1998; 26 years ago (1998)[1] (Name changed from OpenEdition to OS/390 UNIX System Services)
Latest release
Version 2.5 (V2R5) / September 30, 2021; 2 years ago (2021-09-30)
Marketing target
Enterprise / Mainframes
Available in
English and most other languages
Platforms
z/Architecture
License
Proprietary
Official website
z/OS UNIX System Services
History of IBM mainframe operating systems
Early mainframe computer OSes
GM OS & GM-NAA I/O (1955)
BESYS (1957)
UMES (1958)
SOS (1959)
IBSYS (1960)
MIT CTSS (1961)
7040/7044 Operating System (16/32K) (7040-PR-150)
1410/7010 Operating System (1410-PR-155)
Miscellaneous S/360 line OSes
BOS/360 (1965)
TOS/360 (1965)
TSS/360 (1967)
MTS (1967)
ORVYL (1967)
RACS (1965)
RAX (1966)
MUSIC (1972)
MUSIC/SP (1985)
DOS/360 and successors (1966)
DOS/360 (1965)
DOS/VS (1972)
DOS/VSE (1979)
VSE/AF (1979)
VSE/SP (1983, 1985)
VSE/ESA (1991)
z/VSE (2005)
VSEn (2021)
OS/360 and successors (1966)
MFT (1966)
MFT II (1968)
OS/VS1 (1972)
OS/VS1 BPE
MVT (1967)
65MP
OS/VS2R1 (SVS) (1972)
MVS (OS/VS2R2 and later) (1974)
MVS/SE (1978)
MVS/SE 2 (1979)
MVS/SP Version 1 (1980)
MVS/XA (1983)
MVS/ESA (1988)
OS/390 (1995)
z/OS (2000)
VM line
CP-40/CMS (1967)
CP-67/CMS (1967)
VP/CSS (1968)
VM/370 (1972)
VM/BSE (BSEPP)
VM/SE (SEPP)
VM/SP (1980)
VM/XA MA (1984)
VM/XA SF (1985)
VM/XA SP (1988)
VM/ESA (1990)
z/VM (2000)
TPF line
ACP (1967)
TPF (1979)
z/TPF (2005)
UNIX and Unix-like
UTS (1981)
AIX/370 (1990)
AIX/ESA (1991)
MVS/ESA OpenEdition (1993)
VM/ESA OpenEdition (1995)
OS/390 UNIX System Services (1996)
Linux (1999)
z/VM OpenExtensions (2000)
z/OS UNIX System Services (2001)
OpenSolaris (2008)
v
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z/OS UNIX System Services (z/OS UNIX, or informally USS) is a base element of z/OS.[2] z/OS UNIX is a certified UNIX operating system implementation (XPG4 UNIX 95) 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 (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.
^"UNIX System Services z/OS Version 1 Release 7 Implementation" (PDF). Software Support Manual. IBM. March 2006. SG24-7035. Name changed from OpenEdition to OS/390 UNIX System Services
^"z/OS base elements". ibm.com.
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