In this article, we are going to discuss the
dd command. The
dd command stands for data duplicator. It is mainly used for converting and copying files. In this section, we are going to learn about backing up and erasing a media file.
Besides having a terminal open, we need to make sure you have the necessary files present in the current directory to take backups, to make copies, and similar tasks.
How to do it
dd command is mainly used for converting and copying files. The
if parameter stands for input-file and is a source.
of stands for output-file and is a source where we want to paste data.
Run the following command to copy the contents of one file to another:
# create a file 01.txt and add some content in that file. # create another file 02.txt and add some content in that file. $ dd if=/home/student/work/01.txt of=/home/student/work/02.txt bs=512 count=1
Run the following command to take a backup of the partition or the hard disk:
$ sudo dd if=/dev/sda2 of=/home/student/hdbackup.img
dd command is also used to erase all of the contents of the disk. Run the following command to delete the contents:
$ sudo dd if=/home/student/work/1.sh
How it works
Now we will see how the preceding commands work:
- We used the
ddcommand to copy the contents of the
01.txtfile into the
- To run this command, we must have super user privileges. Using the
ddcommand, we took a backup and stored it in the
- Using the
ddcommand, we erased the contents of the