RNFTP

local args = {...}
local function usage()
 print("=== SENDING ===")
 print("Usage: rnftp send SIDE FILENAME")
 print("=== RECEIVING ===")
 print("Usage: rnftp receive SIDE FILENAME")
end
if #args ~= 3 then return usage() end
local side = args[2]
local filename = args[3]
rednet.open(side)
if args[1] == "send" then
 local f = fs.open(filename, "r")
 local data = f.readAll()
 print("Sending file")
 f.close()
 rednet.broadcast(data)
 local done = false
 while not done do
  local sender, message = rednet.receive()
  if message == "confirm" then done = true end
 end
elseif args[1] == "receive" then
 print("Receiving file")
 local sender, message = rednet.receive()
 rednet.send(sender, "confirm", true)
 local f = fs.open(filename, "w")
 f.write(message)
 f.close()
 print("Received file")
else
 usage()
end