Bash script show wifi clients on hostapd

#!/bin/sh
echo "IP address   | MAC address"
for interface in `iw dev | grep Interface | cut -f 2 -s -d" "`
do
  # for each interface, get mac addresses of connected stations/clients
  maclist=`iw dev $interface station dump | grep Station | cut -f 2 -s -d" "`
  # for each mac address in that list...
  for mac in $maclist
  do
        # extract ip from local arp table
        ip=$(arp | grep $mac | awk ' { print $1 } ')

        # found an ip tied to the mac address?
        if [ ! -z $ip ]; then

            # if found, print in the list
            echo "$ip | $mac"
        else
            echo "Not found into local arp table. Try another way..."
        fi;
  done
done