View difference between Paste ID: TQ8E9W5f and sfpBAcfe

 -- ##############################
--- msg_sender test1
+-- msg_sender test2
 -- http://hevohevo.hatenablog.com/
 
 rednet.open("right")
 
-local message = args[1]
+
-local receiver_id = tonumber(args[2])
+assert(args and #args>0, "msg_sender <receiver_id>")
 local receiver_id = tonumber(args[1])
-rednet.send(receiver_id, message)
+
 local trans_tbl = {
   w="turtle.forward()",
   a="turtle.turnLeft() turtle.forward() turtle.turnRight()",
   s="turtle.back()",
   d="turtle.turnRight() turtle.forward() turtle.turnLeft()",
   space="turtle.up()",
   leftShift="turtle.down()",
   right="turtle.turnRight()",
   left="turtle.turnLeft()"
 }
 
 print("Press CTRL+T to terminate")
 while true do
   local event, scancode = os.pullEvent("key")
   local keyname = keys.getName(scancode)
   local message = trans_tbl[keyname]
   print(keyname," => ",message or "none")
 
   if message then
     rednet.send(receiver_id, message)
   end
 end