cbstats difference from 4.1 to 4.5

My bucket is called "b2"

$ /opt/couchbase/bin/cbstats localhost:11210 -b b2 uuid

 uuid: 79aa90955824b223bdddf6f7429ce751

This command on my system returns nothing,

$ /opt/couchbase/bin/cbstats localhost:11210 uuid

It fails silently if you do not specify the bucket name.

If you specify a bucket that does not exist, you will get an Authentication error.

$ /opt/couchbase/bin/cbstats localhost:11210 -b nonexistintbucket uuid

Authentication error for nonexistintbucket

If you do not specify a bucket, but ask for all, you can get some generic stats

$ /opt/couchbase/bin/cbstats localhost:11210 all | grep version

 memcached_version:              3333fbc2a5f27cd03d95e68b19599c38f657b14b

 version:                        4.5.0-2601

According to the documentation, it should not fail, as this is the way to request uuid:
http://developer.couchbase.com/documentation/server/4.5/cli/cbstats/cbstats-uuid.html
Request syntax:
cbstats [host]:11210 uuid
Bucket name is not a documented parameter.