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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user]  Re: [OT] fast recursive local copy
Date: Fri, 14 Aug 2009 10:30:11 +0200
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On Freitag 14 August 2009, Nikos Chantziaras wrote:
> On 08/14/2009 05:47 AM, meino.cramer@gmx.de wrote:
> > Hi,
> >
> >   I am looking for a faster way to do a
> >
> >      cp -a r<thisdir>  <thatdir>
> >
> >   locally on one machine with one harddisk inside.
> >
> >   Is there a neat trick to accomplish this faster than
> >   good old cp?
>
> Nope.  Some people like to use pipes in hope to speed it up, something
> like:
>
>    tar -c <thisdir> | tar -xC <thatdir>
>
> but this isn't really faster and fscks up sparse files.
>
> But if <thatdir> already contains some files from <thisdir>, then rsync
> would be faster than cp.  If not, stick with cp.

use cp with -u and files already existing are skipped.