Unix for Advanced Users

15. Advanced Commands and Usage

15.1. dd

The dd command transfers raw data between devices. For example, dd can be used to create a boot floppy under linux using the following command:

dd if=boot.img of=/dev/fd0 bs=1440

where

if= is the input file or device
of= is the output file or device
bs= specifies the block size for both input and output files

ibs= input block size

obs= output block size