From owner-freebsd-wireless@FreeBSD.ORG  Wed Oct 12 14:55:03 2011
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Date: Wed, 12 Oct 2011 08:33:27 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: wireless@freebsd.org
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Subject: Detecting a wireless interface
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sysctl dev.ath.0 has lots of things that are suggestive about 
an interface being wireless (txantenna), but 
nothing definitive.

ifconfig ath0 | egrep 'media:.*Wireless' is inelegant.

Is there a better way to detect that an interface is wireless or wired 
from a shell script?