It says hello, Brian tilde slash dollar sign.

上面写着你好，布莱恩·蒂尔德。

The tilde just means my so-called home directory.

波浪号的意思是我所谓的主目录。

That's what tilde represents in shorthand notation.

这就是tilde用速记法表示的。

Like, for example, the tilde command changes the case of the character, or the selection that you've currently selected.

例如，波形符命令会更改字符的大小写或您当前选择的选项。

So for example, I can take this, like, Visual Studio Code, and flip the case on the whole thing, by selecting it and pressing tilde.

例如，我可以采用 Visual Studio Code 之类的方法，通过选择它并按波浪号来翻转整个内容的大小写。