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diff --git a/Chap9PracDelUnneed.py b/Chap9PracDelUnneed.py
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+#!/usr/bin/env python3
+
+# Chapter 9 Practice Selective Copy
+# Walks through a directory tree searching for files > 100MB and deletes them.
+
+import os
+
+def deleteUnneeded(folder):
+    folder = os.path.abspath(folder)
+    for foldername, subfolders, filenames in os.walk(folder):
+        for filename in filenames:
+            fileSize = os.path.getsize(foldername + '/' + filename)
+            if int(fileSize) < 10000000:
+                continue
+            #os.unlink(filename) #Commented out to protect against accidental deletion
+            print('Deleting ' + filename + '...') #Print only to verify working correctly
+
+deleteUnneeded('/Users/username/Documents')
+print('Done')