traffic_monitor.sh

function traffic_monitor {
    # 系统版本(linux发行版)
    OS_NAME=$(awk -F= '$1=="ID"{print $2}' /etc/os-release)

    # 网口名
    eth=$1
    
    #判断网卡存在与否,不存在则退出
    if [ ! -d /sys/class/net/$eth ]; then
        echo -e "Network-Interface Not Found"
        echo -e "You system have network-interface:\n$(ls /sys/class/net)"
        exit 5
    fi

    while :; do
        # 状态
        STATUS="fine"

        # 获取当前时刻网口接收与发送的流量
        RXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')
        TXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')

        # 获取1秒后网口接收与发送的流量
        sleep 1
        RXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')
        TXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')

        clear

        # 获取这1秒钟实际的进出流量
        RX=$((${RXnext} - ${RXpre}))
        TX=$((${TXnext} - ${TXpre}))

        # 判断接收流量如果大于MB数量级则显示MB单位,否则显示KB数量级
        if [[ $RX -lt 1024 ]]; then
            RX="${RX}B/s"
        elif [[ $RX -gt 1048576 ]]; then
            RX=$(echo $RX | awk '{print $1/1048576 "MB/s"}')
            $STATUS="busy"
        else
            RX=$(echo $RX | awk '{print $1/1024 "KB/s"}')
        fi

        # 判断发送流量如果大于MB数量级则显示MB单位,否则显示KB数量级
        if [[ $TX -lt 1024 ]]; then
            TX="${TX}B/s"
        elif [[ $TX -gt 1048576 ]]; then
            TX=$(echo $TX | awk '{print $1/1048576 "MB/s"}')
        else
            TX=$(echo $TX | awk '{print $1/1024 "KB/s"}')
        fi

        # 打印信息
        echo -e "System: $OS_NAME"
        echo -e "Date:  $(date +%F)"
        echo -e "Time:  $(date +%k:%M:%S)"
        echo -e "Port:  $1"
        echo -e "Status: $STATUS"
        echo -e " \t  RX \tTX"
        echo "------------------------------"
        # 打印实时流量
        echo -e "$eth \t $RX  $TX "
        echo "------------------------------"
        # 退出信息
        echo -e "Press 'Ctrl+C' to exit"

    done

}

# 判断执行参数
if [[ -n "$1" ]]; then
    # 执行函数
    traffic_monitor $1
else
    echo -e "None parameter,please add system netport after run the script! \nExample: 'sh traffic_monitor eth0'"
fi