Netcat – Troubleshooting No Response Issue

netcatpipe

I'm trying to send commands to a tcp port using netcat and pipe response
when I run netcat and type my command it prints response correctly but when I pass command from a pipe it sends the command correctly but doesn't print response

So, this works correctly: 

netcat  localhost 9009

while this just sends command but doesn't print response: 

echo 'my_command' | netcat  localhost 9009

why?
How can I make netcat to print response text ?

Best Answer

As @Patrick said, this problem is usually due to netcat exiting before the response has been given. You remedy that by adding -q 2 to the command line, i.e., tell netcat to hang around 2 seconds after detecting EOF on standard input. Obviously you can make it wait some other number of seconds as well.

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