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This article mainly explains "what system is BSD". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what system BSD is.

Historically, BSD has been considered a branch of UNIX-"BSD UNIX" because it shares basic code and design with the AT&T UNIX operating system. In the 1980s, many deformed UNIX licensed software were derived. The more famous ones are Ultrix of DEC and SunOS of Sun. In the 1990s, BSD was largely replaced by System V4.x and OSF/1 systems, and the late BSD version provided a platform for several open source software development and has been in use ever since. Today, "BSD" does not refer specifically to any BSD derivative, but to a branch of the UNIX-like operating system.

Open source derivative system

Different BSD operating systems can be applied to a variety of hardware architectures for different uses and users. BSD is often seen in government agencies. While the following BSD features may not be unique, each BSD has gradually gained a good reputation in its own area, some focusing on performance and some on security.

DragonflyBSD is the youngest BSD, specializing in providing a better symmetric multiprocessor system than FreeBSD, and making the kernel directly support SSI clusters to achieve better computing results. The project has only been in this direction for a few years, focusing on the i386 platform.

FreeBSD is famous for its ease of use and high performance in the BSD family. Because it is mainly used as a microprocessor architecture, such as i386 and AMD's 64-bit i386 extensions, FreeBSD pays great attention to multiprocessors. FreeBSD works very well on i386 and amd64 servers, but it can also run on other hardware architectures.

NetBSD has excellent portability and can run on as many as 54 platforms, ranging from embedded handheld devices to large server farms, and NetBSD even serves on the International Space Station.

OpenBSD excels in cryptography and security and has good portability, which is, of course, slightly inferior to NetBSD. Security features such as OpenSSH were pioneered by OpenBSD. OpenBSD runs as a security request machine (security demanding machines) and is well received.

It must be noted that the above list is more based on perceptual knowledge, and for its development focus, there are no strict rules. In practice, each specific BSD can perform many roles and tasks.

PCBSD is an open source operating system based on freebsd for desktop applications. Pcbsd has developed a new software installation method-PBI format, which makes it easy to use. In addition, BSD versions focusing on desktop applications include DesktopBSD and so on.

The difference from Linux

BSD is an important branch of Unix, which itself is Unix,Linux, not Unix, but only Unix-like operating system. BSD uses the BSD protocol to publish its binary files and source code, while Linux uses the GPL protocol. Due to legal disputes and many other reasons, BSD, which is also free software, has not spread as widely as Linux.

BSD license Agreement (also known as BSD license)

The BSD license was originally used in various 4.4BSD/4.4BSD-Lite versions published by the University of California, Berkeley (BSD is short for Berkly Software Distribution), and has since been used gradually. In 1979, the University of California, Berkeley released BSD Unix, which is known as the pioneer of open source code, and the BSD license developed with BSD Unix. The BSD license is now adopted by open source software such as Apache and BSD operating systems.

Compared with the strictness of the GPL license and the MPL license, the BSD license is much more relaxed, it only needs to attach the original text of the license, but interestingly, it also requires all further developers to put their own copyright materials on it, so getting the software issued under the BSD license may encounter a small situation, that is, these copyright material licenses take up more space than the program.

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