awk 獲取MAC、IP信息

首先執行：ifconfig eth0
查看當前網絡信息：

eth0      Link encap:Ethernet  HWaddr b0:83:fe:da:2f:41  
          inet addr:192.168.100.181  Bcast:192.168.100.255  Mask:255.255.255.0
          inet6 addr: fe80::b283:feff:feda:2341/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:96451 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16208 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:11740051 (11.7 MB)  TX bytes:8021609 (8.0 MB)
          Interrupt:35 

獲取MAC地址：

ifconfig eth0 | awk '/HWaddr/ {print $5}'

b0:83:fe:da:2f:41

獲取本地IP地址：

ifconfig eth0 | awk '/inet addr/{print substr($2,6)}'

192.168.100.181

獲取廣播地址：

ifconfig eth0 | awk '/Bcast/{print substr($3,7)}'

192.168.100.255

實際代碼應用，可以使用popen函數，獲取結果：

FILE *fconf;
char cmdline[256];

memset(cmdline,0,256);
sprintf(cmdline,"ifconfig eth0 | awk '/HWaddr/ {print $5}'");
fconf=popen(cmdline,"r");
if(fconf!=NULL)
{
    memset(cmdline,0,256);
    if(fgets(cmdline,20, fconf) != NULL)
    {
        pclose(fconf);
        fconf=0;
        if(strlen(cmdline)>0)
        {
            cmdline[strlen(cmdline)-1]='\0';
            printf("HWaddr: %s\r\n",cmdline);
        }
    }
}