#!/usr/bin/perl
# tktail pathname
use warnings;
use strict;
use Tk;

#usage tktail z.log

my $pid = open(H, "tail -f -n 25 $ARGV[0]|") or die ;

my $mw = MainWindow->new;

$mw->fontCreate('big',
   -family=>'courier',
  -weight=>'bold',
  -size=>int(-24*24/14));

my $t = $mw->Text(-width => 80, -height => 25, 
                  -wrap => 'none',
                  -bg => 'lightyellow',
                  -font => 'big')->pack(-expand => 1);

$mw->fileevent('H', 'readable', [\&fill_text_widget, $t]);
$mw->OnDestroy(\&quitCB);
MainLoop;

sub fill_text_widget {
my($widget) = @_;
my $text = <H>;
$widget->insert('end', $text);
$widget->yview('end');
} # end fill_text_widget


sub quitCB {
kill 9,$pid or die $!;
exit;
}