Very basic netwrork statistics

net-stat.sh

#!/bin/bash
# @author prochor666@gmail.com
#
# Check stats for alive network devices

# RED 1, GREEN 2 and RESET color
DEVICEDOWN=$(tput setaf 1)
DEVICEUP=$(tput setaf 2)
RESET=$(tput sgr0)

for DEVICE in $(ls -I "lo" /sys/class/net);
do
    STATEFILE="/sys/class/net/${DEVICE}/operstate"
    if [[ -f ${STATEFILE} ]];
    then
        STATE="$(cat ${STATEFILE})"
        if [[ "${STATE}" == "up" ]];
        then
            RXBYTESFILE="/sys/class/net/${DEVICE}/statistics/rx_bytes"
            TXBYTESFILE="/sys/class/net/${DEVICE}/statistics/tx_bytes"
            echo "Device ${DEVICE} is ${DEVICEUP}up${RESET}"

            if [[ -f ${RXBYTESFILE} ]];
            then
                echo "RX (download): $(cat ${RXBYTESFILE})"
            fi

            if [[ -f ${TXBYTESFILE} ]];
            then
                echo "TX (upload): $(cat ${TXBYTESFILE})"
            fi
        else
            echo "DEVICE ${DEVICE} is ${DEVICEDOWN}down${RESET}"
        fi
    fi
done