mkdir: mkdir [-p] [-m mode] directory [directory ...]
    Create directories.
    
    Make directories.  Create the directories named as arguments, in
    the order specified, using mode rwxrwxrwx as modified by the current
    umask (see `help umask').  The -m option causes the file permission
    bits of the final directory to be MODE.  The MODE argument may be
    an octal number or a symbolic mode like that used by chmod(1).  If
    a symbolic mode is used, the operations are interpreted relative to
    an initial mode of "a=rwx".  The -p option causes any required
    intermediate directories in PATH to be created.  The directories
    are created with permission bits of rwxrwxrwx as modified by the current
    umask, plus write and search permissions for the owner.  mkdir
    returns 0 if the directories are created successfully, and non-zero
    if an error occurs.