Interface Stats

Sometime you just wanna check how many packets and bytes are transferred via network interface. For my Linode NTP server I solved that need using the following script:

#!/bin/bash

INTERFACE=eth0

LINE_COUNT=`tput lines`
LINE=-1

while true
do
if (( LINE % (LINE_COUNT-1) == 0 ))
then
echo "INTERFACE RX bytes packets TX bytes packets"
fi
LINE=$(( LINE+1 ))

RX1_BYTES=$RX2_BYTES
TX1_BYTES=$TX2_BYTES
RX1_PACKETS=$RX2_PACKETS
TX1_PACKETS=$TX2_PACKETS
sleep 1
RX2_BYTES=`cat /sys/class/net/$INTERFACE/statistics/rx_bytes`
TX2_BYTES=`cat /sys/class/net/$INTERFACE/statistics/tx_bytes`
RX2_PACKETS=`cat /sys/class/net/$INTERFACE/statistics/rx_packets`
TX2_PACKETS=`cat /sys/class/net/$INTERFACE/statistics/tx_packets`

if [[ "$RX1_BYTES" != "" ]]
then
RX_BYTES=$(( RX2_BYTES - RX1_BYTES ))
TX_BYTES=$(( TX2_BYTES - TX1_BYTES ))
RX_PACKETS=$(( RX2_PACKETS - RX1_PACKETS ))
TX_PACKETS=$(( TX2_PACKETS - TX1_PACKETS ))

printf "%-7s %'11d %'7d %'11d %'7d\n" $INTERFACE $RX_BYTES $RX_PACKETS $TX_BYTES $TX_PACKETS
fi
done

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