Here, for example, we're calling the MCD function.

例如，我们这里调用 MCD 数。

So you could do something like grep foobar in MCD, it's there.

所以你可以 MCD 中执行 grep foobar 操作，它就那里。

So now for example let's look at MCD and it has the comment that we were looking for.

让我们看看 MCD，它有我们正找评论。

So now it looks like nothing happened, but now the MCD function has been defined in our shell.

所以看起来好像什么也没发生，但 MCD 数已经我们 shell 中定义了。

So we can now for example do MCD test, and now we move from the tools directory to the test directory.

因此，我们可以进行 MCD 测试，我们从工具目录移动到测试目录。

Here we have the MCD function, that has been defined, and the thing is so far, we have just kind of seen how to execute several commands by piping into them, kind of saw that briefly yesterday.

这里我们已经定义了 MCD 数，到目前为止，我们刚刚看到了如何通过管道输入多个命令来执行它们，昨天简单地看到了这一点。