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https://issues.apache.org/jira/browse/HADOOP-3331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas resolved HADOOP-3331.
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Resolution: Duplicate
Duplicate of HADOOP-3792
> Return code for "hadoop dfs -test" does not match standard return codes from
> System.exit
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-3331
> URL: https://issues.apache.org/jira/browse/HADOOP-3331
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Environment: All
> Reporter: Mike Dillon
> Priority: Minor
>
> The output of "hadoop dfs -test" does the opposite of what normal Unix
> commands to (which is also the opposite of the recommended return codes in
> the javadocs for System.exit). Normal commands return zero for success and
> non-zero for error, but "hadoop dfs -test" does this opposite. This makes
> writing shell scripts that use "hadoop dfs -test" clunky and unnatural since
> you can't do standard stuff like this:
> {noformat}
> if hadoop dfs -test -e /missing/file/name; then
> # Do something only if the file exists
> else
> # Do something else if the file is missing
> fi
> {noformat}
> Creating a patch for this would introduce a breaking change and would require
> changing the Ant DFS task as well.
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