To avoid duplicates, you can sidestep the symlink issue (because any given file might also be a symlink) by stat'ing everything you process and rejecting anything where the dev/inode pair is the same. In other words: 
BEGIN {
  my %seen;
  sub process {
    my $entry = shift;
    my ($dev, $ino) = stat $entry or return;
    $seen{"$dev $ino"}++ or return;
    ... rest of processing ...
  }
}

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-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

In reply to Re: Detecting if a folder is a symbolic link by merlyn
in thread Detecting if a folder is a symbolic link by ralphch

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