diff --git a/bella/lister.py b/bella/lister.py
new file mode 100644
index 00000000..6273d354
--- /dev/null
+++ b/bella/lister.py
@@ -0,0 +1,55 @@
+import sys
+import os
+import random
+
+# function define
+
+def nomal_mode():
+    print("nomal mode")
+    for (path, dirs, files) in os.walk(sys.argv[1]):
+    # print("# root : " + root)
+        if len(dirs) > 0:
+            for dir_name in dirs:
+                print("dir: " + dir_name)
+
+        if len(files) > 0:
+            for file_name in files:
+                print("file: " + file_name)
+
+def random_mode():
+    print("random mode")
+    randList = []
+    for (path, dirs, files) in os.walk(sys.argv[1]):
+        if len(dirs) > 0:
+            for dir_name in dirs: 
+                randList.append(dir_name)
+
+        if len(files) > 0:
+            for file_name in files:
+                randList.append(file_name)
+
+
+
+    sampleList = random.sample(randList, len(randList))
+
+    for i in sampleList:
+        print(i)
+
+# =====================================================
+# main
+
+length = len(sys.argv)
+if length>2:
+    option = sys.argv[2]
+
+
+if length == 2:
+    nomal_mode()
+                
+
+elif option == "random":
+    random_mode()
+    
+
+elif option == "-ignore":
+    print("ignore mode")