KNIME Labs External Tool

I would like to run a command in an interactive shell (Ubuntu) that requires stdin input during execution.  Trying to follow the instructions in the Help manual does not seem to give me the anticipated results. 

The external tool asks several questions (i.e., input file name, tolerances, whether to write the results to an output).  The command runs nicely from a bash shell outside of KNIME, but I would like to be able to use it inside KNIME also...

Any suggestions?

Have you ever tried to execute a non-interactive OS command from inside a KNIME node? I wonder which node can do that, and where this option is described? Thanks in advance.

Please have look into the External Tool nodes which are available trough our update site. Those allow running external (non-interactive) commands from KNIME.