Documentation on the original student project outline mindprod.com/projects/whichproj.html This explains how it works and some of its uses. Which supports the following command line switches which appear before the directories. -c or -clear = clear history first and take current file times as the new revert-to point. -f or -force = revert files back to previous dates whether they have changed or not. -h or -help = display help on Which syntax. -r or -remove = remove option to remove which history i.e. which.digest and which.log files -s or -sub or -subdir or -subdirs = process files in subdirectories as well. -l or -log = create which.log files in each directory logging what was done. -q or -quiet = suppress progress messages. Native Windows Jet executable also available.