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Mac OS X is based on UNIX.
Unix is a specification. Mac OS X is a certified implementation of Unix. This like asking "What is the difference between a turtle and a red-eared slider."
Windows, Unix, Mac OS
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=
The reason for the exec functions being same/similar is because the Mac OS has its roots in variants of the Unix kernel.
Yes Mac OS is based on Linux
Mac OS X is pronounced Mac OS Ten. It follows on from Mac OS 9 which was the last version of what is now known as the classic Mac OS and it saw the introduction of the new UNIX based OS so the Roman numeral X was adopted to mark the change.
Mac OS X is an operating system running a UNIX shell, unlike Windows which uses a DOS shell. Most software must be specifically designed for use on Mac OS X because of its different shell, though UNIX provides Mac with improved security.
Dos Unix Linux Windows Mac OS OS/2
Solaris, Mac OS X, HP-UX, and IRIX are all examples of Unix systems.
No, the Registry is a feature of Microsoft Windows only. Neither the original Mac OS or the newer Mac OS X have ever used a Registry, Mac OS X is based on Unix which has never used a Registry.
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=