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Can You Use Linux Without the Terminal? (How to Geek article)
(www.howtogeek.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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I don't think it's a theory rather than an objective fact. A lot of "traditional" computer skills have almost totally gone extinct because consumer devices are designed to hide as many system features from you as possible.
The saving grace is that even being raised without it, you end up needing these skills to become a developer of any decent calibre. That gives at least some route for these skills to transfer to new generations.