I'm currently trying to do some physical debugging with one of our devices. It would be very useful to be able to use a command to output a list of available wireless networks to the command line or to a file (which I could then run a diff on later). Is there a way to do this in Windows 7?
netsh wlan show networks should work for you.
You can save output to a text file by using redirection like so:
netsh wlan show networks > somefile.txt