Contents of variable set from for loop variable substitution refer to previous run in Windows batch script -

if code saved file tst.bat:

@echo off %%a in (%1) (     echo "%%~fa"     set b=%%~fa     echo "%b%" ) 

and invoked twice follows, i'd expect this:

c:\windows\temp>tst.bat abc "c:\windows\temp\abc" "c:\windows\temp\abc"  c:\windows\temp>tst.bat xyz "c:\windows\temp\xyz" "c:\windows\temp\xyz" 

but instead, this:

c:\windows\temp>tst.bat abc "c:\windows\temp\abc" ""  c:\windows\temp>tst.bat xyz "c:\windows\temp\xyz" "c:\windows\temp\abc" 

do have wrong expectations?

once upon time, wrote great intro answer i'm give, can't find it. basically, if want have variables inside for loop update loop, need use delayedexpansion.

@echo off setlocal enabledelayedexpansion %%a in (%1) (     echo "%%~fa"     set b=%%~fa     echo "!b!" )