...
if(! GetOptions ('plugin=s' => \$plugin,'config=s' => \$instanceName,'debug' => \$debug, 'interface=s' => \$interface, 'mcastAddress=s' => \$mcastAddress, 'mcastPort=s' => \$mcastPort, 'file=s' => \$snoopf, 'remotePcapForwarder=s' => \$remotePCF, 'netprobe=s' => \$netprobe))
{
    usage();
    xit("incorrect options specification", 99);
}

if($debug)
{
    msg("info : turning on debug");
    $ENV{TRACE}=1;
    $DEBUG=1;
}

if(! $plugin)
{
    usage();
    xit("you must supply a plugin name", 98);
}

msg("info : plugin \"$plugin\" will be connected");
eval (require "$PALIBDIR/$plugin.pm");