Solution: lb_head

Here is the commented solution for this project.

Create the script

Within the projects directory, let's create a new file named lb_head.js.

$ touch lb_head.js

Handle command-line arguments

The objective of this part is to define a code block responsible for defining and parsing the command-line flags and positional arguments of the script.

Setup a try...catch block

Let's declare a try...catch block responsible for catching and logging any error that may be thrown during the parsing phase, and immediately terminate the process with an exit code of 1 indicating that something went wrong.

try {  // Script logic goes here...} catch(error) {  console.error(error.toString());  process.exit(1);}

Define CLI flags

Let's use the parseArgs() function exported by the core node:util module to define the --help, --bytes, and --lines flags.