ref: 5086f3453d6716d6dcd782a45831c1ebb0f2b115 dir: /test/p.50/
BEGIN { FS = "\t" } { pop[$4 ":" $1] += $3 } END { for (cc in pop) print cc ":" pop[cc] | "sort -t: -k 1,1 -k 3nr" }