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\->Tips and Tricks->Batch Files->Batch File Tips and Tricks->Delayed Expansion (in loops)

Delayed Expansion (in loops)

Delayed expansion is typically not something you'd want to do but something forced on you by the batch language, specifically in how bracketed loops are implemented...

The "ENABLEDELAYEDEXPANSION" bit is required by "Method 1" in the following:

@echo off
SetLocal ENABLEDELAYEDEXPANSION

echo.
echo **** METHOD 1 (needs "ENABLEDELAYEDEXPANSION") *****
set VAR=!!!!!!!!
for /L %%i in (1,1,10) do (
    set VAR=%%i - WORKED
    echo %%i : !VAR!
)

echo.
echo **** METHOD 2 *****
set VAR=!!!!!!!!
for /L %%i in (1,1,10) do call :Loop1 %%i
    goto Next-Loop1
    :Loop1
    set VAR=%1 - WORKED
    echo %1 : %VAR%
    goto :EOF
:Next-Loop1


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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.