Fix missing or shebangs and executable bits for scripts (#10318)
diff --git a/Tools/scripts/redemo.py b/Tools/scripts/redemo.py
old mode 100644
new mode 100755
index de7f3c4..2b5ade4
--- a/Tools/scripts/redemo.py
+++ b/Tools/scripts/redemo.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 """Basic regular expression demostration facility (Perl style syntax)."""
 
 from Tkinter import *