I'm assuming that n is drwxrwxrwx's way of meaning any integer. If you do a

use Tk::Pretty;
@config = $entryvar->configure;
print Pretty @config;
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what results do you get for width and height? Try to use specific, unique examples for us like

$entryvar=$main->Entry(-text => "var")->grid(-column => 10, -row => 5)
+;
$entryvar->configure(-width => 30, -height => 20);
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- - arden.