Use this command to add a relationship (relation_name)
between file_spec1 and file_spec2,
or to show the relationship with the specified data.
The relate command
supports the following subcommands:
Creating a relationship from one object to another
You can create a specified relationship from an object
to one or more destination objects, or from specified objects to a
single destination object. If you create a relationship that exists,
the operation succeeds although the command does nothing.
Showing relationships to and from an object
You can show relationships from an object to one or more
destination objects, or from specified objects to a single destination
object.