SF patch #1038388:  __main__ for whichdb.py
(Contributed by Oleg Broytmann.)
diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index deb8a02..cc5ced3 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -1,3 +1,4 @@
+# !/usr/bin/env python
 """Guess which db package to use to open a db file."""
 
 import os
@@ -110,3 +111,7 @@
 
     # Unknown
     return ""
+
+if __name__ == "__main__":
+    for filename in sys.argv[1:]:
+        print whichdb(filename) or "UNKNOWN", filename