Documentation on the original student project outline
http://mindprod.com/projects/untouchproj.html
This explains how it works and some of its uses.

Untouch supports the the following command line switches which appear
before the directories.
-f or -force = revert files back to previous dates whether they have changed or not.
-s or -sub or -subdir or -subdirs = process files in subdirectories as well.
-l or -log = create untouch.log files in each directory logging what was done.
-q or -quiet = suppress progress messages.