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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), English - Vietnamese)
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A Unix copy command with special options suitable for
block-oriented devices; it was often used in heavy-handed
system maintenance, as in "Let's "dd" the root partition
onto a tape, then use the boot PROM to load it back on to a
new disk".
The Unix "dd" was designed with a weird, distinctly non-Unixy
keyword option syntax reminiscent of IBM System/360 JCL
(which had an elaborate DD "Dataset Definition" specification
for I/O devices); though the command filled a need, the
interface design was clearly a prank.