sub cmd {
.
.
.
    ## Determine if we should remove the first line of output based
    ## on the assumption that it's an echoed back command.
    if ($cmd_remove_mode eq "auto") {
        ## See if remote side told us they'd echo.
        $telopt_echo = $self->option_state(&TELOPT_ECHO);
        $remove_echo = $telopt_echo->{remote_enabled};
    }
    else {  # user explicitly told us how many lines to remove.
        $remove_echo = $cmd_remove_mode;
    }

    ## Get rid of possible echo back command.
    while ($remove_echo--) {
        shift @$output;
    }
.
.
.