Run a loop of ping/interface status checks to help diagnose network issues

macos_wifi_status.sh

#!/bin/bash

logfile=~/Desktop/wifi_status.log
interval_sec=10

interface=en0
interface_info_cmd="/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I"

# Combine stdout with stderr and pipe to a log file and the screen
exec > >(tee -a "$logfile") 2>&1

# Get a list of servers to ping at random, here we use the specified interface's DNS servers
ping_servers=($(scutil --dns | grep -B4 $interface | awk '/nameserver/ { print $NF }'))
#ping_servers=(8.8.8.8 8.8.4.4)

while [ 1 ]; do
  ping_dest=${ping_servers[ $RANDOM % ${#ping_servers[@]} ]}

  echo ""
  date
  echo "Ping $ping_dest: $(ping -b $interface -c 2 -o $ping_dest | grep icmp_seq)"
  $interface_info_cmd
  sleep $interval_sec
done