I would use a hash to store each visited link and use the exists function before visiting a link. The main issues would be:

• You probably want to ensure that you have absolute links (not relative ones), in the hash.
• Ensure that any links that point to scripts have the query string stripped. Rough guess as to the best way to do that:

  $link =~ s/\?.*$//;
  $visited{ $link } = '';
  [download]

Without knowing how you're getting into the infinite loop, I can only offer one other suggestion: for the %visited hash, you may have a problem if a redirection occurs as you'll resolve to the wrong URL. If that's likely to be an issue, you'll have to use LWP::UserAgent and examine the response code.

Cheers,
Ovid

Join the Perlmonks Setiathome Group or just click on the the link and check out our stats.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.