Shell Programming and Scripting

if (( test $ping_stat -gt "25" ))

if (( $ping stat < 25 ))

#! /usr/local/bin/bash

pinger ()
{
ping_stat=`ping -c 4 host.name | grep loss | awk '{print $7}' | sed 's/%//g'`
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 in 2 minutes and then try again before i determine if host is down!"
                                sleep 120
                                echo "Trying again! Ping_count is $ping_count."
                                pinger
                        else
                                echo "The host $2 does not respond to ping. Please investigate ASAP!"
                                touch /tmp/no.notify.beacon
                                looper
                fi
        else
                echo "Host is responding!"
fi

}

looper ()
{
ping_stat_loop=`ping -c 4 host.name | grep loss | awk '{print $7}' | sed 's/%//g'`
echo "Packet loss reported = $ping_stat"
if (( $ping_stat_loop > 75 ))
        then
                echo "Host still down. Trying again in 60 seconds..."
                sleep 60
                looper
        else
                echo "0% packet loss! Host is alive!"
                rm -rf /tmp/no.notify.beacon
fi
}

for _switch ; do
        case $_switch in
        -remote)
                if [ -e /tmp/no.notify ]
                        then
                                exit 0
                        else
                                ping_count=1
                                pinger ;;
                fi
        -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'`
                echo $message > /tmp/ip_mail.txt
                mail -s "$get_hostname" mail@he.re < /tmp/ip_mail.txt
                rm -rf /tmp/ip_mail.txt
                echo $sms
                ;;
        esac
done

exit 0

./pingtest.sh -remote host.name

usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]
            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]
            [-P policy] [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]
            [-W waittime] [-z tos] host
       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]
            [-M mask | time] [-m ttl] [-P policy] [-p pattern] [-S src_addr]
            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]
            [-z tos] mcast-group
Packet loss reported =
./pingtest.sh: line 12: ((: > 25 : syntax error: operand expected (error token is "> 25 ")
Host is responding!

sh -x pingtest.sh -remote host.name 
+ [ -e /tmp/no.notify ]
+ ping_count=1
+ pinger
+ ping -c 4
usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]
            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]
            [-P policy] [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]
            [-W waittime] [-z tos] host
       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]
            [-M mask | time] [-m ttl] [-P policy] [-p pattern] [-S src_addr]
            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]
            [-z tos] mcast-group
+ grep loss
+ awk {print $7}
+ sed s/%//g
+ ping_stat=
+ echo Packet loss reported =
Packet loss reported =
+ test_
+
+ 1
1: not found
+ echo The host  does not respond to ping. Please investigate ASAP!
The host  does not respond to ping. Please investigate ASAP!
+ touch /tmp/no.notify.beacon
+ looper
+ ping -c 4
usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]
            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]
            [-P policy] [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]
            [-W waittime] [-z tos] host
       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]
            [-M mask | time] [-m ttl] [-P policy] [-p pattern] [-S src_addr]
            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]
            [-z tos] mcast-group
+ grep loss
+ awk {print $7}
+ sed s/%//g
+ ping_stat_loop=
+ echo Packet loss reported =
Packet loss reported =
+
+ echo Host still down. Trying again in 60 seconds...
Host still down. Trying again in 60 seconds...
+ sleep 60

pinger $2 ;;

 
ping_stat=`ping -c 4 $1 | grep loss | awk '{print $7}' | sed 's/%//g'`