Batch file - get variable as a string from Windows environment

Question

In Windows system variable I have the following variable

x = 123 Data_123 = ddd:

How do I get this variable as a string from batch filet

So at the end I want to get the variable like "Data"_%x% and I will get the value ddd

How can I do that

Answer 1

you need delayed expansion:

@echo off
setlocal enabledelayedexpansion
set x=123
set data_123=hello
echo !data_%x%!

(there is another method without delayed expansion:

call echo %%data_%x%%%