find . -type f -exec cksum {} \; | sort | tee /tmp/f.tmp | cut -f 1,2 -d ' ' | uniq -d | grep -hif /dev/stdin /tmp/f.tmp > duplicates-report.txt
sort -k1,1 duplicates-report.txt --stable | gawk -F' ' '{if ( $1==old ) { print $3 }; old=$1; }' > duplicates-only.txt | xargs rm