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Node.js CLI 3

For sophisticated CLI applications, consider using a framework like oclif or gluegun. These provide structure, testing utilities, and advanced features like command grouping and plugins.

Example using commander:​

#!/usr/bin/env node

const { program } = require('commander');

program
  .version('1.0.0')
  .description('A CLI for greeting users')
  .option('-n, --name <name>', 'name to greet', 'World')
  .option('-u, --uppercase', 'convert greeting to uppercase')
  .action((options) => {
    let greeting = `Hello, ${options.name}!`;
    if (options.uppercase) {
      greeting = greeting.toUpperCase();
    }
    console.log(greeting);
  });

program.parse(process.argv);

This creates a more feature-rich CLI with options and flags. Install commander with npm install commander, then run the script with various options like node advanced-greet.js -n Alice -u.