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Number   :  326
Date     :  2001-07-05
Author   :  Julio Fernandes
Subject  :  Re: /DB:xxM switch
Size(KB) :  3



Kan,

Yep, now it works great, i had not quite
figuered out that midnight problem but now i 
understand.
Btw the link to the new v.2.57.0 beta on
yahoogroups:

http://groups.yahoo.com/group/xxcopy/files/xxfw2570.zip

,is kind of strange. I downloaded it and got some
skin ... , but the one on xxcopy site is Ok.

Thanxs alot for your atention.

Julio


Cópia Kan Yabumoto :

> 
> Julio:
> 
> You are absolutely correct. XXCOPY's /DB#
> switch was not doing exactly
> what it was supposed to do. It had a bug which
> behaved a little funny.
> The bug was introduced when we added a suffix
> letter which allows you to 
> specify the age by not only by the days but
> also by hours, minutes or
> even seconds. That was mid February (v.2.55.0)
> 
> This bug was only with /DB#, not with /DA#. 
> Also, this bug affects the
> age value you specify in non-day value (hrs,
> min, or sec).
> 
> If you examine the way /DB# switch counts the
> file age by days, you
> will know why and you could even use the
> "broken" /DB# switch.
> 
> That is, when you say /DB#0 (0 means today and
> it's inclusive),
> it includes files that are made all day today. 
> That is, the
> cut-off point was made at midnight tomorrow. 
> Yes, the future
> time is the reference point for 0th day. So,
> /DB#1 will be
> interpreted as files that are older than 24
> hours which is
> measured from midnight tomorrow (that is
> today's midnight).
> 
> 
> -----------------------------------------------------
-----------
> Note: I don't really know what is the
> official definition
> of which day a midnight belongs. But, for
> the explanation
> here, I'm using the word Midnight as the
> first moment of a day.
> 
> -----------------------------------------------------
-----------
> 
> So, the /DB# bug added the age by the remaining
> time left for
> today. For example, if you say /DB#10H, that
> should be interpreted
> as 10 hours earlier from now. But, the bug
> made XXCOPY to use the
> value 10 hours plus the remaining hours in
> today (depending on when
> you invoke this command). If you used this at
> Noon today, then,
> you had 12 hours within today and therefore,
> XXCOPY would select
> files that are 22 hours old or older (10 + 12 =
> 22). The same
> thing is true for the age specified by minutes,
> or seconds.
> Anyway, the silly offset made this feature VERY
> DIFFICULT TO USE!!!
> 
> In short, the bug was caused by forgetting the
> fact we had this
> special midnight-correction added for /DB#
> cases.
> 
> -----------------------------------------------------
-------------
> 
> Well, that is the (unnecessary and boring)
> explanation of this bug.
> Of course, we don't want any of you to use the
> command even
> though you could use it with some compensation
> technique.
> 
> The good news is, the bug is now gone from the
> new version.
> It has already been posted on our web page.
> 
> http://www.xxcopy.com/betatest/ (for
> v.2.57.0)
> 
> If you don't use the /DB# switch, you may defer
> your update
> until the next big thing comes along. But, if
> you have not
> downloaded v.2.56.9, then we suggest to get the
> newest one
> because it fixed several bugs (all are pretty
> minor ones).
> 
> Kan Yabumoto
> 
=======================================================
==========
> At 2001-07-04 05:01, Julio Fernandes wrote:
> > Hi
> > Has anyone noticed that the /DB#xxM
> (in which
> >M is minutes ) swtich variant does not work?
> >
> > I tried to use it this way:
> >
> >xxcopy src dst /S /FC /DB#30M /YY
> >
> >objective: select only files that were created
> more
> >than half an hour ago.
> >
> >result: select all files, even those with 1
> minute
> >creation time
> >
> >
> >Thanxs in advance
> >
> >
> >Julio
> 
> 
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/ 
> 
> 
> 


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