All modern operating systems that we currently use have roots that go back to 1969 when Dennis Richie and Ken Thompson developed C programming language and Unix operating system at AT&T Bell Labs.
By 1975, AT&T started selling Unix operating system commercially.
In the 80s, companies such as IBM and Sun started to create their own Unix operating systems (AIX created by IBM and SunOS which later is Solaris by Sun) and that resulted in a miss of Unix dialects.
The first real root of Linux was when Richard Stallman ended the era of Unix separation by starting the GNU Project and his goal was to make an operating system that is completely free and available for everyone.
In the 90s, Linus Torvalds wrote a brand new kernel (POSIX) and he put the source code online.
Today, more than 97% of world supercomputers, 80% of smartphones, 70% of web servers, millions of desktop and laptop computers and internet modems run Linux.
Next article: Linux 101 - Current Linux Distributions
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