dd Linux Commands

What is Linux dd Command?

Explanation

dd COMMAND:

dd command is used to dump the data. The data in a file or device or partition can be dumped to another file or device or partition. This command is also used for creating bootable devices.

SYNTAX :


dd [options]

OPTIONS:


-if Specifies the input device or partition (or) file from which data is to be dumped
-of Specifies the output device or partition (or) file to which data is to be dumped
-ibs Specifies how many bytes is to be readed from a input file at a time during the dumping process
-obs Specifies how many bytes is to be written to the output file at a time during the dumping process
-bs Specifies how many bytes is to be readed and written at a time during the dumping process
-count=[bytes] Specifies how many bytes is to be dumped from 'if' to 'of'

EXAMPLE:


  1. To create bootable floppy :
    dd if=diskboot.img of=/dev/fd0

    This command creates the bootable floppy.
    In above command:
    diskboot.img-Is the bootable image
    /dev/fd0-Is a floppy disk
  2. To import the data from one hard-disk to another hard-disk:
    dd if=/dev/sda of=/dev/sdb

    In above command:
    /dev/sda-Is the hard-disk from which data is dumped
    /dev/sdb-Is the hard-disk to which data is dumped
  3. To import the data from one partition to another partition:
    dd if=/dev/sda1 of=/dev/sda2

    /dev/sda1-Is the partition from which data is dumped
    /dev/sda2-Is the partition to which data in /dev/sda1 is dumped
  4. To Specify number of bytes readed and written at a time during dumping:
    dd if=/dev/sda1 of=/dev/sda2 bs=2100

    The above command will dump data from /dev/sda1 to /dev/sda2 by reading and writing 2100 bytes at a time.

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