If you are running it as a cgi script then you must print some http headers before you print the content. For this use CGI.pm

eg:

use CGI;

my $q = new CGI;
print   $q->header,                    # create the HTTP header
        $q->start_html('Whatever'), # start the HTML

open(FILE, "data.txt");   
  while(<FILE>){         
     chomp;
     print "Saw $_ in data.txt<br>\n"; 
  }
  close FILE;  

print $q->end_html;

[download]
You could really do with finding out the error_log file for your web server and seeing what it prints out about your script.
Apache by default has an env.cgi in the cgi-bin directory. Try http://server.name.com/cgi-bin/env.cgi and have a look for the server root directory there.

If you dont have CGI.pm then try this. I'm not sure if it will work but it should 


print "Content-type: text/html\n\n";
print "<HTML><HEAD><TITLE>STUFF</TITLE>";
print "</HEAD><BODY>"
open(FILE, "data.txt");        
  while(<FILE>){         
     chomp;
     print "Saw $_ in data.txt<br>\n"; 
  }
close FILE;    
  print "</BODY></HTML>";

[download]

-Diarmuid

In reply to Re: file input problem by diarmuid
in thread file input problem by Anonymous Monk

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.