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pax - the POSIX archiver - Apparently the mksh guy maintains the most current incarnation of this. (thx pgas)

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http://wiki.bash-hackers.org – pax can do a lot of fancy stuff, feel free to contribute and more awesome pax tricks! Introduction The POSIX archiver, pax, is an attempt to have a standardized archiver that has the best features of the classic big two (tar and cpio) combined, while being able to work on all common archive types. (HowTos)