So it turns out there's a program called sleep, just like there's a program called Nano, a program called GCC -- that is not what I want.

所以结果这个有一个sleep程序，就像这个有个叫做Nano的程序，一个叫做GCC的程序--那不是我想要的。

哈佛公开课 - 计算机科学课程节选