connection to the AT&T code base. Most free/open-source implementations of the UNIX design, whether genetic UNIX or not, fall into the restricted definition of this third category due to the expense of obtaining Open Group certification, which costs thousands of dollars.

Dennis Ritchie, one of the original creators of Unix, mentioned Linux as one of the healthiest of the direct Unix derivatives due to its strong adherence to Unix principles.

Around 2001 Linux was given the opportunity to

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