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From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Ron McDowell <rcm@fuzzwad.org>
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Date: Tue, 03 Apr 2012 16:26:11 -0600
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Cc: freebsd-current <freebsd-current@freebsd.org>
Subject: Re: Switching on/off 5V power to a USB port
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On Tue, 2012-04-03 at 17:13 -0500, Ron McDowell wrote:
> I just got a little USB powered fan and it sure would be nice if I could 
> have cron on my FreeBSD box turn it on or off at certain times by 
> switching off the 5V line on a USB port.  Anyone know how I can do 
> that?  Thanks.
> 
> BTW this is a pretty decent fan for the money. :)  
> http://www.amazon.com/gp/product/B0033WSDOM/
> 

The usbconfig(8) command has power_on and power_off commands.  I've
never used them so I can't say for sure they'll do what you want.

-- Ian