Arpit Agarwal created HDDS-438:
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Summary: 'ozone oz' should print usage when command or sub-command
is missing
Key: HDDS-438
URL: https://issues.apache.org/jira/browse/HDDS-438
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Components: Tools
Reporter: Arpit Agarwal
When invoked without the command or sub-command, _ozone oz_ prints the
following error:
{code:java}
$ ozone oz
Picked up _JAVA_OPTIONS: -Djava.awt.headless=true
Please select a subcommand
{code}
and
{code:java}
$ ozone oz volume
Picked up _JAVA_OPTIONS: -Djava.awt.headless=true
Please select a subcommand
{code}
For most familiar with Unix utilities it is obvious they should rerun the
command with _--help._ However we can just print the usage instead to avoid
guesswork
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