One trick you can also use (in addition to simply doing a redirect) is to take advantage of the multipart/x-mixed-replace MIME type, which is only supported by Netscape. If you're familiar with multipart MIME types, this is essentially identical, except each "part" will replace the previous part in the browser window. This is useful for things like JPEG image streaming. Sadly, IE has never chosen to adopt this functionality. 
$|=1;

print <<"EoF";
Content-type: multipart/x-mixed-replace; boundary=1234

--1234
Content-type: text/html

<h1>Test 123...</h1>

--1234
EoF

sleep 2;

print <<"EoF";
Content-type: text/html

<h1>Test 456...</h1>

--1234
EoF

[download]

In reply to Re: How do I print overwriting existing output? by Fastolfe
in thread How do I print overwriting existing output? by Nimster

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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! —
  • 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:
    & &amp;
    < &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.