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The Authorized Guide to the Single UNIX Specification, Version 4
The Open Group has prepared a new Source Book covering Version 4 of the Single UNIX Specification and IEEE Std 1003.1-2008 (POSIX®)
Whether you're an experienced developer, a system implementor, a technical manager, or a user of Open Systems, The Open Group's Authorized Guide to the Single UNIX Specification, Version 4 provides the solid base of information you need to exploit this powerful software technology.
This book provides complete information on what's new in version 4 of the Single UNIX Specification and comprehensive reference material.
The book is available for Free download from the Open Group Bookstore
as document G101.