Refer to HELP <verb> for brief descriptions of the most
    commonly used NCL commands.  The commonly used verbs are:

       add and remove
       create and delete
       disable and enable
       set
       show

    These commands have the same effect on any entity to which
    they are applied.

    In addition to these NCL commands, there are a number of
    commands that apply only to specific entities; for example,
    the rename command for the Node entity, or the dump command
    for the Device Unit entity.