Filename completion is not a new concept; many shells provide basic forms of completion, such the Bash shell which USES the TAB key, as in the following example.

文件名的完成并不是一个新的概念；许多shell可提供基本的完成格式，例如Bash shell可使用tab键，如下例所示。

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With completion, you can type the start of a filename: zsh$ cd bar.

使用完成功能，您可以输入文件名的开头：zsh$ cd bar。

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