For "command path" you probably want something like: "/usr/bin/python3.6" or "/usr/bin/python3" You can find the exact path to Python by issuing "which python3" from a shell. It may vary between distributions. When you execute a script through NiFi it doesn't have the environment variables set like a regular user with shell access might. One of these very important environment variables is PATH, which includes the location of /bin and /usr/bin , so when you type "python" at a shell, it knows where to look for whatever "python" is if it's not found in the current directory. ... View more