Node.js | fs. fchownSync() Method
The fs.fchownSync() method is used to synchronously change the owner and group of the given file descriptor. The function accepts a user id and group id that can be used to set the respective owner and group. It does not return anything.
Syntax:
fs.fchownSync( fd, uid, gid )
Parameters: This method accepts three parameters as mentioned above and described below:
- fd: It is an integer that denotes the file descriptor of the file of which the owner and group has to be changed.
- uid: It is a number that denotes the user id that corresponds to the owner to be set.
- gid: It is a number that denotes the group id that corresponds to the group to be set.
Below examples illustrate the fs.fchownSync() method in Node.js:
Example 1: This example shows the setting of the owner.
// Node.js program to demonstrate the // fs.fchownSync() method // Import the filesystem module const fs = require( 'fs' ); // Get the file descriptor for the file let fd = fs.openSync( "example_file.txt" , "r" ); // Set the owner to a new one keeping the group same // New owner is "w3wiki" with user id 1010 // The old group is "xubuntu" with group id 999 fs.fchownSync(fd, 1010, 999); console.log( "uid and gid set successfully" ); |
Before Running the Code:
xubuntu@xubuntu: ~/Desktop/fs-fchownSync$ ls -l total 8 -rw-rw--w- 1 xubuntu xubuntu 4 Apr 22 09:10 example_file.txt -rw-rw-r-- 1 xubuntu xubuntu 290 Apr 22 09:15 index.js
Output of the Code:
Given uid and gid set successfully
After Running the Code:
xubuntu@xubuntu: ~/Desktop/fs-fchownSync$ ls -l total 8 -rw-rw--w- 1 w3wiki xubuntu 4 Apr 22 09:10 example_file.txt -rw-rw-r-- 1 xubuntu xubuntu 290 Apr 22 09:15 index.js
Example 2: This example shows the setting of the group.
// Node.js program to demonstrate the // fs.fchownSync() method // Import the filesystem module const fs = require( 'fs' ); // Get the file descriptor for the file let fd = fs.openSync( "example_file.txt" , "r" ); // Set the group to a new one keeping the owner same // The old owner is "xubuntu" with user id 999 // New group is "author" with group id 1015 fs.fchownSync(fd, 999, 1015); console.log( "uid and gid set successfully" ); |
Before Running the Code:
xubuntu@xubuntu: ~/Desktop/fs-fchownSync$ ls -l total 8 -rw-rw--w- 1 xubuntu xubuntu 4 Apr 22 09:10 example_file.txt -rw-rw-r-- 1 xubuntu xubuntu 290 Apr 22 09:15 index.js
Output of the Code:
Given uid and gid set successfully
After Running the Code:
xubuntu@xubuntu: ~/Desktop/fs-fchownSync$ ls -l total 8 -rw-rw--w- 1 xubuntu author 4 Apr 22 09:10 example_file.txt -rw-rw-r-- 1 xubuntu xubuntu 290 Apr 22 09:15 index.js
Reference: https://nodejs.org/api/fs.html#fs_fs_fchownsync_fd_uid_gid
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