<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> A Unix architecture is a computer operating system system architecture that embodies the Unix philosophy . It may adhere to standards such as the Single UNIX Specification (SUS) or similar POSIX IEEE standard . No single published standard describes all Unix architecture computer operating systems - this is in part a legacy of the Unix wars . </P> <P> There are many systems which are Unix - like in their architecture . Notable among these are the GNU / Linux distributions . The distinctions between Unix and Unix - like systems have been the subject of heated legal battles, and the holders of the UNIX brand, The Open Group, object to "Unix - like" and similar terms . </P>

What is the features of unix operating system