# Building a Tiny CLI Tool — Node.js

Source: https://www.geekswithgeeks.com/en/nodejs/node-cli-tool

> Combine argv, fs, and a shebang into a runnable command-line tool.

## A word-count CLI

Read a file named on the command line and report its word count.

```javascript
#!/usr/bin/env node
import { readFile } from "node:fs/promises";

const filePath = process.argv[2];
if (!filePath) {
  console.error("Usage: wordcount <file>");
  process.exit(1);
}

const text = await readFile(filePath, "utf8");
const words = text.trim().split(/\s+/).length;
console.log(`${filePath}: ${words} words`);
```

Output:

```
notes.txt: 42 words
```

## Making it executable

The `#!/usr/bin/env node` shebang lets the OS run the file directly, without typing `node` first.

```bash
chmod +x wordcount.js
./wordcount.js notes.txt
```