The pax command supports many formats, but not the SUS/POSIX required "pax" format. This format is required to portably archive files with extended attributes, ACLs, and other non- traditional metadata. See
<http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_01> for details on this format. The OpenBSD version of PAX is used "downstream" by many other distributions, including Red Hat and other Linux distributions. So much of the Unix and Linux community is waiting for years for this "upstream" package to have the useful and required format added, before they fix their own packages. -- Wayne Pollock
