The line perl scriptname.pl >outfile redirects STDOUT to the file. Anything written to STDERR is written to the screen.

The standard file handles are numbered in windows as they are in UNIX. STDIN=0, STDOUT=1, STDERR=2. Try tying together STDOUT and STDERR on the command line as part of the redirection to a file. the following code illustrates the point.

#! /usr/bin/perl -w
#
use strict;
use warnings;

print "Standard Out\n";
print STDERR "Standard Error\n";
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Run using the command line:

myScript.pl >out.txt 2>&1
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If you are working with Windows but you need to use a Unix tool then most of them have been ported. Try Unix Utils from SourceForge http://unxutils.sourceforge.net/. The tee command is available for you to use.