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2.1.4 UNIX System
UNIX
is a
nonproprietary or
open system,
meaning
that
no
company exclusively
owns
it
or
develops
it,
in
contrast
with
Windows
OS
and
Macintosh
OS,
respectively
owned by Microsoft and Apple. UNIX has been developed into
many versions. Institutes
such
as
AT&T
and
University
of
California had
invented
their software
packages
with
different methods of starting up processes.
UNIX system has three different types that are used until these days:
•
SystemV
UNIX
is
the
type
of UNIX
system
that
is
based
on
AT&T
UNIX and
the
most
commercial
and
widely
used
on
the
market,
such
as
AIX,
Solaris,
Tru64,
and
UnixWare.
It
uses
modularity
method
where
each
individual
service
is run by particular small script and considered package-friendly.
•
BSD
UNIX
is developed
by
the
Computer
Systems
Research
Group of the
University of
California, Berkeley,
hence
the
name
is
Berkeley
Software
Distribution (BSD)
UNIX
system.
BSD/OS,
MacOS
X,
and
NetBSD
are
examples
of
this
system.
It
implements
a
set
of
large
scripts
to
start
everything
up.
•
UNIX-like systems is the clone of UNIX system that works very much like other
UNIX but without software distribution from AT&T, such as Linux and Minix.
2.1.4.1 Linux
As
it
is
mentioned beforehand, Linux
is
one
of
the
UNIX-like
systems,
initially
developed with different set of software packages, which is using all system utilities and
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