Linux中軟連結，硬連結

推薦：https://www.ibm.com/developerworks/cn/linux/l-cn-hardandsymb-links/index.html

其他參考

https://www.cnblogs.com/yfanqiu/archive/2012/06/11/2545556.html

https://blog.csdn.net/buzi2013/article/details/85265883