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A comment on Ed(1) mastery is a must for a real Unix person. Parent comment
The "everything is a printer" abstraction started because PDP's that ran V7 Unix at Bell Labs really did use Teletypes for user interaction.
https://en.wikipedia.org/wiki/Teleprinter
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The "everything is a printer" abstraction started because PDP's that ran V7 Unix at Bell Labs really did use Teletypes for user interaction.
https://en.wikipedia.org/wiki/Teleprinter