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This question is ambiguous.

While UNIX is clearly defined, confusion occurs between dos and DOS.

DOS is the standard abbreviation for MS-DOS, the Microsoft disc operating system, while dos stands for disc operating system. Any disc operating system.

UNIX was written in1969; it clearly antedates MS-DOS by about 10 years.

The MULTICS dos was working in 1964, so it antedates UNIX.

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