mkdir(1) will create a new directory. You simply specify the directory to create when you run mkdir. This example creates the hejaz directory in the current directory:
$ mkdir hejaz |
You can also specify a path, like this:
$ mkdir /usr/local/hejaz |
The -p option will tell mkdir to make any parent directories. The above example will fail if /usr/local does not exist. The -p option will create /usr/local and /usr/local/hejaz:
$ mkdir -p /usr/local/hejaz |