diff --git a/services_scripts/basic_functions.py b/services_scripts/basic_functions.py
index a991301..9fb9536 100644
--- a/services_scripts/basic_functions.py
+++ b/services_scripts/basic_functions.py
@@ -1,4 +1,4 @@
-import os
+import os, glob
 
 
 def create_folders(directory, num_folders):
@@ -18,4 +18,15 @@ def create_folders(directory, num_folders):
     folder_name = f"layer_{i}"
     folder_path = os.path.join(directory, folder_name)
     os.makedirs(folder_path)
-    print(f"Created folder: {folder_path}")
\ No newline at end of file
+    print(f"Created folder: {folder_path}")
+
+
+# In a folder (including several sub folders) this function extract
+# .shp files from each subfolder
+def find_shp_files(root_folder):
+  shp_files = []
+  for foldername, _, _ in sorted(os.walk(root_folder)):  # Sort folders alphabetically
+    for filename in sorted(glob.glob(os.path.join(foldername, '*.shp'))):
+      new_file_name = filename.replace('\\', r'/')
+      shp_files.append(new_file_name)
+  return shp_files