Linux下查看网卡流量的工具

工具运行效果如下：
#iftop eth0 1 3
    ifname       in_bytes/s      out_bytes/s    total_bytes/s
      eth0              446              418              864
      eth0               70              182              252
      eth0               70              182              252

 

脚本内容如下：
#!/bin/bash
#  osdba 2009.10.22 monitor the interface's network traffic.

if [ $# -ne 3 ];then
   echo example: $0 eth0 1 10
   exit
fi

eth=$1
count=$3
interval=$2

inbytesfirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $2}')
if [ -z "$inbytesfirst" ];then
    echo The network interface $eth is not exits!
    exit 1;
fi

outbytesfirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $10}')

inpacketsfirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $3}')
outpacketsfirst=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $11}')

sleep $interval"s"
i=0
while [ "$i" -lt "$count" ]
do
   inbytesend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $2}')
   outbytesend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $10}')
   inpacketsend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $3}')
   outpacketsend=$(cat /proc/net/dev |tr ':' ' '|awk  '/'$eth'/{print $11}')

   sumbytesin=$((($inbytesend-$inbytesfirst)/$interval))
   sumbytesout=$((($outbytesend-$outbytesfirst)/$interval))
   sumpacketsin=$((($inpacketsend-$inpacketsfirst)/$interval))
   sumpacketsout=$((($outpacketsend-$outpacketsfirst)/$interval))
  
   sumbytes=$(($sumbytesin+$sumbytesout))
   sumpackets=$(($sumpacketsin+$sumpacketsout))
   if [ $(($i%20)) -eq 0 ];then
       #echo "ifname" "in_bytes/s" "out_bytes/s" "total_bytes/s" |awk '{printf("%10s %16s %16s %16s\n",$1,$2,$3,$4)}'
    echo " ifname   in_kbytes/s out_kbytes/s all_kbytes/s in_packets/s out_packets/s all_packets/s"
    echo "--------- ----------- ------------ ------------ ------------ ------------- -------------"
   fi
   echo $eth $sumbytesin $sumbytesout $sumbytes $sumpacketsin $sumpacketsout $sumpackets |awk '{printf("%9s %11.1d %12.1d %12.1d %12s %13s %13s\n",$1,$2/1024,$3/1024,$4/1024,$5,$6,$7)}'
   inbytesfirst=$inbytesend
   outbytesfirst=$outbytesend
   inpacketsfirst=$inpacketsend
   outpacketsfirst=$outpacketsend
  
   i=$(($i+1))
   sleep $interval"s"
done