Introduction to file-type-cli

The file-type-cli is a powerful command-line tool for identifying file types by their header
signatures (often called magic numbers). It’s based on the
file-type
library and provides quick and accurate results. This tool is perfect for developers, system administrators, and anyone
who frequently works with various file formats.

Installation

npm install -g file-type-cli

Basic Usage

To identify a file type, simply run the following command:

file-type-cli 

Examples of API Usage

Here are some useful APIs provided by file-type-cli:

1. Detecting the File Type from a Path

  
    file-type-cli ./example.png
  

2. Detecting the File Type from a URL

  
    curl -sL  | file-type-cli
  

3. Detecting the File Type from STDIN

  
    cat example.jpg | file-type-cli
  

4. Outputting in JSON Format

  
    file-type-cli ./example.pdf --json
  

5. Specifying Multiple Files

  
    file-type-cli file1.jpg file2.png file3.mp4
  

Example Application Using file-type-cli

Let’s build a small application that uses file-type-cli to detect file types and upload them:

Setup

First, create a Node.js project:

  
    mkdir file-type-app
    cd file-type-app
    npm init -y
    npm install file-type
  

Code Implementation

  
    const fs = require('fs');
    const fileType = require('file-type');
    const { exec } = require('child_process');

    const filePaths = ['./example1.jpg', './example2.png'];

    async function detectFileType(filePath) {
      const buffer = fs.readFileSync(filePath);
      const type = await fileType.fromBuffer(buffer);
      console.log(`${filePath} is of type ${type.ext}`);
    }

    filePaths.forEach(detectFileType);

    // Alternatively, use file-type-cli
    exec(`file-type-cli ${filePaths.join(' ')}`, (error, stdout, stderr) => {
      if (error) throw error;
      if (stderr) console.error(`stderr: ${stderr}`);
      console.log(`stdout: ${stdout}`);
    });
  

In this script, we use both file-type library and file-type-cli to detect the file types of the given files.

Conclusion

The file-type-cli is an invaluable tool for anyone needing to identify file formats quickly and efficiently. The simplicity and speed of this CLI tool make it an excellent choice for developers and system administrators alike.

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