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+Propellor often generates some shell code to run. 
+Examples include Propellor.Bootstrap, but also things like 
+userScriptProperty where a shell command has to be built that can be fed
+into sudo.
+
+The current code for this is just all strings and easy to make mistakes in.
+It would be good to integrate <http://hackage.haskell.org/shell-monad>
+as a way to generate shell code. --[[Joey]]