On Sunday 09 March 2008 23:52:59 Markus Klaschka wrote:
Hi,
I never used built-in bzip functionality of tar, but I like bzip2 more
than gzip, so I just searched and found following:
-j (c mode only) Compress the resulting archive with bzip2(1).
In extract or list modes, this option is ignored. Note that, unlike
other tar implementations, this implementation recognizes
bzip2 compression automatically when reading archives.
and
-y (c mode only) Compress the resulting archive with bzip2(1).
In extract or list modes, this option is ignored. Note that, unlike
other tar implementations, this implementation recognizes
bzip2 compression automatically when reading archives.
what's going on there?
I tested the -j option, works good. I created a file.tar.bz2 and like
the manpage describes, tar -cvf is enough to unpack the tarball,
you mean tar xvf
Is that a FreeBSD feature, how is it on other platforms?
Is bzip2 used, or is that build in as a tar?
bsdtar != gtar
In bsdtar -j (-y) indeed uses bzip2 to compress rather than gzip and upon
unpacking it handles both tgz and tbz transparantly that's why you don't need
to specify -j there (different from gtar IIRC). I think -j and -y are mainly
there to be compatible with gtar but I'm not sure. Note that both bsdtar and
bzip2 are in base and have been for a while so it seems like a logical
feature for bsdtar. Knowing whether its a gzip or bzip2 compressed is easy to
see from magic numbers.
Cheers,
Dan
Cheers
-
Markus Klaschka
MKDev - Markus Klaschka Development
http://www.mkdev.eu
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