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

例如，在这里调用 MCD 函数。

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

所以你可以在 MCD 中执行类似 grep foobar 的操作，它就在那里。

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

现在 MCD，它有正在找的评论。

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

所以现在好像什么也没发生，但现在 MCD 函数已经在的 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，现在可以进行 MCD 测试，现在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.

这里已经定义了 MCD 函数，到目前为止，刚刚到了如何通过管道输入多个命令执行它，昨天简单地到了这一点。