Quickly learn to use Go language to modify hosts file

Before learning to use Go language to modify the hosts file, you first need to understand what a hosts file is. The Hosts file is a text file on your computer that is used to resolve domain names into IP addresses so that we can access a website or server through the domain name. Modifying the hosts file can meet some network debugging or custom domain name resolution needs.

Next, we will introduce how to use Go language to quickly modify the hosts file. In Go language, we can read and write files through the os package and io/ioutil package. The following is a sample code for adding a custom domain name resolution to the hosts file:

package main

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

func main() {
    hostPath := "/etc/hosts" // hosts文件路径，Windows系统可能会有不同的路径
    customEntry := "127.0.0.1 example.com" // 自定义的域名解析，格式为IP地址 域名

    // 打开hosts文件，以追加模式打开
    file, err := os.OpenFile(hostPath, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
    if err != nil {
        fmt.Println("无法打开hosts文件:", err)
        return
    }
    defer file.Close()

    // 写入自定义的域名解析条目
    _, err = file.WriteString(customEntry + "
")
    if err != nil {
        fmt.Println("写入失败:", err)
        return
    }

    fmt.Println("成功添加自定义域名解析:", customEntry)
}

In the above code, we first define the path to the hosts file and the custom domain name resolution entry to be added. . Then we use the os.OpenFile function to open the hosts file in append mode, and then write the customized domain name resolution entries to the file through the file.WriteString method. Finally, we print out the message that the custom domain name resolution was successfully added.

It should be noted that this code is applicable under Linux system. If it is run on Windows system, the path and format of the hosts file may be different and need to be adjusted according to the actual situation.

Through this code example, you can quickly learn how to use Go language to modify the hosts file. Hope this article helps you!

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