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SSH, which encrypts and authenticates connections, had been in development since 1995, but it seemed to become adopted nearly universally and almost overnight around 2002. Key-based passwordless authentication makes it less cumbersome for other programs and scripts to piggyback atop SSH, since you won't have to re-enter your password each time. Key-based authentication exploits public-key cryptography to prove to the server that the client owns the secret private key without revealing the key.

SSH tricks

http://matt.might.net/articles/ssh-hacks/
https://plus.google.com/114424163811716070551/posts/bnLpsUq7rhd#114424163811716070551/posts/bnLpsUq7rhd Here is decades' worth of knowledge freely available online for those who love to learn. Links that fit under multiple categories are listed only once.

Johnathan Chung - Google+ - Over 200 Free Online Educational Resources (v.2.0) …

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About The Course A bold experiment in distributed education, "Introduction to Databases" is being offered free and online to students worldwide, October 10 - December 12, 2011. Students have access to lecture videos, are given assignments and exams, receive regular feedback on progress, and participate in a discussion forum. Those who successfully complete the course will receive a statement of accomplishment. http://www.db-class.org/

Introduction to Databases - Stanford University

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http://en.wikipedia.org/wiki/Elliott_Wave_Principle

Elliott Wave Principle - Wikipedia, the free encyclopedia

The Elliott Wave Principle is a form of technical analysis that some traders use to analyze financial market cycles and forecast market trends by identifying extremes in investor psychology, highs and lows in prices, and other collective factors. Ralph Nelson Elliott (1871–1948), a professional accountant, discovered the underlying social principles and developed the analytical tools in the 1930s. He proposed that market prices unfold in specific patterns, which practitioners today call Elliott waves, or simply waves. Elliott published his theory of market behavior in the book The Wave Principle in 1938, summarized it in a series of articles in Financial World magazine in 1939, and covered it most comprehensively in his final major work, Nature’s Laws: The Secret of the Universe in 1946.
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Khan Academy

http://www.khanacademy.org/ Matrices, vectors, vector spaces, transformations. Covers all topics in a first year college linear algebra course. This is an advanced course normally taken by science or engineering majors after taking at least two semesters of calculus (although calculus really isn't a prereq) so don't confuse this with regular high school algebra.
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Bona Fide OS Development Bran's Kernel Development Tutorial

http://www.osdever.net/bkerndev/
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Algorithms