this post was submitted on 18 Dec 2024
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A deep dive into the tar format (depot.dev)
submitted 5 days ago by [email protected] to c/[email protected]
7 comments fedilink hide all child comments
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[–] [email protected] 11 points 5 days ago (2 children)

I have never heard of pax.

[–] [email protected] 11 points 5 days ago* (last edited 5 days ago)

I'd say pixz is considerably more interesting to improve tar.

https://github.com/vasi/pixz

Used as a compressor with tar, it adds:

  • Parallel compression/decompression, increasingly important with many-core processors.

  • Indexed access. Tarballs, unlike, say, zip or 7zip, don't normally support jumping right to the point in an archive where a file lives.

It's LZMA-based, like xz, lzip, or 7zip. Good-but-slow compression, faster decompression than bzip.

[–] [email protected] 8 points 5 days ago (1 children)

And now you join the thousands of us who have heard of it but never have any use for it.

Had you heard of cpio? I'm pretty sure I wouldn't have heard of that either if it hadn't been mentioned in a Unix book I bought in the 90s.

[–] [email protected] 2 points 4 days ago (1 children)

Sure. It just feels like "officially replaced" is a little... optimistic.

[–] [email protected] 4 points 4 days ago

I mean officially. In the POSIX standard, it has officially been replaced. de facto standard as by users, it has remained dominant. We have just not been following POSIX as closely as we could (and we don't have any reason to).

[–] [email protected] 7 points 5 days ago (1 children)

Great read! Never knew what is meant

[–] [email protected] 2 points 4 days ago

Thank you!