On Tue, Dec 07, 2010 at 05:13:19PM -0600, robert wrote:
> Ken Moffat wrote:
> >
> > Apart from the other responses, I can't help commenting that 'J' is
> > not 'j'. I assume you wrote it as a capital for more emphasis, but
> > with the last two or three releases of tar 'J' is used for xz
> > compression (if you have xz-utils).
> >
> > ĸen
> yep, just emphasis. so "tar Jf" would de-archive bz2 and gz?
>
> That's convenient.
>
No, no, and thrice no!
With recent tar, 'tar -xf' and 'tar -xvf' will determine the format
of the archive, and when necessary it will use your installed bzip2,
gzip, or xz-utils to extract it.
But these recent versions use 'J' to enforce the use of xz
compression or decompression - you would normally specify this when
*creating* the archive. If the format of an existing archive doesn't
match a compression option you have *specified* ('j', 'z', or 'J')
then tar will fail to extract it.
ĸen
--
das eine Mal als Tragödie, das andere Mal als Farce
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