Aus dem Leben eines Informatikers

sed 's/  /@/g' ../sha256sums.txt
cut -d @ -f 1 sha256sums.txt | uniq -d | sort -u > doubles_sha256sums.txt
for i in $(cat doubles_sha256sums.txt)
do
   doubles=$(grep $i sha256sums.txt | cut -d @ -f 2)
   echo "   "
   echo $doubles
   #actually do something with the list of !probably! identical files.
   #use some kind of binary diff tool to verify that the files are 
   #actually identical
done