Responses to a Hadley tweet:
Is there an equivalent to https://t.co/erZb80L9YY for learning basic (bash) shell commands? (For someone who has never used shell before)
— Hadley Wickham (@hadleywickham) December 3, 2014
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The thing Hadley was pointing at https://try.github.io/
Erin Ledell suggested http://explainshell.com
Karl Broman suggested http://web.mit.edu/mprat/Public/web/Terminus/Web/main.html
Ramnath Vaidyanathan and Alyssa Frazee suggested http://www.learnshell.org