diff --git a/main.py b/main.py
index e62f760..06a254a 100644
--- a/main.py
+++ b/main.py
@@ -5,8 +5,10 @@ import sys
 import signal
 import toml
 import os
+import subprocess
 from watchdog.observers import Observer
 from watchdog.events import FileSystemEventHandler
+from singleton import SingleInstance, SingleInstanceException
 from pathlib import Path
 
 
@@ -38,11 +40,14 @@ def read_toml(file_path):
 class LogFileHandler(FileSystemEventHandler):
     def __init__(self, log_filename):
         self.log_filename = log_filename
+        self.last_line_log = None
 
     def on_modified(self, event):
         if event.is_directory:
             return
-        print(event)
+        print(self.log_filename, event)
+        # определяем какие изменения произошли в файле
+
         # elif event.event_type == 'modified' and event.src_path == self.log_filename:
         #     # Обработка изменений в лог-файле
         #     with open(event.src_path, 'r') as file:
@@ -54,9 +59,15 @@ class LogFileHandler(FileSystemEventHandler):
 
 # Press the green button in the gutter to run the script.
 if __name__ == '__main__':
-    # Получение информации о системе
-    # system_info = platform.system()
-    # print(f"System: {system_info}")
+    # Проверка на запуск второго экземпляра
+    try:
+        me = SingleInstance(flavor_id="tacacs_watcher")
+    except SingleInstanceException:
+        print("Another instance is already running, quitting.")
+        sys.exit(1)
+    print(sys.platform, me.lockfile)
+
+
     # Установка обработчика сигнала
     signal.signal(signal.SIGTERM, handler_stop)
     # Считывание имени config-файла их аргументов командной строки
@@ -70,10 +81,9 @@ if __name__ == '__main__':
         print(config['hello'])
     interval = config['interval'] if 'interval' in config else 1
     # получаем все группы в конфиге
-    group_keys = [key for key, value in config.items() if isinstance(value, dict)]
-    count_valid_groups = 0
+    groups = [key for key, value in config.items() if isinstance(value, dict)]
     observers = []
-    for group in group_keys:
+    for group in groups:
         if 'log_in' not in config[group]:
             print(f"Config '{config_file}' not have key 'log_in' in group '{group}' (see config '{config_file}').")
             continue
@@ -87,17 +97,16 @@ if __name__ == '__main__':
             print(f"Directory '{config[group]['outdir']}' not exist (see config '{config_file}').")
             continue
         observers.append(Observer())
-        observers[count_valid_groups].schedule(LogFileHandler(config[group]['log_in']),
-                                               path=os.path.dirname(config[group]['log_in']),
-                                               recursive=False)
-        observers[count_valid_groups].start()
-        count_valid_groups += 1
+        observers[-1].schedule(LogFileHandler(config[group]['log_in']),
+                               path=os.path.dirname(config[group]['log_in']),
+                               recursive=False)
+        observers[-1].start()
 
         # observer = Observer()
         # event_handler = LogFileHandler(config[group]['log_in'])
         # observer.schedule(event_handler, path=os.path.dirname(config[group]['log_in']), recursive=False)
 
-    if count_valid_groups == 0:
+    if len(observers) == 0:
         # если нет ни одной валидной группы, то выходим
         print(f"Config '{config_file}' not have valid groups (see config '{config_file}').")
         sys.exit(1)