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DD    
数据字典

数据字典

DD
n 1: a doctor's degree in religion [synonym: {Doctor of Divinity},
{DD}]

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".

dd had a 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.

[{Jargon File}]

(2005-08-08)

Double Density [disks] (FDD)

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 inLet'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 DDDataset
Definitionspecification 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 Englishcopy’.


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  • Dental Office Toolkit
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