Github user nchammas commented on the pull request:

    https://github.com/apache/spark/pull/3916#issuecomment-77954145
  
    Sorry to spam the PR with comments about Bash word splitting, @vanzin. I 
think what you have Bash-wise looks good, but as a matter of consistency I just 
went through and marked the places where Bash word splitting bugs are 
theoretically possible.
    
    As a habit, I think we should always quote Bash output (whether of 
variables, subshell, etc.), though I can see if in some cases you feel it would 
be unnecessary.


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