Unix Heritage Wiki

usl_usg

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T01:04:12+00:00

USL/USG Unix Originally set up to support Unix internally, the Unix Support Group eventually became Unix System Laboratories, and developed the System III and System V commercial versions of Unix. 1973: USG Release 1.0 1974: USG Release 2.0 Program Generic Issue 1 1975: MERT First Edition 1976: Program Generic Issue 2 1977: Program Generic Issue 3 PWB UNIX MERT Release 0

usg_base1 - created

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:59:49+00:00

USG Release 1.0 Release Date: December, 1973 Released By: UNIX Support Group Source Code: None Available Documentation: No surviving primary documentation. Very little information about the first USG release survives. It was followed shortly by the monthly USG UNIX Newsletter. A trouble reporting system was established in which system problems were published in each newsletter along with fixes.

mert_base - created

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:56:22+00:00

MERT First Edition Release Date: October, 1975 Released By: UNIX Support Group Source Code: None Available Documentation: The MERT Programmer's Manual from the USG Library. This early edition of MERT is further described in the papers A Structured Operating System for a PDP-11/45 and MERT - A Multi-Environment Real-Time Operating System.

usg3

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:51:06+00:00

USG PG-1C300 Issue 3 Release Date: March, 1977 Released By: UNIX Support Group Source Code: usg_pg_issue_3.tar.bz2 in the Unix Archive, browsable in the Unix Tree Documentation: The UNIX Programmer's Manual's for PG-1C300 has been preserved in the Unix Archive UNIX Program Generic Issue 3, otherwise known as PG-1C300, is a version of the UNIX operating system issued by the UNIX Support Group in March of 1977. The Program Generic line was used as a standard, supported UNIX base on which …

usg2

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:46:39+00:00

USG PG-1C300 Issue 2 Release Date: January, 1976 Released By: UNIX Support Group Source Code: None Available Documentation: UNIX Programmer's Manual PG-1C300 Issue 2 is the programmer's manual and UNIX Program Description is a description of the various routines in the Issue 2 kernel as well as several items in the

usg1

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:45:34+00:00

USG PG-1C300 Issue 1 Release Date: November, 1974 Released By: UNIX Support Group Source Code: None Available Documentation: UNIX Operating System Generic Program Issue 1 describes the files comprising the first Issue of USG Program Generic. This source structure is further described in another

usg_base2

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:44:34+00:00

USG Release 2.0 Release Date: April, 1974 Released By: UNIX Support Group Source Code: None Available Documentation: UNIX Operating System Generic Program Issue 1 describes the files comprising the first Issue of USG Program Generic, which is a revision of USG Release 2.0. This source structure is further described in another

pdp7_unix

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:19:20+00:00

PDP-7 Unix Release Date: Developed from mid-1969 to the end of 1970 Released By: Never released outside of Bell Labs Source Code: Reconstructed from original listings Documentation: Reconstructed from original listings Ken Thompson began the development of the system that was to become Unix, first as a file system on paper and then on a

7th_edition

segaloco (segaloco@undisclosed.example.com) — 2026-04-30T00:15:27+00:00

Seventh Edition Unix Release Date: January 1979 Released By: Bell Labs Research Source Code: v7.tar.gz in the Unix Archive, browsable in the Unix Tree Documentation: 7th Edition man pages are bundled in v7.tar.gz The Seventh Edition of Unix was released by Bell Laboratories in January 1979, nearly four years after Sixth Edition.

1989_xpg3.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2025-10-24T17:48:25+00:00

1985_xpg1.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2025-10-24T17:48:25+00:00

1985_svid_1.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2025-10-24T17:48:16+00:00

1987_xpg2.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2025-10-24T17:42:13+00:00

posix1003.2.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-17T19:35:48+00:00

posix.1-iso9945-1.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-17T19:35:14+00:00

usr_group_1984_cover.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-17T19:34:15+00:00

1995_sus.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-05T23:03:23+00:00

1992_svid_issue_3.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-05T22:47:05+00:00

1986_svid_issue_2.png - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-05T22:47:04+00:00

1988_posix.jpg - created

segaloco (segaloco@undisclosed.example.com) — 2024-06-05T22:31:10+00:00