At times, you are just too tired of typing nc -l...here is the script
to be used by other programs
This script, port_listen.sh, returns 1 if the listen_app does
not exit after a timeout; otherwise, it returns 0. It relies on the
behavior of nc/netcat, which exits once it receives a message. I think,
I saw...who knows?
On a host machine mickey
$ TIMEOUT=60 PORT_NUMBER=4242 ./port_listen.sh
On a host machine minnie
$ echo "Pluto is comming" | nc -q0 mickey 4242
The counterpart of this is port_establish.
author: tuan t. pham