Windows batch: Reset Variable

Question

I am trying to collect first file from the directory then process the file. But at the second time when the running and processing the batch file I am unable to store the values in the variable for the file name

Below is the sample code:

for /R C:\abcde_efghij\ab_abcabca %%i IN (*.*) DO (
set filename=%%i
 set newname=%filename:~14%
 set transname=%filename:~25%
goto tests
)
:tests
echo %filename%
echo %newname%
echo %transname%

I am sure we have to use something called SETLOCAL but I am unable to make it in the above code.

Any Help!

the famous [delayed expansion trap](http://stackoverflow.com/a/30284028/2152082)... — Stephan, Jun 27 '16 at 08:24

jeb · Accepted Answer · 2016-06-27T09:05:51.070

1

You should avoid percent expansion inside of blocks, also FOR blocks, as the expansion only occours only once when the block is parsed.

for /R C:\abcde_efghij\ab_abcabca %%i IN (*.*) DO (
 set filename=%%i
 goto :tests   # Get only the first file
)
exit /b

:tests
set newname=%filename:~14%
set transname=%filename:~25%
echo %filename%
echo %newname%
echo %transname%
exit /b

As @Stephan noted, you could also use delayed expansion inside blocks.

setlocal EnableDelayedExpansion
for /R C:\abcde_efghij\ab_abcabca %%i IN (*.*) DO (
  set filename=%%i
  set newname=!filename:~14!
  set transname=!filename:~25!

  goto :tests   # Get only the first file
)

edited Jun 27 '16 at 09:05

answered Jun 27 '16 at 08:26

jeb

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for "collect first file", the `goto` is intended to break the loop. – Stephan Jun 27 '16 at 08:36
@Stephan yes. I modified `goto` instead of `call`. Thanks – nawazlj Jun 27 '16 at 08:57
@Stephan You are right, I should read the texts more carefully – jeb Jun 27 '16 at 09:04

Windows batch: Reset Variable

1 Answers1