更广泛的命令(例如按单词向前和向后移动)可以通过readline库来控制，该库在缺省情况下同时支持vi和emacs绑定。
More extensive commands, such as going backward and forward by words, are controlled by the Readline library that supports both vi and emacs bindings by default.
一听到我的命令，你就向前跑。
编辑功能意味着您可以在当前显示的命令行中向前和向后移动，以做出更改或纠正输入错误。
The editing functionality means that you can go forward and backward through the command line currently displayed to make changes and correct typos.
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