#!/bin/sh

echo .::127.53.0.1

sort -u | awk '
  BEGIN { FS = ":"; OFS = ":" }
  {
    c = substr($0,1,1)
    q = substr($1,2)

    if (c == "#") next
    if (c == ":") next
    if ($1 == "Z.") next
    if ($1 == "&.") next
    if (($1 == "") && ($2 == ".")) next
    if (c == "+") {
      ip[q] = $2 ":" ip[q]
      next
    }
    if (c == "&") {
      ns[q] = substr($3,1,length($3) - 1) ":" ns[q]
      next
    }
    print "weird line: " $0
    exit 1
  }
  END {
    for (q in ns) {
      split(ns[q],x)
      for (i in x) {
        split(ip[x[i]],y)
        for (j in y) {
          if (y[j] != "") {
            print "&" q "::" y[j]
          }
        }
      }
    }
  }
'