Mount Point /- for NFS

In Sample /etc/auto_master File, the mount point /- tells autofs not to associate the entries in auto_direct with any specific mount point. Indirect maps use mount points that are defined in the auto_master file. Direct maps use mount points that are specified in the named map. Note that, in a direct map the key, or mount point, is a full path name.

An NIS auto_master file can have only one direct map entry because the mount point must be a unique value in the name space. An auto_master file that is a local file can have any number of direct map entries if entries are not duplicated.