Node.js fs.filehandle.chown() Method
Last Updated : 28 Dec, 2022
The fs.filehandle.chown() method is an inbuilt application programming interface of class fs.filehandle within File System module which is used to change the ownership of the particular file.
Syntax:
const filehandle.chown(uid, gid)
Parameter: This method accept two parameters as mentioned above and described below:
- uid:: It represent the user id.
- gid: It represent group identifiers.
Return Value: This method returns a pending promise that contain no value in it.
Below programs illustrates the use of fs.filehandle.chown() method.
Example 1: Filename: index.js
javascript // Node.js program to demonstrate the // filehandle.chown() method const fs = require('fs'); const fsPromises = fs.promises; console.log("content of file before operation :- " + (fs.readFileSync('example.txt'))); // Initiating asynchronise function async function funct() { // Initializing filehandle let filehandle = null; try { // Creating and initiating filehandle filehandle = await fsPromises.open('example.txt', 'r+'); // Modifying the file ownership // by using chown() method const prom = filehandle.chown(1, 1); } finally { if (filehandle) { // Close the file if it is opened. console.log("ownership is changed" + " successfully"); console.log("content of file after" + " operation :- " + (fs.readFileSync('example.txt'))); await filehandle.close(); } } } funct().catch(console.error); Directory structure before running the program:
Directory structure after running the program:
Run index.js file using the following command:
node index.js
Output:
content of file before operation :- Content of example.txt file ownership is changed successfully content of file after operation :- Content of example.txt file
Example 2: Filename: index.js
javascript // Node.js program to demonstrate the // filehandle.chown() method const fs = require('fs'); const fsPromises = fs.promises; // Data for the new file let data = "This is a file containing " + "a collection of books."; // Name of the file to be created let file = "books.txt"; // Creating the new file 'books.txt' fs.writeFile(file, data, (err) => { // Catching error if (err) { console.log(err); } }); // Using fs.exists() method fs.exists(file, (exists) => { if (exists) { console.log("content of file" + " before operation :- " + (fs.readFileSync(file))); } }); // Initiating asynchronise function async function funct() { // Initializing filehandle let filehandle = null; try { // Creating and initiating // filehandle filehandle = await fsPromises.open(file, 'r+'); // Modifying the file ownership // by using chown() method const prom = filehandle.chown(1, 1); } finally { if (filehandle) { // Close the file if it is opened. console.log("ownership is changed"); console.log("content of file " + "after operation :- " + (fs.readFileSync(file))); await filehandle.close(); } } } funct().catch(console.error); Directory structure before running the program:
Directory structure after running the program:
Run index.js file using the following command:
node index.js
Output:
content of file before operation :- This is a file containing a collection of books. ownership is changed content of file after operation :- This is a file containing a collection of books.
Reference:
https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_filehandle_chown_uid_gid
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