Récupérer le MD5 des fichiers

EXTENSION="png"

echo '' > md5sum.txt

for file in *.$EXTENSION;
do
    echo "Processing $file"
    md5sum "$file" >> md5sum.txt
done

echo '' > md5only.txt
while read p; do
  echo $p | cut -f 1 -d ' ' >> md5only.txt
done <md5sum.txt

sort md5only.txt | uniq -cd