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  1. or download this
    if ($hosts->{$ip}) {
  print STDERR "Line $l: Warning: duplicate IP entry $ip, the last one
+ will be used\n";
  }
  2. or download this
     
127.0.0.1 192.168.0.1
  3. or download this
        unless (defined $content) {
        open my($fh), "<", "/etc/hosts"
...
        local $/;
        $content = <$fh>;
    }