Here's how I'd do it.
#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11117902
use warnings;
use Tk;
use Tk::IO;
my $date = localtime();
my $mw = MainWindow->new;
$mw->Button(-text => 'Start', -command => \&start,
)->pack(-side => 'top', -fill => 'x');
$mw->Label(-textvariable => \$date, -fg => 'blue',
)->pack(-side => 'top', -fill => 'x');
$mw->Button(-text => 'Exit', -command => sub {$mw->destroy},
)->pack(-side => 'bottom', -fill => 'x');
$_ = $mw->Text(-width => 10, -font => 14,
)->pack(-side => 'left') for my( $one, $two );
$mw->repeat( 1000, sub { $date = localtime() } );
MainLoop;
sub start
{
Tk::IO->new(-linecommand => sub {
$one->insert(end => shift);
$one->see('end');},
)->exec('for i in `seq 1 24` ; do sleep .5 ; echo $i ; done');
Tk::IO->new(-linecommand => sub {
$two->insert(end => shift);
$two->see('end');},
)->exec('for i in `seq 1 24` ; do sleep .7 ; echo $i ; done');
}
Note that the date keeps advancing while the text widgets are being filled in, indicating that the gui is still responding.
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