-=PCTechTalk=- Re: File manager
- From: "Don101" <don101@xxxxxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Wed, 24 Sep 2008 21:48:31 -0400
OK. Now it is time to learn a bit about CRC. IIRC it means Cyclic
Redundancy Check. I just went to Wikipedia and I did recall
correctly. It also tells me it is relatively easy to edit a document
and end up with the same CRC. I think this would need to be an
intentional act and an accidental one would be a very rare
coincidence. However, if you change only a 12 character string to
another 12 character string would the coincidence level not drop to a
more believable level of coincidence?
Other than that using the CRC seems like an excellent way to determine
identical files. Especially if they were created by simply copying a
file from one location to another.
Don
----- Original Message -----
From: "Gman" <gman.pctt@xxxxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Wednesday, September 24, 2008 9:19 PM
Subject: -=PCTechTalk=- Re: File manager
> Unless IYF can check CRC values, I'll give you a 'for instance'
> that'll
> hopefully make it somewhat clearer.
>
>
> I have numerous text-based files that get frequent updates and
> they're not
> all in the same location. To make the example more specific, I use
> one of
> them for storing sensitive info related to groups I own &/or
> moderate. When
> I make changes to it, the overall size doesn't always change
> (replace an
> older 12 character password with a new one and the file size will
> still
> remain the same). The access date changes, but I cannot afford to
> trust
> that date as my only indicator because there are other factors that
> can also
> change that date stamp. This means I'm going to have to peek inside
> those
> text files that are not exact duplicates. Using a utility that
> definitively
> removes all of the exact duplicates from the process will limit my
> time to
> dealing only with those files that are not true duplicates. If I
> were to
> reply solely on IYF, I'd find a TON of files that were the same
> size, but I
> would have no idea which ones might contain slight, but very
> important,
> differences.
>
> By no means am I interested in discounting IYF's usefullness for
> many tasks.
> It's just that this procedure, at least for me, requires an app that
> looks
> at the file's CRC value. If Don sees a way to use both ideas to get
> his own
> work done, then that's the way he should use them. :O)
>
> Peace,
> Gman
>
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