well, During the late 1970s and early 1980s, Unix's influence in academic circles led to large-scale adoption of Unix (particularly of the BSD variant, originating from the University of California, Berkeley) by commercial startups, the most notable of which is Sun Microsystems. Today, in addition to certified Unix systems, Unix-like operating systems such as Linux and BSD derivatives are commonly encountered.
Version 7:
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.
Unix System V:
commonly abbreviated SysV and rarely called System 5, was one of the versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, termed Releases 1, 2, 3 and 4. System V Release 4, or SVR4, was the most successful version, and the source of several common Unix features, such as "SysV init scripts" (/etc/init.d), used to control system startup and shutdown. The system also forms the basis of the System V Interface Definition (SVID), a standard defining how System V systems should work. The other one of the two major branches of the Unix system is Berkeley Software Distribution.
While AT&T sold their own hardware which ran System V (see AT&T Computer Systems), most customers ran a version from a reseller, based on AT&T's reference implementation. Popular SysV derivatives include Dell SVR4 and Bull SVR4. The most widely used versions of System V today are IBM's AIX and SCO OpenServer, based on System V Release 3, and Sun Microsystems' Solaris Operating System and SCO UnixWare, both based on System V Release 4.
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11:51 AM on June 24, 2008