This comprehensive Linux guide expects that you run the following commands as root user but if you decide to run the commands as a different user then ensure that the user has sudo access and that you precede each of the privileged commands with sudo

Given a device or disk-image, partx tries to parse the partition table and list its contents. It optionally adds or removes partitions. The disk argument is optional when a partition argument is provided.

It is a very useful utility to tell the Linux kernel about the presence and numbering of on-disk partitions. In this tutorial, we will show you multiple ways to use the partx command with examples.

Displaying Partition Table Of A Disk

You can run the following command to display the partition table of a disk.

root@codesposts:~$ partx --show /dev/sda10

You can replace the sda10 with the specific node you want.

Displaying All Sub-Partitons on /dev/sda

If you want to display all the sub-partitions on /dev/sda, you can run the command like below 

root@codesposts:~$ partx --show /dev/sda

Specifying The Range Of Partitions

If you want to specify the range of the partitions to be displayed in the output, you can use the option --nr. And you can also use the option -o to define the output columns.

Example:

root@codesposts:~$ partx -o START, END --nr 10 /dev/sda

Reading The Disk And Adding All Partitions To The System

If you want to read a disk and add all the partitions to the system, you can run the command like below:

root@codesposts:~$ partx -v -a /dev/sdb

Displaying The Length In Sectors

If you want to display the length of partition 3 on /dev/sdb in sectors, run the command like below:

root@codesposts:~$ partx -o SECTORS,SIZE  /dev/sdb3 /dev/sdb

Adding The Specified Partitions

If you want to add the specified partitions, you can run the command like below:

root@codesposts:~$ partx -a --nr 2:6 /dev/sdb

This will add the partitions 4-6 inclusive on /dev/sdb

Removing A Partition

To remove a partition from the system, you can run the following command:

root@codesposts~:$ partx -d --nr :-1 /dev/sdd

This will remove the last partition on /dev/sdd

Disabling The Header In The Output

To disable the header in the output, run the command like below:

root@codesposts:~$ partx -o START -g --nr 8 /dev/sdb