print_plural
print_plural(", ", n, "byte");
print_plural("\tinput: ", ifi->ifi_ipackets, "packet");
print_plural(", ", ifi->ifi_imcasts, "multicast");
print_plural(", ", ifi->ifi_ierrors, "error");
print_plural(", ", ifi->ifi_iqdrops, "queue drop");
print_plural("\n\toutput: ", ifi->ifi_opackets, "packet");
print_plural(", ", ifi->ifi_omcasts, "multicast");
print_plural(", ", ifi->ifi_oerrors, "error");
print_plural(", ", ifi->ifi_collisions, "collision");