code: public DataSink<T> printOnTaskManager(String prefix) {
  		return output(new PrintingOutputFormat<T>(prefix, false));
  	}
docs: Writes a DataSet to the standard output streams (stdout) of the TaskManagers that execute
  the program (or more specifically, the data sink operators). On a typical cluster setup, the
  data will appear in the TaskManagers' <i>.out</i> files.
  
  <p>To print the data to the console or stdout stream of the client process instead, use the
  {@link #print()} method.
  
  <p>For each element of the DataSet the result of {@link Object#toString()} is written.
  
  @param prefix The string to prefix each line of the output with. This helps identifying outputs
  from different printing sinks.
  @return The DataSink operator that writes the DataSet.
  
  @see #print()