mkdir man document

mkdir - make directories

mkdir [ options ] directory ...

mkdir creates one or more directories. By default, the mode of created directories is a=rwx minus the bits set in the umask(1).

-m, --mode=mode: Set the mode of created directories to mode. mode is symbolic or octal mode as in chmod(1). Relative modes assume an initial mode of a=rwx.
-p, --parents: Create any missing intermediate pathname components. For each dir operand that does not name an existing directory, effects equivalent to those caused by the following command shall occur: mkdir -p -m $(umask -S),u+wx $(dirname dir) && mkdir [-m mode] dir where the -m mode option represents that option supplied to the original invocation of mkdir, if any. Each dir operand that names an existing directory shall be ignored without error.
-v, --verbose: Print a message on the standard error for each created directory.

0: All directories created successfully, or the -p option was specified and all the specified directories now exist.
>0: An error occurred.