Re: [Dirssync-opendisc] comparaison : md5sum

[vincent d. <vin...@ya...>]

--- Mark Carter <xs...@uk...> wrote:
> --- vincent delft <vin...@ya...> wrote:
> 
> > Can you give me more details about MD5sum checks ?
> 
> It's just a checksum - a number derived from the
> contents of the file, like a fingerprint. The good
> thing about it is that you can tell if 2 files are
> different just by looking at their checksum
> 
> > Doing such check will show you a difference when
> one
> > of the file has been updated. My question is which
> one
> > must be synchronized ?
> 
> Offhand, it would not be possible to tell, unless
> you stored the checksum somewhere. For a one-way
> transfer, though, the fact that the checksums are
> different implies that a transfer is required.
> 

Even if I store the checksum somewhere, what's the
added value ?
You will have 2 files and 4 checksums, and then ??
Sorry I don't understand.

For me the main advantage of dirssync is not that he's
comparing files, he's taking decesion to replace one
of the two. 

Checksum will be a way to detect that 2 files are
different, but we must decide which one will replace
the other one. For that point we will decide on
modification time ... Thus why use the cpu for doing
checksum.

 




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