如何删除在bash字符读-d多行文本输入？ [英] How to delete a character in bash read -d multiline input?

问题描述

我正在写将使用bash脚本的的readline 输入查询的同时命令捕捉用户的多行输入（包列表），但我无法弄清楚如何删除（反斜杠）字符的文本（让我们假设我犯了一个错误）。下面是code我暗示的一部分。

I'm writing a bash script that will use readline command to catch user's multiline input (list of packages), but I can't figure out how to delete (backslash) characters while inputing text (let's suppose I made a mistake). Below is the part of the code I'm implying.

read -d `echo -e "\e"` -p $'Give me a list:\n' PACKAGES

\\ e是转义字符退出多行文本输入。在这里，我得到了什么，当我尝试删除字符（我尝试了所有我知道的方法：ALT +反斜杠，Ctrl + W;按Ctrl + U）：

\e is the escape character to exit multiline input. Here what I got when I try to delete a character (I did tried all the methods I know: alt+backslash,ctrl+w;ctrl+u):

# read -d `echo -e "\e"` -p $'Give me a list:\n' vPACKAGES
Give me a list:
line one
line two
line 3^H^W^U^H^

正如你所看到的^ H反斜线怎么PTED，^ W = Ctrl + W不及物动词$ P $，所以我无法删除任何字符只的逃跑的逃脱。我也试图与读标志玩，-e让我删除字符，但输入的变得不再是线路断路器。

As you can see ^H is how backslash was intrpreted, ^W =ctrl+w, so I'm unable to delete the any character only escape with escape. I did tried to play with read flags, -e letting me delete characters but enter becomes no longer a line breaker.

感谢您提前为您的建议和帮助。

Thank you in advance for your advices and help.

推荐答案

我不会做这这样的。我只想提示输入值在一个循环，直到你得到一个空项或其他一些分隔符。

I wouldn't do this this way at all. I would just prompt for values in a loop until you get an empty entry or some other delimiter.

像这样（未经）：

pkgs=()
printf 'Give me a list:\n'
while read -e pkg; [ -n "$pkg" ]; do
    # Validate package, etc., etc.
    pkgs+=("$pkg")
done
# Use `${pkgs[@]}` ...

您可以使用任何其他的测试，而不是 [-n$ PKG] 如果你有一些其他终端进入。 （例如： [$ PKG=。] 来测试一个。等）

You can use any other test instead of [ -n "$pkg" ] if you have some other terminating entry. (e.g. [ "$pkg" = "." ] to test for a ., etc.)

或者，正如格伦·杰克曼正确添加，使用bash的更新（4.0+）版本，新的 readarray 内置这里可以使用这样的：

Or, as glenn jackman correctly adds, with newer (4.0+) versions of bash the new readarray builtin can be used here something like this:

printf 'Enter package names, one per line: hit Ctrl-D on a blank line to stop\n'
readarray -t pkgs

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