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来源：互联网发布：.date 域名编辑：程序博客网时间：2024/04/29 13:28

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#! /bin/bash

typeset in in_old dif_in dif_in1 dif_out1
typeset out out_old dif_out

in_old=$(cat /proc/net/dev | grep eth0 | sed 's/^.*://' | awk '{ print $1 }' )
out_old=$(cat /proc/net/dev | grep eth0 | sed 's/^.*://' | awk '{ print $9 }')

while true
do
         sleep 1
         in=$(cat /proc/net/dev | grep eth0 | sed 's/^.*://' | awk '{ print $1 }')
         out=$(cat /proc/net/dev | grep eth0 | sed 's/^.*://' | awk '{ print $9 }')
         dif_in=$((in-in_old))
         dif_in1=$((dif_in * 8 / 1024 / 1024 ))
         dif_out=$((out-out_old))
         echo " IN: ${dif_in} bytes OUT: ${dif_out} bytes "
         dif_out1=$((dif_out * 8 / 1024 / 1024 ))
         echo "IN: ${dif_in1} mbps OUT: ${dif_out1} mbps"
         in_old=${in}
         out_old=${out}
done

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iftop
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1、sar -n DEV 2 0

sar命令详解：
-n { DEV | EDEV | NFS | NFSD | SOCK | ALL }
Report network statistics.

With the DEV keyword, statistics from the network devices are reported. The
following values are displayed:

IFACE
Name of the network interface for which statistics are reported.

rxpck/s
Total number of packets received per second.

txpck/s
Total number of packets transmitted per second.

rxbyt/s
Total number of bytes received per second.

txbyt/s
Total number of bytes transmitted per second.

rxcmp/s
Number of compressed packets received per second (for cslip etc.).

txcmp/s
Number of compressed packets transmitted per second.

rxmcst/s
Number of multicast packets received per second.

2、watch ifconfig 网卡

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iptraf
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