Network Usage from console Max / Cur / Avg.

Here is a small shell script which I have used to monitor the Maximum, Current and average usage of a network interface.

#!/bin/bash

IFACE=bond0

oldbyt=(0 0);

cnt=1;

ORXB=0

OTXB=0

MAXRXB=0

MAXTXB=0

while : ; do

byte=($(/sbin/ifconfig $IFACE | \

sed -e 's/:/ /g'|awk '$2 ~ /bytes/ {print $3,$8}'));

if [ ${oldbyt[0]} -ne 0 ] && [ ${oldbyt[1]} -ne 0 ]; then

RXB="$(((${byte[0]}-${oldbyt[0]})/1024))"

TXB="$(((${byte[1]}-${oldbyt[1]})/1024))"

ORXB=$(($RXB+$ORXB))

OTXB=$((TXB+$OTXB))

[ $MAXRXB -lt $RXB ] && MAXRXB=$RXB

[ $MAXTXB -lt $TXB ] && MAXTXB=$TXB

echo -e "\fCUR RX : $RXB\tTX : $TXB\nAVG RX : $(($ORXB/$cnt))\tTX : $(($OTXB/$cnt))\nMAX RX : $MAXRXB \tTX : $MAXTXB"

cnt=$(($cnt+1))

fi

oldbyt=(${byte[@]});

sleep 1

done

I know I can do the same thing using some stock utilities like ntop or iftop, but this was a production environment and I don't want to install any thing unless it is absolute necessity.