UNIX, now in its 43rd year of existence, has proven itself a durable, reliable OS that has been widely adopted for many purposes. Responsible in large measure for the integrity and popularity of UNIX is the Single UNIX Specification, a standard of The Open Group. This, according to Andrew Josey, Director of Standards at The Open Group, ensures compatibility across all platforms by providing a level of openness and enabling applications written to the standard to be easily moved across a wide range of platforms because the standard establishes a baseline of core functionality above which suppliers can innovate.
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