diff --git a/recv_file.lua b/recv_file
similarity index 53%
rename from recv_file.lua
rename to recv_file
index 20b1115..6635372 100644
--- a/recv_file.lua
+++ b/recv_file
@@ -1,22 +1,18 @@
-local sides = peripheral.getNames()
-for i = 1, #sides do
-    if peripheral.getType(sides[i]) == "modem" then
-        modemSide = sides[i]
-        break
-    end
-end
+dofile("utils")
+modemSide = utils.getSideOf("modem") --get side the modem is on
 
 rednet.open(modemSide)
 
+--get message, no timeout
 id, msg, dist = rednet.receive()
-print("Received data:")
-term.write("Filename: ")
-name = tostring(read())
 
-print(msg)
+print("Received data:")
+term.write("Output filename: ")
+name = tostring(read())
+--decompress string
 content = textutils.unserialize(msg)
+--write to file
 local file = fs.open(name, "w")
 file.write(content)
 file.close()
-
 rednet.close(modemSide)
diff --git a/send_file.lua b/send_file
similarity index 69%
rename from send_file.lua
rename to send_file
index 422a841..789f6ce 100644
--- a/send_file.lua
+++ b/send_file
@@ -1,10 +1,5 @@
-local sides = peripheral.getNames()
-for i = 1, #sides do
-    if peripheral.getType(sides[i]) == "modem" then
-        modemSide = sides[i]
-        break
-    end
-end
+dofile("utils")
+modemSide = utils.getSideOf("modem")
 
 rednet.open(modemSide)
 
@@ -30,4 +25,4 @@ else
     print("Aborted.")
 end
 
-rednet.close(modemSide)
\ No newline at end of file
+rednet.close(modemSide)
diff --git a/utils b/utils
new file mode 100644
index 0000000..b5dabba
--- /dev/null
+++ b/utils
@@ -0,0 +1,15 @@
+--lua module "utils" for random utilities
+if utils then return end --avoid loading twice
+utils = {}
+
+function utils.getSideOf(name) --get which side, if any, a peripheral p is connected to
+	local sides = peripheral.getNames()
+	for i = 1, #sides do
+	    if peripheral.getType(sides[i]) == name then
+			--found it!
+	        return sides[i]
+	    end
+	end
+end
+
+return utils