https://www.youtube.com/results?search_query=history+operation+system
https://www.youtube.com/watch?v=26QPDBe-NB8
https://www.youtube.com/watch?v=X9F3wkOLZvQ
https://www.youtube.com/watch?v=NTLwMgak3Fk
https://www.youtube.com/watch?v=CpRA0bGpO3M
https://www.youtube.com/watch?v=Hb3VtaHx6vw
https://www.youtube.com/watch?v=I8TpJ4oyuQI
https://www.youtube.com/watch?v=vjMZssWMweA
https://www.youtube.com/watch?v=26QPDBe-NB8
https://www.youtube.com/watch?v=Xpk67YzOn5w
https://pt.wikipedia.org/wiki/Fedora_Linux
https://pt.wikipedia.org/wiki/Red_Hat_Enterprise_Linux
https://pt.wikipedia.org/wiki/Slackware