#!/usr/local/bin/perl -w
use Tk;
require Tk::IO;
my $top = MainWindow->new;
my $status = "Ready for job ...";
$top->Label(-textvariable => \$status, -anchor => 'w')->pack(-side => 'bottom', -fill => 'x', -anchor => 'w');
my $t = $top->Text("-relief" => "raised", "-bd" => "2", "-setgrid" => "true");
my $s = $top->Scrollbar("-command" => ["yview",$t]);
$t->configure("-yscrollcommand" => ["set",$s] );
$fh  = Tk::IO->new(-linecommand  => [$t,'insert','end'],
                   -childcommand => \&Child);
$cmd = 'ls -l';
$e = $top->Entry("-width" => 40,"-textvariable" => \$cmd);
$e->pack("-side" => "bottom");
$b = $top->Button("-text" => "Do It", "-command" => [\&DoIt,$fh,$e]);
$b->pack("-side" => "bottom");
$b = $top->Button("-text" => "Quit", "-command" => ['destroy',$top]);
$b->pack("-side" => "bottom");
$b = $top->Button("-text" => "Kill", "-command" => sub { $fh->killpg(3)} );
$b->pack("-side" => "bottom");
$s->pack("-side"=>"left","-fill" => "y");
$t->pack("-side"=>"left","-expand" => "y", "-fill"   => "both");
$t->bind("<Any-Enter>", sub { $t->focus });
$e->update;
$e->focus;
Tk::MainLoop;
sub Child
{
 my ($code,$fh) = @_;
 my $cmd = join(' ',$fh->command);
 $status = "code=$code from $cmd";
}
sub DoIt
{my $fh = shift;
 my $e = shift;
 $fh->exec($e->get);
}