[ubuntu] how to confirm bluetooth is off on my dell inspiron n5010

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http://ubuntuforums.org – Hi I have ubuntu 12.04.2 amd64 installed on a dell inspiron n5010 and want to know how to confirm the bluetooth is turned off. I've noticed there's a bluetooth icon in the dash, but I don't really want to click on this in case it turns the bluetooth on and I can't work out how to turn it off. When I had windows installed the computer would connect with any bluetooth devices in range (including e.g. mobile phones of passers by) if I left bluetooth on! Thanks (Hardware)