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Chapter 1. Products and components > UNIX System Services and z/OS - Pg. 17

1.2 UNIX System Services and z/OS UNIX System Services is an element of z/OS A UNIX operating environment implemented within the z/OS operating system The z/OS support enables two open systems interfaces on the z/OS operating system: An application program interface (API) An interactive shell interface UNIX System Services provides: XPG4 UNIX 1995 conformance Assembler callable services TSO/E commands to manage the file system ISPF shell environment