Keeping track of the files that you have changed that are ready to be uploaded to your web site is not difficult. All you need to do is to sort the list displayed in your FTP program into order based on when each file was last updated. By ordering them so that the last updates [...]

The mainframe sort utility program can do a lot more than just sort the records in your file. It can also be used to test for and remove duplicates.
Removing Duplicates Using DFSORT