debian-cd-clone/tools/imagesums

#!/bin/bash

cd $1

:> MD5SUMS

case $DOJIGDO in
	0)
		for file in `find * -name \*.iso`
		do
			md5sum $file >> MD5SUMS
		done
		;;
	1|2)
		for file in `find * -name \*.template`
		do
			if [ "`tail --bytes=33 "$file" | head --bytes=1 | od -tx1 -An | sed -e 's/ //g'`" != 05 ]; then
				echo "Possibly invalid template $file"
				exit 
			fi
			grep -q " ${file%%.template}.iso"'$$' MD5SUMS \
				 || echo "`tail --bytes=26 "$file" | \
					head --bytes=16 | \
					od -tx1 -An | \
					sed -e 's/ //g'`  ${file%%.template}.iso" >> MD5SUMS
		done
		;;
	*)
		echo "DOJIGDO not defined!"
		exit 1
		;;
esac

# Likewise, the file size can be extracted from the .template with:
# tail --bytes=32 $$file | head --bytes=6 | od -tx1 -An \
#  | tr ' abcdef' '\nABCDEF' | tac | tr '\n' ' ' \
#  | sed -e 's/ //g; s/^.*$/ibase=16 & /' | tr ' ' '\n' | bc