mkdir

Allows users to create new directories. With mkdir, you can also set permissions, create multiple folders at once, and much more.

Make multiple directories. Add -v option for verbose output:

mkdir {test1,test2,test3}

Building a structure with multiple subdirectories requires adding the -p option:

mkdir -p parent/{child1,child2}

The mkdir command by default gives 755 permissions - or the umask setting 022.
To create a folder with 700 permissions:

mkdir -m700 directory