.. SPDX-License-Identifier: GPL-2.0

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System V Release
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**System V**, also known as **System V Release**, is one of the versions of the
Unix operating system. Below are the key standard versions of System V:

- **System V Release 1 (SVR1) (1983)**: Initial release by `AT&T`, derived from
  `UNIX System III`.
- **System V Release 2 (SVR2) (1984)**: Introduced demand paging, filesystem
  enhancements, and improvements in memory management.
- **System V Release 3 (SVR3) (1987)**: Introduced new IPC mechanisms, improved
  file system performance, and virtual memory improvements.
- **System V Release 4 (SVR4) (1989)**: Unified features from BSD, Xenix, and
  SunOS, support for TCP/IP, virtual file system (VFS), and improved inter-
  process communication.
- **System V Release 5 (SVR5) (1997)** (as UnixWare 7): Enhanced scalability,
  better file system support, improved networking capabilities, and enhanced
  security features.

System V has evolved through multiple standard versions, each adding significant
improvements and features to the Unix operating system. The most notable
versions include SVR1, SVR2, SVR3, SVR4, and SVR5, with **SVR4 being a major
milestone due to its unification of features from various Unix variants**.