[W/K] :: Version 7

  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). Note that this usage does _not_ derive from
     the release being the "seventh version of Unix"; research Unix at
     Bell Labs has traditionally been numbered according to the edition of
     the associated documentation. Indeed, only the widely-distributed Sixth
     and Seventh Editions are widely known as V[67]; the OS that might today
     be known as `V10' is instead known in full as "Tenth Edition Research
     Unix" or just "Tenth Edition" for short. For this reason, "V7" is often
     read by cognoscenti as "Seventh Edition". See BSD, {Unix. Some
     old-timers impatient with commercialization and kernel bloat still
     maintain that V7 was the Last True Unix.
  
  

  Version 7
       
           (V7) The unsupported release of Unix
          ancestral to all current commercial versions.  Brian
          Kernighan announced the release of V7 in summer 1979, at the
          Unix User's Group meeting in Toronto.
       
          Before the release of the POSIX/{SVID standards, V7's
          features were often treated as a Unix portability baseline.
          Some old-timers impatient with commercialisation and kernel
          bloat still maintain that V7 was the Last True Unix.
       
          See BSD, USG Unix, System V.
       
          [{Jargon File]
       
          (1996-05-22)