A simple script to reboot my IPFire box if the internet isn't reachable for 45 minutes. Goes to /etc/fcron.cyclic/

reboot_if_offline.sh

#!/usr/bin/env bash

reboot_index=$(($(</var/run/reboot_index)))

reset-index(){
    echo 0 > /var/run/reboot_index
    echo "$(date +'%Y-%m-%dT%H:%M:%S%z'): $1" >> /var/log/reboot_if_offline.log
}

if [ "$(find /var/run/reboot_index -mmin +1)" != "" ] && [ $reboot_index != 0 ]; then
    reset-index "index to old, reset counter"
    exit 0
fi

ping -c1 -W1 -q 8.8.8.8 &>/dev/null
status=$( echo $? )

if [ $status == 0 ] && [ $reboot_index -gt 0 ]; then
    reset-index "we're online: reset counter"
    exit 0
fi

if [ $status != 0 ]; then
    let reboot_index++
    echo $reboot_index > /var/run/reboot_index
    echo "$(date +'%Y-%m-%dT%H:%M:%S%z'): we're offline, increase index $reboot_index" >> /var/log/reboot_if_offline.log
fi

if [ $reboot_index -ge 8 ]; then
    reset-index "we're still offline, try reboot"
    /sbin/reboot
    exit 0
fi