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The Jargon File, version 4.4.8 (jargon)

dd: /dee·dee/, vt. [Unix: from IBM JCL] Equivalent to
cat or BLT. Originally the
name of 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(1)
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. The jargon usage is now
very rare outside Unix sites and now nearly obsolete even there, as
dd(1)
has been deprecated for a long time (though it has
no exact replacement). The term has been displaced by
BLT or simple English ‘copy’.

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單詞	字典	翻譯
dd	查看　dd　在Google字典中的解釋	Google英翻中〔查看〕
dd	查看　dd　在Yahoo字典中的解釋	Yahoo英翻中〔查看〕