Hey, people keep asking this, let’s put it this way, the earliest Unix was open, and many organizations modified Unix. The most famous one in the semester is the modified version of Berkeley University, called bsd, which is Unix. branch.

Because the bsd protocol allows you to directly use and modify its code, and it can be used for commercial purposes, many companies' unixes are derived from bsd. For example, hp-unix, ibm's aix, etc.

Linux is an open source system that imitates the Unix architecture and attempts to be compatible with Unix without any reference to Unix code.

In other words, BSD is a branch of Unix, while Linux is a Unix-like system or a Unix-like system.

Unix operating system?

UNIX operating system (Eunice) is a powerful multi-user, multi-tasking operating system that supports multiple processor architectures. According to the classification of operating systems , a time-sharing operating system, was first developed by Ken Thompson, Dennis Ritchie and Douglas McIlroy in 1969 at AT&T's Bell Labs. Currently, its trademark rights are owned by the International Open Standards Organization. Only UNIX systems that comply with the single UNIX specification can use the name UNIX, otherwise they can only be called UNIX-like (UNIX-like).

BSD?

BSD (Berkeley Software Distribution, Berkeley Software Suite) is a derivative of Unix, developed and released by the University of California, Berkeley, between 1977 and 1995. Historically, BSD was once considered a branch of UNIX-"BSD UNIX" because it shared basic code and design with the AT&T UNIX operating system. In the 1980s, many variations of UNIX-licensed software were developed. The more famous ones are DEC's Ultrix and Sun's SunOS. In the 1990s, BSD was largely replaced by System V4. Today, "BSD" does not refer specifically to any BSD derivative, but is the general name for a branch of UNIX-like operating systems.

Linux system?

The Linux operating system is a clone system developed based on the UNIX operating system. It was born on October 5, 1991 [Linux Desktop] (this This is the first time it is officially announced to the outside world). Later, with the help of the Internet network and the joint efforts of computer enthusiasts around the world, it has become the most commonly used UNIX operating system in the world today, and the number of users is still growing rapidly.