Set the mode of created directories to mode, which
may be symbolic as in chmod(1) and then uses the default mode as
the point of departure.
Make any missing parent directories for each
directory argument. The mode for parent directories is set to the
umask modified by `u+wx'. Ignore arguments corresponding to existing
directories. (Thus, if a directory /a exists, then `mkdir /a' is an error,
but `mkdir -p /a' is not.)
Print a message for each created directory. This is most
useful with --parents.