ref: 8f2d3879a9c66d2633ca7ec1c3b0495981feb04f 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" }