有2個C生成的文件，需要在開機的時候啓動。
按如下方式添加，只能啓動第一個
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.
./etc/nnn1
./etc/nnn2
exit 0
然後修改成如下，也是隻能啓動前面一個
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.
cd /etc
./nnn1
cd /etc
./nnn2
exit 0
多次對比測試，發現，這兩個程序都是涉及到通信，不返還的，就是不終止程序，一旦啓動就一直在運行，相當於不能退出了，所以後面的語句就無法執行了
於是採用瞭如下方式：
int main(void)
{
int i;
if ( fork() == 0 )
{
/* 子進程程序 */
system("cd /etc");
system("./nnn1");
}
else
{
system("cd /etc");
system("./nnn2");
}
}
相當於多線程運行，然後生成了一個運行文件，nnn3,在rc.loacl中添加如下：
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.
chmod 777 /etc/nnn3
cd /etc
./nnn3
exit 0
開機可以同時2個程序都運行了