DD (Unix)

DD (Unix)

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data. dd is an application that will "convert and copy a file" according to the referenced manual page for Version 7 Unix and is most likely inspired from DD found in IBM JCL, and the command's syntax is meant to be reminiscent of this; in JCL, "DD" stands for Data Description. dd is used to copy a specified number of bytes or blocks, performing on-the-fly byte order conversions, as well as more esoteric EBCDIC to ASCII conversions. dd can also be used to copy regions of raw device files, e.g. backing up the boot sector of a hard disk, or to read fixed amounts of data from special files like /dev/zero or /dev/random. It is jokingly said to stand for "disk destroyer," "data destroyer," or "delete data," since, being used for low-level operations on hard disks, a small mistake, such as reversing the if and of parameters, can possibly result in the loss of some or all data on a disk.
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Product details

  • Paperback | 132 pages
  • 152 x 229 x 8mm | 204g
  • United States
  • English
  • 6136530120
  • 9786136530123