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Date: Fri, 22 Feb 2013 18:38:14 +0000 (UTC)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12630071.1359602956985.324629.1361558294725@arcas>
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Subject: [jira] [Updated] (HADOOP-9267) hadoop -help, -h, --help should show
 usage instructions
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     [ https://issues.apache.org/jira/browse/HADOOP-9267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron T. Myers updated HADOOP-9267:
-----------------------------------

          Resolution: Fixed
       Fix Version/s: 2.0.4-beta
    Target Version/s: 2.0.4-beta
        Hadoop Flags: Reviewed
              Status: Resolved  (was: Patch Available)

I've just committed this to trunk and branch-2.

Thanks a lot for the contribution, Andrew.
                
> 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
>             Fix For: 2.0.4-beta
>
>         Attachments: hadoop-9267-1.patch, hadoop-9267-2.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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