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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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  • The Letter D | Alphabet A-Z | Jack Hartmann Lets Learn From A- Z . . .
    This Jack Hartmann's Alphabet A-Z series for the letter Dd Learn about the Letter d Learn that D is a consonant in the alphabet Learn to recognize the upp
  • DuPont de Nemours, Inc. (DD) - Yahoo Finance
    Find the latest DuPont de Nemours, Inc (DD) stock quote, history, news and other vital information to help you with your stock trading and investing
  • dd (Unix) - Wikipedia
    dd is 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 [1] The command can be used for many purposes
  • 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
  • What Does DD Mean in Text? - SlangSphere. com
    DD is often used as an abbreviation for ‘Dear Daughter’ or ‘Darling Daughter’ in a family context It is a term of endearment used by parents or guardians when addressing their daughters in written communication
  • Dungeons Dragons | The Official Home of D D
    Get the latest D D news, purchase official books, and use the D D Beyond toolset to create characters and run adventures with ease
  • DD - What does DD Stand For? - Acronyms and Slang
    What does DD mean? We know 500 definitions for DD abbreviation or acronym in 8 categories Possible DD meaning as an acronym, abbreviation, shorthand or slang term vary from category to category
  • DD - Definition by AcronymFinder
    218 definitions of DD Meaning of DD What does DD stand for? DD abbreviation Define DD at AcronymFinder com
  • DD - Dental and Aesthetic Supplies, Products and Services
    DD supplies over 12,000 dental practices in the UK with Dental and Aesthetic Supplies, Products and Services they need to run a successful practice





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