How to manipulate environment variables in parent process?

Is it possible to write a perl script to manipulate the environment
variables in a windows CMD.EXE shell?



Normally, you can manipulate environment variables, but they only have
effect for sub processes. I need to change the values of environment
variables for the parent process.



I have a windows bat file and everyday I have to edit it to contain the
current date (because I have a batch job that creates a new directory with
the current date in the directory name).



Can perl help?



I think the best I could hope for would be to write a perl script that
generated a bat file and then I manually execute the bat file. I don't think
there is anyway to automate the execution of the bat file. Please tell me
I'm wrong!



Thanks,

Siegfried



PS.

The bat file just contains a lot of windows cmd.exe set commands.

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