use Getopt::Long;
my (@foos, @bars, @bazen, @quuxi);
GetOptions (
    'foos=s'  => sub { shift; push @foos, split /,/, @_; },
    'bars=s'  => sub { shift; push @bars, split /,/, @_; },
    'bazen=s' => sub { shift; push @bazen, split /,/, @_; },
    'quuxi=s' => sub { shift; push @quuxi, split /,/, @_; },
);