网络流量监控shell脚本

网络收发包计数记录在 /proc/net/dev 文件中, 要取得流量, 只需要读取里面的内容两次, 然后相减, 再除以时间间隔即可.

#!/bin/bash

#Usage1,record in file:    netmonitor <MinKB> <Interval> <FileName>#Usage2,print on terminal: netmonitor <MinKB> <Interval>#Record the value great than 100KB, 3 second Interval:#Example1,record: netmonitor 100 3 xxx.txt#Example2,print: netmonitor 100 3

#参数说明#第一个是速度记录的下限，单位是KB，即超过多少KB才记录，0为全部记录#第二个参数是采样间隔，即隔多少秒记录一次#第三个参数是输出的文件名，为空的话就直接在终端打印

#xieqianli#2011-4-25

#同时修改下列变量可以固定参数，使用脚本时就无需参数MinKB="$1"Interval="$2"FileName="$3"NetDev="wlan0"

#检查参数完整性if [ "$Interval" == "" ];then    echo "Usage1,record in file:     netmonitor <MinKB> <Interval> <FileName>"    echo "Usage2,print on terminal:  netmonitor <MinKB> <Interval>"    echo "Record the values great than 100KB, 3 seconds Interval:"    echo "Example1,record:   netmonitor 100 3 xxx.txt"    echo "Example2,print:    netmonitor 100 3"    exit 1fi

#检查 MinKB 参数的合法性check=`echo $MinKB | grep "[^0-9]"`if [ "$check" != "" ];then    echo "$MinKB is not a number"    exit 0fi

len=${#MinKB}char1=`echo $MinKB | cut -c 1`if [ $(($len)) -gt $((1)) -a "$char1"=="0" ];then    echo "$MinKB is not a number"    exit 0fi

#检查 Interval 参数的合法性check=`echo $Interval | grep "[^0-9]"`if [ "$check" != "" ];then    echo "$Interval is not a number"    exit 0fi

len=${#Interval}char1=`echo $Interval | cut -c 1`if [ $(($len)) -gt $((1)) -a "$char1"=="0" ];then    echo "$Interval is not a number"    exit 0fi

while [ 1 ]do    #读取已接收和已发送字节数，间隔一秒    REC1=`cat /proc/net/dev | grep $NetDev | sed ‘s/:/ /‘ | tr -s " " | cut -d " " -f 3`    SEND1=`cat /proc/net/dev | grep $NetDev | sed ‘s/:/ /‘ | tr -s " " | cut -d " " -f 11`    sleep $Interval    REC2=`cat /proc/net/dev | grep $NetDev | sed ‘s/:/ /‘ | tr -s " " | cut -d " " -f 3`    SEND2=`cat /proc/net/dev | grep $NetDev | sed ‘s/:/ /‘ | tr -s " " | cut -d " " -f 11`

    if [ $((REC2)) -lt $((REC1)) ];then        exit 1    fi

    if [ $((SEND2)) -lt $((SEND1)) ];then        exit 1    fi

    RESULT_REC=$((($REC2-$REC1)/$Interval))    RESULT_SENT=$((($SEND2-$SEND1)/$Interval))

    #进行B,KB和MB的单位换算    if [ $RESULT_REC -lt $((1024)) ]; then        SPEED_REC="$RESULT_REC B "    elif [ $RESULT_REC -gt $((1024)) -a $RESULT_REC -lt $((1048576)) ]; then        SPEED_REC="$(($RESULT_REC/1024)) KB"    elif [ $RESULT_REC -gt $((1048576)) ];then        SPEED_REC="$(($RESULT_REC/1048576)) MB"    fi

    if [ $RESULT_SENT -lt $((1024)) ]; then        SPEED_SENT="$RESULT_SENT B "    elif [ $RESULT_SENT -gt $((1024)) -a $RESULT_SENT -lt $((1048576)) ]; then        SPEED_SENT="$(($RESULT_SENT/1024)) KB"    elif [ $RESULT_SENT -gt $((1048576)) ];then        SPEED_SENT="$(($RESULT_SENT/1048576)) MB"    fi

    #求时间    TIME=`date`

    #左边填充空格，把结果进行右对齐    ZERO=$((8-${#SPEED_REC}))    for (( i=0; i<$ZERO; i=i+1 ))    do        SPEED_REC=" $SPEED_REC"    done

    ZERO=$((8-${#SPEED_SENT}))    for (( i=0; i<$ZERO; i=i+1 ))    do        SPEED_SENT=" $SPEED_SENT"    done

    REC_KB="$(($RESULT_REC/1024))"    SEND_KB="$(($RESULT_SENT/1024))"

    #过滤掉小于 MinKB 的记录    if [ "$MinKB" != "0" -a $((REC_KB)) -lt $MinKB -a $((SEND_KB)) -lt $MinKB ];then        continue    fi

    #输出结果    if [ "$FileName" = "" ];then        echo "$TIME    Receive:$SPEED_REC    Send:$SPEED_SENT"    else        echo "$TIME    Receive:$SPEED_REC    Send:$SPEED_SENT" >> $FileName    fidone