UNIX

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A multi-user, multitasking operating system originally developed at AT&T Bell Laboratories in 1969 for use on minicomputers. UNIX is available in several related forms, including AIX^R (a version of UNIX adapted by IBM to run on RISC-based workstations), A/UX^R (a graphical version of UNIX for the Apple Macintosh), and HU-UX^R (a version of UNIX adapted by HP).
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