version had 1742 programming interfaces.

An authorized guide is available for the version.

2004 Edition

In 2004, a new edition of the POSIX.1-2001 standard was released, incorporating two technical corrigenda. It is called IEEE Std 1003.1, 2004 Edition. Some informally call it POSIX.1-2004, but this is not an official identification.

2008: Single UNIX Specification, version 4, POSIX.1-2008

In December 2008, the Austin Group published a new major revision of SUS and

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