Nice, I didn't know that one :-)
In the same vein, I was taught the story about 'dd' in school : the program makes a 'Carbon Copy' of a file. But 'cc' was already taken by the 'C Compiler'.
Not sure about the authenticity of the story, though.
Funny, I always thought it comes from data duplication and I never even checked...
It's the same thing I've heard from a "GOTO 2013" talk. Giving the history of unix naming, it's very likely this is what happened.
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