Notify by mail if network bandwidth is High

Packages needs to be installed for sending mail :
1. libemail-valid-perl
2. libmail-sendmail-perl
3. libmailtools-perl
4. libmailutils4
5. lockfile-progs
6. mailutils
7. mailutils-common
8.mime-support
9. postfix 


#### script  Started here
## you can run this script as daemon

#!/bin/bash
mail=`dpkg -l | grep -i mailutils`
if [ ! -n "$mail" ];
then
    apt-get -y install mailutils
fi
while :
do
sleep 1
awk '{if(l1){print ($2-l1)/1024,($10-l2)/1024} else{l1=$2; l2=$10;}}' <(grep eth0 /proc/net/dev) <(sleep 1; grep eth0 /proc/net/dev) >/tmp/.netspeed >/tmp/.netkbyte

dload_kbyte=`cat /tmp/.netkbyte | awk '{print$1}'`
uload_kbyte=`cat /tmp/.netkbyte | awk '{print$2}'`

incoming=${dload_kbyte%.*}
outgoing=${uload_kbyte%.*}

if [ $incoming -gt 5000 ];
then
    IP=`/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'`
    SUBJECT="Bandwidth Limit Exceed"
    if [ ! -f /tmp/.dmail ];
    then
        echo "1" >/tmp/.dmail
        echo "$SUBJECT - Incoming bandwidth usageis high in :$HOSTNAME-$IP" | mail -s "Warning-Data Usage $IP" john@gmail.com,purval@gmail.com,martin@hotmail.com -aFrom:zuba@gmail.com
    fi
    echo "Downloading Speed is greater then 50MBit/s"
    echo "Sending Mail to Enjay Support Team"
else
    if [ -f /tmp/.dmail ];
    then
        rm -rf /tmp/.dmail
    fi
    echo "Downloading Speed is $dload_kbyte Kbytes/s"
fi

if [ $outgoing -gt 5000 ];
then
    echo "Uploading Speed is greater then 50MBit/s"
    echo "Sending Mail to Enjay Support Team..."
    IP=`/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'`
    SUBJECT="Bandwidth Limit Exceed"
    if [ ! -f /tmp/.umail ];
    then
        echo "1" >/tmp/.umail
        echo "$SUBJECT - Outgoing bandwidth usage is high in :$HOSTNAME-$IP" | mail -s "Warning-Data Usage $IP" john@gmail.com -aFrom:zuba@gmail.com
    fi
else
    if [ -f /tmp/.umail ];
    then
        rm -rf /tmp/.umail
    fi
    echo "Uploading speed is $uload_kbyte Kbyte/s"
fi
done


Notify by Email if Network Usage Limit is Exceed
 (usage limit of day)
#!/bin/bash

#stat=`vnstat | tail -1 | awk '{print $8}'`
stat=`vnstat | grep -A 2 eth0 | tail -1 | awk '{print$11}'`

IP=`/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'`

TO_ADDRESS="purval.patel@enjayworld.com"

SUBJECT="Bandwidth AVG Used"



#set bandwith limit in GiB size,

band=300



#get bandwith reports

if [ $(echo "$stat >  $band" | bc) -ne 0 ];
then
    echo "$stat >  $band" | bc
    echo $stat

    echo > /tmp/bandwidth.txt

    vnstat > /tmp/bandwidth.txt
    echo "sending mail....."
#    mail -s "$SUBJECT - $stat GiB in :$HOSTNAME-$IP" $TO_ADDRESS  < /tmp/bandwidth.txt

    echo "$SUBJECT - $stat MiB in :$HOSTNAME-$IP" | mail -s "Warning-Data Usage Limit" john@gmail.com -aFrom:purval.patel@gmail.com

else

       echo "None of the condition met"

fi