minimal_assignment.sh

function last_difference
{
    grep -n "${pattern}" "${parse_file}" \
        | tail -1 | awk '{print $1}' |\
        cut -d ":" -f1
}


function all_differences
{
    cat "${parse_file}" | awk 'NR>="$(last_difference)"'
}


function duplicates
{
    echo "" > _tmp_dup.txt
    while read x; do
        # take only the paths
        echo "${x}" | awk '{print $3}' >> _tmp_dup.txt
    done
    # get only the duplicates
    cat _tmp_dup.txt | awk '++A[$1]==2'
}

function only_once
{
    diff  <(all_differences | awk '{print $3}' | uniq )\
         <(all_differences | duplicates)
}