Batch files variables
How to pass variables between dos batch files
I spend a couple of hours today figuring out how to get the result from a DOS batch as a variable in another DOS batch file. I.e. you have a batch file A which calls another batch file B, which return sa variable you can use in bath file A.
Here is the solution I came up with:
My original called batch file calculated yesterdays date. I've been using a slightly modified version of Yesterday.bat from Rob van der Woude's Scripting Pages..
To keep this example simple I'll simulate the result of the called batch file with a simple file as:
set yesterday = 20-01-2006
:: Copy the output from executing another batch file into a variable
:: Execute outputVariable.bat and store batch files result in
:: variable yesterday
@FOR /F "tokens=*" %%i IN ('outputVariable.bat') DO set yesterday=%%i
If you run readVariableFromOutput.bat it will show the value of %yesterday% which is now available for further processing. That's all there is too it.
If you are looking to pass a variable the other way. I.e. you have a batch file and want to call another batch file passing a variable instead of getting the returned value. Here is how to do that:
set vara="Hello There"
echo Variables set in caller.bat:
echo Calling passTo.bat
call passTo.bat %vara% %varb%
echo Inside passTo.bat
echo vara: %vara%
echo varb: %varb%
Avoid using any spaces in the code to set the variables:
does not work.
I haven't looked into the possibilies of passing variables back and forth, but that can be easy figured out from these two examples.
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