Using A Batch File To Rename Text Files

I have a scenario whereby an Oracle application I developed generates a text file output. This output must reside in a seprate directory on daily basis such that yesterday’s output file must have a different name than today’s file.
I have another program which generates a unique filename (a text string) and writes it to another text file.
My problem is how to use a redirection symbol in a DOS batch file to pick this unique filename to automatically rename my output file everyday.