Windows批处理命令嵌套变量 [英] windows batch command nested variable

问题描述

我需要使用嵌套变量基于环境变量创建文件夹.

I have a requirement to use nested variables for creating a folder based on a environment variables.

假设我下面列出了变量:

Assume I have variables listed below:

%ABC_ASIA_LOCATION% 
%ABC_EUROPE_LOCATION%
%ABC_US_LOCATION%

，我想将国家作为变量传递给%ABC_%COUNTRY%_LOCATION%.

and I want to pass the country as variable like %ABC_%COUNTRY%_LOCATION%.

如何在Windows中使用批处理脚本实现此目的?

How do I achieve this in Windows utilizing batch scripting?

推荐答案

您必须将每个变量包含在%中:

you have to enclose each variable into %:

set "ABC=ABC"
set "COUNTRY=EUROPE
set "LOCATION=MUNICH
echo %ABC%_%COUNTRY%_%LOCATION%

结果:ABC_EUROPE_MUNICH

或者，如果您只想将Country作为变量，请保持其余部分不变:

Or if you just want Country as a variable, keeping the rest fixed:

echo ABC_%COUNTRY%_LOCATION

结果:ABC_EUROPE_LOCATION

或者如果您希望整个事情都是一个变量(一个变量名称包含另一个变量)，则必须使用延迟扩展:

or if you want the whole thing to be a variable (a variable name containing another variable), you have to use delayed expansion:

setlocal enabledelayedexpansion
set country=EUROPE
set "ABC_EUROPE_LOCATION=a town in southern Germany"
echo !ABC_%country%_LOCATION!

为您提供:a town in southern Germany

注意:setlocal在批处理文件之外没有任何作用，因此延迟扩展仅适用于:
-在批处理文件中
-当命令提示符在启用延迟扩展(cmd /v:on)的情况下启动时(默认情况下，命令提示符在延迟扩展 dis abled下运行)

Note: setlocal has no effect outside of batchfiles, so delayed expansion works only:
- in batchfiles
- when the command prompt was started with delayed expansion enabled (cmd /v:on) (by default, the command prompt runs with delayed expansion disabled)

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