log-internet-connected

#!/bin/bash
# Options
interval=10
ping_destination="google.com"

# Echo out time monitoring started for easy separation of sessions
echo "$(date) Connection monitoring started"
# Set previous exit code to -1 so we get connection status on start (-1 is not a
# valid exit code)
previous=-1
# infinite loop
while :; do
  ping -c 1 -W 10 $ping_destination &>/dev/null
  # keep the ping exit code
  current=$?
  # has the exit code changed?
  if [ $current -ne $previous ]; then
    # ping exits with 0 if successful
    if [ $current -eq 0 ]; then
      echo "$(date) Connected"
    else
      echo "$(date) Not connected"
    fi
  fi
  # remember the exit code for next loop
  previous=$current
  # pause for interval before looping again
  sleep $interval
done