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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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  • dd (Unix) - Wikipedia
    dd (Data (set) Definition) is a shell command for reading, writing and converting file data Originally developed for Unix, it has been implemented on many other environments including Unix-like operating systems, Windows, Plan 9 and Inferno
  • DD Stock Price Quote | Morningstar
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  • DD - What does DD stand for? The Free Dictionary
    Looking for online definition of DD or what DD stands for? DD is listed in the World's most authoritative dictionary of abbreviations and acronyms
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    This page illustrates how DD is used in messaging and chat forums, in addition to social networking software like VK, Instagram, Whatsapp, and Snapchat From the table above, you can view all meanings of DD: some are educational terms, the other are medical terms, and even computer terms
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  • DuPont de Nemours (DD) Stock Price Overview
    A detailed overview of DuPont de Nemours, Inc (DD) stock, including real-time price, chart, key statistics, news, and more
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  • What does DD stand for? - Abbreviations. com
    Looking for the definition of DD? Find out what is the full meaning of DD on Abbreviations com! 'Dolby Digital' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource





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