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From: Doug McIlroy <doug@cs.dartmouth.edu>
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Subject: Re: [TUHS] PDP-7 UNIX file systam
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> As noted in the jargon file, the dd(1) syntax is deliberately reminiscent
> of the DD statement in IBM JCL.  This was presumably a joke

That is certainly true and reflects its major early usage to
prepare tapes to carry to other systems.

 Though I haven't use dit in ages, I recall that the joke was
so fully engtained that the command was more likely to be
written "dd  ifile=x ofile=y" than "dd <x >y"

Doug