Started with AT&T source code. In 1991 NetBSD group at Berkeley, California was formed. Then a second group was formed and created FreeBSD. From there a third group adopted OpenBSD.
What is an Operating System?
The operating system communicates with the system hardware to control the computer's input/output systems. Keyboards and disk drives, and that loads and runs other programs. The operating system is also a set of mechanisms and policies that help define controlled sharing of system resources.
The kernel The kernel is a special program that is loaded into the computer when it is first started. Load modules, such as device drivers, after the system starts running.
Standard utility programs Some programs serve a single function other programs are large and perform many functions.
System database files Most files are relatively small and are used by a variety of programs on the system.
System startup and configuration files Startup and configuration files store information how to look up network name and address.
Security Policy The policy determines how the computer is run with the respect to the users and system administration. Establishing a policy role in the overall process of operating a secure system.
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