Re: Whats your way of sharing data between PCs?
On Mon, 22 Sep 2014 20:12:08 +0200
Hans <hans.ullrich@loop.de> wrote:
> Am Montag, 22. September 2014, 17:59:33 schrieb Joerg Desch:
> > Am Sun, 21 Sep 2014 11:45:23 +0200 schrieb Hans:
> > >> Unison doesn't use rsync. As far as I know, Unison uses a rsync
> > >> alike algorithm which is bidirectional, while rsync is only
> > >> unidirectional.
> > >
> > > Nope, rsync is bidirectional, too.
> >
> > Are you shure? I'm only aware of the unidirectional sync. The man
> > page tells me this as description:
> >
> > Rsync is a fast and extraordinarily versatile file copying
> > tool. It can copy locally, to/from another host over any remote
> > shell, or to/from a remote rsync daemon.
> >
> > Which option enables bidirectional syncing? How are conflicts
> > handled? I could find the infos in the man page.
>
> Maybe I am wrong with the term "bidirectional", but you can tell
> rsync which way to syncronise. Say there are two computers, Adam and
> Eve, and you are sitting at Adam.
>
> You can say
>
> rsync -a Adam-IP/Folder Eve-IP/Folder
> or
> rsync -a Eve-IP/Folder /Adam-IP/Folder
>
> The first one is always source, the second target.
>
> However, maybe I did misunderstood the term bidirectional!
>
No, but possibly the terms 'full-duplex' and 'half-duplex' might work
better here...
Unison will synchronise both ways with *one* command, except for
conflicts where the same file has changed in different ways, or where
permissions do not allow overwriting or deleting. Effectively it issues
two rsync-type commands, plus a bit of administration.
Unison is explicitly designed for synchronising two working directories,
whereas rsync might be used for several other kinds of backup, normally
one-way only. Unison can be used from the command line, but is then much
less versatile than rsync. It really exists to make quick pointy-clicky
work of a routine desktop task with locally-mounted directories. For
remote use, it expects local NFS or samba mounts.
--
Joe
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