Execution of Knime Workflow Process through Terminal in Linux

Hi all, I want to call the Knime Workflow flow process from terminal in Linux and execute it. I have created one process on knime. And want to execute this process through terminal in Linux. Following are the screenshots of the steps I am doing.

I am not to able to understand what wrong I am doing. Please help me out.

I suggest you put your Workflow in a Workflow Group (Folder) and then reference that as your directory
A workflow itself is as the message hints, not a directory

Thanks Daniel for you input.
I did what you mentioned and put my workflow in Workflow Group (Folder) . And then when I am running the command I am getting: knime command not found.
Following are the screenshots.

Do I have to download some dependencies?
Please help me out.