mkdir
To make a new directory, just execute the mkdir command with a list of new directory names to make as arguments:
mkdir hooray
and now a new directory called hooray exists.
You can create multiple directories at once:
mkdir one two
and now two new directories, one and two, exist.
mkdir -p
Suppose we want to make the following nested directory structure:
foo/
bar/
baz/
qrs/
Instead of doing:
mkdir foo foo/bar foo/bar/baz foo/bar/qrs
We can just do:
mkdir -p foo/bar/baz foo/bar/qrs
and the necessary parent directories foo/ and foo/bar/ will be created automatically.