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diff --git a/filter-example.py b/filter-example.py
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+#!/usr/bin/env python3
+# This is a trivial example of a metadata filter.
+# All it does is change the name of the commit's author.
+# It could do other things, including modifying the
+# channels list
+# 
+import sys, json
+metadata = json.loads(sys.argv[1])
+
+metadata['author'] = "The Great and Powerful Oz"
+
+print json.dumps(metadata)
+# end