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https://issues.apache.org/jira/browse/HADOOP-9693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745192#comment-13745192
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Steve Loughran commented on HADOOP-9693:
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Jayesh -where is it? I don't see it in trunk or 206-alpha 
[[https://github.com/apache/hadoop-common/blob/branch-2.0.6-alpha/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Shell.java]]

I see some check in {{org.apache.hadoop.fs.HardLink}}, which is something that 
should be moved to Shell, and as you say, moved to "OS X"
                
> Shell should add a probe for OSX
> --------------------------------
>
>                 Key: HADOOP-9693
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9693
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Steve Loughran
>            Priority: Trivial
>
> the {{Shell}} class looks for Windows and Linux and sets static fields to 
> show this. For tests, it's sometimes useful to know if a host is OS/X, as its 
> filesystem is different. Although this is easy to test in code 
> [https://developer.apple.com/library/mac/#technotes/tn2002/tn2110.html], 
> having this in one place makes it easier to maintain if future java versions 
> ever behave differently

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