This section aims at presenting some systems and pointers to
documentation. It may help you addressing particular problems reported
Posix-conforming systems are
derived from the Unix operating system.
The Rosetta Stone for Unix
contains a table correlating the features of various Posix-conforming
systems. Unix History is a
simplified diagram of how many Unix systems were derived from each
The Heirloom Project
provides some variants of traditional implementations of Unix utilities.
- Darwin is also known as Mac OS X. Beware that the file system can be
case-preserving, but case insensitive. This can cause nasty problems,
since for instance the installation attempt for a package having an
INSTALL file can result in ‘make install’ report that
nothing was to be done!
That's all dependent on whether the file system is a UFS (case
sensitive) or HFS+ (case preserving). By default Apple wants you to
install the OS on HFS+. Unfortunately, there are some pieces of
software which really need to be built on UFS. We may want to rebuild
Darwin to have both UFS and HFS+ available (and put the /local/build
tree on the UFS).
- QNX 4.25
QNX is a realtime operating system running on Intel architecture
meant to be scalable from the small embedded systems to the hundred
processor super-computer. It claims to be Posix certified. More
information is available on the
QNX home page.
- Documentation of several versions of Tru64 is available in different
- Unix version 7
- Officially this was called the “Seventh Edition” of “the UNIX
time-sharing system” but we use the more-common name “Unix version 7”.
Documentation is available in the
Unix Seventh Edition Manual.
Previous versions of Unix are called “Unix version 6”, etc., but
they were not as widely used.