Unix linux BSD-Unix MACOs

UNIX, Linux, BSD-Unix, and MACOs are all computer operating systems.

The earliest Unix was developed in 1973 by Dennis Ritchie at the Bell Laboratory of at&t, which was all written in C language.
After the successful development of the original UNIX, people thought it was very useful. As a result, two major branches emerged: bsd unix and at&t UNIX system. Later, Unix developed many different versions, but they all developed from these two branches.
Because Unix has good stability and powerful data processing capabilities, now mostly used on the server, the major server production companies have their own UNIX system, IBM called Aix, HP called HP-UX, sun's name is Solaris, and there are also unixware and SCO openserver used for PC architecture computers.

In 1977, the teachers and students of the University of California, Berkeley, expanded and modified the UNIX operating system and re-compiled mostCodeTo obtain a Unix branch operating system bsd unix, which is short for Berkeley Software Distribution.
Bsd unix is an open-source operating system like Linux. Currently, there are five BSD systems: FreeBSD, NetBSD, OpenBSD, BSD/OS, and MacOS X. The first three are open-source free software, and the last two are commercial products.

Linux is the most popular open-source operating system in recent years. Linux was the first open-source operating system developed by Finnish college student Linus Torvalds following the Unix structure. The earliest version was released on August 1, 1991. Then, fans from all over the world will work together for subsequent development. Then commercial companies will get involved and gradually form their current scale.

MacOS is a dedicated OS for Apple's apple. The latest version of MacOS X is developed based on the BSD UNIX system.