#!/usr/bin/perl
use IO::File;
use IO::Select;
use Tk;
my $FILE=IO::File->new("/tmp/testfile") or die;
my $SEL=IO::Select->new();
$SEL->add($FILE);
my $mw=Tk::MainWindow->new();
my $list=$mw->Listbox->pack();
my $entry=$mw->Entry->pack();
$list->repeat(500, sub {
    if ($SEL->can_read(0)) {
         while(<$FILE>) {
             chomp;
             $list->insert(end,$_);
             $list->see(($list->size)-1);
         }
         seek(FILE,0,1);
    }
});
MainLoop;