BIND 10 #2848: b10-cmdctl-usermgr unhelpful output if command missing

[BIND 10 Development]

#2848: b10-cmdctl-usermgr unhelpful output if command missing
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            Reporter:  champion_xie  |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:
           Component:  cmd-ctl       |                   Resolution:
            Keywords:                |                 CVSS Scoring:
           Sensitive:  0             |              Defect Severity:  Low
         Sub-Project:  DNS           |  Feature Depending on Ticket:
Estimated Difficulty:  1             |          Add Hours to Ticket:  0
         Total Hours:  0             |                    Internal?:  0
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Comment (by thozza):

 I just used 'b10-cmdctl-usermgr' without any argument and realized that
 the output is not
 fully understandable from a user point of view.

 I agree with jelte that in such situation, the tool should print the
 usage, as for example
 'rndc' in BIND9 does.

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Ticket URL: <http://bind10.isc.org/ticket/2848#comment:3>
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