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Programming Perl, Second Edition, Wall, Larry, Tom Christiansen & Randal L. Schwartz, O'Reilly & Associates, Inc. September 1996.
The Perl 5 debugger man page, http://www.perl.org/CPAN/doc/manual/html/pod/perldebug.html.
All listings referred to in this article are available by anonymous download in the file ftp://ftp.ssc.com/lj/listings/issue49/2484.tgz. Also included in the tgz file is a CGI program for you to debug.