Editing UNIX System Services (section)

{{short description|UNIX for IBM mainframes}}
{{Infobox OS
| name                   = UNIX System Services
| logo                   =
| screenshot             = 
| caption                = 
| developer              = [[IBM]]
| family                 = [[UNIX]] - [[POSIX]]
| source_model           = [[Closed source]]
| released               = {{Start date and age|1998}}<ref>{{cite web
 |     title = UNIX System Services z/OS Version 1 Release 7 Implementation
 |        id = SG24-7035
 |      date = March 2006
 |       url = http://www.redbooks.ibm.com/redbooks/pdfs/sg247035.pdf
 |     quote = Name changed from OpenEdition to OS/390 UNIX System Services
 | publisher = IBM
 |      work = Software Support Manual
 }}
<!-- Page 26 notes "Name changed from OpenEdition to OS/390 UNIX System Services" in 1998 -->
</ref> (Name changed from [[MVS#MVS/ESA|OpenEdition]] to [[OS/390]] UNIX System Services)
| latest_release_version = Version 3.1 (V3R1)
| latest_release_date    = {{Start date and age|2023|09|29}}
| latest_test_version    =
| latest_test_date       =
| marketing_target       = Enterprise / Mainframes
| programmed_in          = 
| prog_language          = 
| language               = [[English language|English]] and most other languages
| kernel_type            = 
| ui                     = 
| license                = [[Proprietary software|Proprietary]] 
| working_state          = Current
| supported_platforms    = [[z/Architecture]]
| updatemodel            =
| package_manager        = 
| website                = [https://www.ibm.com/docs/en/zos/3.1.0?topic=zos-unix-system-services z/OS UNIX System Services]
}}
{{History of IBM mainframe operating systems|unix}}
'''z/OS UNIX System Services''' ('''z/OS UNIX''', or informally '''USS''') is a base element of [[z/OS]].<ref>{{cite web|url=https://www.ibm.com/docs/en/zos/2.5.0?topic=features-zos-base-elements|title=z/OS base elements|website=ibm.com}}</ref>  z/OS UNIX is a certified [[Unix|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 Corporation|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 [[Job Control Language|JCL]] make it possible to use these files in [[batch processing]].