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I want to start a program in response to system events, such as:

  • IP address changes
  • WIFI connectivity changes (whether I'm connected, and/or which network I'm connected to)
  • Volume (as in disk) changes
  • User logs on or off
  • System shuts down or restarts

Is there anything built in to do this, or is there a 3rd party tool that can do this for me?

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ControlPlane has many of the functions you're looking for, though I don't think it has any rules for connected users. I've been using it for a few months on my work MBP to switch between home and office and it's been quite good.

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any programmatically way to do this? – reza Jul 17 '12 at 23:16

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