--- /dev/null
+ $ rbd map
+ rbd: image name was not specified
+ [1]
+ $ rbd unmap
+ rbd: device path was not specified
+ [1]
+ $ rbd clone foo@snap bar@snap
+ rbd: cannot clone to a snapshot
+ [1]
+ $ rbd cp foo
+ rbd: destination image name was not specified
+ [1]
+ $ rbd cp foo@bar
+ rbd: destination image name was not specified
+ [1]
+ $ rbd copy foo
+ rbd: destination image name was not specified
+ [1]
+ $ rbd copy foo@bar
+ rbd: destination image name was not specified
+ [1]
+ $ rbd mv foo
+ rbd: destination image name was not specified
+ [1]
+ $ rbd rename foo
+ rbd: destination image name was not specified
+ [1]
+ $ rbd clone foo@bar
+ rbd: destination image name was not specified
+ [1]
+ $ rbd clone foo
+ rbd: snap name was not specified
+ [1]