UNIX, a powerful multi-users and multitasks system. It supports various CPU frameworks. According the classification of operating system, it belongs to time-sharing operating system.
It is firstly developed by Ken Thompson,
Dennis Ritchie and Douglas McIlroy is AT&T Bell Labs in 1969. Through years'
development and improvement, it has become a popular operating system and it has
formed a products family based on this operating system techniques. As UNIX has the feature of mature technology, simple
structure, high reliability, great portability, high operability, excellent
functions of network and data base, outstanding flexibility and openness, it can
satisfy various requirements of any situations and has become the main
workstation platform and important enterprises operation platform. It is mainly
installed in the supercomputer and large computer but it also can be used in PC
and embedded system. It has been the best choice of server system and occupied
the most of market shares. But recently it has failed in the competition with
Windows Server and Linux. Ken and Dennis have firstly
developed UNIX in the Bell Labs and the following 10 years, UNIX has been widely
used by the academic institutions and large enterprises. At that time the UNIX
owner, AT&T authorized the UNIX source code to academic institution for
researching or teaching in a very low price. Many institutions have extended and
improved the source code, forming a kind of UNIX Variations. Those variations
have promoted the development of UNIX. Among the variations the most famous one
is the BSD products developed by University of California, Berkeley.
After that, AT&T has relized the commercial value of UNIX, and stopped the
authorization of UNIX source code and declared the copyright of UNIX and its
variations. The BSD UNIX has a strong effect in the UNIX history and is used by
many manufacturers, becoming the base of commercial UNIX. BSD is identified in a
way of major version pluses minor version, such as 4.2BSD, 4.3BSD. There is
derivative version on the base of original version. Generally these versions
have their own names such as 4.3BSD-Net/1, 4.3BSD-Net/2, etc. The growing
influence of BSD has finally caused the attention of AT&T, so a lasting
copyright lawsuit has started. This lawsuit has made the AT&T sell its UNIX
system labs and the Novell has replaced AT&T. The Novell has taken an
enlightened way to solve the problem that it allows Berkeley releasing BSD free
in the premise of deleting all the code of T&T. Therefore 4.4 BSD Lite has
been released. This version has no copyright problems and has become the basic
version of modern BSD system. Even later on the non-commercial version UNIX has
been through a lot of evolutions, it is at last on the base of BSD version
(except Linux). So 4.4BSD is the base of all the Free Version
BSD has three main parts in the development: FreeBSD, OpenBSD and
The following several decades, UNIX is still changing. The copyright
owner is also changing and the number of lease granters is growing, too. UNIX
copyright once is own by AT&T, after that Novell, and SCO (there is
still disputability between those two). Some large firms developed
their own UNIC products after getting the UNIX authorization, such as AIX of
IBM, HPUX of HP, Solaris of SUN, and IRIX of SGI. The design idea of UNIX is
advanced. Many present popular techniques and methods like micro kernel
technology, process communication, TCP/IP protocol, and client/server mode, etc,
are all from the UNIX. It has almost affected all the present operating systems.
Because of its high security and high efficiency it is widely used in the server
field. Before GNU/Linux gets popular UNIX has been the main stream of science
computing, large and super computers.
Differences and Relations between UNIX and LINUX
biggest difference between Linux and UNIX is the former is the free software
with open source code and the latter is the commercial software with copyright
protection. The difference reflects in that users have more free space to manage
Linxu but have to adapt to UNIX. It also reflects in that Linux is developed in
an open environment but UNIX is developed secretly.
The other two
1. UNIX supports more kinds of hardwares than Linux. Both of
them run stably.
2. Both of them are multi-users, multitasks operating
systems. They can both be used as network operating system.
For more information: http://www.data-recovery-app.com/