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https://issues.apache.org/jira/browse/HDFS-9125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14904676#comment-14904676
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Daniel Templeton commented on HDFS-9125:
----------------------------------------
I haven't applied the patch and tested it, but it appears to print something
like:
{code}
master:/home/nijel/hadoop-3.0.0-SNAPSHOT/bin # ./hdfs dfs -mkdirs
Usage: hdfs [OPTIONS] SUBCOMMAND [SUBCOMMAND OPTIONS]
...
SUBCOMMAND may print help when invoked w/o parameters or with -h.
-mkdirs: Unknown command
{code}
Perhaps it's a minor quibble, but shouldn't we print the error message before
the usage message?
> 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
> Attachments: HDFS-9125_1.patch
>
>
> {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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