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You can argue about which specific date is Linux's official birthday. Heck, even Linus Torvalds thinks there are four different dates in 1991 that might deserve the honor of being the operating system's birthday. Be that as it may, Linux is twenty years so let's take a walk though time with Linux at some of its high, and low, points.
1991: This message, sent back on August 25th 1991 to the Minix Usenet newsgroup, is usually seen at Linux's true birth. Little did Torvalds know just how wrong he'd be when he wrote, of his new free operating system that it would “just a hobby, won't be big and professional like gnu for 386(486) AT clones.”
1992: Andrew Tannenbaum, operating system guru and creator of Minix, an educational operating system version of Unix, declares “LINUX is obsolete” and Linux's first operating system war is on. In the resulting discussion, Torvalds makes a very telling comment about his vision for Linux which remains true today, “If the GNU kernel [another attempt to create a free Unix-like operating system] had been ready last spring, I'd not have bothered to even start my project: the fact is that it wasn't and still isn't. Linux wins heavily on points of being available now."