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    my $appendCmd  = "iptablesAdm append";
    $appendCmd    .= " --type=rule";
...
    $appendCmd    .= " --protocol=${protocol}"; 
    $appendCmd    .= " --domain=${domain}"; 
    $appendCmd    .= " --persist=yes";

    my $appendCmd  = "iptablesAdm append"
                   . " --type=rule"
...
                   . " --protocol=${protocol}" 
                   . " --domain=${domain}"
                   . " --persist=yes";