Check if machine is connected to the internet

check-devices-online.sh

#!/bin/bash

# Taken from https://stackoverflow.com/a/44280885/2025722
# Added more devices (mainly from docker) to excluded list
find /sys/class/net/ -maxdepth 1 -mindepth 1 ! -name "*lo*" ! -name "veth*" ! -name "br-*" ! -name "docker*" -exec sh -c 'cat "$0"/carrier 2>&1' {} \; | grep -q '1'

check-with-wget.sh

#!/bin/bash

# Taken from https://stackoverflow.com/a/26820300/2025722

wget -q --spider http://google.com

if [ $? -eq 0 ]; then
    echo "Online"
else
    echo "Offline"
fi