Unix is not a single
operating system. It has many flavors (aka. variants, types, or implementations).
Although based on a core set of Unix commands, different flavors have their
own unique commands and features, and designed to work with different types
of hardware. No one knows exactly how many Unix flavors are there, but it is
safe to say that if including all those that are obscure and obsolete, the number
of Unix flavors is at least in the hundreds. You can often tell that an operating
system is in the Unix family if it has a name that is a combination of the letters
U, I, and X.
The following is
some of the well-known Unix flavors, with links to their official home pages.
BSD/OS (BSDi) by Wind River
CLIX by Intergraph Corp.
Debian GNU/Linux by Software in the Public
Tru64 Unix (formerly Digital Unix)
by Compaq Computer Corp.
by IBM (formerly by Sequent Computer Systems)
Esix Unix Esix Systems
FreeBSD by FreeBSD Group
GNU Herd by GNU Organization
SPARC64/OS by HAL Computer Systems, Inc.
Irix by Silicon Graphics,
Linux by several groups several
LynxOS by Lynx Real-Time
MacOS X Server by Apple Computer,
NetBSD by NetBSD Group
NonStop-UX by Compaq Computer Corporation
OpenBSD by OpenBSD Group
OpenLinux by Caldera Systems, Inc.
Openstep by Apple Computer, Inc.
Red Hat Linux by Red Hat Software, Inc.
Unix by Siemens AG
SCO Unix by The Santa Cruz Operation
Solaris by Sun Microsystems
SuSE by S.u.S.E., Inc.
Silicon Graphics, Inc.
UTS by UTS Global, LLC