#include <stdio.h>

int main()
{
   
   FILE *cmd=popen("arp kcsdev | awk '{print $4}'", "r");
   char tmp[80]={0x0};
   
   while(fgets( tmp, sizeof(tmp), cmd)!=NULL)
   {
         printf("%s\n", tmp);
    }
   pclose(cmd);
   return 0;
}