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$data .= $self->cmd('some other command', undef, $output_ref);

$data .= $self->cmd('command | grep string | last 3', undef, $output_r
+ef);

$data .= $self->cmd('runthis', undef, $output_ref);

sub smart_cmd {
  my($self,$cmd,@args) = @_;

...

  $data = $host->cmd($cmd);
  ($data,$matched_prompt) = $host->cmd($cmd,$prompt);