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tldr/pages/linux/dd.md
o0nd7ots a1c697bb1b
dd: update page (#12442) 
* Added status=progress

for base usage

* condensed knowledge

* Added info

* Changed one use

* improved wording

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Improved wording

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Improved wording

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Swap link from gnu to posix

Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

* Revert 4M to numeric

* moved `if` and `of` to be the last arguments

* Updated linux equivalent of dd

* Removed `status=progress` from common

* improved spacing

Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

* replaced 100 with placeholder

Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

* replaced 100 with description

last commit was actually also this

Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

* Removed bad space

* removed bad space

* removed newline at end of file

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>
2024-03-03 22:00:11 +01:00

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dd

Convert and copy a file. More information: https://www.gnu.org/software/coreutils/dd.

  • Make a bootable USB drive from an isohybrid file (such as archlinux-xxx.iso) and show the progress:

dd status=progress if={{path/to/file.iso}} of={{/dev/usb_drive}}

  • Clone a drive to another drive with 4 MiB block size and flush writes before the command terminates:

dd bs={{4M}} conv={{fsync}} if={{/dev/source_drive}} of={{/dev/dest_drive}}

  • Generate a file with a specific number of random bytes by using kernel random driver:

dd bs={{100}} count={{1}} if=/dev/urandom of={{path/to/random_file}}

  • Benchmark the write performance of a disk:

dd bs={{1M}} count={{1000000}} if=/dev/zero of={{path/to/file_1GB}}

  • Create a system backup and save it into an IMG file (can be restored later by swapping if and of):

dd if={{/dev/drive_device}} of={{path/to/file.img}}

  • Check the progress of an ongoing dd operation (run this command from another shell):

kill -USR1 $(pgrep -x dd)