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The Single UNIX Specification, Version 2

What is UNIX®?

UNIX 98 | UNIX 03 | UNIX V7

The Single UNIX Specification Version 4

The Single UNIX Specification Version 3

ISO/IEC 9945

UNIX System API Tables

UNIX Certification

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How many APIS are there?

Tables of the APIs are available.

The Single UNIX Specification Version 2 now has over 1400 programming interfaces. The UNIX 98 Workstation profile which includes CDE (and thus X11 and Motif) increases this number to over 3000 programming interfaces.