ref: 681f270acd130d2c0d6aa78e1caf9dc3a1fcc3fb 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" }