You can even use the GUI: http://osxdaily.com/2015/04/23/sniff-packet-capture-packet-trace-mac-os-x-wireless-diagnostics/ http://osxdaily.com/2015/04/23/sniff-p

You can even use the GUI: http://osxdaily.com/2015/04/23/sniff-packet-capture-packet-trace-mac-os-x-wireless-diagnostics/ http://osxdaily.com/2015/04/23/sniff-packet-capture-packet-t... There's bunch of cool options, including WiFi quality scan.