In this tutorial, we are going to explain the “du” command used on every Linux distribution such as Ubuntu, Debian, or CentOS.“Du” stands for Disk Usage and every Linux user should use it very often to check the amount of disk space used by directory or file. Using the “du” command is very simple by typing it on the console and adding additional phrases called options. In other words, the “du” command is different every time, according to the needs of the user and what the user wants to be displayed as output.

Source: LXer – How to Use the Du Command in Linux