presence-wl.sh

#!/bin/sh
while true
do
  all=""
  for interface in $(dmesg | grep ^eth | grep 802.11 | cut -s -d: -f1)
  do
    # for each interface, get mac addresses of connected stations/clients
    maclist=$(wl -i $interface assoclist | cut -s -d" " -f2 | xargs -n 1 wl -i $interface sta_info | grep STA | cut -s -d" " -f3 | sed 's/.$//')

    # for each mac address in that list...
    for mac in $maclist
    do
      if [ -z $all ]; then
        all=$mac
      else
        all="$all\n$mac"
      fi
    done
  done
  if [ ! -z $all ]; then
    echo -e $all > /tmp/presence.wifi
  fi
sleep 5
done