Script para verificar se a internet voltou. Quando volta, toca um alarme.

internet-test.sh

# Verify it a website is back, or the internet access is back. When it is back,
# an alarm rings.
#
# Depends of ticktimer: https://github.com/algorich/ticktimer
#
# Author: Hugo Maia Vieira <[email protected]>
#

while :
do
    wget -q -O /dev/null http://www.google.com.br
    if [ "$?" == 0 ]
    then
        ticktimer 0:1
        break
    fi
    # wait for 1 minute to try again
    sleep 3600
done