upordown

#!/bin/bash

# The beep alias is actually in my .bashrc but I'll include it here
alias beep='play 2>/dev/null -n synth 0.5 tri  1000.0'

nc -z google.com 80 2>/dev/null
if [ $? == 0 ]; then
   connectednow=1;
   echo "connection was intially up @ approximately  $(date '+%r %m/%d/%Y')" >> ~/Desktop/connection.rpt
else
   connectednow=0;
   echo "connection was intially down @ approximately  $(date '+%r %m/%d/%Y')" >> ~/Desktop/connection.rpt
fi

connectedbefore=$connectednow

while [ 1 ]; do

nc -z google.com 80 2>/dev/null
if [ $? == 0 ]; then connectednow=1; else connectednow=0; fi

if [ $connectednow != $connectedbefore ]; then
   changedetected=1;
else
   changedetected=0;
fi

if [ "$changedetected" == 1 ]; then
   if [ "$connectednow" == 1 ]; then
      echo "connection restored @ approximately  $(date '+%r %m/%d/%Y')" >> ~/Desktop/connection.rpt
      beep;beep
      connectedbefore=1
   else
      echo "connection lost @ approximately $(date '+%r %m/%d/%Y')" >> ~/Desktop/connection.rpt
      beep;beep
      connectedbefore=0
   fi
fi

# Random sleep probably not necessary but... just seemed friendlier.
sleep $(shuf -i5-20 -n1)

done