netcat or nc is a handy network swiss army knife.

It can even be used to copy a file from one host to another over the network.

This is how you do it:

On the server, run:

nc -l -p 8080 > somefile.txt

On the client, run:

cat somefile.txt | nc 10.0.0.1 8080

This will copy somefile.txt from the client to the server on 10.0.0.1 using port 8080