ref: 07f04384230b0c4cb8c47da7b5a6aebdea992b1e dir: /testdir/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" }