Node.js fs.chown()方法
fs.chown()方法用于异步更改给定路径的所有者和组。该功能接受用户 id 和组 id，可用于设置各自的所有者和组。它有一个回调函数，如果函数失败，它会返回任何可能出现的错误。
语法:
fs.chown( path, uid, gid, callback )
参数:这个方法接受上面提到的和下面描述的四个参数:
- Path: It is a string, Buffer or URL that indicates the path of the file that the owner and group must change.
- uid: is a number representing the user id corresponding to the owner to be set.
- Gid: is a number representing the group ID corresponding to the group to be set.
- Callback: is a function that will be called when the method is executed.
- err: If the method fails, this error will be thrown.
下面的例子说明了 Node.js 中的 fs.chown()方法:
示例 1: 本示例显示了所有者的设置。
// Node.js program to demonstrate the
// fs.chown() method
// Import the filesystem module
const fs = require('fs');
let filepath = "example_file.txt";
// Set the owner to a new one keeping the group same
// New owner is "geeksforgeeks" with user id 1541
fs.chown(filepath, 1541, 999, (error) => {
if (error)
console.log("Error Code:", error);
else
console.log("uid and gid set successfully");
});
运行代码前:
xubuntu@xubuntu: ~/Desktop/fs-chown$ ls -l
total 8
-rw-rw--w- 1 xubuntu xubuntu 4 Apr 25 04:08 example_file.txt
-rw-rw-r-- 1 xubuntu xubuntu 290 Apr 25 04:08 index.js
代码输出:
Given uid and gid set successfully
运行代码后:
xubuntu@xubuntu: ~/Desktop/fs-chown$ ls -l
total 8
-rw-rw--w- 1 geeksforgeeks xubuntu 4 Apr 25 04:08 example_file.txt
-rw-rw-r-- 1 xubuntu xubuntu 290 Apr 25 04:08 index.js
示例 2: 此示例显示了组的设置。
// Node.js program to demonstrate the
// fs.chown() method
// Import the filesystem module
const fs = require('fs');
let filepath = "example_file.txt";
// Set the owner and group both to a new one
// New owner is "sam" with owner id 1500
// New group is "author" with group id 1021
fs.chown(filepath, 1500, 1021, (error) => {
if (error)
console.log("Error Code:", error);
else
console.log("uid and gid set successfully");
});
运行代码前:
xubuntu@xubuntu: ~/Desktop/fs-chown$ ls -l
total 8
-rw-rw--w- 1 xubuntu xubuntu 4 Apr 25 04:09 example_file.txt
-rw-rw-r-- 1 xubuntu xubuntu 290 Apr 25 04:09 index.js
代码输出:
Given uid and gid set successfully
运行代码后:
xubuntu@xubuntu: ~/Desktop/fs-chown$ ls -l
total 8
-rw-rw--w- 1 sam author 4 Apr 25 04:09 example_file.txt
-rw-rw-r-- 1 xubuntu xubuntu 290 Apr 25 04:09 index.js
参考:T2【https://nodejs . org/API/fs . html # fs _ fs _ chown _ path _ uid _ GID _ callback
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