This article is from the Macintosh system software FAQ, by Elliotte Harold email@example.com with numerous contributions by others.
Does anyone really understand Apple's Unix strategy? If so will you
please explain it to me? As I understand it, A/UX, Apple's well-
respected Unix product of long standing, has been killed in favor
of IBM's roundly despised AIX. A/UX has been officially discontinued
and is not supported on most current hardmare except for some WorkGroup
Servers. Nonetheless you can still buy it and run it on almost any Mac.
AIX, the new "official" Apple Unix cannot be bought for and will not
run on any Apple hardware. Does this leave you confused? If so you're not
alone. For more information about A/UX see Jim Jagielski's FAQ list at
MachTen from Tenon is a commercial Unix-like overlay for the MacOS.
Send email to firstname.lastname@example.org or see
for more details. Because MachTen uses the MacOS filesystem, it has
problems dealing with things like hard links. It's close enough for
many people, though. In particular it's useful for DNS, NNTP,
multihomed Web sites and other Internet server functions that cannot
be handled reliably under the MacOS.
There are development versions of both NetBSD and Linux for the Mac.
Neither is suited for anything more than the developers at this time.
If you're interested in working on the port, see
for more information.