Java 用于向上、向下、向左和向右箭头的“ASCII”代码
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"ASCII" codes for arrow up, down, left and right
提问by Tk421
I am writing a program that reads input from Javascript and send those readings to bash.
我正在编写一个从 Javascript 读取输入并将这些读数发送到 bash 的程序。
I can successfully run many actions, like "A-Z" letters, TAB, CTRL+C, etc. But I realize that I cannot send properly to bash the ARROW UP.
我可以成功运行许多操作，例如“AZ”字母、TAB、CTRL+C 等。但我意识到我无法正确发送来敲击 ARROW UP。
If I read the ascii code from Javascript, I get the following as explained Binding arrow keys in JS/jQuery
如果我从 Javascript 中读取 ascii 代码，我会得到以下解释JS/jQuery 中的绑定箭头键
37 - left
38 - up
39 - right
40 - down
However, when I send arrow up to the terminal, decimal key code 38, I write an ampersand (as by following a ascii table http://www.asciitable.com/)
但是，当我将箭头向上发送到终端时，十进制键代码 38，我写了一个＆符号（如遵循 ascii 表http://www.asciitable.com/）
So, my question is: what code do I have to send from Java to bash to tell bash "arrow key up" ?
所以，我的问题是：我必须从 Java 向 bash 发送什么代码才能告诉 bash“向上箭头”？
PD_ I realize that it might be different depending on the operating system and this code might not be considered an ascii code as this post suggest: enter link description here
PD_ 我意识到它可能因操作系统而异，并且此代码可能不被视为 ascii 代码，因为本文建议：在此处输入链接描述
EditI write from Java to bash by using the following code:
编辑我使用以下代码从 Java 写入 bash：
JSch jsch = new JSch();
[...]
Channel channel = session.openChannel("shell");
OutputStream out = channel.getOutputStream();
out.write(asciiDecimalCode); // send characters
Thanks in advance.
提前致谢。
采纳答案by Aaron Digulla
The escape sequence for "Arrow up" is "\u001b[A". \u001bis the code for ESC (Escape).
“向上箭头”的转义序列是"\u001b[A". \u001b是ESC (Escape)的代码。
That means while you have a single key code in JavaScript, you need to write 3 bytes to BASH to achieve the desired effect.
这意味着当你在 JavaScript 中有一个单一的关键代码时，你需要向 BASH 写入 3 个字节才能达到预期的效果。
You can see it for yourself by typing Ctrl+VUp.
您可以通过键入 来亲自查看Ctrl+VUp。
The Ctrl+Vtells bash: "Don't try to interpret the next input; just insert it verbatim".
该Ctrl+V是告诉bash：“不要试图解释下一个输入，只需将其插入逐字”。
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