I've been using 7-zip to archive large collections of files--mainly college and documents which have high potential to be compressed. 7-zip has a high compression ratio--higher than bzip2, but also higher than the evil RAR archive everyone seems to like--and it's GPL and widely available for GNU+Linux, UNIX and Mac via `p7zip'. However, I've been slightly concerned that it doesn't retain POSIX file modes. For files like text, graphics, etc. this doesn't really bother me. However, if I was going to archive something which contains scripts, or a shared directory where user ownership needs to be preserved, I'd need to retain this extra information.
I have seen it a couple times while browsing, and thought "oh...". When I tried to look for it, I really found a lack of examples. After careful reading of the manuals for
tar and
7z, following is the solution:
To encode:
tar cf - data/ | 7za a data.tar.7z -si
To decode:
7za x ~/data.tar.7z -so | tar xf -
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