Use the io/ioutil.WriteFile function to write a string to a file and set file permissions and indentation format

Use the io/ioutil.WriteFile function to write a string to a file, and set the file permissions and indentation format

In the Go language, you can easily use the WriteFile function in the io/ioutil package to String written to file. At the same time, we can also set file permissions and indentation format to meet different needs.

The following is a sample code that demonstrates how to use the WriteFile function to write a file and set permissions and indentation format:

package main

import (
    "fmt"
    "io/ioutil"
    "os"
)

func main() {
    data := "Hello, World!"

    // 将字符串写入文件
    err := ioutil.WriteFile("example.txt", []byte(data), 0644)
    if err != nil {
        fmt.Println("写入文件失败：", err)
        return
    }

    // 设置文件权限为只读
    err = os.Chmod("example.txt", 0444)
    if err != nil {
        fmt.Println("设置文件权限失败：", err)
        return
    }

    // 读取文件
    content, err := ioutil.ReadFile("example.txt")
    if err != nil {
        fmt.Println("读取文件失败：", err)
        return
    }

    // 打印文件内容
    fmt.Println("文件内容：", string(content))
}

In the above code, we first define a string variable data , used to store the content to be written to the file. Then, we use the WriteFile function to write data to the file example.txt, and set the permissions to 0644, which means that the file owner has read and write permissions, and other users only have read permissions.

Next, we use the os.Chmod function to set the permissions of the example.txt file to 0444. This permission means that all users only have read permissions and no write permissions.

Finally, we use the ioutil.ReadFile function to read the contents of the example.txt file, and use the string function to convert it to a string, and finally print out the contents of the file.

Through the above sample code, we can easily use the io/ioutil.WriteFile function to write strings to files and set file permissions and indentation format. According to actual needs, we can flexibly modify the parameters in the code to meet different requirements.

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