UNIX System Services is a required, included component of z/OS. USS is a certified UNIX operating system implementation optimized for mainframe architecture. It is the first UNIX 95 to not be derived from the AT&T source code. Through integration with the rest of z/OS, additional Time Sharing Option 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.
Overview
UNIX System Services allows UNIX applications from other platforms to run onIBM System z mainframes running z/OS. In many cases only a recompile is necessary, although additional effort may be advisable for z/OS integration. While USS supports ASCII and Unicode, and there's no technical requirement to modify ASCII and Unicode UNIX applications, many z/OS users often prefer EBCDIC support in their applications including those running in USS. Consequently, USS provides application and administrator services for converting to/from EBCDIC. Programs running under USS have full, secure access to the other internal functions of z/OS. Database access is one example of how USS can access services found elsewhere in z/OS. Naturally such programs cannot be ported to non-mainframe platforms without rewriting if they use these z/OS-specific services. Conversely, if a program adheres to UNIX standards such as POSIX and ANSI C, it will be easier to move it between different UNIX operating systems including z/OS UNIX. The file systems for USS, which support UNIX-style long filenames, appear as specialVSAM datasets to the rest of z/OS. Numerous core z/OS subsystems and applications rely on UNIX System Services, including the z/OS Management Facility, XML parsing and generation services, OpenSSH, the IBM HTTP Server for z/OS, the z/OS SDK for Java, and some z/OS PKI services as examples. USS also provides a shell environment, OMVS. USS's predecessor was an operating system component called OpenEdition MVS, first implemented in MVS/ESA 4.3 and enhanced in MVS/ESA 5.1. OpenEdition MVS only supported the POSIX standards. IBM continues to enhance UNIX System Services. Typically every release of z/OS includes enhancements to USS.
