I need a solution which prints STDOUT and STDERR both to the screen and to a file at the same time.
So, here is one solution. Maybe it is too complicated, but your question smells like logging anyhow. 

use strict;
use Log::Log4perl qw(get_logger);

# Define configuration for file test.log, STDERR, and STDOUT
my $conf = q(
        log4perl.logger                         = ALL, FileApp, Screen
+STDERR, ScreenSTDOUT

        log4perl.appender.FileApp               = Log::Log4perl::Appen
+der::File
        log4perl.appender.FileApp.filename      = test.log
        log4perl.appender.FileApp.layout        = PatternLayout
        log4perl.appender.FileApp.layout.ConversionPattern = %m%n

        log4perl.appender.ScreenSTDERR          = Log::Log4perl::Appen
+der::Screen
        log4perl.appender.ScreenSTDERR.stderr   = 1
        log4perl.appender.ScreenSTDERR.layout   = PatternLayout
        log4perl.appender.FcreenSTDERR.layout.ConversionPattern = %m%n

        log4perl.appender.ScreenSTDOUT          = Log::Log4perl::Appen
+der::Screen
        log4perl.appender.ScreenSTDOUT.stderr   = 0
        log4perl.appender.ScreenSTDOUT.layout   = PatternLayout
        log4perl.appender.ScreenSTDOUT.layout.ConversionPattern = %m%n
);

# Initialize logging behaviour
Log::Log4perl->init( \$conf );

# Obtain a logger instance
my $logger = get_logger("Chess::GUI");
$logger->info("This is going to test.log, STDERR, and STDOUT.");

[download]

Log::Log4perl is quite powerful. You could try experimenting with different conversion patterns as explained in Log::Log4perl::Layout::PatternLayout.

In reply to Re: Both print and redirect STDOUT and STDERR by Perlbotics
in thread Both print and redirect STDOUT and STDERR by chessgui

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