What is FreeBSD?
FreeBSD is UNIX − like operating system (an operating system like UNIX), available free on the internet, is very widely used in the world of ISPs (Internet service providers), embedded devices, and other fields that require high reliability.
FreeBSD is made from the original UNIX source code produced by AT & T in 1970.
Years ago, AT & T needed a lot of computers to run their business. At that time, AT & T was banned from participating in the computer business. So they finally sold their software licenses and source code to the university at a cheap price. University students who access this technology can read the source code and learn how the software works.
In return, AT & T gets:
– free programmer
– free patch
– as well as scientists who improve the quality of AT & T software
everyone is happy …
The very well-known AT & T software in this license is UNIX.
why is it called UNIX − like?
Well, the word “UNIX” is a trademark name (trademark) owned by The Open Group. So if you have an operating system product, and want to be named UNIX, your product must be certified by The Open Group, and you have to pay a lot of money to them. Because FreeBSD is made not for profit, the name is UNIX-like.
How can there be FreeBSD until now?
When compared to modern OSes, original UNIX is not very good to use. But, because many students have UNIX source code, and many lecturers have UNIX projects for students, UNIX is experiencing rapid development. Gradually, many useful commands were created, the ability to control “running program” (job control) was added. Filesystems are upgraded as we use now.
Slowly, all the original UNIX source code was revoked and replaced.
Various universities working with UNIX share their improvements with UCLA’s CSRG (Computer Systems Research Group, University of California Los Angeles). CSRG acts as a clearinghouse for all UNIX improvement.
CSRG distributes this free source code to everyone with an AT & T UNIX license.
The work of CSRG is a collection of patches for UNIX known as Berkeley Software Distribution, or BSD UNIX. Berkeley also received a donation from DARPA (Defense Advanced Research Projects Agency) for the implementation of TCP / IP on UNIX.
This process continues until the time is not determined (really long). If you see the copyright statement on FreeBSD, it will look like this:
Copyright 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 … until …?)
The Regents of the University of California. All rights reserved.
YUP !!!, jobs that are more than 15 years old – like developing software for life. The reality is that most of the original UNIX source code has been replaced & improved by CSRG and contributors. So the original AT & T source code looks very little.
BSD License: BSD Goes Public
In the end, CSRG funding stopped. After several political disputes within the University of California. In 1992 the source code was released to the general under a license which became known as the BSD license.
now, BSD licenses have 3 clauses which can be summarized as follows:
• Don’t claim you wrote the source code.
• Don’t blame us if this product breaks / breaks
• Don’t use our name to promote your product.
at first, every person who uses software is required to have an original license, they must notify the University of California to use it. This regulation was deleted a few years later. Today, people can use the BSD source code without having to announce / tell anyone
The BSD license could be “the most liberal software license” that was used. People are free to take BSD and put it into proprietary products, free products, and open − source products. BSD prefers the term “copycenter” rather than “copyright” and “copyleft”. Which means it is roughly like taking this source code from a copycenter then bring this cource code wherever you want. Not surprisingly, companies like Sun Microsystems also take and make copyright because it is truly free (free).
Birth of “The Modern FreeBSD”
During the golden age of CSRG, UNIX work was done quickly at AT & T. AT & T took the BSD UNIX distribution source code and integrated it into their UNIX, then re-licensed the results. This process went smoothly until one day AT & T suddenly got permission to compete in the software business. They have products that are very high-value: a high-end operating system that has been debugged and developed by thousands of people from all over the world. Certain