diff --git a/FileSystem.cs b/FileSystem.cs
index 676202d..e72c797 100644
--- a/FileSystem.cs
+++ b/FileSystem.cs
@@ -149,6 +149,79 @@ namespace CMLeonOS
             return fileList;
         }
 
+        public List<string> GetDirectoryList(string path = ".")
+        {
+            string fullPath = GetFullPath(path);
+            List<string> dirList = new List<string>();
+            
+            try
+            {
+                if (Directory.Exists(fullPath))
+                {
+                    var dirs = Directory.GetDirectories(fullPath);
+                    foreach (var dir in dirs)
+                    {
+                        string dirName = Path.GetFileName(dir);
+                        dirList.Add(dirName);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error getting directory list: {ex.Message}");
+            }
+            
+            return dirList;
+        }
+
+        public List<string> GetFullPathFileList(string path = ".")
+        {
+            string fullPath = GetFullPath(path);
+            List<string> fileList = new List<string>();
+            
+            try
+            {
+                if (Directory.Exists(fullPath))
+                {
+                    var files = Directory.GetFiles(fullPath);
+                    foreach (var file in files)
+                    {
+                        fileList.Add(file);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error getting file list: {ex.Message}");
+            }
+            
+            return fileList;
+        }
+
+        public List<string> GetFullPathDirectoryList(string path = ".")
+        {
+            string fullPath = GetFullPath(path);
+            List<string> dirList = new List<string>();
+            
+            try
+            {
+                if (Directory.Exists(fullPath))
+                {
+                    var dirs = Directory.GetDirectories(fullPath);
+                    foreach (var dir in dirs)
+                    {
+                        dirList.Add(dir);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error getting directory list: {ex.Message}");
+            }
+            
+            return dirList;
+        }
+
         public void CreateFile(string path, string content = "")
         {
             string fullPath = GetFullPath(path);
diff --git a/Nano.cs b/Nano.cs
index 362e4e0..de3780c 100644
--- a/Nano.cs
+++ b/Nano.cs
@@ -661,7 +661,7 @@ namespace CMLeonOS
             Console.BackgroundColor = ConsoleColor.White;
             Console.ForegroundColor = ConsoleColor.Black;
             Console.SetCursorPosition(0, 0);
-            string text = "  Nano Editor 1.2";
+            string text = "  CMLeonOS Nano Editor";
             Console.WriteLine(text + new string(' ', consoleWidth - text.Length));
 
             string displayName = path == null ? "New File" : System.IO.Path.GetFileName(path);
diff --git a/Shell.cs b/Shell.cs
index d5d5ffc..9f7f859 100644
--- a/Shell.cs
+++ b/Shell.cs
@@ -434,6 +434,9 @@ namespace CMLeonOS
                 case "find":
                     FindFile(args);
                     break;
+                case "tree":
+                    ShowTree(args);
+                    break;
                 case "getdisk":
                     GetDiskInfo();
                     break;
@@ -1324,6 +1327,80 @@ namespace CMLeonOS
             }
         }
 
+        private void ShowTree(string args)
+        {
+            string startPath = string.IsNullOrEmpty(args) ? "." : args;
+            string fullPath = fileSystem.GetFullPath(startPath);
+            
+            if (!System.IO.Directory.Exists(fullPath))
+            {
+                ShowError($"Directory not found: {startPath}");
+                return;
+            }
+            
+            try
+            {
+                Console.WriteLine(fullPath);
+                PrintDirectoryTree(fullPath, "", true);
+            }
+            catch (Exception ex)
+            {
+                ShowError($"Error displaying tree: {ex.Message}");
+            }
+        }
+
+        private void PrintDirectoryTree(string path, string prefix, bool isLast)
+        {
+            try
+            {
+                var dirs = fileSystem.GetFullPathDirectoryList(path);
+                var files = fileSystem.GetFullPathFileList(path);
+                
+                int totalItems = dirs.Count + files.Count;
+                int current = 0;
+                
+                foreach (var dir in dirs)
+                {
+                    current++;
+                    bool isLastItem = current == totalItems;
+                    string connector = isLastItem ? "+-- " : "|-- ";
+                    string newPrefix = prefix + (isLastItem ? "    " : "|   ");
+                    
+                    string dirName = System.IO.Path.GetFileName(dir);
+                    Console.WriteLine($"{prefix}{connector}{dirName}/");
+                    
+                    PrintDirectoryTree(dir, newPrefix, isLastItem);
+                }
+                
+                foreach (var file in files)
+                {
+                    current++;
+                    bool isLastItem = current == totalItems;
+                    string connector = isLastItem ? "+-- " : "|-- ";
+                    
+                    string fileName = System.IO.Path.GetFileName(file);
+                    Console.WriteLine($"{prefix}{connector}{fileName}");
+                }
+            }
+            catch (System.IO.DirectoryNotFoundException)
+            {
+                ShowError($"Directory not found: {path}");
+            }
+            // catch (System.IO.UnauthorizedAccessException)
+            // {
+            //     ShowError($"Access denied to directory: {path}");
+            // }
+            catch (Exception ex)
+            {
+                string errorMsg = ex.Message;
+                if (string.IsNullOrEmpty(errorMsg))
+                {
+                    errorMsg = $"Error type: {ex.GetType().Name}";
+                }
+                ShowError($"Error reading directory {path}: {errorMsg}");
+            }
+        }
+
         private void GetDiskInfo()
         {
             Console.WriteLine("====================================");