Computer terminals
 
Livin' the pseudoterminal life!
(Image of a real DEC VT100 at the Living Computer Museum by Jason Scott. (wikimedia.org))
I’ve got more to say here. Possible topics:
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Portability 
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The madness of terminfo 
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CLI philosophy 
Related:
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tmux, the terminal multiplexer. 
Oh, and if you’ve never seen a real teleprinter in action (or APL, for that matter), check out this wonderful video:
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APL demonstration 1975 (youtube.com) by Professor Bob Spence, Imperial College London. 
External Links
This massive single-page Console Desktop Guide contains a wonderful amount of console/terminal information across Unix-likes such as Linux distros and BSDs. It covers everything from configuring a basic console setup to tips/tricks/hacks/scripts and fun modern terminal applications to try. I love it: