How To Use The DD Command in Linux

The dd command in Linux is a utility for copying and converting files and has many practical uses. In this video we go over a few of the most important ones.

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Commands used in this video

Wipe a drive
dd if=/dev/urandom of=/dev/sdb bs=1M conv=noerror
for n in `seq 7`; do dd if=/dev/urandom of=/dev/sdb bs=1M conv=notrunc,noerror; done

Backing up and restoring an entire disk or a partition
dd if=/dev/sdb of=/dev/sdc bs=1M conv=noerror

Creating a compressed disk image
dd if=/dev/sdb | gzip -c {right angle bracket} /tmp/testdisk.img.gz
dd if=/dev/sdb | gzip -c - | ssh user@local dd of=image.gz
gzip -dc /tmp/testdisk.img.gz | dd of=/dev/sdb

Create a bootable USB Drive
dd if=~/Downloads/linuxmint-20-xfce-64bit.iso of=/dev/sdb bs=1M

File carving
dd if=/dev/shm/test.txt of=/dev/shm/test2.txt skip=5 bs=1
dd if=/dev/shm/test.txt of=/dev/shm/test2.txt skip=5 bs=1 count=8