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https://issues.apache.org/jira/browse/HADOOP-4603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650257#action_12650257
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Kai Mosebach commented on HADOOP-4603:
--------------------------------------

Maybe its better to use the who command anyway, since it is present on Solaris, 
Linux, Darwin

i.e. 

# who -q | cut -f 1 -d " "| grep -v \# | head -1


> Installation on Solaris needs additional PATH setting
> -----------------------------------------------------
>
>                 Key: HADOOP-4603
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4603
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 0.18.2
>         Environment: Solaris 10 x86
>            Reporter: Jon Brisbin
>
> A default installation as outlined in the docs won't start on Solaris 10 x86. 
> The "whoami" utility is in path "/usr/ucb" on Solaris 10, which isn't in the 
> standard PATH environment variable unless the user has added that 
> specifically. The documentation should reflect this.
> Solaris 10 also seemed to throw NPEs if you didn't explicitly set the IP 
> address to bind the servers to. Simply overriding the IP address fixes the 
> problem.

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