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These concepts are collectively known as the "Unix philosophy".

The printed documentation, typeset from the online sources, was contained in two volumes.

The names and filesystem locations of the Unix components have changed substantially across the history of the system.

From the perspective of a power user or programmer, Unix systems are characterized by a modular design that is sometimes called the "Unix philosophy"—that is to say, the operating system provides a set of simple tools that each perform a limited, well-defined function, and a shell scripting and command language to combine the tools to perform complex workflows.

Additionally, Unix also distinguishes itself from its predecessors as the first portable operating system: almost the entire operating system is written in the C programming language that allowed Unix to reach numerous platforms.

Gillies at the University of Illinois Department of Computer Science.

During the late 1970s and early 1980s, the influence of Unix in academic circles led to large-scale adoption of Unix (BSD and System V) by commercial startups, including Sequent, HP-UX, Solaris, AIX, and Xenix.By including the development environment, libraries, documents and the portable, modifiable source code for all of these components, in addition to the kernel of an operating system, Unix was a self-contained software system, this was one of the key reasons it emerged as an important teaching and learning tool and has had such a broad influence.The inclusion of these components did not make the system large – the original V7 UNIX distribution, consisting of copies of all of the compiled binaries plus all of the source code and documentation occupied less than 10 MB and arrived on a single nine-track magnetic tape.Over the years, many Unix-like operating systems have been developed, but Linux is the most popular; in fact, Linux has displaced SUS-certified Unix on many server platforms since its inception in the early 1990s.The world's most-used mobile operating system, Android, is based on Linux.Starting in 1998, the Open Group and IEEE started the Austin Group, to provide a common definition of POSIX and the Single UNIX Specification, which, by 2008, had become the Open Group Base Specification.In 1999, in an effort towards compatibility, several Unix system vendors agreed on SVR4's Executable and Linkable Format (ELF) as the standard for binary and object code files, the common format allows substantial binary compatibility among Unix systems operating on the same CPU architecture.; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties in the late 1970s, leading to a variety of both academic and commercial Unix variants from vendors like the University of California, Berkeley (BSD), Microsoft (Xenix), IBM (AIX), and Sun Microsystems (Solaris).Under Unix, the operating system consists of many utilities along with the master control program, the kernel, the kernel provides services to start and stop programs, handles the file system and other common "low-level" tasks that most programs share, and schedules access to avoid conflicts when programs try to access the same resource or device simultaneously.To mediate such access, the kernel has special rights, reflected in the division between user space and kernel space.

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