How to check internet access using bash script in linux?

Question

In my school, the internet is not available(every night after 23:0 the school will kill the internet, to put us in bed >..<), then the ping will never stop, though I have use

Answer 1

Install fping: > less problem then ping.

fping google.com | grep alive

to use for example like:

#!/bin/bash

itest=$(fping google.com | grep alive)

while [ "$itest" == "" ] 
        do
        sleep 5
        itest=$(fping google.com | grep alive)
done
echo now online