I have a Windows batch file that process a bunch of files. As part of this I use the following line:

forfiles /p "%~dpn1%LogDir%" /m "%SupportLog%*" /c "cmd /c logreader.py @file > \"%~dpn1%ParsedLogDir%\@file_Logreader.txt\"

This works OK, but essentially loops through all my files (%SupportLog%*) and passes each one by one into the "logreader.py" script.

What I really want to do is create a list or parameter of all these files and pass all of them at once into the Python script, such the the command that should be run would resemble:

logreader.py "logfile.log" "logfile.log.1" "logfile.log.3" .....

I tried to use the SET command within the forfile command such that:

forfiles /p "%~dpn1%LogDir%" /m "%SupportLog%*" /c "cmd /c set PARAMS=%PARAMS%@file "

However, when run this and leave the ECHO ON, I see:

forfiles /p "C:\Path\log" /m "logfile.log*" /c "cmd /c set PARAMS=@file "

Which is incorrect. And when I "echo %PARAMS%", I get no result.

Is there a way of achieving this?

Many thank


1 Answer 1


Changing environment variables in a child cmd instance (that's what the cmd /c invokes) does not affect environment in the parent cmd process. Next code snippet could help:

SETLOCAL EnableExtensions EnableDelayedExpansion
set "LogDir=%~dpn1log"         my guess only
set "SupportLog=logfile.log"   my guess only
set "PARAMS="                  initial value
rem 1st try for /R "%LogDir%" %%a in ("%SupportLog%*") do set PARAMS=!PARAMS! "%%~a"
rem 2nd try for %%a in ("%LogDir%\%SupportLog%*") do set "PARAMS=!PARAMS! "%%~a""
rem 3rd try
for %%a in ("%LogDir%\%SupportLog%*") do set "PARAMS=!PARAMS! "%%~nxa""
echo logreader.py %PARAMS%

Note that imperative logreader.py is merely echoed for debugging purposes.

However, I don't apprehend target of > redirection, sorry...

Resources (required reading):


  • Hi Jose, this is almost perfect, although the the for /r seems to recurse the folder tree. Now, this is OK, the first time I run this batch file as I can set the For loop early in the batch that evaluates the folder before I create a subfolder to store the parsed file, but if I then run the batch again, if picks up file in the sub folder. (sorry for the multiple comments, I couldn't quite get the hang of these ;()
    – Swinster
    Sep 26, 2015 at 17:27
  • Doh. Stupid boy! Just remove the /r and set the SET to the correct directory. Many thanks, all done, from what I can see. Maybe I should start looking at PowerShell to build such things in the future.
    – Swinster
    Sep 26, 2015 at 17:59
  • 1
    For reference, the full line that worked was For %%A in ("%~dpn1%LogDir%\%SupportLog%*") do ( set PARAMS=!PARAMS! "%%A" ). This is used in conjunction with passing a file into the batch file in the first place (via a SentTo short cut)
    – Swinster
    Sep 26, 2015 at 22:11

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