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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9267) hadoop -help, -h, --help should show usage instructions
Date Thu, 31 Jan 2013 21:33:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568129#comment-13568129
] 

Chris Nauroth commented on HADOOP-9267:
---------------------------------------

Hi, Andrew.  The changes look good.  Would you want to do the same thing for hadoop-yarn-project/hadoop-yarn/bin/yarn?
                
> hadoop -help, -h, --help should show usage instructions
> -------------------------------------------------------
>
>                 Key: HADOOP-9267
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9267
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>            Priority: Minor
>         Attachments: hadoop-9267-1.patch
>
>
> It's not friendly for new users when the command line scripts don't show usage instructions
when passed the defacto Unix usage flags. Imagine this sequence of commands:
> {noformat}
> -> % hadoop --help
> Error: No command named `--help' was found. Perhaps you meant `hadoop -help'
> -> % hadoop -help
> Error: No command named `-help' was found. Perhaps you meant `hadoop help'
> -> % hadoop help
> Exception in thread "main" java.lang.NoClassDefFoundError: help
> Caused by: java.lang.ClassNotFoundException: help
> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> Could not find the main class: help.  Program will exit.
> {noformat}
> Same applies for the `hdfs` script.

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