Maybe Tk::after can help you.
Update: Example code: 
#!/usr/bin/perl
use warnings;
use strict;

use Tk;

my $mw       = new MainWindow::;
my $frm_name = $mw->Frame();
my $lab      = $frm_name->Label(-text => 'IP:');
my $ent      = $frm_name->Entry();
my ($txt, $but);
$but         = $mw->Button(-text => 'Start Ping',
                           -command => sub { push_button($but, $txt, $
+ent) });
my $textarea = $mw->Frame();
$txt         = $textarea->Text(-width => 40, -height => 10);
my $srl_y    = $textarea->Scrollbar(-orient=>'v', -command => [yview =
+> $txt]);
my $srl_x    = $textarea->Scrollbar(-orient=>'h', -command => [xview =
+> $txt]);
$txt->configure(-yscrollcommand => ['set', $srl_y],
                -xscrollcommand => ['set', $srl_x]);
$lab->grid(-row => 1, -column => 1);
$ent->grid(-row => 1, -column => 2);
$frm_name->grid(-row        => 1,
                -column     => 1,
                -columnspan => 2);
$but->grid(-row        => 4,
           -column     => 1,
           -columnspan => 2);
$txt->grid(-row => 1, -column => 1);
$srl_y->grid(-row    => 1,
             -column => 2,
             -sticky => 'ns');
$srl_x->grid(-row    => 2,
             -column => 1,
             -sticky => 'ew');
$textarea->grid(-row        => 5,
                -column     => 1,
                -columnspan => 2);
MainLoop();


sub push_button {
    my ($but, $txt, $eng) = @_;
    open my $PING, '-|', 'ping', $eng->get or die;
    $but->configure(-state => 'disabled');
    $txt->repeat(1000, sub {$txt->insert('end', scalar <$PING>)});
}

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: How the Perl/TK scroll box like MSDOS rolling display data? by choroba
in thread How the Perl/TK scroll box like MSDOS rolling display data? by perllee

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.