What is the use of the dd parameter

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Dd powerful backup command

Command format: dd parameter

The parameters are:

Number of bs=bytes: set both ibs (input) and obs (output) to the specified size

Number of cbs=bytes: block size converted for block and unblock

Conv= parameters: specific parameters are as follows:

Ascii-> convert ebcdic to ascii

Ebcdi-> convert ascii to ebcdi

Ibm-> convert ascii to another ebcdic

Block-> change the newline to the number of spaces set by the cbs parameter

Unblock-> replace the number of spaces set by the cbs parameter with a newline symbol

Lcase-> change uppercase letters to lowercase

Ucase-> change lowercase letters to uppercase

Swab-> swap the output characters in groups of two

Noerror-> ignore the error and proceed

Notrunc-> do not truncate the output file

Sync-> fill the data block with NULL to make it the same size as the ibs

Number of count= blocks: the number of blocks that read only the specified data

Number of ibs=bytes: number of bytes per read

If= files: reading from fil

Obs=bytes parameter: number of bytes per output

Of= files: exporting to fil

Number of seek= blocks: the number of blocks skipped at the start of output

Number of skip= blocks: the number of blocks skipped at the start of reading

-- help: displays help information

-- version: displays version information

An example: convert the test.txt file to the following letters and write it to the newtest.txt file:

Dd if=test.txt of=newtest.txt conv=ucase

For example, back up the entire / dev/sda1:

Dd if=/dev/sda1 of=/back/myback

If you want to back up MBR, then:

Dd if=/dev/sda of=/home/allinster/mymbr bs=512 count=1

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