dedup-img - Bild-Duplikate trotz unterschiedlicher
       Meta-Daten eliminieren
       dedup-img Pfad...
       Durchsucht die angegebenen Pfade nach Duplikaten. Von
       jedem Bild wird eine Version ohne Meta-Daten
       erstellt, welches zur Identifizierung von Duplikaten
       genutzt wird. So werden auch Duplikate gefunden, die
       sich anhand von Meta-Daten unterscheiden. Die Version
       mit dem meisten Meta-Daten wird als einzige behalten.

IFS=$'\n'; # necessary for loop to handle spaces
s=0; # initial value for freed space
hash=''; # invalid initial hash value
# get every file in given directories and subdirectories, calculate HASH of image without meta data and print hash, size of file and path.
for f in $(find -H "$@" -type f -exec bash -c 'file="{}"; echo -n $(exiftool -all= -o - "$file" 2> /dev/null | sha512sum | cut -c 1-128)' \; -printf "\t%s\t%p\n" |
# ignore unsupported files (sha512sum of empty string)
grep -v "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e" |
# sort the output by hash and descending size
sort -k1,2r |
# remove rows with unique hashes and keep all rows with repeated hashes
uniq -w128 --all-repeated=separate);
# for every entry in output set sha to hash value of a file 
do sha=$(echo "$f" | cut -f 1);
# and path to the path of a file
path=$(echo "$f" | cut -f 3);
# if hash of last file equals hash of current file
if [ "$hash" == "$sha" ];
# then add size of file to s
then s=$1)$s+$(stat --printf="%s" $path%MINIFYHTMLf99f424a91a410d4d308ad3cc34bf9a913%);
# remove file
rm "$path";
# and print, that file was removed
echo "removed $path";
# else set hash to the new hash value, that is the first hash of new group of redundant files
else hash=$sha;
# print: keep file (this file may have the most meta-data, because it has the biggest size and the picture is identical)
echo "keep $path";
# prints how many bytes could be freed
echo "$s Byte more free space";

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