shell scripting- monitor error packets on a network interface

ivyharry

1. 
   
2. stp=3
   
3. until [ $stp = 0 ]
   
4. do
   
5. ifconfig eth1 | sed -n '2p;5p;6p;8p' >> log
   
6. 
   
7. p1=$(tail -11 log | sed -n '4p' | awk '{print $6}' | awk -F: '{print $2}')
   
8. p2=$(tail log | sed -n '10p' | awk '{print $6}' | awk -F: '{print $2}')
   
9. 
   
10. p3=$((($p2 - $p1)/2))
    
11. echo $p3 "bytes per-second downloading" >> log
    
12. 
    
13. 
    
14. date >> log
    
15. echo '-------------------------------------------------------' >> log
    
16. tail -7 log
    
17. sleep 2
    
18. done
    

复制代码

this script monitors a NIC on the computer, refreshes every 2 sec. write the resualt into a log file with time appended
it also caculated the download speed in the last 2 sec of the computer

it is a very simple script
any comments about make it better or more useful?

thanks

yongjian

Post by ivyharry

1. 
   
2. stp=3
   
3. until [ $stp = 0 ]
   
4. do
   
5. ifconfig eth1 | sed -n '2p;5p;6p;8p' >> log
   
6. 
   
7. p1=$(tail -11 log | sed -n '4p' | awk '{print $6}' | awk -F: '{print $2}')
   
8. p2=$(tail log | sed -n '10p' | awk '{print $6}' | awk -F: '{print $2}')
   
9. 
   
10. p3=$((($p2 - $p1)/2))
    
11. echo $p3 "bytes per-second downloading" >> log
    
12. 
    
13. 
    
14. date >> log
    
15. echo '-------------------------------------------------------' >> log
    
16. tail -7 log
    
17. sleep 2
    
18. done
    

复制代码

this script monitors a NIC on the computer, refreshes every 2 sec. write the resualt into a log file with time appended
it also caculated the download speed in the last 2 sec of the computer

it is a very simple script
any comments about make it better or more useful?

thanks

1. 
   
2. ifconfig if_name|grep "TX bytes" | awk -F: '{print $3}' | awk '{print $1}'
   

复制代码

The above can catch the bytes too. Would it be easier? Also, its not necessary to put everything to the log file, the whole procedure can be done in memory.

ivyharry

thx for replying
think your way is better than mine
actually faster

and , yea..i am also considering what should go into the log file
this log file will be 18MB if u run this script for one whole day
so what u think will be useful for an admin to monitor the NIC?

thanks

晨想

Have a look at RRD.
http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/
It seems to be able to save some space.