LINUX下的流量监控shell脚本

#!/bin/bashPATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin;export PATHfunction traffic_monitor {  # 系统版本  OS_NAME=$(sed -n '1p' /etc/issue)  # 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 [ "1" ]  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 "==================================="    echo -e "Welcome to Traffic_Monitor stage"    echo -e "version 1.0"    echo -e "Since 2014.2.26"    echo -e "Created by showerlee"    echo -e "BLOG: http://www.showerlee.com"    echo -e "==================================="    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 $1else  echo -e "None parameter,please add system netport after run the script! \nExample: 'sh traffic_monitor eth0'"fi

# sh traffic_monitor.sh eth0