>Date: Thu, 16 Aug 2007 16:47:39 -0400
>From: Glenn Fowler <gsf at research.att.com>
>Subject: Re: CIFS system attributes support for cpio(1), pax(1), tar(1)
[PSARC/2007/459 FastTrack timeout 08/17/2007]
>
>On Thu, 16 Aug 2007 12:17:13 -0700 (PDT) Don Cragun wrote:
>> When extracting files from an archive, three ways to specify it would
>> be:
>> pax -r -s ",^/,," -x cpio < cpio_archive
>> pax -r -s "/^\///" -x pax < pax_archive
>> pax -r -s "x^/xx" -x ustar < ustar_archive
>
>one minor nit,
> "The archive formats described in the EXTENDED DESCRIPTION
> section shall be automatically detected on input."
>so the ``-x format'' are not needed -- -x is actually not listed for the -r
mode,
>at least at http://www.opengroup.org/onlinepubs/009695399/toc.htm
>so this would suffice
>
> pax -r -s ",^/,," < any_archive_the_implementation_groks
>
>I believe with ``-r -x format'' an implementation may treat input archive
>mismatch as an error, but this is not explicitly stated in the standard
Glenn,
Yes, you're correct. Allowing -x to be used with -r is an
extension to the standard; I believe several implementations verify
that the format specified by -x is actually the format found on stdin
when both are used, but the standard is completely silent on what
happens when both -r and -x are specified on the same command line.
>
>(this *may* be the only spot in the standard where I have a chance of
> knowing something Don doesn't)
I'm sure you know a lot more about some sections of the shell
than I do as well...
Cheers,
Don
>
>-- Glenn Fowler -- AT&T Research, Florham Park NJ --
