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1 definition found From The Jargon File (version 4.4.7, 29 Dec 2003) [jargon]: 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?.