Re: ncat 5.10BETA handling of -l -p is not compatible with nc-1.10

[David Fifield <david () bamsoftware com>]

On Fri, Jan 08, 2010 at 05:32:00PM +0100, Denys Vlasenko wrote:
> Every reimplementation of netcat seems to try to break
> this syntax:
>
> nc -l -p 123    # listen on local port 123
>
> GNU nc, openbsd's nc all have it broken. And ncat is no exception.
> "You too, Brutus". IIRC they even break it in different ways -
> they have different ways to specify local port: as a parameter
> to -l option, as a standalone port parameter etc... AARRGGHH...

Yeah, it's a mess. It's impossible to be compatible with everybody. In
this case there's an easy solution. If you run the above command, Ncat
says:

Ncat: -l and -p are incompatible.  Specify the address and port to bind to like you would a host to connect to. 
QUITTING.

Since the program obviously knows what you want, it should just do it
instead of telling you to change your command.

David Fifield
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