#!/bin/bash

 # Pfad zur DVD/USB-Stick
 datapath=/media/user/UPR_12.04r1
 # Pfad zur Datei mit den MD5-Summen
 md5datapath=/media/user/UPR_12.04r1/md5sum.txt

 data=$(grep "./*" ${md5datapath} | cut -d " " -f 3)

 for i in $data; do
     md5sum ${datapath}/$i >> ./md5sum_new.txt
 done

 sed -i 's/\/media\/user\/UPR_12\.04r1\///g' ./md5sum_new.txt

 diff -s md5sum_new.txt ${md5datapath}
 rm ./md5sum_new.txt