Does a program exist for checking two similar directories for file differences? [closed]

Question

Is there a program to compare one folder and all subfolders to another folder and all subfolders for differences in the files contained therein (presence, absence of files, size and list of filenames)?

Example of usage: I have 100 DLL files from environment 1 and I want to check if any of them are different (in size and date modified) from the 100 DLL files in environment 2. So I copy and paste all the DLLs in environment 1 into directory A, and all the DLLs in environment 2 into directory B.

I then run my "directory comparison" program on directories A and B and find out that, aha, here is a list of 7 DLLs that have different modified dates and times between the two directories.

EDIT: OS is windows XP

Answer 1

I'm pretty fond of DiffMerge.

Answer 2

Beyond Compare http://www.scootersoftware.com/