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Slackware wasn't the first Linux distro, but it's the oldest still alive and kicking
(www.theregister.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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What do you mean by the cost? Because you didn't want to wipe out your Windows OS? I've been running distros on my personal PC for 23 years now. Can't say I've ever spent money on it except for some cheap CDs. I think I even got distro cds for cheap that came with linux magazines.
I assume the cost was of Unix and not Linux.
If you wanted to run actual Unix, there was a significant licensing fee. That's one of the reasons Linux took off, because it did all the same things but was free.
Aaaah I understand.