wifiping

#!/usr/bin/env bash

set -o errexit
set -o pipefail

# BSSID
# CHANNEL
# SSID
# CtlRSSI

cmd="/System/Library/PrivateFrameworks/Apple*.framework/Versions/Current/Resources/airport -I"

printf 'RSI\tAP MAC\t\t\tSSID\n'
while true; do
	$cmd | sed 's/:/|/' | grep -e 'BSSID' -e 'SSID' -e 'CtlRSSI' | cut -f2 -d '|' | paste -s
  sleep 0.5
done

I use this script all the time to walk around my house and see the relative wifi signal strength. It shows the access point MAC address (I have 6), the RSSI and the SSID.