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  1. or download this
    my $data = $self->cmd('show run', undef, $output_ref, qr/^(?![:!])/);
$data .= 'appended data';
# Equivalent to
$data = $data . 'appended data';
  2. or download this
    my $data = $self->cmd('show run', undef, $output_ref, qr/^(?![:!])/);
$data .= $self->cmd('some other command', undef, $output_ref, qr/^(?![
+:!])/);
  3. or download this
    use strict;
use warnings;
...
print something;
# 345