You need either <br> or <pre> tags, as notice above. Also, you'll want to html-escape the lines, because otherwise 
     Input that </pre>looks <like> this &amp;this

[download]
Will look quite different from what you'd expect.

Use 

print $query->escapeHTML($line),"<br>";

[download]
or something similar.

updated: fixed typos

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: cgi print file to screen by Joost
in thread cgi print file to screen by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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