This question comes from MrMasters who asked if there was a way to send messages between Raspberry Pis on the same network.
So I did a little Googling and found this little nugget on the Ask Ubuntu forums.
How can I send and receive a message?
To send a message to a remote computer, first the two need to connect up.
Setup the receiver
On one computer (receiver) I type in the Terminal
nc -l 55555
ncto wait for an incoming connection. And
55555is the port to which the two machines connect and talk via. You can change the port number, but the sender and receiver must be on the same port.
Setup the sender
On a second computer (sender) type in the Terminal
nc IP ADDRESS OF FIRST MACHINE 55555
So for my demo the receiver machine has an IP address of 192.168.0.7
On the sender computer start typing your message!
Bit of fun
For fun (yeah I know) I piped the output of
dmesg running on the sender machine to the nc command, so the receiver machine saw all the output from that command. Cool and could be handy for something!
dmesg | nc 192.168.0.7 55555