Hi ,
what i understand from what you wrote ... that you want to check if the files
already exits you won't to copy it again
so you can check that useing
if(-e "location/Filename"){do something }
this will return true whenever a file is exits ... if you want to copy
whenever a file isn't exits use it like this
if(!-e "location/Filename"){ do something}
this will do what you want like copying whenever a file is not exits ...
i hope i got what you're looking for
bye
On Thu, 17 Feb 2005 11:27:46 +0000, Ken Gillett <[EMAIL PROTECTED]> wrote:
> I have a problem that is not exactly a perl problem, but I do have to
> implement it in perl, although the implementation is not the problem.
> Sorry if that's a bit obscure.
>
> I have thousands ( <50,000 ) of numerically named files that I need to
> store in 2 different location so that the ratio of numbers of files in
> each location is maintained at a preset ratio. The files will be
> repeatedly created and I want to ensure that each time this is done,
> the same named file is placed in the same location it was last time,
> therefore a simple alternating process or one that looks at the
> existing numbers of files would not be suitable, since at each
> generation of the files they would be unlikely to end up in the same
> place.
>
> So I really want something that examines the file name and makes a
> decision based on that, so that every time it sees the same name, it
> will be placed in the same location - unless there's another way to
> enforce the same rule?
>
> The file names are numbers between 10 and 10,000,000, with no
> grouping/order to the naming that would skew the result - assume an
> even distribution.
>
> Initially the storage requirements are 2:1, so simply dividing the name
> by 3 would (I think) work, i.e. if the name is exactly divisible by 3
> or not could determine in which location to place it. But if I need to
> change that to e.g. 3:2 it's not so simple and the ratio needs to be
> flexible so that it can be easily set and/or changed for different
> setups.
>
> BTW, the background to this is that the list of files will be symlinks
> to (currently mostly mp3) music files and a larger number of far
> smaller supporting regular files (mostly text, some binary). The entire
> structure is to be created on the main server then rsync'd up to a
> player device which has 2 HDs for the storage, hence the 2 different
> locations and the need to ensure the files are in the same location
> every time, otherwise rsync will waste a lot of time deleting and
> re-copying files simply because they're in a different directory from
> last time and when playing with almost 100Gb of data this is to be
> avoided at all costs.
>
> Hope some of you can bring some brain power to work on this as my head
> hurts...
>
> Ken G i l l e t t
>
> _/_/_/_/_/_/_/_/_/
>
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