diff --git a/main.py b/main.py
index 8adbb8f..4f96bbc 100644
--- a/main.py
+++ b/main.py
@@ -1,23 +1,36 @@
 #!/usr/bin/python3
 import csv
 import os
+from datetime import datetime
 
 path = '/srv/tftp/'
 
 header_cfg = """#!version:1.0.0.1
 #Tasti rapidi del tastierino esterno
+#ATTENZIONE: NON MODIFICARE QUESTO FILE
+#Questo file viene generato automaticamente a partire dal file
+#tastierino_esterno.csv, modificare quest'ultimo ed attendere qualche minuto
 
 account.1.sip_server.1.address = 192.168.1.7"""
 
+
+def append_log(text):
+    with open("error.txt", "a") as f:
+        now = datetime.now()
+        now_formatted = now.strftime("%d/%m/%Y, %H:%M:%S")
+        log = " ".join([now_formatted, text])
+        f.write(log)
+
+
 try:
     os.chdir(path)
-    print("Current working directory: {0}".format(os.getcwd()))
+    append_log("Current working directory: {0}".format(os.getcwd()))
 except FileNotFoundError:
-    print("Directory: {0} does not exist".format(path))
+    append_log("Directory: {0} does not exist".format(path))
 except NotADirectoryError:
-    print("{0} is not a directory".format(path))
+    append_log("{0} is not a directory".format(path))
 except PermissionError:
-    print("You do not have permissions to change to {0}".format(path))
+    append_log("You do not have permissions to change to {0}".format(path))
 
 def main(ofile):
     with open(ofile, newline='') as csvfile:
@@ -30,13 +43,21 @@ def main(ofile):
                 idx_ext = row.index('extension')
                 idx_name = row.index('name')
             else:
-                if  'idx_ext' not in  locals() or 'idx_name' not in locals():
-                    with open("error.txt", "w") as f:
-                        f.write("Errore: file csv senza i campi 'extension' e/o 'name'")
-                to_write = "\n".join([to_write, print_ext(line_count, row[idx_ext], row[idx_name])])
-            line_count += 1
-        print(to_write)
+                if 'idx_ext' not in  locals() or 'idx_name' not in locals():
+                    append_log("Errore: file csv senza i campi 'extension' e/o 'name'")
+                try:
+                    ext_n = int(row[idx_ext])
+                except:
+                    continue
 
+                ext_name = row[idx_name]
+                to_write = "\n".join([to_write, print_ext(line_count, ext_n, ext_name)])
+            line_count += 1
+        write_f(to_write,"tastierino_esterno.cfg")
+
+def write_f(text,file_name):
+    with open(file_name, "w") as file:
+        file.write(text)
 
 def print_ext(n, n_ext, lbl_ext):
     spamrow = f"""expansion_module.1.key.{n}.extension = 
@@ -53,4 +74,4 @@ if __name__ == '__main__':
     try:
         main(ofile)
     except FileNotFoundError:
-        print("File non trovato")
+        append_log("File CSV non trovato")