Monday, September 7, 2009

Linux - dd Command

dd is an abbreviation for "dataset definition". Its primary purpose is the low-level copying and conversion of raw data.

dd can also be used to copy regions of raw device files or to read fixed amounts of data from special files like /dev/zero or /dev/urandom.

/dev/zero - a special file that provides as many null characters

/dev/urandom - a special file that serves as a true random number generator or as a pseudorandom number generator.

Example use of dd command

1. Create an ISO Disk Image from a CD-ROM:

dd if=/dev/cdrom of=/home/myhome/my.iso bs=2048 conv=sync,notrunc

2. Destroy data on a partition with null data

#Do not execute this code on any computer unless you want to destroy all data on a partition! 

dd if=/dev/zero of=/dev/

3. duplicate one hard disk partition to another hard disk

dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=notrunc,noerror

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