Possible Duplicate:
How Unix is Mac OS X?
People always said ubuntu, linux is UNIX based OS, then how about mac os x? from mac os x terminal i can see most of the unix command are available does it mean mac os also built on UNIX?
Possible Duplicate:
How Unix is Mac OS X?
People always said ubuntu, linux is UNIX based OS, then how about mac os x? from mac os x terminal i can see most of the unix command are available does it mean mac os also built on UNIX?
Yes.
Indeed 10.5 and 10.6 are Unix (tm) certified which linux is not.
To be more specific, Mac OS X is built on Darwin---a derivative of BSD---running on a Mach microkernel.
Indeed it is:
Mac OS X, whose "X" represents the Roman numeral for "10" and is a prominent part of its brand identity, is a Unix-based operating system, built on technologies developed at NeXT >between the second half of the 1980s and Apple's purchase of the company in late 1996. Its sixth release Mac OS X v10.5 "Leopard" gained UNIX 03 certification while running > on Intel processors.
From: http://en.wikipedia.org/wiki/Mac_OS_X
As another poster stated it's also Unix certified: http://www.opengroup.org/openbrand/register/brand3555.htm
Mac OS X is a genetic UNIX (being a descendant of NEXTSTEP and ultimately BSD, a genetic UNIX).
It's also a UNIX-like OS (being UNIX-like).
See the relationship to UNIX and Linux here:
http://www.netneurotic.de/mac/unix/timeline.html
Note that Linux is UNIX-like but no genetic or trademark UNIX. Mac OS X is both a trademark and a genetic UNIX.