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FreeBSD is a free-software Unix-like operating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD [3] —the first fully functional and free Unix clone—and has since continuously been the most commonly used BSD-derived operating system.
Current BSD operating system variants support many of the common IEEE, ANSI, ISO, and POSIX standards, while retaining most of the traditional BSD behavior. Like AT&T Unix, the BSD kernel is monolithic, meaning that device drivers in the kernel run in privileged mode, as part of the core of the operating system.
CRUX is a Linux distribution mainly targeted at expert computer users. It uses BSD-style initscripts and utilizes a ports system similar to a BSD-based operating system. Chimera Linux: Chimera Linux is a Linux distribution created by Daniel Kolesa, a semi-active contributor to Void Linux. It uses a userland and core utilities based on FreeBSD.
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.
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. [5]
Unix-like: 4.4 elks: FreeBSD: BSD; GPL, LGPL software usually included Monolithic with modules C 1:1 BSD, Unix-like 11 DragonFly BSD OpenBSD: BSD Monolithic C 1:1 BSD, Unix-like 6.4 MirOS: NetBSD: BSD Monolithic with modules C 1:1 BSD, Unix-like 7.0 OpenBSD DragonFly BSD: BSD Hybrid: C 1:1 BSD, Unix-like No OpenSolaris, illumos: CDDL ...
NetBSD is a free and open-source Unix-like operating system based on the Berkeley Software Distribution (BSD). It was the first open-source BSD descendant officially released after 386BSD was forked. [4] [5] It continues to be actively developed and is available for many platforms, including servers, desktops, handheld devices, [5] and embedded ...
Junos operating system is primarily based on FreeBSD on bare metal and later also with Linux kernel. [8] Because FreeBSD is a Unix implementation, users can access a Unix shell and execute normal Unix commands. Junos runs on most or all Juniper hardware systems. [9]