Re: Installation failure caused by CDPATH environment variable

From: Wincent Colaiuta <win@wincent.com>
Date: Jul 17, 2007, 19:07 UTC
Message-ID: <2D8FF91A-02B0-44AF-8B7C-5C46DD6AF352@wincent.com>
In-Reply-To: <7vhco2ancg.fsf@assigned-by-dhcp.cox.net>

El 17/7/2007, a las 20:37, Junio C Hamano escribió:

Show 17 quoted lines

> Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> writes:
>
>> Junio C Hamano wrote:
>>> We could write it as "$(TAR) Ccf blt - ." if we can rely on the
>>> 'C' option, but I suspect it is a GNU extension.  Does anybody
>>> have POSIX.1 handy?
>> I don't have POSIX.1 handy, but on Solaris 10, you need to say:
>>
>> 	tar cf - -C blt .
>>
>> (That is, Solaris' tar has the 'C' option, which is quite a good
>> indication, that it's included in POSIX :-)
>
> Oh, I cannot resist ;-)
>
> Solaris has unlink(2) capable of removing a directory, but I do
> not think it is included in POSIX.

I'd say the answer is "no", "C" isn't in the POSIX tar specification.

The latest, Version 3, says "the Shell and Utilities volume of IEEE Std 1003.1-2001 no longer contains the tar utility" (<http:// www.opengroup.org/onlinepubs/009695399/basedefs/tar.h.html>).

And Version 2, which does contain tar, does not list "C" as an option (<http://www.opengroup.org/onlinepubs/7990989775/xcu/tar.html>).

In fact, the example they give for moving directory hierarchies is exactly this:

   (cd fromdir; tar cf - . ) | (cd todir; tar xf -)

Cheers, Wincent