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:
The Syntax is
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:
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
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
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
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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