Implement the head command in the commands.js file. The head command outputs the first n lines of a file (you may decide what n is). This function will be similar to cat in structure so it will be helpful to reference.

Implement the tail command in the commands.js file. The tail command is the inverse of the head command. It outputs the last n lines of a file (you may decide what n is).

It is possible that a user will input a non-existent command to our bash shell. Within commands.js create an errorHandler function which will output an error message if the command cannot be found.

In this checkpoint, you encountered built-in JavaScript methods as well as the new ES6 syntax. Review the information below before attempting the programming challenge.