What does the
-p flag do in
-p flag will create nested directories, but only if they don't exist already.
For example, suppose you have a directory
/foo that you have write permissions for.
mkdir -p /foo/bar/baz # creates bar and baz within bar under existing /foo
It is also an idempotent operation, because if you run the same command over again, you will not get an error, but nothing will be created.