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Portability of Tar Features
- Date - 2018-11-25 - Version - 1.1 - Copyright - https://creativecommons.org/licenses/by/3.0/ Contents Preface The tar format is one of the oldest archive formats in use. It comes as no surprise that it is ugly — built as layers of hacks on the older format versions to overcome their limitations.
It provides magic bytes along with version field, user and group names up to 31 octets, support for more file types and extension of pathname length with 154-octet prefix. The defining feature of pax format is that it allows for extensions, assuming that incompatible implementations may write the extended attributes as regular files for user inspection. It seems roughly equivalent to pax, except that uppercase X file flag is used in place of lowercase x, and that additional member type is provided for ACLs.
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