In windows batch file, re-set variable inside if-else block doesn't work

Question

I've got the code below, try to re-set variable "name" inside an if-else block:

@echo off
set name=kk
echo %name%
if "%name%"=="jj" (
echo case1
) else (
echo case2
set name=ll
echo name=%name%
)

Under cmd of win10, it outputs:

aa
kk
case2
name=kk

This is weird, I wish that my last echo should print:

name=ll

Seems the "set name=ll" didn't work. So would you help to explain why it didn't work as I expected, and how to fix it?

Your set commands are working fine, the issue you're experiencing is with your use of %name%. Possible duplicate of Variables are not behaving as expected — Compo
– Compo, Commented May 3, 2019 at 7:57
if you don't want to enabledelayedexpansion as shown by numerous duplicate questions on SO, then you can use call echo name=%%name%% — user7818749
– user7818749, Commented May 3, 2019 at 8:24

npocmaka · Accepted Answer · 2019-05-03 05:38:37Z

4

You need a delayed expansion

@echo off
setlocal enableDelayedExpansion
set name=kk
echo %name%
if "%name%"=="jj" (
  echo case1
) else (
  echo case2
  set name=ll
  echo name=!name!
)

answered May 3, 2019 at 5:38

npocmaka

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