I need a batch file to change one line of text in one directory to the same text file in a different directory

Question

Basically, I have a text file with one line of text SetNumber=01 in 5 folders

C:\Documents and Settings\User\Desktop\Test\test.txt
C:\Folder\Test\test.txt
C:\Test\test.txt 
etc.  

I need to change this SetNumber=01 to different numbers monthly, for instance SetNumber=01 to SetNumber=02 , in all these folders, and would like to run a batch file that would copy and replace this line of text from

C:\Documents and Settings\User\Desktop\Test\test.txt 

into

C:Folder\Test\test.txt. 
etc. 

Any help would be greatly appreciated!!

Answer 1

OK, here we go. This copies the file C:\\Documents and Settings\\User\\Desktop\\Test\\test.txt to all ..\\test\\test.txt files on the current volume (they were erased ). Remove the echo command, if the output is OK:

@echo off&setlocal enabledelayedexpansion
set "sourcefile=C:\Documents and Settings\User\Desktop\Test\test.txt"
for /f "delims=" %%i in ('dir /s /b /a-d \test.txt') do (
    set "fpath=%%~fi"
    if "!fpath:*test\test.txt=!"=="" if not "%sourcefile%"=="%%~fi" (
        echo copy "%sourcefile%" "%%~fi"
    )
)

Answer 2

The Batch file below change all files named test.txt in any folder in the disk by inserting this line "SetNumber=%1":

@echo off
for /R \ %%a in (test.txt) do echo SetNumber=%1> "%%a"

For example, if previous Batch file is called SetNumber.bat, you may change all the files to SetNumber=02 with this command:

setnumber=02

Antonio