从 Windows 脚本中的命名环境变量中删除引号
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Remove quotes from named environment variables in Windows scripts
提问by Craig Walker
I want to store a URL prefix in an Windows environment variable. The ampersands in the query string makes this troublesome though.
我想在 Windows 环境变量中存储 URL 前缀。查询字符串中的 & 符号使这很麻烦。
For example: I have a URL prefix of http://example.com?foo=1&bar=and want to create a full URL by providing a value for the barparameter. I then want to launch that URL using the "start" command.
例如：我有一个 URL 前缀，http://example.com?foo=1&bar=并希望通过为bar参数提供一个值来创建一个完整的 URL 。然后我想使用“开始”命令启动该 URL。
Adding quotes around the value for the SET operation is easy enough:
在 SET 操作的值周围添加引号非常简单：
set myvar="http://example.com?foo=1&bar="
Windows includes the quotes in the actual value though (thanks Windows!):
Windows 在实际值中包含引号（感谢 Windows！）：
echo %myvar%
"http://example.com?foo=1&bar=true"
I know that I can strip quotes away from batch file arguments by using tilde:
我知道我可以使用波浪号从批处理文件参数中去除引号：
echo %~1
However, I can't seem to do it to named variables:
但是，我似乎无法对命名变量执行此操作：
echo %~myvar%
%~myvar%
What's the syntax for accomplishing this?
完成此操作的语法是什么？
采纳答案by zdan
This is not a limitation of the environment variable, but rather the command shell.
这不是环境变量的限制，而是命令外壳的限制。
Enclose the entire assignment in quotes:
将整个作业用引号括起来：
set "myvar=http://example.com?foo=1&bar="
Though if you try to echo this, it will complain as the shell will see a break in there.
但是，如果您尝试回显这一点，它会抱怨，因为 shell 会在那里看到中断。
You can echo it by enclosing the var name in quotes:
您可以通过将 var 名称括在引号中来回显它：
echo "%myvar%"
Or better, just use the set command to view the contents:
或者更好，只需使用 set 命令查看内容：
set myvar
回答by Craig Walker
echo %myvar:"=%
回声 %myvar:"=%
回答by jimhark
While there are several good answers already, another way to remove quotes is to use a simple subroutine:
虽然已经有几个很好的答案，但另一种删除引号的方法是使用一个简单的子例程：
:unquote
set %1=%~2
goto :EOF
Here's a complete usage example:
这是一个完整的使用示例：
@echo off
setlocal ENABLEDELAYEDEXPANSION ENABLEEXTENSIONS
set words="Two words"
call :unquote words %words%
echo %words%
set quoted="Now is the time"
call :unquote unquoted %quoted%
echo %unquoted%
set word=NoQuoteTest
call :unquote word %word%
echo %word%
goto :EOF
:unquote
set %1=%~2
goto :EOF
回答by Chris
This works
这有效
for %a in (%myvar%) do set myvar=%~a
I would also use this if I wanted to print a variable that contained and ampersand without the quotes.
如果我想打印一个包含和符号而不带引号的变量，我也会使用它。
for %a in ("fish & chips") do echo %~a
回答by Keith
To remove only beginning and ending quotes from a variable:
要仅从变量中删除开头和结尾的引号：
SET myvar=###%myvar%###
SET myvar=%myvar:"###=%
SET myvar=%myvar:###"=%
SET myvar=%myvar:###=%
This assumes you don't have a ###" or "### inside your value, and does not work if the variable is NULL.
这假设您的值中没有 ###" 或 "###，并且如果变量为 NULL，则不起作用。
Credit goes to http://ss64.com/nt/syntax-esc.htmlfor this method.
此方法的功劳转到http://ss64.com/nt/syntax-esc.html。
回答by Christian d'Heureuse
Use delayed environment variable expansion and use !var:~1,-1! to remove the quotes:
使用延迟环境变量扩展并使用 !var:~1,-1! 删除引号：
@echo off
setlocal enabledelayedexpansion
set myvar="http://example.com?foo=1&bar="
set myvarWithoutQuotes=!myvar:~1,-1!
echo !myvarWithoutQuotes!
回答by CmdCrazy
Use multiple variables to do it:
使用多个变量来做到这一点：
set myvar="http://example.com?foo=1&bar="
set bar=true
set launch=%testvar:,-1%%bar%"
start iexplore %launch%
回答by Amr Ali
@echo off
set "myvar=http://example.com?foo=1&bar="
setlocal EnableDelayedExpansion
echo !myvar!
This is because the variable contains special shell characters.
这是因为该变量包含特殊的 shell 字符。
回答by wimh
I think this should do it:
我认为应该这样做：
for /f "tokens=*" %i in (%myvar%) do set %myvar%=%~i
But you do not need this,
但你不需要这个，
set myvar="http://example.com?foo=1&bar="
start "" %myvar%
Will work too, you just need to supply a title to the start command.
也可以工作，您只需要为 start 命令提供一个标题。
