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  1. or download this
    my $var = 'LR20SR37PD30LR23CR23BT01H';
$var .= ' ' x 40 - length($var);
  2. or download this
    my $var = 'LR20SR37PD30LR23CR23BT01H';
$var = substr($var . ' ' x 40, 0, 40);
  3. or download this
    my $var = 'LR20SR37PD30LR23CR23BT01H';
$var = sprintf '%-40s', $var;