UNIX System V

System V ( mostly English pronunciation: / ˌ sɪs.təm faɪv / ) is the name of a version of the Unix operating system from AT & T and was first published in 1983 as the successor to System III. Since 1992 it is in the version of System V Release 4.2.


Although System V UNIX referred to a specific derivative, it is now commonly used to refer to an entire class of Unix derivatives of the AT & T UNIX - derived line ( as opposed to the BSD line). The actual technical differences between System V and BSD increasingly blurred, on the one hand, since each line takes many innovations from the competition line, on the other hand a result of their circulation level of the more basic GNU utilities (particularly the GNU coreutils ) instead of BSD-/System V programs.


One of the biggest differences originally included (compared to the current situation, as of 2005):

  • Interprocess communication interfaces were defined completely differently and followed very different philosophies.
  • The management of process signals was slightly different; However, the smaller differences had large effects
  • Some features of the C library were implemented differently or followed other traditions
  • Some important programs behaved differently with the same option specified.
  • Program name and the paths to them differed, in part to no longer comprehensible Art
  • The BSD file system behaves in inheritance of owner properties parent directories different file systems do as System V -like it in BSD properties are automatically inherited, SystemV get newly created objects, the set default properties of the user

Releases and derivatives