🚀 go-pugleaf

ken@syd.dit.CSIRO.AU (Ken Yap) writes:

davidn wrote:
> | (cd /usr; tar cf - . ) | (cd /mnt; tar xvf -)
> |
> | The effect is to run tar twice in a pipe, the sending end creating
> | an archive into the pipe starting at /usr, and the receiver grabbing
> | data from the pipe and unpacking it into /mnt.

> That's excellent advice and I would add this:

> (cd /usr; tar cf - . ) | (cd /mnt; tar xvpf -)

> The p flag says retain original mode of the files.  Otherwise you get
> whatever mode results from the current umask.

> I've also read that cp -A (GNU cp) or something like that will also do
> the job but never tried it myself.

"cp -a" does the job.  Preserves ownership & permissions.  A GNU
enhancement to cp.  See man cp.

I've used it many times for precisely this purpose...moving a
subdirectory onto a new partition.  I even do the "mv usr usr.old" thing
that david recommended - it never hurts to leave yourself a way to back
out of a major change, just in case it f***s up.  When I'm sure that the
new setup is working properly, "rm -rf usr.old" recovers a lot of disk
space for me.


Craig

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  cas@muffin.pronet.com                                cas@muffin.apana.org.au
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