Question

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Random variable not changing in “for” loop in windows batch file

I have text file with list of files I want to rename. This is my code:

for /f %%i in (tmp.txt) do set script_name=%%i & ren %script_name% %script_name:~0,9%%num%%script_name:~15,9%.sql

But in second part it takes %script_name% only in the first iteration of the loop. So

ren %script_name% %script_name:~0,9%%num%%script_name:~15,9%.sql

always do the same.

Please help to fix that.

Answer 1

Look at set /? and then explore delayed environment expansion. You would first

SETLOCAL ENABLEDELAYEDEXPANSION
(look at setlocal /? as well) and then wrap variables in ren with !’s rather than %’s. I would also use && concatenating the commands, so the first one completes before the second one starts.