Related:

• Version 7 alt. V7 /vee' se'vn/ n. The first widely distributed version of Unix, released unsupported by Bell Labs in 1978.
  The term is used adjectivally to describe Unix features and programs that date from that release, and are thus guaranteed to be present and portable in all Unix versions (this was the standard gauge of portability before the POSIX and IEEE 1003 standards)....
• USG UNIX: /U-S-G yoo'niks/ n. Refers to AT&T UNIX commercial versions after {Version 7}, especially System III and System V releases 1, 2, and 3.
  So called because during most of the lifespan of those versions AT&T's support crew was called the `UNIX Support Group'....
• BSD /B-S-D/ n. [abbreviation for `Berkeley Software Distribution'] a family of Unix versions for the DEC VAX and PDP-11 developed by Bill Joy and others at Berzerkeley starting around 1980
  incorporating paged virtual memory, TCP/IP networking enhancements, and many other features....
• BSD: /B-S-D/ n. [abbreviation for `Berkeley System Distribution'] a family of {{UNIX}} versions for the {DEC} {VAX} and PDP-11 developed by Bill Joy and others at {Berzerkeley} starting around 1980
  incorporating paged virtual memory, TCP/IP networking enhancements, and many other features....
• USG Unix /U-S-G yoo'niks/ n. Refers to AT&T Unix commercial versions after Version 7, especially System III and System V releases 1, 2, and 3.
  So called because during most of the lifespan of those versions AT&...
• V7 /V'sev'en/ n. See Version 7.
• fossil: n. 1. In software, a misfeature that becomes understandable only in historical context, as a remnant of times past retained so as not to break compatibility.
  Example: the retention of octal as default base for string escapes in {C}, in spite of the better match of hexadecimal to ASCII and modern byte-addressable architectures....
• Missed'em-five: n. Pejorative hackerism for AT&T System V UNIX, generally used by {BSD} partisans in a bigoted mood.
  (The synonym `SysVile' is also encountered.) See {software bloat}, {Berzerkeley}....
• ken: /ken/ n. 1. [UNIX] Ken Thompson, principal inventor of UNIX.
  In the early days he used to hand-cut distribution tapes, often with a note that read "Love, ken"....