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https://issues.apache.org/jira/browse/PIG-2499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197155#comment-13197155
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Tom White commented on PIG-2499:
--------------------------------

I wonder if {{touch TouchedFileInsideGrunt_61 | ls}} is causing a race, we 
should probably change it to {{touch TouchedFileInsideGrunt_61 && ls}} for 
safety's sake anyway.

PIG-2206 was reporting this test as failing too. I don't think it's Mac 
specific as I have seen this failure on Linux too.
                
> Pig TestGrunt.testShellCommand occasionally fails
> -------------------------------------------------
>
>                 Key: PIG-2499
>                 URL: https://issues.apache.org/jira/browse/PIG-2499
>             Project: Pig
>          Issue Type: Bug
>          Components: build
>            Reporter: Tom White
>
> The following code fails from time to time (with a NPE since 
> {{fileReader.readLine()}} returns null) :
> {noformat}
>             strCmd = "sh bash -c 'touch TouchedFileInsideGrunt_61 | ls | grep 
> TouchedFileInsideGrunt_61 > fileContainingTouchedFileInsideGruntShell_71'";
>             cmd = new ByteArrayInputStream(strCmd.getBytes());
>             reader = new InputStreamReader(cmd);
>             grunt = new Grunt(new BufferedReader(reader), context);
>             grunt.exec();
>             fileReader = new BufferedReader(new 
> FileReader("fileContainingTouchedFileInsideGruntShell_71"));
>             
> assertTrue(fileReader.readLine().equals("TouchedFileInsideGrunt_61"));
> {noformat}

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