Play with this. Example usage at the __END__. You'll need a separate Thread::Queue for each thread.

#! perl -slw
use strict;
use threads;
use Thread::Queue;
use IO::Pipe;

sub runNGather {
    my( $Q, $cmd ) = @_;
    my $pipe = IO::Pipe->new();
    $pipe->reader( "$cmd 2>&1" );
    $Q->enqueue( $_ ) while <$pipe>;
    $Q->enqueue( undef );
    return;
}

my $Q = new Thread::Queue;

threads->create( \&runNGather, $Q, $ARGV[0] )->detach;

require Tk;
require Tk::ROText;

my $top = MainWindow->new; #$mw-> Toplevel();
my $label = $top -> Label(
    -text=>"STDOUT from script", -relief=>"groove"
)->pack();

my $ro = $top->Scrolled(
    'ROText', -width => 60, -height=>20, -scrollbars=>"e"
)->pack();

# continuously display output
while( $_ = $Q->dequeue ) {
    $ro->insert("end", "$_");
    $ro->update();
    sleep 1;
}

# add close button
my $close = $top->Button(
    -text=>"Close window",
    -command=>sub { destroy $top; }
)->pack();

__END__
P:\test>522177 "ping www.perlmonks.org"
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