"How do I make directory under Linux operating systems using the command prompt or bash shell?"
You need to use the mkdir command to create new folders or directories under Linux operating systems. A directory (also known as folder in MS-Windows/OS X) is nothing but a container for other directories and files.
mkdir command Syntax
The mkdir command has the following syntax:
mkdir dirname OR mkdir dirname1 dirname2 OR mkdir [option] dieNameHere OR mkdir -p dir1/dir2/dir3
Open a terminal and use the mkdir command to create empty directories. The following command would create a directory called foo:
$ mkdir foo