#! /usr/local/bin/perl
#
#  cnames - prints the (different) nicknames contained in CNAME RR's
#	    These names should be absolute (see expand)
#
#               The names should be absolute (see expand)
#
#  Copyright (C) 1992, 1993 PUUG - Grupo Portugues de Utilizadores
#                                  do Sistema UNIX
#                1992, 1993 FCCN - Fundacao para o Desenvolvimento dos Meios 
#                                  Nacionais de Calculo Cientifico 
#
#  Authors: Jorge Frazao de Oliveira <frazao@puug.pt>
#           Artur Romao <artur@dns.pt>
#
#  This file is part of the DDT package, Version 2.0.
#
#  Permission to use, copy, modify, and distribute this software and its 
#  documentation for any purpose and without any fee is hereby granted, 
#  provided that the above copyright notice appear in all copies.  Neither 
#  PUUG nor FCCN make any representations about the suitability of this
#  software for any purpose.  It is provided "as is" without express or 
#  implied warranty.


$, = ' ';		# set output field separator
$\ = "\n";		# set output record separator

while (<STDIN>) {
    	if (/\tCNAME\t/) {
	    	($Name) = split(" ", $_);

		$cname{$Name} = 1;
    	}
}

foreach $cn (keys %cname) {
    	print $cn;
}

