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NetBSD is a freely redistributable, open source version of the Unix-derivative Berkeley Software Distribution (BSD) computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed.
BSD was sponsored by DARPA until 1988, [3] which led to the implementation of ARPANET and later the TCP/IP stack to Unix by BSD, [4] which were released in BSD NET/1 in 1988. The codebase had been rewritten so much that as little as 5% of BSD contained original AT&T code, [ 4 ] and therefore NET/1 was released without an AT&T source license.
BSD/OS is a proprietary Unix-like operating system first released in 1993 as BSD/386. It was originally developed and sold by Berkeley Software Design , Inc. (BSDi) and designed to be a Unix for 386 -based PC s.
There are a number of Unix-like operating systems based on or descended from the Berkeley Software Distribution (BSD) series of Unix variant options. The three most notable descendants in current use are FreeBSD, OpenBSD, and NetBSD, which are all derived from 386BSD and 4.4BSD-Lite, by various routes.
Berkeley Software Distribution (BSD) is the name of the Unix derivative distributed in the 1970s from the University of California, Berkeley. The name is also used collectively for the modern descendants of this derivative.
Sony NEWS-OS, a BSD-based operating system for their network engineering workstations; OSF/1, a hybrid kernel based Unix developed by the Open Software Foundation, incorporating a modified Mach kernel and parts of 4BSD Tru64 UNIX (formerly DEC OSF/1 AXP or Digital UNIX), the port of OSF/1 for DEC Alpha-based systems from DEC, Compaq and HP.
OpenBSD is a security-focused, free software, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by forking NetBSD 1.0. [ 4 ] The OpenBSD project emphasizes portability , standardization , correctness , proactive security , and integrated cryptography .
All versions of BSD from its inception up to 4.3BSD-Reno are based on Research Unix, with versions starting with 4.4 BSD and Net/2 instead becoming Unix-like. Furthermore, 8th Edition Research Unix and on-wards had a close relationship to BSD. This began by using 4.1cBSD as the basis for the 8th Edition.