This is what I use: 

BEGIN {
  require 5.004;
  use CGI::Carp qw(fatalsToBrowser carpout);
  my $logfile = 'path/to/logfile';
  open LOG, ">>$logfile" or
    die "Couldn't append to $logfile: $!\n";
  carpout(\*LOG);
};

[download]
This appends to the logfile all the output sent to STDERR, both during compile-time and during run-time. E.g., if I have the line 
warn "Logging...\n";

[download]
in my code, this will send the following to the logfile: 
[Thu Apr  7 05:39:57 2005] testcgi: Logging...

[download]

the lowliest monk

In reply to Re: How to create an error log file? by tlm
in thread How to create an error log file? by tsam

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.