#!/usr/local/bin/new/perl -w
use strict;
my $FILE_LOG = (@ARGV) ? shift : 'README';

use Tk;

my $top = MainWindow->new;
my $t   = $top->Scrolled('Text')->pack(-expand => 1, -fill => 'both');
my $b   = $top->Button(-text => 'Quit', -command => [destroy => $top])->pack;
init_check();
MainLoop;

sub init_check
{
# my $cmd = "/usr/bin/tail +0f $FILE_LOG";
  my $cmd = "ls -l ";


 my $open_pid = open (TAIL, "$cmd|") || die "Can't open $cmd: $!";

 select (TAIL); $| = 1;
 select (STDOUT); $| = 1;

 $top->fileevent(\*TAIL, 'readable',
         sub {
              my $line = <TAIL>;
              if (defined $line)
               {
                $t->insert('end',$line);
                $top->idletasks;
               }
              else
               {
                close(TAIL);
               }
         });
}