Linux下Shell腳本獲取網絡信息

在linux的網絡編程中，經常需要用到網絡信息如：ip、gateway、dns等。以下腳本實現了獲取網絡信息的功能，包括ip、broadcast、netmask、gateway以及dns的信息。

1. #! /bin/sh
   
2. 
   
3. default_route=$(ip route show)
   
4. default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n 1)
   
5. address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')
   
6.   
   
7. #ip address
   
8. ip=$(echo $address | awk '{print $1 }')
   
9. ip=${ip%%/*}
   
10.   
    
11. #broadcast
    
12. broadcast=$(echo $address | awk '{print $2 }')
    
13.   
    
14. #mask address
    
15. mask=$(route -n |grep 'U[ \t]' | head -n 1 | awk '{print $3}')
    
16.   
    
17. #gateway address
    
18. gateway=$(route -n | grep 'UG[ \t]' | awk '{print $2}')
    
19.   
    
20. #dns
    
21. dns=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}')
    
22.   
    
23. echo ip:$ip,mask:$mask,broadcast:$broadcast,gateway:$gateway,dns:$dns