nijel created HDFS-9125:
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Summary: Display help if the command option to "hdfs dfs " is not
valid
Key: HDFS-9125
URL: https://issues.apache.org/jira/browse/HDFS-9125
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: nijel
Assignee: nijel
Priority: Minor
{noformat}
master:/home/nijel/hadoop-3.0.0-SNAPSHOT/bin # ./hdfs dfs -mkdirs
-mkdirs: Unknown command
{noformat}
Better to display the help info.
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