Điều này cho phép bạn theo dõi thông tin đăng nhập từ các trang web riêng biệt, nhưng vẫn cho phép mỗi người trong số họ truy cập vào các tập tin được chia sẻ. Cách đảm bảo hệ thống UUCP được mô tả chi tiết trong Chương 15, UUCP. | Chapter 1 History of UNIX quite similar to Berkeley UNIX - not surprising as it was based on BSD . Simpo PDF Merge and Split Unregistered Version - http As other companies entered the UNIX marketplace they faced a question of which version of UNIX to adopt. On the one hand there was Berkeley UNIX which was preferred by academics and developers but which was unsupported and was frighteningly similar to the operating system used by Sun soon to become the market leader. On the other hand there was AT T System V UNIX which AT T the owner of UNIX was proclaiming as the operating system standard. As a result most computer manufacturers that tried to develop UNIX in the mid-to-late 1980s - including Data General IBM Hewlett Packard and Silicon Graphics - adopted System V as their standard. A few tried to do both coming out with systems that had dual universes. A third version of UNIX called Xenix was developed by Microsoft in the early 1980s and licensed to the Santa Cruz Operation SCO . Xenix was based on AT T s older System III operating system although Microsoft and SCO had updated it throughout the 1980s adding some new features but not others. As UNIX started to move from the technical to the commercial markets in the late 1980s this conflict of operating system versions was beginning to cause problems for all vendors. Commercial customers wanted a standard version of UNIX hoping that it could cut training costs and guarantee software portability across computers made by different vendors. And the nascent UNIX applications market wanted a standard version believing that this would make it easier for them to support multiple platforms as well as compete with the growing PC-based market. The first two versions of UNIX to merge were Xenix and AT T s System V. The resulting version UNIX System V 386 release incorporated all the functionality of traditional UNIX System V and Xenix. It was released in August 1988 for 80386-based computers. In
