find . -type f -exec md5 {} \; | sort -t\=  -k 2 | awk -F" = " '
{ gsub(/^MD5\ \(|\)$/,"",$1) }
$2 != b { a=$1 ; f=0 }
$2 == b {
        f++
        if (f==1) {
                print "#Same files below#"
                print a
        }
        print $1
}
{ b=$2 }
'