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 The Brief History Of Aix, HP-UX, Solaris, BSD, And LINUX
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 Always remember that when doors close on you, other doors open. [Ken Thompson][1] and [Dennis Richie][2] are a great example for such saying. They were two of the best information technology specialists in the **20th** century as they created the **UNIX** system which is considered one the most influential and inspirational software that ever written.
 
 ### The UNIX systems beginning at Bell Labs ###