JavaScript/Node/Bash implementation

Everything has been fine through classes, inheritance, etc. but reaching the section on NODE/use of command-line with virtual BASH console is really not working at all! I will read more for Node.js, but for now, I am not sure if the command-line is not working because I have not installed node yet. I will include the specific command line notation for BASH:

node message-mixer.js [‘caesar’|‘symbol’|‘reverse’] [amount]