Snorby-on-Ubuntu is a project mainly written in Shell, it's free.
Docs and a script for installing Snorby on Ubuntu 10.04 or newer.
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o8o `8 `V88V"V8P' `Y8bood8P' `Y8bod8P' `Y888""8o "888"http://twitter.com/nugoat | [email protected] | grape on irc.freenode.net
I am testing this on an OpenVZ VPS running Ubuntu 10.04 Minimal. There isn't much else to say at this point.