Debug::STDERR - provide debug() method and redirect STDERR.

  use strict;
  use warnings;

  # set environment variables, or set and export it for your shell

  BEGIN {
    $ENV{DEBUG} = 1;
    $ENV{STDERR2LOG} = "log.out";
  }

  use Debug::STDERR;

  debug( "foo" => { bar => "baz" });

Debug::STDERR provides debug() method and redirect STDERR out to a file.

If you want to use it, you should set tow environment variables for your shell.

   $ export DEBUG=1
   $ export STDERR2LOG=log.out

or edit $ENV on BEGIN block. ( you must put it on before the line 'use Debug::STDERR;' )

If you set only 'DEBUG' variable, the debug messages out to STDERR. Furthermore if you set 'STDERR2LOG' variable, the data for STDERR will be redirect to log file.

    # sample code   

    use strict;
    use warnings;
    use LWP::UserAgent;
    BEGIN {
        $ENV{DEBUG} = 1;
    }
    use Debug::STDERR;
    my $ua = LWP::UserAgent->new;
    debug( my_debug => { ua => $ua } );

   # output sample
    ------------------------------------------------------------------------------------------------------------------------
    2009-05-21 15:12:07 511529        FROM    : main of test.pl line 9 
      MESSAGE : my_debug
      DUMPER  :
        $VAR1 = {
              'ua' => bless( {
                               'max_redirect' => 7,
                               'protocols_forbidden' => undef,
                               'show_progress' => undef,
                               'handlers' => {
                                               'response_header' => bless( [
                                                                             {
                                                                               'owner' => 'LWP::UserAgent::parse_head',
                                                                               'callback' => sub { "DUMMY" },
                                                                               'm_media_type' => 'html',
                                                                               'line' => '/usr/local/lib/perl5/site_perl/5.10.0/LWP/UserAgent.pm:608'
                                                                             }
                                                                           ], 'HTTP::Config' )
                                             },
                               'no_proxy' => [],
                               'protocols_allowed' => undef,
                               'use_eval' => 1,
                               'requests_redirectable' => [
                                                            'GET',
                                                            'HEAD'
                                                          ],
                               'timeout' => 180,
                               'def_headers' => bless( {
                                                         'user-agent' => 'libwww-perl/5.826'
                                                       }, 'HTTP::Headers' ),
                               'proxy' => {},
                               'max_size' => undef
                             }, 'LWP::UserAgent' )
            };

takeshi miki <miki@cpan.org>

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.