How to send only one UDP packet with netcat?

Question

I want to send only one short value in a UDP packet, but running the command

echo -n \"hello\" | nc -4u localhost 8000

I can see that the serve

Answer 1

On a current netcat (v0.7.1) you have a -c switch:

-c, --close                close connection on EOF from stdin

Hence,

echo "hi" | nc -cu localhost 8000

should do the trick.