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https://issues.apache.org/jira/browse/HADOOP-8010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198015#comment-13198015
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Roman Shaposhnik commented on HADOOP-8010:
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@Matt, thank a lot for committing it!

@Eli, the difference between hadoop-config.sh and everything else is that 
hadoop-config.sh doesn't control which scripts are sourcing it (it is meant to 
be sourced not executed) and thus needs to be as POSIX compliant as possible. 
The rest of the scripts where '==' is used in Hadoop 1.0 branch are all 
specifying #!/usr/bin/env bash so there's no issue.
                
> hadoop-config.sh spews error message when HADOOP_HOME_WARN_SUPPRESS is set to 
> true and HADOOP_HOME is present
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8010
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8010
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 1.0.0
>            Reporter: Roman Shaposhnik
>            Assignee: Roman Shaposhnik
>            Priority: Minor
>             Fix For: 1.0.1
>
>         Attachments: HADOOP-8010.patch.txt
>
>
> Running hadoop daemon commands when HADOOP_HOME_WARN_SUPPRESS is set to true 
> and HADOOP_HOME is present produces:
> {noformat}
>   [: 76: true: unexpected operator
> {noformat}

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