"Is Comcast up?" shell script

check_comcast.sh

#!/bin/sh
# Original version developed by Reverend Booyah! (SteveCook.net)

# First, ping Comcast's web server
ping -q -c 2 www.comcast.net &> /dev/null
if [ $? -ne 0 ] ; then
        echo "Comcast didn't work"

# If Comcast fails, that's Strike 1. Next, ping Yahoo's web server
        ping -q -c 2 yahoo.com &> /dev/null
        if [ $? -ne 0 ] ; then
                echo "Yahoo didn't work"

# If Yahoo fails, that's Strike 2. Next, ping Google's web server
                ping -q -c 2 google.com &> /dev/null
                if [ $? -ne 0 ] ; then
                        echo "Google didn't work"

# Since Google also failed, that's Strike 3. Time to power cycle the modem and router!
                        echo "Initiating reboot script"

# Send yourself an email with the script output
                        /usr/bin/smtp-cli --missing-modules-ok --ipv4 --server=localhost --host=mail.example.com --port=587 --enable-auth --user username --pass password --from root@example.com --to yourself@example.com --subject "Reboot Alert"

# Pipe the reboot script through telnet
                        /usr/local/bin/reboot_script.php | telnet
                fi
        fi
fi