list

   1 #! /usr/bin/awk -f
   2
   3 BEGIN {
   4     sep = sep ? sep : " "
   5     end = end ? end : ""
   6 }
   7
   8 ! /^\#/ && ! /^$/ {
   9     xs[$1]++
  10 }
  11
  12 END {
  13     _sep = ""
  14     for (x in xs) {
  15         if (xs[x] > 1) {
  16             printf ">>> [WARNING] : '%s' was listed %d times.\n", x, xs[x] > "/dev/stderr"
  17         }
  18         printf("%s%s", _sep, x)
  19         _sep = sep
  20     }
  21     printf "%s", end
  22 }