Send a binary file (line by line) to a socket server with Netcat

Question

As a spin off to this Stack Overflow question I want to archieve the same except for a couple of tweaks.

I want to connect to a host, send a binary file, line by lin

Answer 1

You can achieve it in two steps:

1) You need to start nc with a named pipe (fifo) as its input:

mkfifo /tmp/fifoIn; cat /tmp/fifoIn | nc localhost 2222 &

2) Send your data from file input.txt, line by line with 2 sec delay:

cat input.txt | while read line; do echo $line; sleep 2; done > /tmp/fifoIn

I've tested it with this "server" (I'm using openbsd netcat syntax):

nc -l localhost 2222