What are the two major Unix system version?

Asked Jan 31, 2013
The UNIX developed at AT&T now V 5.4 and the Unix developed at U-Cal Berkley V BSD 4.4.

Answered Jan 31, 2013
Thanks Rob
regarding this question's answer you may also refer www.vtu.us this site . for Notes refer this sites. thank you.
Answered Apr 03, 2015

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.