how to change existing variable in a configuration file using batch file

Question

I am installing software on a client machine, so I have a configuration file having over 100 variables, so I want to change these variables at run time using batch file.

Here are some of variables for example-

file name: config.asp ...

USPSAccessKey=fsfsfs113bh$dd
USPSUserID=1232445
USPSPassword=#########
USPSServiceCode=PRIORITY
USPSServiceCodeFixed=YES
USPSPackageType=VARIABLE
USPSCustomerClassCode=FLAT

...

So there is any way to read this file and then change variables using batch file

Thanks in advance,

Answer 1

Your question is not clear. If you want to modify config.asp file in order to change certain lines with different values, then you may do this:

@echo off
setlocal EnableDelayedExpansion

rem Define new values of desired variables
set newValue[USPSUserID]=5442321
set newValue[USPSPassword]=$$$$$$$$$

(for /F "tokens=1,2 delims==" %%a in (config.asp) do (
   set "value=%%b"
   if defined newValue[%%a] set value=!newValue[%%a]!
   echo %%a=!value!
)) > newConfig.asp

Answer 2

This should do it.

First read the file with a for loop, then modify some values, then write the variables out using set with redirecting the output. Note: I use config2.asp for the output so you can test if it works first.

@echo off
setlocal enableextensions enabledelayedexpansion

for /f "delims=" %%I in (config.asp) do set "%%I"

:: Set some USPS variables here
::


set USPS > config2.asp