With almost all Tk widgets, we have the function get which will return the value of the widget. Now you are entering name to the "Tk::Entry" widget you have ( $vu_enl ). So $vu_enl->get() will give you the actual value entered.

I am including the fixed code here :)

use Tk;  
use strict;
      
my $mw = MainWindow->new;  
$mw->configure(-title => 'Verify User',-background =>'blue');  
$mw->geometry('+100+300');  
my $vu_frml = $mw->Frame( -relief      => 'groove',   
                          -borderwidth => 3, 
                          -background  =>'blue', 
                        ) ->pack(-side => 'top', -fill => 'x');
                            
my $vu_lb1  = $vu_frml->Label(
                               -text =>'name',   
                               -background=>'blue',
                               -foreground=>'white',   
                              )->pack( -side=>'left' );  
                               
my $vu_enl  = $vu_frml->Entry(
                               -width =>9,   
                               -background =>'white' 
                              )->pack( -side=>'left',-pady=>3 );      
+      
$mw->Button((
    -background=>'blue',
    -foreground=>'white', 
    -text => 'ok', 
    -command =>sub { 
                        $mw -> Label(
                                       '-text' => "hello ".$vu_enl->ge
+t(), #### Where I changed 
                                       '-font' => "fixed",
                                       )->pack; 
                   },
  ))->pack(-side =>'top', -fill => 'x');  
MainLoop;
[download]

Almost all documentation you may need (regarding Perl/Tk) is available here.

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Updates:
Formated code to look better.

Cheers !

--VC

---

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