Robert, It sounds like you are doing some really interesting stuff. It also sounds like you might want to be looking for forensic tools already been built for this sort of work.
Alex is right about hashing the file blob to develop a unique identifier for exact matches regardless of name but that also means 'exact'. I'm thinking about an excel spreasheet opened with numbers or googlesheets and resaved. Copy two may be perfectly fine as far as the programs and anything else are concerned but not be 'exact' if a single character was replaced, changed, added or removed anywhere in the file. With image files it's even easier for something to get shifted or changed and those are precisely the kinds of files where surreptitious data are easily hidden. Then we get to the thousands of .dll files on a typical windows machine. These are the sorts of things already worked out and tools built to do them. I think it would be a large wheel to reinvent within 4D. On Mon, Mar 13, 2017 at 11:56 PM, Robert ListMail via 4D_Tech < 4d_tech@lists.4d.com> wrote: > I need a utility that can scan a backup drive (or index) and identify > what’s unique to the backup volume without expecting identical pathnames on > the other drives... So, the routine would have to query (effectively a > Finder Search for each file) all specified drives looking for each file and > reporting those that are missing... Basically, I need to know which data on > this given backup drive is truly unique and therefore potentially valuable. > > Might there be a 4D solution? Have you dealt with large directories or > many directories from the file system? If there is a utility already built > I’m open to that as well. > > Thanks, > > Robert > ********************************************************************** > 4D Internet Users Group (4D iNUG) > FAQ: http://lists.4d.com/faqnug.html > Archive: http://lists.4d.com/archives.html > Options: http://lists.4d.com/mailman/options/4d_tech > Unsub: mailto:4d_tech-unsubscr...@lists.4d.com > ********************************************************************** -- Kirk Brooks San Francisco, CA ======================= ********************************************************************** 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4d.com/archives.html Options: http://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **********************************************************************
