while read inum rest; do
    dest="/mnt/recovered/apr29/${inum}"
    mkdir -p "${dest}"
    python3 dump_tree.py --skip-existing ${inum} "${dest}/" &
    while (( $(jobs -r | wc -l) >= 10 )); do
        wait -n 2>/dev/null || sleep 0.2
    done
done < true_roots.txt
wait
echo "All done"