use Getopt::Long;
my (@foos, @bars, @bazen, @quuxi);
sub setter {
   no strict refs;
   push @{shift}, split /,/, @_;
}
GetOptions (
    'foos=s'  => \setter,
    'bars=s'  => \setter,
    'bazen=s' => \setter,
    'quuxi=s' => \setter,
);