Node.js fs.filehandle.utimes() Method
The fs.filehandle.utimes() method is an inbuilt application programming interface of class fs.filehandle within File System module which is used to change the time stamp of this file system.
Syntax:
const filehandle.utimes(atime, mtime)
Parameter: This method accepts two parameters as mentioned above and described below:
- atime: Access timestamp is the last time the file was read.
- mtime: Modified timestamp signifies the last time the contents of a file were modified.
Return Value: This method returns an pending promise which contains no value in it.
Below programs illustrates the use of fs.filehandle.utimes() method in Node.js:
Example 1: Filename: index.js
Javascript
// Node.js program to demonstrate the // filehandle.utimes() method const fs = require( 'fs' ); const fsPromises = fs.promises; console.log( "content of the file before operation :- " + fs.readFileSync( 'example.txt' , 'utf8' )); // File cTime before operation fs.stat( 'example.txt' , (err, stats) => { if (err) throw err; console.log( "CTime of the file before operation: " + stats.ctime); }); // Initiating asynchronise function async function funct() { // Initializing following variables let filehandle = null ; let prom = null ; try { // Creating and initiating filehandle filehandle = await fsPromises.open( 'example.txt' , 'r+' ); // Changing the timestamp of the file // by using utimes() method prom = filehandle.utimes(0, 10); } finally { if (filehandle) { // File cTime after operation (filehandle.stat( true )) .then( function (result) { console.log( "CTime of the file " + "after operation :- " + result.ctime); }) console.log( "content of the file " + "after operation : " + fs.readFileSync( 'example.txt' , 'utf8' )); // Close the file if it is opened. 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 the file before operation : Content of example.txt file
CTime of the file before operation: Tue Jul 07 2020 09:21:11 GMT+0530 (India Standard Time)
content of the file after operation : Content of example.txt file
CTime of the file after operation :- Tue Jul 07 2020 09:53:15 GMT+0530 (India Standard Time)
Example 2: Filename: index.js
Javascript
// Node.js program to demonstrate the // filehandle.utimes() 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))); } }); // File cTime before operation fs.stat(file, (err, stats) => { if (err) throw err; console.log( "CTime of the file before operation: " + stats.ctime); }); // Initiating asynchronise function async function funct() { // Initializing filehandle let filehandle = null ; try { // Creating and initiating filehandle filehandle = await fsPromises.open(file, 'r+' ); // Changing the timestamp of the file // by using utimes() method prom = filehandle.utimes(0, 20); } finally { if (filehandle) { // Close the file if it is opened. // file cTime after operation (filehandle.stat( true )) .then( function (result) { console.log( "CTime of the file " + "after operation :- " + result.ctime); }) 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.
CTime of the file before operation: Tue Jul 07 2020 09:56:52 GMT+0530 (India Standard Time)
content of file after operation: This is a file containing a collection of books.
CTime of the file after operation: Tue Jul 07 2020 09:57:09 GMT+0530 (India Standard Time)
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_filehandle_utimes_atime_mtime
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