回显退格键

发布于 2024-11-02 12:33:08 字数 200 浏览 0 评论 0原文

是否可以在 bash 中回显退格键？

类似的东西

echo $'stack\b'

不应该输出 stac?或者我错过了什么？

更具体地说，我想将其用于：

ls | wc -l; echo $'\b items'

原文

Is it possible to echo a backspace in bash?

Something like

echo 
Shouldn't output stac? Or I'm missing something?
More specifically, I'd like to use that in:
ls | wc -l; echo 
stack\b'

Shouldn't output stac? Or I'm missing something?
More specifically, I'd like to use that in:

\b items'

stack\b'

Shouldn't output stac? Or I'm missing something?

More specifically, I'd like to use that in:

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甜心 2024-11-09 12:33:08

\b 使光标向左移动，但不会删除该字符。如果要删除则输出一个空格。

对于某些发行版，您可能还需要使用 echo 的 -e 开关：

 -e 启用反斜杠转义的解释

所以它看起来像

 echo -e 'stack\b '

Also, files=(*) ;回显“${#files[@]} 项”。

\b makes the cursor move left, but it does not erase the character. Output a space if you want to erase it.

For some distributions you may also need to use -e switch of echo:

  -e     enable interpretation of backslash escapes

So it will look like

 echo -e 'stack\b '

Also, files=(*) ; echo "${#files[@]} items".

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随梦而飞# 2024-11-09 12:33:08

因此，为了回答有关退格键的实际问题，这将模拟退格键：

echo -e "\b \b"

它将字符向后移动一个，然后回显一个空格，覆盖那里的任何字符，然后再次向后移动 - 实际上删除前一个字符。但它不会返回一行，因此之前的输出不应创建新行：

echo -n "blahh"; echo -e "\b \b"

So to answer the actual question about backspaces this will simulate a backspace:

echo -e "\b \b"

It will move the character back one, then echo a space overwriting whatever character was there, then moving back again - in effect deleting the previous character. It won't go back up a line though so the output before that should not create a new line:

echo -n "blahh"; echo -e "\b \b"

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So尛奶瓶 2024-11-09 12:33:08

这并不完全是您所要求的，而且，在伊格纳西奥的回答中，您可以用于这种情况：

echo "$(ls | wc -l) items"

据我所知，您无法打印删除之前字符的字符，甚至无法打印其十六进制数字对应的字符退格键。不过，您可以后退并打印一个空格来删除。使用cput，您可以执行许多操作并在屏幕上的任意位置进行打印。

It is not exactly what you're asking for, but also, in the line of Ignacio's answer, you could use for this case:

echo "$(ls | wc -l) items"

AFAIK you cannot print a character that deletes the one before, not even printing the char whose hexadecimanl number correspoonds to backspace. You can move back and print a blank space to delete, though. With cput you can do many things and print wherever you want in the screen.

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