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If you’re interested on how to push machine lockdown to its absolute limits, including removing bash (and other shells) from a Linux installation among others, then you might enjoy my Industrial-strength Linux Lockdown tutorial, currently the top featured article in IBM developerWorks Linux Zone (registration required, sorry).

The second part of the tutorial is where things get really interesting, and that should be up in a week or so. Let me know what you think, either in the feedback form with the article, or in the comments here!