UNIX is a popular multi-user, multitasking OS developed at Bell Labs in the early 1970s. Created by just a handful of programmers, UNIX was designed to be a small, flexible system used exclusively by programmers.

How to get and display the size of directories in Linux
Learn how to know the occupied space in the disk by directories and files.
How to compress a whole directory (including subdirectories) using TAR in Unix based OS with the CLI
Learn how to quickly compress an entire directory into a single tar file with the command line.