用系統指令 , 抓需要的資料

#include <stdio.h>

int main() {
    FILE *pf;
    char buffer[4096];

    pf = popen("/sbin/ifconfig", "r");
    fread(buffer, sizeof(buffer), 1, pf);

    printf("%s\n", buffer);

    pclose(pf);
    return 0;
}