was ist der unerschied ?
hier mal das test-script:
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#!/usr/bin/perl -w
use strict;
use Tk;
&hauptfenster();
sub hauptfenster
{
my $hauptfenster=new MainWindow(-title=>"Manuelles fahren", -width=>"640", -height=>"480");
my $text1=$hauptfenster->Label(-text=>"Drücken Sie auf die Tasten um die Mschine zu bewegen", -relief=>"groove");
$text1->place(-x=>"20", -y=>"20", -width=>"600", -height=>"50");
my $button1=$hauptfenster->Button(-text=>"hoch", -command=>sub{&fahr("oben")});
$button1->place(-x=>"270", -y=>"100", -width=>"100", -height=>"100");
my $button2=$hauptfenster->Button(-text=>"links", -command=>sub{&fahr("links")});
$button2->place(-x=>"170", -y=>"200", -width=>"100", -height=>"100");
my $button3=$hauptfenster->Button(-text=>"rechts", -command=>sub{&fahr("rechts")});
$button3->place(-x=>"370", -y=>"200", -width=>"100", -height=>"100");
my $button4=$hauptfenster->Button(-text=>"runter", -command=>sub{&fahr("unten")});
$button4->place(-x=>"270", -y=>"300", -width=>"100", -height=>"100");
MainLoop;
}