- print STDERR "Usage: kill_known_host <IP>\n";
- print STDERR "Usage: kill_known_host <hostname>\n";
+ print STDERR "Usage: kill_known_host [options] <IP>|<hostname>\n";
+ print STDERR "Options: -n Only report key; don't delete it.\n";
+ print STDERR " -p Allow partial match.\n";
+ print STDERR "Example: kill_known_host -p www\n";
+ print STDERR " Remove all keys with hostname beginning www.\n";