Shell Programming and Scripting

pinger ()
{
ping_stat=`ping -c 4 host.name | grep loss | awk '{print $7}'`
echo "Packet loss reported = $ping_stat"
test_
}

test_ ()
{
if [[ $ping_stat < 25% ]]
        then
                if [[ $ping_count < 2 ]]
                        then
                                let ping_count=ping_count+1
                                echo "More than 25% packet loss! I will take a nap for 2 minutes and then try again before I determine wether or not the host is down!"
                                sleep 120
                                echo "Trying again! Ping_count is $ping_count."
                                pinger
                        else
                                echo "The host host.name does not respond to ping or is heavily loaded with traffic. Packet loss is $ping_stat. Please investigate ASAP!"

                fi
        else
                echo "Host is responding well!"
fi

}
for _switch ; do
        case $_switch in
        -remote)
                ping_count=1
                pinger 
                ;;
        -boot)
                sleep 90
                get_ip=`ifconfig em0 | grep inet | awk '{print $2'}`
                get_hostname=`uname -n`
                message="$get_hostname has just (re)booted. (new) IP is $get_ip"
                sms=`echo $message | sed 's/ /+/g'`
#              code for sending sms goes here!
                echo $message > /tmp/ip_mail.txt
                mail -s "$get_hostname" mail@he.re < /tmp/ip_mail.txt
                rm /tmp/ip_mail.txt
                ;;
        esac

  | sed 's/%//g'

if [[ $ping_stat -lt 25 ]]

ping_stat=`ping -c 4 $2 | grep loss | awk '{print $7}' | sed 's/%//g'`