On this page about UNIX System Services:
UNIX System Services (USS) is a required component of z/OS. USS is a certified UNIX implementation (XPG4 UNIX 95) optimized for mainframe architecture. It is the first UNIX 95 which was not derived from the AT&T source code. Through integration with the rest of z/OS, additional time share option (TSO) commands are available alongside the usual UNIX services, making it possible to process UNIX files using ISPF. Extensions in JCL make it possible to use these files in batch processing.
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became a standard part of vanilla MVS/ESA. Under OS/390, it became Unix System Services, and has kept.... Independent specialists reckon it was over 80% open systems-compliant – more than most Unix... MVS/ESA: MVS Enterprise System Architecture. Version of MVS, first introduced as MVS/SP Version 3...