Collect details about internet / wifi availability (macOS)

record.sh

#!/bin/sh

SCRIPTPATH=$(cd "$(dirname "$0")"; pwd -P)

while [ true ]
do
   ${SCRIPTPATH}/status.sh >> ${SCRIPTPATH}/log.txt
   sleep 10
done

status.sh

#!/bin/sh

ssid=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | awk '/ SSID/ {print substr($0, index($0, $2))}')

services=$(networksetup -listnetworkserviceorder | grep 'Hardware Port')

while read line; do
    sname=$(echo $line | awk -F  "(, )|(: )|[)]" '{print $2}')
    sdev=$(echo $line | awk -F  "(, )|(: )|[)]" '{print $4}')
    #echo "Current service: $sname, $sdev, $currentservice"
    if [ -n "$sdev" ]; then
        ifconfig $sdev 2>/dev/null | grep 'status: active' > /dev/null 2>&1
        rc="$?"
        if [ "$rc" -eq 0 ]; then
            currentservice="$sname"
        fi
    fi
done <<< "$(echo "$services")"

ping -c 1 www.google.com >/dev/null 2>&1
code=${?}

if [ "${code}" -eq 0 ]; then
    have_internet=1
else
    have_internet=0
fi

time=$(date +"%Y-%m-%d %H:%M:%S")
echo "${time} | Have internet: ${have_internet} | Connected through: ${currentservice} | SSID: ${ssid}"

This collection of scripts prints (status.sh) or logs (record.sh) whether or not you have internet, how you are connected to the internet, and what the wifi SSID is. This is useful for logging unreliable internet connections.

To determine if you have a functioning internet connection it pings www.google.com, but for some reason this sometimes gives unreliable results (false positives): it can claim that you don't have a functioning internet connection when you actually do have one. If you find out why these false positives occur, please comment or (even better) provide adjusted code.

Only works on macOS for now, but that's only because it relies on an obscure Apple tool to figure out which SSID you are connected to. Should be relatively straight forward to make it work on both Linux and Mac, but don't have the time now. Let me know if you manage to get it to work on both!