usage(void)
static void usage(void)
usage(void){  fprintf(stderr, _("Usage: arp [-vn] [-H type] [-i if] -a [hostname]\n"));  fprintf(stderr, _("       arp [-v] [-i if] -d hostname [pub][nopub]\n"));  fprintf(stderr, _("       arp [-v] [-H type] [-i if] -s  hostname hw_addr [temp][nopub]\n"));  fprintf(stderr, _("       arp [-v] [-H type] [-i if] -s  hostname hw_addr [netmask nm] pub\n"));  fprintf(stderr, _("       arp [-v] [-H type] [-i if] -Ds hostname if [netmask nm] pub\n"));  fprintf(stderr, _("       arp [-vnD] [-H type] [-i if] -f filename\n"));  exit(-1);}