [ "$filename" != "cache" -a "$filename" != "create_cache.sh" -a ! -f "cache/${filename}" 
]; then
		mkdir "cache/${filename}"
	fi
done
 
for filename in **/*
do
	thebasename="${filename%.*}"
	extension="${filename##*.}"
	thumbname="cache/${thebasename}-thumb.${extension}"
	if [ "$extension" == "jpg" -o "$extension" == "png" -o "$extension" == "jpeg" ]; then
		convert "${filename}" -thumbnail '100x100' "${thumbname}"
	fi
done
echo "Done"