ref: 1eae6de89dda9f3613ea0ae660e7d5d05b107276 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" }