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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 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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