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Unix System Services (USS) is a component of z/OS. USS is an adequate, certified Unix implementation ( XPG4 UNIX 95). It is the first Unix 95 which was not derived from the AT&T/ SCO source code. By the integration in z/OS, additional time share option (TSO) commands are available next to the usual Unix services, making it possible to process Unix files by using ISPF. Extensions in the JCL make it possible to use these files in batch processings.

Unix System Services allows Unix applications to be run on mainframes by IBM, implementing Unix-based services on these computers. Binary programs using the numerical values of ASCII remain the only form of incompatibility — the zSeries architecture is based on EBCDIC. Programs running under USS have full access to the internal functions of z/OS. If this feature is used at all, it is mainly employed in database access ( DB2 via Call Attach). Naturally these programs cannot be ported without rewriting, should they use these internal mechanisms.

The file systems of the USS (HFS or ZFS) appears as special datasets to the rest of the z/OS.

Predecessor of the Unix System Services was an operating system component called Open MVS , which was first implentend in MVSMVS M ultiple V irtual S torage was the most commonly used operating system on the System/370 and System/390 IBM mainframe computers. It is unrelated to IBM's other mainframe operating system called VM/CMS. First released in 1974, MVS was later renamed by/ ESA 4.3. It only supported the POSIX standards.

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Topics: UNIX System Services, Unix like, Unix Billennium, Unix Shell...

UnixUNIX (or Unix is a portable, multi-task and multi-user computer operating system originally developed by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie and Douglas McIlroy. Unices The term Unices includes Unix and Unix-like ope	Unix-likeA Unix-like operating system is one that behaves in a manner similar to the UNIX system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. The term is now most often used to refer to the Unix-like open	Unix billenniumThe Unix Billennium is the point in time represented by a Unix time value of 109: 01:46:40 UTC on September 9 2001. Some programs which stored timestamps using a text representation encountered sorting errors, as in a text sort times after the turnover, s
Unix shellA Unix shell also called "the command line", provides the traditional user interface for the Unix operating system. Users direct the operation of the computer by entering command input as text for a shell to execute. Within the Microsoft Windows suite of	UNIX98UNIX98 is the name applied by The Open Group to operating systems that conform to the Single UNIX Specification, version 2, aka SUSv2. TODO: List of UNIX98 systems.	Unix Amiga EmulatorUAE (or " UNIX Amiga Emulator") is an open source program designed to run software written for the Amiga range of computers. Originally it was called the Unusable Amiga Emulator, due to it not even being able to boot, but that definition has since become
UNIX manual	Unix Amiga Delitracker Emulator	Unix philosophy
Unix security	Unix File System	Unix wars
UNIX-HATERS Handbook	UNIX System Services	UNIX System V

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