Map contigs against itself with MUMmer. Then find duplicate contigs

mummer_duplicate_contigs

for row in $(cat nucmer.coords | awk -v OFS=, '{if ($10 == 100.00 && $11 == 100.00 && $7 == 100.00 && $12 != $13) {print $12,$13}}')
do
    echo $row | tr ',' '\n' | sort | tr '\n' ',' | sed 's/,$//'
    echo
done | cut -d, -f2 | sort -u > duplicatecontigs.txt