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https://issues.apache.org/jira/browse/NIFI-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980826#comment-14980826
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Charlie Frasure commented on NIFI-1081:
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My properties of ExecuteStreamCommand are as follows:
Property: Value
Command Arguments: -b;--mime-encoding;${filename}
Command Path: file
Ignore STDIN: true
Working Directory: ${absolute.path}
Argument Delimiter: ;
Put stream output in attribute: true
Max size to put in attribute: 256
Attribute to put to: encoding
> Add option to ExecuteStreamCommand to put value of execution to an attribute
> ----------------------------------------------------------------------------
>
> Key: NIFI-1081
> URL: https://issues.apache.org/jira/browse/NIFI-1081
> Project: Apache NiFi
> Issue Type: Test
> Reporter: Joseph Percivall
> Assignee: Joseph Percivall
> Priority: Minor
> Attachments: NIFI-1081.patch
>
>
> This issue arose from a user on the mailing list. It demonstrates the need to
> be able to put the output of ExecuteStreamCommand to an attribute:
> I'm looking to process many files into common formats. The source files are
> coming in various character sets, mime types, and new line terminators.
> My thinking for a data flow was along these lines:
> GetFile (from many sub directories) ->
> ExecuteStreamCommand (file -i) ->
> ConvertCharacterSet (from previous command to utf8) ->
> ReplaceText (to change any \r\n into \n) ->
> PutFile (into a directory structure based on values found in the original
> file path and filename)
> Additional steps would be added for archiving a copy of the original,
> converting xml files, etc.
> Attempting to process these with Nifi leaves me confused as to how to process
> within the tool. If I want to ConvertCharacterSet, I have to know the input
> type. I setup a ExecuteStreamCommand to file -i
> ${absolute.path:append(${filename})} which returned the expected values. I
> don't see a way to turn these results into input for the processor, which
> doesn't accept expression language for that field.
> I also considered ConvertCSVToAvro as an interim step but notice the same
> issue. Any suggestions what this dataflow should look like?
> Bryan Bende's response:
> One problem with the above flow is that ExecuteStreamCommand will replace the
> contents of the FlowFile with the results of the command, so the FlowFIle
> will have the encoding value and no longer have the original content.
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