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Command line call and exchange document in node

Question asked by fwtag on Sep 13, 2015
Hi there,

currently, I implement a workflow for an invoice process. At one point, I would like to call a (UNIX) system component, which OCRs the given node's document, and replaces the source document with the result.

My questions are:

1. How can I call a UNIX system component via command line and process the transformation?
2. How can I exchange the source document with the resulting document?

Thank you very much for your help.