How to view Linux network port traffic

The rapid development of Linux has caught up with Microsoft in just a short time, So Microsoft has paid attention to this opponent. Maybe you are learning Linux. Here we will explain how to check the script of Linux network port traffic, I hope to learn how to view the Linux network port traffic script. Through this script, we found that bash is indeed more powerful than the old shell in arithmetic operations. Therefore, we need to start learning bash to use its powerful functions. However, the for statement function in bash differs significantly from that in c.

 
 

  
  
# Cat stream
  
  
 
  
  
#! /Bin/bash
  
  
# Write by Neil. xu qq: 37391319 email: xurongzhong@gmail.com
  
  
#2008-8-19 we need to monitor streams of LTS channels, so write this
  
  
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
  
  
 
  
  
Running effect:
  
  
#./Stream
  
  
IN: 349179 bytes OUT: 1363936 bytes
  
  
IN: 2 mbps OUT: 10 mbps
  
  
IN: 349612 bytes OUT: 1361852 bytes
  
  
IN: 2 mbps OUT: 10 mbps
  
  
IN: 348684 bytes OUT: 1358952 bytes
  
  
IN: 2 mbps OUT: 10 mbps
  
  
IN: 349998 bytes OUT: 1359092 bytes
 
 

In this way, you can learn how to view the Linux network port traffic.

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