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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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  • Home - dds DISCOUNTS®
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    Sip into Dunkin' and enjoy America's favorite coffee and baked goods chain View menu items, join Dunkin' Rewards, locate stores, and discover career opportunities
  • 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
  • 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’S DISCOUNTS - Updated May 2026 - 17 Photos 24 Reviews - Yelp
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  • Linux dd Command (17 Practical Examples) - phoenixNAP
    Learn essential Linux dd command options quickly with hands-on examples and unlock powerful data management capabilities
  • 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
  • The `dd` Command in Linux: A Comprehensive Guide
    The dd command (short for “disk duplicator” or “data duplicator”) is a powerful, low-level utility in Linux (and Unix-like systems) for copying and converting raw data It excels at tasks like disk imaging, cloning partitions, creating bootable media, and data recovery—often operating at the block level (e g , reading writing entire disk sectors) While deceptively simple, dd demands
  • dd (1) - Linux manual page - man7. org
    Sending a USR1 signal to a running 'dd' process makes it print I O statistics to standard error and then resume copying Options are: --help display this help and exit --version output version information and exit AUTHOR top Written by Paul Rubin, David MacKenzie, and Stuart Kemp REPORTING BUGS top Report bugs to: bug-coreutils@gnu org
  • dd Command in Linux: Explained - GeeksforGeeks
    Mastering the dd command is essential for Linux system administrators, as it enables precise control over data manipulation, backup processes, and disk recovery This guide will demonstrate how to use the dd command for disk cloning, data backup, and creating bootable media





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