#!/usr/local/bin/perl
# xurl - extract unique, sorted lists of links from URL
use HTML::LinkExtor;
use LWP::Simple;

$base_url = shift;
$parser = HTML::LinkExtor->new(undef, $base_url);
$parser->parse(get($base_url))->eof;
@links = $parser->links;
foreach $linkarray (@links) {
  local(@element) = @$linkarray;
  local($elt_type) = shift @element;
  while (@element) {
    local($attr_name, $attr_value) = splice (@element, 0, 2);
    $seen{$attr_value}++;
  }
}
for (sort keys %seen) { print $_, "\n"}