usage()
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: ktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [cnisuv]",
"usage: ktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t trstr]",
" ktrace [-aCcid] [-f trfile] [-t [cnisuw] command");
" ktrace [-adi] [-f trfile] [-t trstr] command");
exit(1);
}