hmkdir - create a new HFS directory
       hmkdir hfs-path [...]
       hmkdir  creates  new,  empty  directories  (folders) on the current HFS
       volume. There must not already be a file or directory with  each  named
       path.
       hfsutils(1), hrmdir(1), hcd(1), hpwd(1), hls(1)
       $HOME/.hcwd
       Robert Leslie <rob@mars.org>