I need a fast tool that will tell me the difference between 2 csv files and output a new csv file of those items.

Every hour I create a csv file with the latest prices etc, any changes this has to the master csv file should be output to a new csv file. This new csv file should only contain the changes to the master file.

I would like it to be an exe file where I can input the name of the master file, input the name of the comparison file then when it has found the changes it will automatically save the update file. The names of these files will always be the same but the columns may differ.

This will be an automated process so I will need to pass the names of the csv files as variables through ColdFusion.