nc missing option -z

[James Hogarth]

> And you still get "Host is up" but, of course, the service you want
> isn't....
>
>
> Err read the man page? -Pn assumes the host is up (skips the initial ping
in case something drops that when you are interested in a port) so it will
say the host is up in that  case - but we don't care about the host being
up... we want the service so you need to parse the service output.
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