I googled and found this:
The ProgressBar Widget:
#!/usr/bin/perl
use strict;
use warnings;
use Tk;
use Tk::ProgressBar;
my $percent_done;
my $mw = MainWindow->new( -title => 'ProgressBar example' );
my $progress = $mw->ProgressBar(
-width => 30,
-from => 0,
-to => 100,
-blocks => 50,
-colors => [ 0, 'green', 50, 'yellow', 80, 'red' ],
-variable => \$percent_done
)->pack( -fill => 'x' );
$mw->Button(
-text => 'Go!',
-command => sub {
for ( my $i = 0 ; $i < 1000 ; $i++ ) {
$percent_done = $i / 10;
print "$i\n";
$mw->update } } )->pack(-side => 'bottom');
MainLoop;
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