Shell Programming and Scripting

netcat seems to be disabled for me. I actually want to run something on many machines simultaneously and then create a tcp port into which all machines will write the results into .. into one common location. How can I do this?

Regards,
garric

The Perl examples should work as well; just replace whatever port number they use (daytime in the example we discussed before) with a random port number which is larger than 1023, such as port 4343, as in the Netcat examples above. (Opening ports below 1024 for listening usually requires root privileges.)

I got the simple netcat example to work on the same machine. But when i try running it through a script ( Perl ) with a port higher than that 1024 ,
it just 'dies' with the error.

(Eg :
$remote = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "locahost",
PeerPort => "4343"
) or die "cannot connect to port 4343 at localhost";

Add $! to the error message to find out why it's dying. Also check your spelling of "localhost".

Connection refused it is. Though I am running it as root

--- cannot connect to port 4343 at localhost : Connection refused at /tmp/test.pl line 3---

Hmm, looks like you just get "Invalid argument" in $! if you use a host name which doesn't exist, so that doesn't help much. Still, a good habit to always include $! in suicide notes.

Connection refused means you forgot to start the listener on port 4343. You can't connect if nobody has opened the port for listening. Just run nc -l -p 4343 on there for now. Once you have the client working, you can work on replacing the server with something more to your liking.

Thanks .. I got this to work, finally. But this requires me to be there for the input. How do i re-direct the output of a script into a port?

Also, how does the port handle multiple requests coming in at the same time?

Thanks for your help.
Regards,
garric