在Bash中预先填写提示 [英] Pre-filling a prompt in Bash

问题描述

写一个bash脚本，我想得到用户输入.太棒了，

Writing a bash script, and I want to get user input. Awesome,

read -p "What directory should we save in? " -e FOLDER

除了我想做的，理想，是让用户看到类似以下内容的东西:

Except that what I'd like to do, ideally, is have the user see something like:

What directory should we save in? /home/user/default/

，光标位于行尾，并具有向后删除或追加或其他功能.本质上，是预先填充用户的输入，但使他们能够对其进行编辑.

with the cursor at the end of the line, and the ability to delete backwards or append or whatever. Essentially, pre-filling the user's input, but giving them the ability to edit it.

Readline显然具有此功能，但是它似乎没有在read命令中公开.还有其他选择吗?我希望不必使用perl或类似的东西.

Readline obviously has the capability, but it appears to be not exposed in the read command. Any alternatives? I'd prefer to not have to use perl or such.

我要处理的约束是我正在编写一个易于广泛传播的shell脚本，因此应尽可能少地使用现有的基础结构. rlwrap和read -i都可以工作，如果它们的依赖项(分别为rlwrap和bash版本>>)可用，则 可用.两者都是好的答案，请选择最适合您的.

The constraint I'm working under is that I'm writing a single shell script that would be nice to disseminate widely, so should rely on as little pre-existing infrastructure as possible. rlwrap and read -i both work if their dependencies (rlwrap and bash version >> whatever I have, respectively) are available. Both good answers, choose whichever works for you.

推荐答案

您可以将命令包装在rlwrap中，该命令提供即时读取功能:

You can wrap the command in rlwrap, which provides instant readline capabilities: http://utopia.knoware.nl/~hlub/rlwrap/#rlwrap

(rlwrap -P完成您想要的操作)

(rlwrap -P does what you want)

就3.2行(我想您正在使用的)而言，纯bash解决方案是可行的，我不认为

As far as a pure bash solution is concerned for the 3.2 line (which i am presuming you are using), I dont think its possible

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