Happy Birthday, Unix!
This month Unix celebrates its 40th birthday. In 1969, Ken Thompson, a researcher at Bell Labs who had previously been working on a larger operating system project when AT&T pulled the plug, wrote the core code of Unix in a month, or so the story goes.
Unix or Unix-like systems are BSD-Systems, HP-UX (Hewlett-Packard), DG/UX (Data General), AIX (IBM), IRIX (Silicon Graphics), Solaris (Sun) und Mac OS X (Apple).
Unix, from Wikipedia, the free encyclopedia.