Shell to list all connected devices of a hotspot

wifi.sh

wifiInterface=$(iw dev | grep Interface | awk '{print $2}')
ssid=$(iw dev $wifiInterface info | grep ssid | awk '{print $2}')
echo "Your SSID is $ssid."
connections=$(ip neigh | grep $wifiInterface)

ips=()
macs=()
devices=()
while IFS= read -r conn;
do 
  lladdr=$(echo $conn | awk '{print $4}')
  if [[ $lladdr == "lladdr" ]];
  then
    ip=$(echo $conn | awk '{print $1}')
    mac=$(echo $conn | awk '{print $5}')
    name=$(avahi-resolve --address $ip)
    if [[ $name != "" ]];
    then
      device=$(echo $name | awk '{print $2}')
      ips+=($ip)
      macs+=($mac)
      devices+=($device)
    fi
  fi
done <<< "$connections"

num=${#ips[@]}

plural() {
  local dn="device"
  if [[ num -gt 1 ]];
  then
    dn+="s"
  fi
  printf "%s" "$dn"
}

printf "$num $(plural) connecing to your hotspot!\n\n"

printf "%-15s %-25s %-20s\n" "IP" "MAC" "Device"

for (( i=0; i<${num}; i++ ));
do
  printf "%-15s %-25s %-20s\n" "${ips[$i]}" "${macs[$i]}" "${devices[$i]}"
done