diff --git a/GitCommit.txt b/GitCommit.txt
index 9f42be1..5858063 100644
--- a/GitCommit.txt
+++ b/GitCommit.txt
@@ -1 +1 @@
-b36e3ba
\ No newline at end of file
+b80c5b4
\ No newline at end of file
diff --git a/System/FileSystem.cs b/System/FileSystem.cs
index 0f156c7..6cadc32 100644
--- a/System/FileSystem.cs
+++ b/System/FileSystem.cs
@@ -14,6 +14,19 @@ namespace CMLeonOS
             currentDirectory = @"0:\";
         }
 
+        private static bool ContainsInvalidChars(string input)
+        {
+            char[] invalidChars = { '<', '>', ':', '"', '|', '?', '*' };
+            foreach (char c in invalidChars)
+            {
+                if (input.Contains(c.ToString()))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
         public FileSystem(string initialPath)
         {
             if (string.IsNullOrEmpty(initialPath))
@@ -67,6 +80,12 @@ namespace CMLeonOS
 
         public void MakeDirectory(string path)
         {
+            if (ContainsInvalidChars(path))
+            {
+                Console.WriteLine("Error: Directory name contains invalid characters: < > : \" | ?");
+                return;
+            }
+            
             string fullPath = GetFullPath(path);
             
             try
@@ -363,6 +382,28 @@ namespace CMLeonOS
                 return currentDirectory;
             }
             
+            if (path.Length > 255)
+            {
+                Console.WriteLine("Error: Path too long (maximum 255 characters)");
+                return currentDirectory;
+            }
+            
+            char[] invalidChars = { '<', '>', ':', '"', '|', '?', '*' };
+            foreach (char c in invalidChars)
+            {
+                if (path.Contains(c.ToString()))
+                {
+                    Console.WriteLine($"Error: Invalid character in path: '{c}'");
+                    return currentDirectory;
+                }
+            }
+            
+            if (path.Contains("//") || path.Contains("\\\\"))
+            {
+                Console.WriteLine("Error: Path contains consecutive slashes");
+                return currentDirectory;
+            }
+            
             if (path.StartsWith(@"0:\"))
             {
                 return path;
@@ -467,6 +508,16 @@ namespace CMLeonOS
             
             string normalizedPath = path;
             
+            while (normalizedPath.Contains("//"))
+            {
+                normalizedPath = normalizedPath.Replace("//", "/");
+            }
+            
+            while (normalizedPath.Contains("\\\\"))
+            {
+                normalizedPath = normalizedPath.Replace("\\\\", "\\");
+            }
+            
             if (normalizedPath.StartsWith("/"))
             {
                 normalizedPath = normalizedPath.Substring(1);
diff --git a/System/UserSystem.cs b/System/UserSystem.cs
index abd3af7..08c7f31 100644
--- a/System/UserSystem.cs
+++ b/System/UserSystem.cs
@@ -53,6 +53,19 @@ namespace CMLeonOS
             return Convert.ToBase64String(sha256.GetHash());
         }
 
+        private static bool ContainsInvalidChars(string input)
+        {
+            char[] invalidChars = { '<', '>', ':', '"', '|', '?', '*', '/', '\\' };
+            foreach (char c in invalidChars)
+            {
+                if (input.Contains(c.ToString()))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
         public UserSystem()
         {
             EnsureSysDirectoryExists();
@@ -388,6 +401,17 @@ namespace CMLeonOS
                     username = global::System.Console.ReadLine();
                 }
 
+                while (ContainsInvalidChars(username))
+                {
+                    CMLeonOS.UI.TUIHelper.SetColors(global::System.ConsoleColor.Red, global::System.ConsoleColor.Black);
+                    global::System.Console.SetCursorPosition(7, 24);
+                    global::System.Console.Write("Username contains invalid characters: < > : \" | ? / \\      ");
+                    CMLeonOS.UI.TUIHelper.SetColors(global::System.ConsoleColor.White, global::System.ConsoleColor.Black);
+                    global::System.Console.SetCursorPosition(7, 7);
+                    global::System.Console.Write("Username: ");
+                    username = global::System.Console.ReadLine();
+                }
+
                 CMLeonOS.UI.TUIHelper.SetColors(global::System.ConsoleColor.White, global::System.ConsoleColor.Black);
                 global::System.Console.SetCursorPosition(7, 8);
                 global::System.Console.Write("Password: ");
diff --git a/interpreter/UniLua/LuaOsLib.cs b/interpreter/UniLua/LuaOsLib.cs
index f2934a5..aa8e12c 100644
--- a/interpreter/UniLua/LuaOsLib.cs
+++ b/interpreter/UniLua/LuaOsLib.cs
@@ -39,6 +39,7 @@ namespace UniLua
 				new NameFuncPair("base64decrypt", OS_Base64Decrypt),
 				new NameFuncPair("timerstart", OS_TimerStart),
 				new NameFuncPair("timerstop", OS_TimerStop),
+				new NameFuncPair("osversion", OS_Osversion),
 				new NameFuncPair("tui_drawbox", OS_TUIDrawBox),
 				new NameFuncPair("tui_drawtext", OS_TUIDrawText),
 				new NameFuncPair("tui_setcolor", OS_TUISetColor),
@@ -240,6 +241,13 @@ namespace UniLua
 			return 1;
 		}
 
+		private static int OS_Osversion(ILuaState lua)
+		{
+			string version = CMLeonOS.Version.FullVersion;
+			lua.PushString(version);
+			return 1;
+		}
+
 		private static int OS_TUIDrawBox(ILuaState lua)
 		{
 			int x = (int)lua.L_CheckNumber(1);
diff --git a/shell/Commands/User/UserCommand.cs b/shell/Commands/User/UserCommand.cs
index 2417b35..627456b 100644
--- a/shell/Commands/User/UserCommand.cs
+++ b/shell/Commands/User/UserCommand.cs
@@ -8,6 +8,19 @@ namespace CMLeonOS.Commands.User
     {
         private static CMLeonOS.UserSystem userSystem;
 
+        private static bool ContainsInvalidChars(string input)
+        {
+            char[] invalidChars = { '<', '>', ':', '"', '|', '?', '*', '/', '\\' };
+            foreach (char c in invalidChars)
+            {
+                if (input.Contains(c.ToString()))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
         public static void SetUserSystem(CMLeonOS.UserSystem system)
         {
             userSystem = system;
@@ -80,6 +93,12 @@ namespace CMLeonOS.Commands.User
                 string password = parts[3];
                 bool isAdmin = userType == "admin";
                 
+                if (ContainsInvalidChars(username))
+                {
+                    showError("Error: Username contains invalid characters: < > : \" | ? / \\");
+                    return;
+                }
+                
                 userSystem.AddUser($"{username} {password}", isAdmin);
             }
             else if (subCommand == "delete")