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From: "Thomas Mueller" <mueller6727@bellsouth.net>
To: freebsd-questions@FreeBSD.org
References: <20111119223633.GD13594@itcom245.staff.itd.umich.edu>
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Cc: William Bulley <web@umich.edu>
Subject: Re: where to ask about problems with bsdinstall in 9.0RC2?
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from William Bulley <web@umich.edu>:

> Possible, but unlikely.  Plus I doubt that 'tar -tvf base.txz' without a
> pipe having an "xzcat(1)" in front of the "tar(1)" command.  Maybe there
> is an "xz" option for tar(1) during extraction mode, but my tar(1) man
> page doesn't list any, sigh...  It does list -y and -z options for other
> compression/decompression modes, hmmm....   :-(

It looks like tar in extraction mode automatically recognizes xz compression in the file to be extracted from.

Section from the man page for tar in FreeBSD 9.0-RC1:

     -J, --xz
             (c mode only) Compress the resulting archive with xz(1).  In
             extract or list modes, this option is ignored.  Note that, unlike
             other tar implementations, this implementation recognizes XZ com-
             pression automatically when reading archives.


Tom