CentOS - Mar 2021 - Tar of files

On 3/3/21 8:53 AM, Jerry Geis wrote:
> When I "tar" up an archive the files have an owner bob,
> when I extract that to another machine bob is there also but user number is
> different.
If you pack and extract as root, then numeric UID will be the same. But 
on different systems there may be different usernames that have that 
numeric UID.

Incidentally: sometimes we enable SGID bit on a directory (to have 
everything that is created in it inherit the group that directory 
belongs to). tar will be one of the tools that will break it: extracted 
archive will have group as it was in the archived original (numeric GID 
that is, if both archiving and un-archiving was performed by root).

I hope, this helps.

Valeri
> So when I extract bob is no longer the owner of the files but someone else.
> 
> Is there a good way to account for this ?
> User ID on one box being different to the next box ?
> 
> I was expecting to untar and bob still be the owner .
> 
> Thanks,
> 
> Jerry
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-- 
++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++

Does anyone understand why there exists a "--numeric-owner" flag?  I
replied off-list with the same information as others posted here, but the
existence and docs for that flag at least imply that the default is usernames,
not UIDs.

							Noam