What needs to be changed, so the listbox gets filled "live"?

You could add an $lb2->update() in the long running while loop 

   while (<PIPE>) {
      chop ($_) ;

      $lb2 -> insert('end',$_);
      $lb2->update();              # <---
   }

[download]

In reply to Re: perl/Tk: How to "release" a button immediately after it's pushed? by almut
in thread perl/Tk: How to "release" a button immediately after it's pushed? by unknown-monk

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