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dd – copy blocks of data


dd [ [if= file ] | [ din= disknum bin= blocknum ] ] [ [of= file ] | [ dout= disknum bout= blocknum ] ] count= number_of_blocks


dd copies the specified number of blocks from source to destination. Source and destination may be specified as either a file that is a fully qualified pathname, or as a starting block on a disk. The parameter disknum may range from zero to the maximum number reported by sysconfig -r. In the latter form of specifying source or destination, both disknum and blocknum must be specified. If the source is missing, input is taken from standard input; if the destination is missing, output is sent to standard output. If the number of blocks exceeds the size of the file, copying stops upon reaching EOF.



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