system V (system5)

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Alternatively referred to as SysV, System V was the first commercial version of UNIX; 

 System V has been compared to BSD (which originally stood for Berkeley Software Distribution), another "flavor" of Unix. The first three versions of System V were preferred by businesses, while BSD was favored by university professors and research scientists. After the release of SVR3, AT&T began working with Sun Microsystems to produce a version of System V that would appeal to a wider group of users. 

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